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Патент USA US3098534

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July 23, 1963
3,098,524
C. C. BROWN
METHODS OF AND APPARATUS FOR COMPLETING MULTIPLE ZONE WELLS
Filed April 16, 1958
6 Sheets-Sheet 1
11'
INVENTOR
13;?911 F5. mm
July 23, 1963
c. c. BROWN
3,098,524
METHODS OF AND APPARATUS FOR COMPLETING MULTIPLE ZONE WELLS
Filed April 16y 1958
6 Sheets-Sheet 2
C/cero C. Brown
INVENTOR
ATTORNEY)‘
July 23, 1963
C. C. BROWN
3,098,524
METHODS OF AND APPARATUS FOR COMPLETING MULTIPLE ZONE WELLS
Filed April 16, 1958
6 Sheets-Sheet 3
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C/cero C. 5/0 vv?
INVENTOR
July 23, 1963
3,098,524
C. C. BROWN
METHODS OF‘ AND APPARATUS FOR COMPLETING MULTIPLE ZONE WELLS
Filed April 16. 1958
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July 23, 1963
c. 0. BROWN
3,098,524
METHODS OF AND APPARATUS FOR COMPLETING MULTIPLE ZONE WELLS
Filed April 16. 1958
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C/cero
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INVENTOR
ATTORNEY
July 23, 1963
C. C. BROWN
3,098,524
METHODS OF AND APPARATUS FOR COMPLETING MULTIPLE ZONE WELLS
Filed April 16, 1958
K
e Sheets-Sheet- s
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United States Patent 0
1
1
Patented July 23, 1963
2
METHODS OF AND APPARATUS FUR COM
PLETING MULTWLE ZONE WELLS
Cicero C. Brown, Houston, Tex., assignor to Brown (Bil
Tools, Inc, Houston, Tex” a corporation of Texas
A particular object of the invention is to provide a
well apparatus of the character described, wherein the
packing element of each well packer is deformed into a
set position by an endwise compressive force and also
wherein each packer is so arranged that the force applied
Filed Apr. 16, 1958, Ser. No. 728,967
15 Claims. (Cl. 166-48)
to the production string on which the element is mounted,
3,9§8,524
to the packing element to set the same is not transmitted
This invention relates to new and useful improvements
whereby stretching of said string during setting of the
packer is avoided.
in methods [of and apparatus for completing multiple
The construction designed to carry out the invention
zone wells.
will be hereinafter described, together with other features
The invention disclosed herein is an improvement on
thereof.
the method and apparatus illustrated in my co-pending
The invention will be more readily understood from
application, Serial No. 659,197, ?led April 26, 1957, now
a reading of the following speci?cation and by reference
15 to the accompanying drawings forming a part thereof,
Patent No. 2,991,833.
It is one object of this invention to provide an im
wherein an example of the invention is shown, and
proved method and apparatus for completing multiple
wherein:
zone wells, wherein ‘a plurality of well tubing strings may
FIGURE 1 is a schematic view illustrating the lower
be landed in ?nal position in the well head equipment
most packer being moved downwardly within the well
prior to the setting of the Well packers which seal off 20 bore;
between said formations and also wherein the well pack
FIGURE 2 is a schematic view showing the intermedi
ers are hydraulically-actuated and are of the type in
ate and upper packers mounted on the ?rst tubing string
which the packing element thereof is moved into sealing
and also showing a portion of the second tubing string
position by the [application of an endwise force to said
connecting the intermediate and upper packers and illus
25 trating continued lowering of the apparatus within the
element.
An important object is to provide an improved well
well bore;
apparatus including a plurality of hydraulically-actuated
FIGURE 3 is a view similar to FIGURES 1 and 2 with
packers mounted upon a ?rst production string, together
the three packers in substantially ?nal elevation within
with additional production strings extending to and
the well bore;
through certain of the packers to conduct well ?uids 30
FIGURE 4 is a similar View showing the remaining
from the various production zones which ‘are separated
portion of the second tubing string and the third tubing
by the packers, said packers being settable by pressure
string in position and ‘also schematically illustrating all
applied thereto from one or more of the production
three strings in ?nal landed position in the control head
strings and being releasable by manipulation of the ?rst
production string, whereby unsetting [and removal of all
packers may be accomplished solely by means of said
?rst production string.
Another object of the invention is to provide :an im
proved method of lowering a plurality of well packers
35
equipment;
FIGURE 5A is a view partly in section and partly
in elevation of the upper end of the ‘well bore showing
the three tubing strings landed in ?nal position in the
control head equipment; for the sake of clarity, the three
production strings are shown as arranged in transverse
and production strings into a well bore wherein a ?rst
‘alignment although in actual practice said strings will be
production string, a portion of the second string and a
disposed at various radial points with respect to the axial
trio of well packers are lowered simultaneously into
center of the well bore;
position into the well bore, after which the remaining
FIGURE 5B is a continuation of FIGURE 5A show
portion of the second string and a third production string 45 ing the structural details of the upper packer;
are lowered and connected with the uppermost packer to
FIGURE 5C is a continuation of FIGURE 5B show
establish the desired communication with the various pro
ing the details of the connections between the upper
ducing formations.
packer and the intermediate packer;
Still another object of the invention is to provide an
FIGURE 5D is a continuation of FIGURE 5C showing
improved well apparatus having hydnaulically-actuated 50 the ‘structural details of the intermediate packer;
packers for sealing off between production zones, which
FIGURE SE is a continuation of FIGURE 5D illus
zones communicate with their respective production tub
trating the connection between the intermediate packer
ing strings; the apparatus including means whereby the
and the lower packer;
packers may be selectively set and properly tested by the
FIGURE SP is a continuation of FIGURE 5B show
application of pressure through the various strings, there 55 ing the structural details of the lower packer;
by assuring that proper sealing has been accomplished
FIGURE 5G is a continuation of FIGURE 5F show
before the well is ?nally put on production.
ing the lower extension of the ?rst tubing string;
Still another object is to provide an apparatus of the
FIGURE 6 is a horizontal cross-sectional view taken
character described in which each packer, after being
on the line 6—-—6 of FIGURE 5B;
set, is maintained in set position .without the necessity 60
FIGURE 7 is a horizontal cross-sectional view taken
of holding pressure within the respective production
on‘ the line 7-7 of FIGURE 5B;
strings, release of the pressure acting to maintain the
FIGURE 8 is an enlarged cross-sectional view of the
packers in set position being effected by manipulation of
check valve assembly;
only one of the production strings.
FIGURE 9‘ is an isometric view of the clutch element
A further object is to provide a well apparatus of the 65 which connects each piston of the packer assembly with
the tubing string;
character described in which safety joint connections are
properly positioned between the spaced packers so that
FIGURE 10 is an enlarged sectional view of the re
in the event that the packers can not be removed in a
trievable closure plug which may be employed to close
normal manner by the manipulation of one of the produc
?ow through the tubing strings, and
tion strings, 1a disconnection may be made thereby permit 70
FIGURE 11 is a horizontal cross-sectional view taken
ting subsequent removal of the packers by any other
on‘ the line 11—11 of FIGURE 5B.
well-known means.
In the drawings (FIGURES l to 4), the numeral 10’
3,098,524t
4
designates a well bore having the usual well casing ex
tending therethrough. The well bore is illustrated as
make the connection between sections TZ-a and T2~b
traversing an upper producing formation or zone P1, a
. second or intermediate producing formation or zone P2,
and a third or lower producing formation or zone P3.
The casing is formed with the usual perforations 12 0p
gether, not only by the ?rst tubing string T1, but also by
the coupled sections TZ-a and T2-b of the second tubing
be explained, all three tubing strings, T1, T2 and T3,
having the packers connected and sealing therewith in
be effected downwardly through the ?rst tubing string
so that, in effect, the packers B and C are connected to
string T2, which coupled sections form a tubular con
iductor extending between packers B and C.
posite each producing zone whereby the well ?uids from
Thereafter, this portion of the assembly is lowered as
that zone may enter the bore of the casing.
shown in FIGURE 3 and lowering is continued until the
‘In order to produce the well ?uids from each zone or
packers A, B and C are located at their proper elevations
formation independently of the other zones or forma 10 with respect to the producing formations or zones P1, P2
tions, it is necessary to seal or pack off each zone from
and P3, At this time the packers are not set and are not
the others and to establish communication between each
in sealing engagement with the well casing 11.
isolated zone and its respective production string or well
Thereafter, the upper section T2-c of the second tub-_
tubing. FIGURE 4 illustrates a lower packer A posi
ing string T2 is lowered within the well bore and is
tioned between the lower and intermediate zones, a sec 15 coupled to the upper packer C and, as will be explained,
ond packer B located between the intermediate and
such coupling establishes connnunication with the tubu
the upper zones, and a third packer C located above the
lar conductors formed by the sections TZ-a and TZ-b of
upper zone. A ?rst production or tubing string T1 ex
the string T2. Following this the third tubing string T3
tends from the surface through all three packers, A, B
is run into the Well independently of the other strings and
and C, and as will hereinafter appear, communicates with
is coupled or connected to the uppermost packer C. All
the lowermost zone or formation P3 to conduct the -well
three strings, T1, T2 and T3, are then landed in the con
?uids ‘from this formation to the surface. A second pro
trol equipment in their ?nal position and the well is then
duction or tubing string T2 extends from the area below
completely under control. However, at this point the
the intermediate packer B, then upwardly through the
packers A, B and C are not in sealing engagement with
upper packer C and to the surface. A third production 25 the well casing. This position of the parts of the appara
or tubing string T3 extends from the area below the
tus is illustrated in FIGURE 4.
upper packer C and upwardly to the surface. As will
It will be evident that at this time a circulation may
T1 and such circulation will pass upwardly around the
the manner hereinafter described, are landed in the con 30 lowermost packer A and may return upwardly through
trol head equipment schematically illustrated in FIGURE
4 and designated by the letter D. As shown in FIGURE
4, ?nal landing of the strings in the control head equip.
ment is made prior to the time that the packers A, B
tubing T2; or a portion of the return may be through
the llhlf'vd tubing string T3 since the circulation may pass
around the outside of the unset packer B. The control
head equipment D includes the usual outlet 14 from the
and C are moved into a set or sealing position‘ within 35 casing, which is controlled by valve 15 and, if desired,
the wall of the well casing. Thus, after landing of the
three strings, it is possible to circulate through any one
or all of the strings and a free circulation around all
this valve may be opened so that circulation may be
downwardly through one or more of the tubing strings
T1, T2 or T3 with returns being conducted from the cas
packer-s may be accomplished. Thereafter, by means of
ing through outlet 114. Similarly, if desired, circulation
hydraulic pressure, the packers A, B and C may be moved 40 can be in a reverse direction. It is, therefore, possible to
into sealing or set position, such pressure being applied
carry out any desired washing or circulating step with all
through the bore or bores of the tubing strings. When
tuhings in place, ?nally landed in the control head and
the packers move into sealing or set position, they func
prior to the time that any of the packers are set.
tion to isolate the producing formations from each other
As will be explained, the packers are constructed to be
and at that time the lowermost formation or zone P3 45 set by hydraulic pressure which is applied through one
is produced through the ?rst tubing string T1 and the
or more of the tubing strings. By dropping a closure
?uids from the intermediate formation or zone P2 are
plug, generally indicated at E in FIGURE 4, Within the
produced through the tubing string T2 and the fluids
?rst tubing string T1 a pressure may be built up within the
from the upper formation or zone P1 ?ow to the surface
tubing string and, as will be explained, such pressure may
50 be utilized to set all three of the packers A, B and C.
through tubing string T3.
The present invention involves a novel method of low
If the plug E ‘is dropped into the second tubing string T2,
ering and ?nally setting the packers as well as an im
pressuring up in tubing T2 may function to set the inter~
proved method of removing said packers when such re
mediate packer B and the upper packer C. If it is de
moval becomes necessary and FIGURES 1 to 4 illustrate
sired to set only the upper packer C, the plug E may
the manner in‘ which said packers and strings are posi 55 be dropped within tubing T3 and pressure ‘applied through
tioned Within the well bore. Referring to FIGURE 1,
this tubing will set the uppermost packer. The appara
the lower packer A is connected to or mounted upon the
tus is thus extremely versatile and the particular packer
lower portion of the ?rst string T1 and is lowered within
or packers which are set and the order in which they are
the well by means of said tubing string a predetermined
set is subject to the particular well conditions. The ar
distance and lowering is halted when the packer B is to 60 rangement also makes it possible to set the packer and
be connected. The distance between packers A and B is
then test the same to be certain that it is in sealing en
in accordance with the location and extent of the pro
gagement with the well casing.
ducing zones P3 and P2. Packer B is then connected to
For example, plug E may be lowered in tubing T3 and
or mounted upon the ?rst tubing string T1, this being
pressure applied to set the upper packer C. Then by
accomplished at the well surface and lowering is then
circulating downwardly through tubing T1 and upwardly
continued. Thereafter, a tubular conductor or section
around packers A and B with return through tubing T2,
T2—a of the second tubing string (FIGURE 2) is run into
it is possible to test to be sure that the packer C has
the well and connected to packer B. Packer C is then
been properly set. This circulation may also accomplish
mounted upon or connected to the ?rst tubing string T1
a washing operation which clears the bore below the sec
in the manner illustrated in FIGURE 2, and at this time 70 ond packer of mud and washes the face of the producing
another section T2-b of the second tubing string T2 is
formations. If the plug E is removed from the tubing
connected in place. The section TZ-b has its upper end
T3 after the upper packer C is set, then downward cir
coupled to the lower end of packer C with its lower end
culation through tubing T3 and return through tubing
secured to a union coupling 13, which may be just be
T1 accomplishes a washing of that portion of the well
neath the upper packer. The union is employed to 75 bore below the upper packer C. Thereafter, packer B
3,098,524
5
6
may be set by dropping a plug through the second tub
ing string ‘I72. A pressure test from above packer B may
bore of the mandrel 25 forming a continuation of the
bore 24. Surrounding the mandrel 25 and disposed be
low the body 23 is an elastic packing element 26 having
and a test below said packer may be effected by circulat
con?ning rings 27 and 28 engaged with its upper and
ing downwardly through the ?rst tubing string T1. 5 lower ends. Below the elastic packing element and also
mounted on the mandrel 25 is a slip expander cone 29
Thereafter, the lower packer A may be set, and by
proper application of pressure through tubing T2 or tub
having an outer tapered surface ‘30. The cone 29 is nor
be made by circulating downwardly through tubing T3
ing T1,
packer may :be tested for sealing e?iciency.
mallysupported on a ring or shoulder 31 secured to the
After all of the packers are set, the plugs E are, of
exterior of the mandrel 25.
course, removed and ?ow from each producing forma 10
Adapted to co-act with the expander cone 29‘ are a
tion is conducted to the surface through its respective
tubing string.
As will be explained, release and unsetting of the
packers and removal thereof may be eifected by a ma
plurality of gripping slips 32 which are mounted for
radial movement in an outward direction when the cone
and slips are moved with respect to each other. The
lower end of each slip is formed with a T-shaped lug 3G
nipulation of the ?rst tubing string Tl. This is one of 15 engaged in a complementary recess 34- formed in the up
the features of the invention since all three packer-s may
per end of a cylinder member 35. The cylinder member
be released simultaneously and removed from the well
surrounds the lower portion of the tubular section or
bore by the single production string. In such case the
mandrel 25 and has ‘a head 36 at its upper end. The cyl_
upper section T2-C of the second production string T2 and
inder encircles a piston body 37 which, in turn, is at—
the third production string T3 are ?rst removed after 20 tached to the lower end of the tubular mandrel 25. An
which the ?rst string T1 is manipulated and removed. If,
angular ?uid passage 38 having a back-check valve 39 is
for some reason, simultaneous release ‘and removal of all
formed in the piston and the lower end of the passage
three packers can not be effected by the ?rst string, the
communicates with the space between the tubing T1 and
apparatus is so arranged in the well that the upper packer
the bore of the piston 37. The tubing T1 is provided
may ?rst be released ‘and then by means of a safety 25 with a radial port 40‘ and when ?uid pressure is applied
joint F below said ?rst packer, a disconnection of the
to the interior of the tubing T1, such pressure may pass
upper packer and upper section of the ?rst tubing from
the check valve ‘39 and may enter the space indicated at
the remainder of said ?rst string and the lower packers
41 between the upper end of the piston and the lower
may be accomplished. Thereafter, a suitable overshot or
surface of the head 36 of the cylinder upwardly with re
similar tool may be engaged with that portion of string 30 spect to the piston and with respect to the tubular man
T1 still remaining in the Well to remove the intermediate
drel 25 as well as the parts carried by such mandrel.
packer .B and the lowermost packer A. If both of these
The cylinder is slidable axially on the piston 37 and a
packers will not release on the same operation, another
shear pin 1'44 normally connects the cylinder to the pis
safety joint G is provided between packers B and A so
ton until a predetermined pressure is applied between the
that another section of string T1 and packer B may be
piston and the cylinder.
independently removed. Thereafter the ?nal section B
The slips, piston and cylinder are normally in the posi
of string T1 with the lower packer may be removed.
tion shown in FIGURE 5B, but when pressure is ap
Although the particular construction of the individual
plied beneath the head 36 of the cylinder, the pin 144 is
packers is subject to variation, insofar as the method of
sheared and the piston is moved upwardly. Since the
running, completing, setting of the packers and subse 40 slips 32 are connected with the cylinder and since the ex
quently removing said packers is concerned, it is pre
pander cone is carried by the support 25, which is sta
ferred to employ hydraulically-actuated well packers, each
tionary at this time, the slips are moved upwardly into
of which have .an elastic packing element which is de
grip-ping engagement with the wall of the casing. As
formable into sealing position by endwise compression
soon as the slips engage, further upward movement of
or force. This type of packer is distinguished from the 45 the cylinder is halted and the pressure within the space
so-called “balloon type” wherein pressure is applied to
between head '36 of the cylinder and the piston will react
the interior of the element. The drawings illustrate the
in a downward direction against the piston. When this
preferred type of well packers.
occurs, the piston 37 will be moved downwardly relative
FIGURES 5A to 5G illlustrate the complete apparatus
to
the cylinder, slips and expander cone and through the
?rom control head equipment D to the lower end of the 50 tubular support will apply downward force to the upper
well bore and it is noted that the three tubing strings are
body 23. Such downward ‘force will apply a downward
shown as in transverse ‘alignment; however, in actual
pressure upon the upper end of the elastic packing element
practice the strings would not be in such alignment and
26 and will effect a distortion of said elastic packing ele
are shown in this manner for illustrative purposes only.
ment into‘ sealing engagement with the wall of the well
55
Actually, the three strings are spaced at various radial
casing. Due to the back-check valve, the pressure will
positions with respect to the axis of the well bore as
be trapped between the piston and the head 36 of the
shown in FIGURE 7.
cylinder and will retain the packing element and slips in
Referring to FIGURE 5A, this ‘?gure illustrates the
set position even though pressure within the tubing string
three tubing strings T1, T2 and T3‘ suspended from a tub
T1 is relieved.
ing head 20 which forms part of the control head equip 60
In order to release the pressure so that the packing ele
ment D. Each tubing string has a suitable control valve
ment and slips may be released, the tubing T1 is ‘rotated,
21 connected therein whereby flow through each string
as will be explained, and is moved upwardly with respect
may be controlled. The valved outlet 14 is mounted in
to the various parts of the packer C assembly. Such up
the body portion 22 of the tubing head. The tubing head
ward movement will locate the port or opening 4% in the
is, of course, supported on the upper end of the well 65 tubing T1 opposite a relief port 44 which extends
casing 11.
through the tubular support 25 opposite the upper end
The ?rst tubing string T1 extends downwardly through
of piston 67. Registration of ports 40 and 44 will allow
all three packers C, B and A and the other two strings
the pressure, which is trapped between the piston and the
T2 and T3‘ have connection with the uppermost packer C
head 36 of the cylinder, to be relieved through the in
as is illustrated in FIGURE 5B. The packer C includes 70 terior of the tubing string T-l so that the slips may be re
a main body 23‘ having an axial bore 24 extending com
turned to their original position with respect to the ex
letely therethrough and the ?rst tubing string T1 extends
pander cone and applied pressure to the packing element
entirely through this bore. A tubular mandrel or pipe
26 will be relieved. At the same time that port \40 is
section 25 has its upper end connected to the lower end
moved into registration with port 44 a reduced portion
75
of the bore 24 and extends downwardly therefrom, the
45 on the exterior of tubing T1 will span the packing
3,098,524
8
member'46 which normally seals off around the tubing
T1 to allow a bypass of ?uid around this packing so that
pressures across the unit may be equalized. The regis
tration of ports 40 and 44, together with the c'o-acti‘on of
the reduced portion 45 with the packing member 46, pro
vide a release means for effecting a release of the set
packing element 26 and the gripping slips 32 to thereby
release the packer C from set position.
In addition to the bore 24-, which is provided in the
with such arrangement, the hydraulic pressure which im
parts the downward movement to the piston 37 and
mandrel 25 and upper body 23 will not result in stretch
ing the tubing. Also, the co-operating parts of the cou
pling may function as a jar, as will be explained.
The coupling 59 is illustrated in detail in FIGURE 9
and includes an upper body section 70 having a threaded
pin '71 which connects to the tubular extension 60 depend
ing from the piston 37. The body has ?nger portions 72
upper body ‘23 of the upper packer C, said body is formed 10 which telescope upstanding ?ngers 73 of a lower section
with a second bore 47 which receives the lower end of
74. The ?ngers are normally in the position shown in
the section T2—c of the second tubing string. The lower
FIGURE 9 and are extended with respect to each other,
end of this section of the second string is formed with a
being held so by shear pins 75. The bore of the lower
J -slot coupling 48 which co-acts with a connecting pin 49
section 74 has the internal threads 61 which couple
formed within the bore 4-7. Thus, the upper section T2-c 15 to the tubing T1 and below said threads are additional
of the second tubing string is detachably or releasably
rcomse coupling threads 77 which subsequently co-act with
connected with the upper packer C.
coarse coupling threads 78 of a coupling 79, the latter
A continuation of bore '47 entirely through the packer
C is provided by a tubular pipesection 50‘ which extends
being also carried by tubing T1.
In the operation of the special coupling 59 the initial
through aligned openings in the elastic packing element 20 application of pressure to the area between the piston
26, the expander 29‘, head 36 of cylinder 35 and the pis
37 and the cylinder head 36 will result in an upward
ton 37.
The upper body 23 of the packer C is also formed
with a third bore 51 which is adapted to receive the lower
movement of the cylinder to set the slips 30. Then the
reactive force is in a down direction which would tend to
move the piston 37 downwardly as above explained. This
end of the third tubing string T3. This third tubing string 25 results in shearing the pins 75 of coupling 59 and,
has its lower portion formed with a J-slot coupling 52
thereafter, the piston 37 may move downwardly the length
engageable with a connecting pin 53 so that the third
of movement between ?ngers 72 and 73. Since the
tubing string may be releasably attached to the upper
?ngers 72 are also, in fact, connected with the piston
packer. The bore 51 is preferably of a different ‘diameter
and the ?ngers 73 are connected with the tubing T1, the
or size than the bore 47 and the tubings T2 and T3 are of 30 piston may undergo a downward movement suf?cient to
different diameters so that when each of these strings
set the elastic packing element '26 without imparting the
is run independently and adapted to be attached in its
same movement to the tubing string T1. In this manner
respective bore, the proper tubing will set within the
any stretch in the tubing, which might be caused by pres
proper bore. The bore 51 of the upper body 23 is con
sure application, is eliminated.
tinued by means of an elongate pipe section 54 which ex 35
Below the coupling 79 is the safety joint F, said joint
tends downwardly through aligned passages provided in
including threads 62 which have the same lead as the
the elastic packing element 26, expander 29, cylinder
threads 61 of the coupling 59.
head 36 and piston 37; obviously, this pipe section forms
When it is desired to release the packing element and
a continuation of the tubing string T3 and, as shown in
slips of the packer C, it is necessary to raise the tubing
FIGURE 5 C, this section terminates just below the upper 40 T1 with respect to the packer. The threads 61 of cou
packer C. Within the lower portion of the pipe section or
pling 59 are left-hand threads and by rotating the tubing
conductor 54 is an annular seat 55 which is adapted to
T1 to the right, the threads 61 are disconnected thereby
receive one of the removable plugs B when it is desired
permitting the tubing T1 to be raised with respect to the
to pressure up within the third tubing string T3.
packer to place the ports 40 in registration with release
As previously described, the upper packer C may be 45 ports 44. After the pressure between the piston and
set by applying ?uid pressure from the interior of the ?rst
cylinder is relieved, it is desirable to reconnect the tubing
tubing string T1. However, it might be desirable to
T1 to the packer assembly and to accomplish this, the
actuate the packer by ?uid pressure from within the tub
threads 78 of the coupling 79 are engaged with the
ing T3 and for this purpose an angular passage 56 (FIG
threads 77 of the coupling 59. The distance between
URE 5B) is provided. The passage is similar in con
coupling 59 and coupling 79 is such that sui?cient up
struction to passage 38 and has a back-check valve 57
ward movement of the tubing T1 may be accomplished
mounted therein. The passage communicates with an
to effect release of pressure and, thereafter, tubing T1 is
opening or port 58 formed in the tubular conductor or
reconnected through said threads 77 and 78 to the upper
pipe 54. A similar passage (not shown) is formed in
packer C whereby the tubing T1 may be utilized to
the piston 37 and has its lower end communicating with 55 withdraw the packer from the well bore.
a port 58a provided in the tubular conductor 50 which
In the event it is necessary, the ends of the ?ngers 72
forms a part of the second tubing string T2. With this
and 73 may be engaged with each other and then by taking
arrangement it is obvious that the packing element 26
tension on the tubing and thereafter rotating said tubing,
and slips of the upper packer may be set by pressuring up
an upward jarring blow will be delivered to the extension
through any one of the three tubing strings. Release of 60 60 and mandrel 25 to assist in releasing the packer.
pressure, however, and unsetting of the packing element
As Will hereinafter appear, the manipulation of tubing
and slips of said packer is accomplished only by manipu
T1 may also effect a release of the intermediate packer B
lating the ?rst string T1.
and the lowermost packer A. However, if the two lower
After extending through the upper packer ‘C, the ?rst
packers do not release for one reason or another, the con
tubing string T1 extends downwardly below the upper 65 tinued rotation of tubing T1 will break out the threads
packer and is connected thereto by a special clutch cou
of the safety joint F and the upper packer may be with
pling 59 formed on a tubular extension \60 which ex
drawn from the well bore separately from the other
tension is secured to the piston 37 of the packer assembly.
packers.
.
The coupling 59 is of special construction and is pro
The ?rst tubing string T1 continues downwardly through
vided, not only for the purpose of coupling the packer 70 the second packer as is illustrated in FIGURE 5D. The
C to the string T1, but also for the purpose of permitting
construction of the intermediate packer B is substantially
the endwise compressive force to be applied to the pack
the same as that of the upper packer C except that it is
ing element 26 Without transmitting the downward move-,
provided with one bore 24a for the reception of tubing T1
ment of the packing element, piston and mandrel 25,
and a second bore 47a for the reception of the second tub
as caused by such compressive force, to the string T1; 75 ing string T2. Since tubing string T3 terminates just be—
3,098,524.
10
low the upper packer, it is not necessary to provide a third
the left~hand threads 61 of coupling 59. This permits
upward movement of the tubing T1 to locate the pressure
port 40a in alignment with the release port 44a of packer
B thereby relieving the pressure from- between the piston
137a ‘and the cylinder head 36a. Thereafter, the tubing
T1 may be reconnected with the packer B through the
threads 77 of coupling 59, which threads engage the
threads 78 of coupling 79. A safety join-t G is connected
bore through the packer B.
Since the construction of the intermediate packer is sub
stantially the same as the upper packer, it is not believed
necessary to describe the same in detail. However, brie?y,
the intermediate packer includes an upper body 23a, a
packing element 26a, an expander cone 2%, slips 30a, a
cylinder 35a having a head 36a and a piston 37a. The
piston has an extension dila projecting downwardly there
from and the special clutch coupling 59‘ connects the tub
ing T1 with the packer B.
The piston 37a is formed with an angular port 38a
having a back-check valve 39a. The ‘angular port is
below coupling 79 and if packers B and A can not be
released at the same time, this safety joint may be broken
out to allow removal of packer B separately from the
lower packer A.
The ?rst tubing string T1 extends downwardly and
adapted to communicate through an opening or port 40a
through the lower packer A (FIGURE 5F) and supports
provided in the tubing T1 with the bore of the tubing 15 said lower packer. The lower packer A is illustrated in
whereby pressure within the tubing T1 may be introduced
FIGURE 5F and generally ‘follows the construction of
into the area between the piston 37a ‘and the cylinder head
packers B and C heretofore described. As shown in
36a. A release of pressure from this area may be ef
FIGURE 5F, packer A includes an upper body or header
‘fected when the tubing T1 is lifted and the port 4% is
213b, which has a tubular pipe section or mandrel 25b
registered with a release port 440 provided in the tubular 20 extending downwardly therefrom. An elastic pac'king
support ‘or mandrel 25a of the packer B.
element 26b surrounds the mandrel section 25b and
To permit pressuring up through the second tubing
below said packing element is an expander cone 2%,
string, a tubular conduit 50a extending through the packer
which is suitably supported on a shoulder or ring 31b.
assembly B and ‘forming a continuation of the second tub
Gripping slips 32b have their lower ends connected to
ing string T2 is formed with a port 5921. This port is 25 the upper end of the cylinder head 36b of a cylinder 3511.
adapted to register with a second angular passage 5642
A piston 37 b has connection with the lower end of the
having a check valve 57a therein.
The packers C and B are not only connected by reason
of the ?rst tubing string Tl but are ‘also connected by the
tubular conductor formed by the sections TZ-a and T2~b 30
tubular section or mandrel 25b. The cylinder is non
rotatably connected to the piston by means of an index
pin 42!) which rides in a slot 43b in the exterior of the
piston. A shear pin 42:: formed on the inner end of the
index pin normally connects the cylinder in a lowered
(FIGURE 5C). As previously explained, the sections
position relative to the piston.
TZ-a rand T2~b are joined together through a union 13,
The tubing T1 extends entirely through the packer A,
such union being necessary in order that the tubular con
passing downwardly through the tubular section or man
ductor formed by the sections may be made up at the
drel 25b and projecting from the lower end of piston
same time that the tubing T1 is connected to the packers
37]). The special clutch coupling 59, illustrated in FIG
B and C. As has been noted, it is desirable to lower
URE 9, has its lower porton 74 threaded onto the ex
packers B and C by means of the ?rst tubing string '11
tending end of the tubing string T1. The upper section
land it is also desirable that the sections T2-a and T2-b
70 of the special coupling 59 has its ?ngers '72 inter
of the second tubing string ‘be in place between these two
packers. The provision of the union 13 makes it pos 40 engaged with the ?ngers 73 of the lower section and the
shear pins 75 connect the parts in the position shown in
sible to connect the pipe or conductor ‘50, which is part
FIGURE 5F.
of the string T2 and which is actually the section T2-b,
Pressure may be applied to the area between the piston
to another conductor 150 which actually vforms the lower
37b and the head 36b of the cylinder 35b through an
portion of section T2—a. The conductor 150‘ ?ts within
the bore 47a of the intermediate packer B and has its lower 45 ‘angular passage 38b having a check valve 39!) disposed
therein. A port 401) is provided in the tubing T1 and
end sealed oh? by suitable packing 68. It might be noted
when a plug E is dropped into the lower end of the tubing
that the pipe 150 does not have a J-slot connection but is
T1, as shown in FIGURE 5G, to seat upon a shoulder
merely a sliding ?t within bore 47a, so that it may be run
into position and removed separately from the first tubing
string.
The tubular pipe or conductor ‘Silo, which (forms a
continuation of tubing T2, terminates just below the
packer B and is provided with an internal valve seat 69
(‘FIGURE 5E) which is adapted to receive one of the
‘90 within special coupling 91, pressure within the tubing
50 "D1 is directed through port 40b past the check valve and
into the area between piston and cylinder head.
The packing element and slips of packer A is set in the
same manner as the other packers, that is initial pres
sure between the piston and cylinder head, shears pin 42c
removable plugs E which is dropped into position when 55 allow-ing upward movement of the cylinder and results
in setting of the slips 32b; upon setting of the slips, the
it is desired to pressure up the tubing T2. Of course,
reaction force of the pressure urges the piston 3711 down
when the plug is not in place, the lower end of tubing T2 is
wardly to shear the pins 75 in the special coupling 59‘.
in communication with the area below the intermediate
Thereafter, piston 37b and tubular section or mandrel
packer B.
The second packer B operates in substantially the same 60 25b move downwardly to apply a force on the upper end
of the elastic packing element 261). This downward
manner as the upper packer C as has been described and
movement of the piston is permitted without aplying any
when pressure is applied between the piston 37a and the
downward stretch to the tubing string T1.
cylinder head 36a, slips 39a are ‘?rst moved up into grip
In order to release the packer A, the tubing string
ping position and then the reacting force moves the piston
37a downwardly to apply a downward force through the 65 is lifted upwardly until the coupling 91 at the lower end
thereof has its threads 92 engaged with the internal threads
‘tubular support 25a to the upper end of the elastic pacle
77 of the special coupling 59, ‘after which the tubing string
ing element 26a. This effects 1a setting of the packing
T is again reconnected with the lower packer A to per?
element and slips of the packer B. The provision of the
mit removal thereof from the well bore.
special coupling 59‘ permits setting of the packing element
The particular construction of the check valves 39,
of the packer B without applying a downward stretch to 70
39a and 39b and the check valves ‘57 and ‘57a is subject
the strings T1 and T2.
to variation; however, a preferred form of check valve
As noted, the tubing T2 terminates below the intermedi
arrangement is illustrated in FIGURE 8 which shows the
ate packer B but tubing T1 extends downwardly through
check valve 3% in the lower packer. The angular pas
the lowermost packer A. In releasing the intermediate
packer B, tubing T1 is rotated to the right and disconnects 75 sage 3817 is provided with a lower annular seat 93 and an
3,098,524.
11
12
upper annular seat 94. A spring pressed ball 95 engages
the lower seat and a spring pressed ball 96 engages the
upper seat. Both valves open to permit entry of pressure
[?uid into the area between piston 37b and the head 36b
around the unset lower packers. Or, as explained, a
washing operation may be carried out to clean the well
bore of mud and to wash the face of the formations. By
dropping the plug into the second tubing string T2, the
intermediate packer B and the uppermost packer C can
be set simultaneously and by proper circulation and pres
sure buildup through the tubings T1 and T3, the sealing
the area between piston and cylinder head since if one
efficiency of these packers can be tested. The apparatus
is extremely versatile and permits the carrying out of any
valve leaks, the other will hold.
Any suitable type of removable plug E may be em 10 desired operations and the setting of the packers in any
ployed and, as a matter of fact, a ball valve could be
desired order, followed by proper testing to assure that
dropped in lieu of the plug E to close the lower ends of
they are in set position. ‘
the three strings of tubing T1, T2 and T3‘. By providing
In releasing the packers, it is only necessary to rotate
a plug, it is possible to retrieve the same and to remove
and raise the ?rst tubing string Tl since this will relieve
it by a wire line operation and one form of plug is shown 15 the trapped pressure from between the operating pistons
in FIGURE ‘10. This ?gure illustrates the coupling v91 at
and cylinders of said packers. Thereafter, strings T3 and
the lower end of string T1 and, as mentioned, this cou—
T2 may be uncoupled and independently removed, after
pling includes an annular seat 90. The plug vE includes
which all packers may be removed by withdrawal of the
a main body 97 having sealing rings 98. The body is
string T1.
provided with a cage 99 which is telescoped by a ?shing 20
The provision of the safety joints F and G between the
neck 100‘. The lower end of the ?shing neck. carries an
packers assures that if initial rotation of the ?rst string T1
inner valve 101 which has a portion sealing with the
will not effect a release of all connections between the
bore 97a of the body 97.
string T1 and the respective packers, it is possible to
'It will be obvious that the plug, when in position as
first break .out the safety joint F between packers B and
shown in FIGURE 10, ‘will close the bore of the tubing 25 C and to remove the upper packer C. Such removal
string T1 against downward ?ow therethrough. When a
would, of course, remove the lower sections TZ-a and
suitable retrieving tool is engaged with the enlarged head
TZ-b of string T2 since this string merely has a slip
of the ?shing neck 100, the inner valve 101 is unseated
joint connection with packer B. Thereafter, a suitable
to equalize pressures across the plug and continued up
?shing tool or overshot may be engaged with the string
of the cylinder but function to prevent any reverse flow
through the passage. By providing two ball valves, it is
assured that the pressure will be properly retained within
ward movement will remove the plug from its seat.
30 T1 at the upper safety joint and through manipulation
The use of the apparatus and the particular method
of completing multiple zone wells is illustrated in FIG
URES ‘1 to 4. As previously mentioned, the ?rst tubing
string T1 has the lower packer A mounted thereon and is
lowered as shown in FIGURE 1. Properly spaced on 35
tubing T1 is packer B and after packer B is mounted, the
both packers A and B may be removed. If packer A is
not disconnected from the string T1 at this time, the
second or lowermost safety joint may be uncoupled so that
packer B can be withdrawn separately. Subsequently
packer A may be removed independently.
The use of the hydraulically set packers, which are
~ section T2-a of the second tubing string T2 is placed in
positively actuated by the pressure between piston and
position. .Thereafter, the uppermost packer C is con
cylinder head, assures that positive setting of the packers
nected to the ?rst tubing string T1 and at this time the
is obtained upon the application of pressure through one
second section TZ-b of the second string T2 is coupled 40 of the tubing strings. As noted, each packer is of the
in position by the union 13. This arrangement is illus
type in which the packing element is deformed by endwise
trated in FIGURE 2. The three packers are then lowered
compressive force and the construction is such that stretch
by means of the ?rst string T1 with the tubular conductor
ing of the strings is avoided when the packing element is
formed by sections TZ-a and TZ-b extending between
moved to set position. Since the pressure is trapped in
packers B and C and being lowered along with said 45 the area between the piston and cylinder, the packers
packers.
After the packers are properly located, the upper section
T2~c is independently run into the well and its lower end
is coupled by means of the J-slot connection Alb-~49‘v
can not be released until the pressure acting upon the
packers is released.
Release of all packers is accom
plished by manipulation of only the ?rst production
string T1, whereby control is maintained through the
(FIGURE SE) to the upper packer seat. Finally the 50 single string.
third string T3‘ is run into the well and is coupled to the
Although three packers are shown as separating three
upper packer through J-slot connection 52-»5-3. The
separate formations, the apparatus lends itself to the use
hanger 20 of the control head D is then positioned and all
of any number of packers and in actual practice as many
three production or tubing strings are properly supported
as ?ve packers separating ?ve producing zones in a single
therefrom after which the hanger is bolted in place in the 55 well have been employed. Of course, in such instance
usual manner on the tubing head 22. Since the tubing
two additional strings of tubing must be provided to con
strings have the control valves 21 therein and since the
duct independent flow from each zone to the surface. Of
outlet 14 of the tubing head is provided with a control
importance from a practical standpoint is the fact that all
valve, the well is completely under control.
production strings may be landed in ?nal position in the
When all of the production or tubing strings are in 60 control head equipment prior to the time that the packers
?nally landed position in the control head equipment,
are set whereby various washing or other operations may
none of the packers A, B or C are in set position and it is
be carried out; the packers, being hydraulically set, may
now possible to circulate or perform any washing or other
thereafter be moved into sealing position without dis
operation within the well while said well is under complete
turbing the production strings.
control. Thereafter, the packers may be selectively set 65 ,The foregoing disclosure and description of the inven
in any desired order and without causing a stretching of
tion is illustrative and explanatory thereof and various
the production strings. If a plug E or closure is dropped
changes in the size, shapes and materials, as well as in the
into tubing T1 and this tubing is pressured up, all three
details of the illustrated construction, may be made within
packers maybe set simultaneously by the same pressure.
the scope of the appended claims without departing from
On the other hand, if it is desired to set the uppermost 70 the spirit of the invention.
packer ?rst, this may 'be ‘done by pressuring up through
I claim:
the string T3. After setting of the upper packer, pressure
1. The method of completing a multiple Zone well
testing to assure that it is properly set may be carried
which includes, connecting a lower hydraulically-actuated
out, this being accomplished by circulating downwardly
well packer to the lower end of a ?rst production string
through the ?rst tubing string T1 and then upwardly '15. and lowering said packer and string a predetermined dis
3,098,524
13
14
tance within the well bore, the lower end of said ?rst pro
duction string communicating with the area below the
of the lower packer to actuate the same whereby said
lower packer may be set by pressure conducted thereto
lower packer, then connecting a hydraulically-actuated
intermediate well packer to said ?rst production string
and continuing the lowering of said ?rst string and pack
from the ?rst production string, means for directing ?uid
pressure from the second production string to the hy
ers, lowering a tubular conductor into the well and con
draulically-actuated means of the upper packer to actuate
the same whereby the upper packer may be set independ—
necting the lower end thereof to the intermediate packer
ently of the lower packer, means in each packer main
taining pressure within the hydraulically-actuated means.
to extend upwardly therefrom, the lower ‘end of said con
to maintain the packers in set position, the releasable
ductor communicating with the area between the lower
and intermediate packers, thereafter connecting an upper 10 means connecting the ?rst production string and the well
hydraulically-actuated packer to said ?rst production
string and also coupling the upper packer to said tubular
packers being releasable by a manipulation of the ?rst
production string whereby said ?rst production string is
moved relative to said packers, and valve means on said
conductor, then further lowering the ?rst production string,
?rst production string operated by such movement of said
packers and conductor to locate said packers in ?nal posi
tion within the Well bore, then running the upper portion 15 production string to release the pressure acting upon the
hydraulically-actuated means of said packers to effect an
of a second production string and releasably connecting
unsetting of said packers.
it to the upper packer to communicate with the tubular
5. A well completion apparatus as set forth inclaim 4,
conductor, said upper portion of the second string and
together with means for reconnecting the well packers to
the tubular conductor forming the complete second pro
duction string, running a third production string and re~ 20 said ?rst production string after said packers have been
unset, whereby the packers may be removed from the well
leasably‘ connecting it with the upper packer to communi
bore by means of said ?rst production string.
cate with the area between the upper and intermediate
6. A well completion apparatus including, a ?rst pro~
packers, landing all production strings in ?nal position
duction string, a lower Well packer, releasable means re
in the well how, and thereafter setting all hydraulically
actuated well packers by applying a pressure thereto from 25 leasably connecting the lower well packer to said produc
tion string, an upper well packer spaced upwardly from
the bores of ‘the production strings.
~
the lower well packer, releasable mean-s releasably con
2. The method as set forth in claim 1, together with
necting the upper well packer to said production string,
the additional steps of maintaining the actuating pressure
the lower end of said ?rst production string communicat
against the well packers to maintain the same in set posi
tion even though they pressures in the bores of the produc 30 ing with the area below the lower packer, a second pro
duction string extending through the upper packer and
tion strings are reduced, and subsequently manipulating
having its lower end communicating with the area be
the first production string to relieve the hydraulic pres
sure applied to the well packers to effect a simultaneous
release and unsetting of all packers.
tween the packers, each packer including hydraulically
actuated packer-setting means for setting the packer,
3. The method of completing a multiple zone Well 35 means for directing ?uid pressure from the ?rst produc
which includes, connecting a lower hydraulically-actuated
tion string to the hydraulically-actuated packer setting
well packer to the lower end of a ?rst production string
and lowering said packer and string a predetermined dis
tance Within the well bore, then connecting a hydraulically
actuated intermediate Well packer to said ?rst production
means of both packers to actuate said packers whereby
both packers may be set by pressure conducted thereto
from the ?rst production string, means within each Well
packer for trapping the pressure which has been applied
to the hydraulically-actuated packer-setting means there
string and continuing lowering of the string and packers,
lowering a tubular conductor into the well and connecting
of to maintain the packer in set position without the neces
the lower end of a tubular conductor to the intermediate
sity of maintaining pressure in the production strings, the
releasable means between the ?rst production string and
packer to extend upwardly therefrom, thereafter connect
ing an upper hydraulically-actuated packer to said ?rst 45 the well packers being releasable by a manipulation of said
?rst production string whereby the ?rst production string
production string and coupling said upper packer to said
conductor, then further lowering the ?rst production string,
is moved relative to the set packers and valve means on
the production string operated by such movement of said
packers and conductor. to locate said packers in ?nal posi
production string to release the trapped pressure acting
tion within the well bore, then running the upper portion
of a second production string and releasably connecting 50 upon the packer-setting means of the packers to effect un
setting of said packers.
it to the upper packer to communicate with the tubular
7. A well completion apparatus as set forth in claim 6,
conductor so that said, upper portion and said tubular
together with means for reconnecting the well packers to
conductor forms the complete second production string,
said ?rst production string after said packers have been
running a third production string and releasably connect
ing it with the upper packer, landing all production strings 55 unset, whereby the packers may be removed from the
well‘ bore by means of said ?rst production string.
in ?nal position in the well bore, setting the upper packer
by conducting pressure from the third production string
8. The method of completing, a multiple zone well as
set forth in claim 1, together with the step of conducting
pressure from the ?rst production string to all three of the
well bore below the upper set packer to wash the well
bore, and thereafter setting the intermediate and lower 60 hydraulically-actuated packers to set said packers.
9. The method of completing a multiple zone well as
packers by conducting pressure from the ?rst production
string to said packers.
set forth in claim 1 together with the steps of conducting
pressure from the third production string to the hydrau
4. A Well completion apparatus including, a ?rst pro
to said packer, performing a washing operation within the
duction string, a lower well packer, releasable means re
lically-actuated upper packer to set the same, and con
leasably connecting the lower well packer to said produc 65 ducting pressure from the ?rst production string to the
hydraulically-actuated intermediate and lower packers to
tion string, an upper well packer spaced upwardly from
set the same.
the lower well packer, means releasably connecting the
upper packer to said production string, the lower end of
10. The method of completing a multiple zone well as
set forth in claim 1, together with the steps of conducting
said ?rst production string communicating with the area
below the lower packer, a second production string extend 70 pressure from the second production string to the upper
ing through the upper packer and having its lower end
and intermediate packers to set the same, and conducting
communicating with the area between the packers, each
pressure from the ?rst production string to the lower
packer including hydraulically-actuated means for setting
packer to set the same.
the packer, means for directing ?uid pressure from the
11. A well completion apparatus including, a ?rst pro
?rst production string to the hydraulically-actuated means 75 duction string lowered into a well bore which traverses
8,098,524
16
15
at least two producing Zones, a pair of well packers mount
ed upon and releasably connected to said string and
leasably connected to said string, an intermediate well
packer mounted on and releasably connected to said string,
adapted to seal oil? the producing zones when moved to a
an upper well packer mounted on and releasably con
set position, said ?rst production string having its lower
end communicating with the area below the lower packer,
means releasably connecting said well packers to said
nected to said string, means releasably connecting said
well packers to said ?rst production string, a tubular
conductor extending through and between the upper
?rst production string, a second production string extend
packer and the intermediate packer and having its lower
ing from the surface of the well and through the upper
end communicating with the ‘area between the intermedi
packer with the lower end of said second production string
ate and lower packers, the ?rst production string having
communicating with the area between the packers, the 10 its lower end communicating with the area below the
well packers being in a retracted non-sealing position dur
lower packer, said ?rst production string, well packers
ing lowering thereof to the desired elevation within the
and connecting tubular conductor being lowerable in
Well bore, hydraulically-actuated means in each packer
the hole as a unitary assembly with the packer in a re
for moving each packer to a set or sealing position, means
for conducting ?uid pressure from at least one of said
production strings to said hydraulically-actuated means
to actuate the same and set the packers, normally closed
valve means associated with the hydraulically-actuated
means of each packer for trapping the actuating ?uid pres
sure within said hydraulically-actuated means to maintain
tracted position, an upper section of a second produc
tion string extending upwardly from the upper packer
and having its lower portion releasably connected to the
upper packer and having its lower end communicating
with the tubular conductor, said section of the second
string and the tubular conductor forming the complete
second production string, a third production string hav
each packer in set position, said valve means being opened
ing releasable connection with the upper packer, means
by a manipulation of said ?rst production string when the
communicating the lower end of the third produc~
?rst production string is moved relative to the packers to
tion string with the area between the upper and inter
release the trapped ?uid pressure and thereby release the
mediate packers, control head equipment at the surface
25 of the well, means ‘for landing all three production strings
packers from set position.
12. A well completion apparatus including, a ?rst pro
in ?nal position in said control head equipment while the
duction string lowered into a well bore which traverses
well packers are still in unset position, each well packer
‘at least two producing ‘zones, a pair of well packers
including hydraulically-actuated packer-setting means for
mounted upon and releasably connected to said string
setting said packer, and means conducting ?uid pressure
and adapted to seal cit the producing zones when moved 30 from a production string to the hydraulically-actuated
to a set position, means releasably connecting said well
packer-setting means of each packer to actuate the same
packers to said ?rst production string, each packer in
and eifect setting of the packers after the control head
cluding an elastic packing element which is deformable
equipment is in place on the well head.
by application of an endwise force thereto and also in
14. A well completion apparatus as set ‘forth in claim
cluding hydraulically-actuated means :for applying such 35 13, together with normally closed valve means associated
endwise ‘force to said packing element, said ?rst produc
with the hydraulically-actuated means of each packer
tion string extending through both packers and having
for’ trapping the actuating ?uid pressure within the hy
its lower end in communication with the area below the
draulically-actuated means to maintain each packer in
lower packer, a second production string extending trom
set position, the ?rst production string being moved rela
.the surface and through the upper packer with the lower 40 tive to the packers to open said valve means and release
end of said second production string communicating with
the area between the packers, said packers being in a re
the trapped pressure and thereby simultaneously release
the packers from set position.
tracted non-sealing position during lowering thereof to
15. A well completion apparatus as set forth in claim
the desired elevation within the well bore, means for
13, together with a safety joint connection in the ?rst
conducting ?uid pressure from at least one of said pro 45 production string and located between the lower and
duction strings to said hydraulically-actuated means to
intermediate packers, and a second safety joint connec
actuate the same and set the packers, normally closed
tion in said ?rst production string and located between
valve means associated with said hydraulically-actuated
the intermediate and upper packers.
means of each packer for trapping the actuating ?uid
References Cited in the ?le of this patent
pressure within said hydraulically-actuated means to
UNITED STATES PATENTS
maintain each packer in set position, said valve means
being opened by .a manipulation of said ?rst production
string when the ?rst production string is moved relative
381,013
Hoadley ____________ _.. Apr. 10, 1888
to the packers to release the trapped ?uid pressure and 55
1,523,286
1,861,332
2,121,002
Railsback ___________ __ Jan. 13, 1925
Wai-tz ______________ .. May 31, ‘1932
Baker ______________ __ June 21, 1938
duct-ion string, a lower well packer mounted on and re
2,791,277
2,903,066
Ilfrey et va1. __________ __ May 7, 1957
‘Brown ______________ __ Sept. 8, 1959
thereby release the packers from set position.
13. A well completion apparatus including, a ?rst pro
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