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Патент USA US3054465

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Sept. 18, 1962
J. w. BONNER
3,054,453
WELL PACKER
Original Filed March 14, 1955
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INVENTOR.
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1
35,054,453
Patented Sept. 18, 1962
2
Helical garter spring 45 around the slips in grooves 46
3,054,453
WELL PACKER
James W. Bonner, 8305 Baker, Houston, Tex.
Continuation of application Ser. No. 494,169, Mar. 14,
1955. This application Sept. 15, 1958, Ser. No. 761,249
8 Claims. (£1. 166—138)
This invention pertains to well packers, especially per
manent type production packers, and to apparatus for set
ting same.
Advantages of the invention include ability to set pack
tends to prevent such radial outward motion.
Above slip 40 a shear ring 50 is disposed in an annular
groove 51 around the mandrel. Shear ring 50 is prefer
ably an O-ring of neoprene or other material of like
strength which will shear when a load of about 10,000
pounds is placed on it. This shear ring supports down
wardly tapered slip expander cone 52 slidably mounted
thereabove on mandrel 21.
The upper end of cone 52 is provided with an upward
ly directed ?ange 53 at its outer edge, forming an annular
er, circulate, and set ?ow tube all in a single trip into the
well, assurance that the packer will not set prematurely,
simplicity, ease of operation, reliability, and low cost.
This application is a continuation of my prior copend 15
pocket 54 between the ?ange and mandrel. A packer
ing application Serial No. 494,169 for “Well Packer,”
Packer sleeve 55 can slide on the mandrel when forced to
do so, not being bonded thereto but not either being a
loose fit.
The upper end of sleeve 55 is also tapered at 57 to ?t
into annular recess 58 formed between mandrel 21 and
?led March 14, 1955, now abandoned.
For a description of a preferred embodiment of the in
vention reference is made to the accompanying drawings
in which FIGURES 1A and 1B, which are partly in sec
tion and partly in elevation, show respectively, the upper
and lower portions of an apparatus according to the in
vention.
Referring to the drawings, there is shown a locator sub
10 whose upper end is exteriorly threaded at 11 for con 25
nector to the well tubing on which the apparatus is low
ered into the well. The locator sub has an internal thread
sleeve 55 of 85 durometer hardness synthetic rubber com~
pound (such as “Hycar”) is disposed around mandrel 21
and its lower end is tapered at 56 to ?t into pocket 54.
downwardly directed ?ange 59 on upwardly tapered slip
expander cone 60 which is slidably mounted on mandrel
21. Cone 60 is held against upward axial motion by
shoulder 61 on mandrel 21.
Above cone 60 there are a plurality of slips 70 disposed
around the mandrel 21. The upper ends of these slips
are provided with inturned ?anges 71 which engage with
12 for connection to‘seal nipple 13.
annular recess 72 in slip support ring 73, thereby prevent
Seal nipple 13 is provided at its lower end with collar
ing ‘axial movement of the slips up or down independent
14 welded thereto at 15, and which may preferably be in 30 of ring 73 unless there is ?rst a radial outward motion of
tegral therewith. Collar ‘14 has an internal thread 16 into
the slips. A helical garter spring 74 disposed around the
which is screwed the upper end of a flow tube 17 which,
slips in grooves 75 tends to prevent such radial outward
as shown in FIGURE 13, extends clear to the lower end
motion of the slips.
of the apparatus. The lower end of the flow tube is ex
Slip support ring 73 has an internal thread 76 engaging
ternally chamfered at 18 to provide a guide surface.
The 35 a four thread left hand thread 77 on mandrel 21. Stop
pins 78, 79 on the ring and mandrel prevent these threads
sub 10, seal nipple 13, collar 14, and ?ow tube 17 thus
form one continuous pipe.
The lower end of locator sub 10 is threaded externally
‘from being made up tight. Drag means comprising a plu
rality of bowed leaf wiper springs 80 are secured to ring
at 20 with six left hand threads, this being the opposite
73 at their lower ends by screws 81. The upper ends of
hand to the usual threaded connections of the tubing string 40 the springs are secured to a stabilizer ring 82 by screws 83.
on which the apparatus is run and opposite to the other
Between seal nipple 13 and the enlarged interior base
threaded connections of the apparatus which are right
of the upper portion of mandrel 21 there are a plurality
handed except as noted. The lower end of the locator
of sets of packing rings 9|‘), 91, 92, 93, preferably each
set comprising a plurality of chevron packing rings, alter
sub is screwed into the upper end of mandrel 21. Shoul
nate sets being oppositely directed. Between the sets of
ders 22 and 23 on the locator sub and mandrel limit the
packing rings are junk rings 94, 95, 96, 97, 98. There
engagement thereof.
is thus provided a long travel telescopic sliding joint and
Mandrel 21 extends nearly to the bottom of the appara
seal. The mandrel 21, as indicated by the break in the
tus. At its lower end mandrel 21 is provided with an ex
ternal screw thread 24 on which is screwed a slip retainer 50 drawing, FIGURE 1A, may be of "any desired length de
pendent on the desired length of travel of the telescopic
ring 25. The lower end of ring 25 is externally threaded
joint, but the sealing means including the packing rings
at 26 whereon a junk pusher tube 27 is screwed. Tube 27
90-93 need not be as long as the travel of the joint, and
is provided with slots 28 to allow ?uid to pass up inside
junk ring 93 is made long enough to ?ll the remaining
tube 27 and thence out slots 28 when the apparatus is be
space.
ing lowered in a well, any junk in the hole which might 55 The upper end of junk ring 98 engages an O-ring type
interfere with the slips being trapped in tube 27 or pushed
seal ring 99 disposed in an annular rabbet on the inner
ahead out of the way.
edge of the lower end of locator sub 10, so that all the
The inner edge of the lower end of ring 25 is bevelled
sets of packing rings and junk rings are ?rmly held on
to form a tapered valve seat 30 having an annular groove
seal nipple 13 between the locator sub ‘and collar 14,
31 in which an 0 ring type seal ring 31a is disposed. A
whereby the seal means including the packing rings is
removable from the mandrel with the seal nipple as a
check valve 32 is pivotally mounted at 33 on the lower end
unit. On reinserting the seal means in the mandrel col
of ring 25. Valve 32 is tapered correlative to valve seat
lar 14 acts as a guide to insure centering of the seal
30. Valve 32 is made of cast iron or other drillable ma
terial. The check valve prevents ?uid from rising in the 65 means relative to the mandrel before the seal means en
ters the mandrel. Since the ?ow tube 17 ?ts closely in
‘well above the packer if the ?ow tube 17 is removed.
side the lower portion of the mandrel and the seal means
A plurality of slips 40, having downwardly directed teeth
on seal nipple 13 ?ts inside an enlargement in the upper
41 adapted to resist downward motion when engaged with
end of the mandrel, the ?ow pipe is of large diameter so
a well casing, are disposed around mandrel 21. The slips
that full ‘size tubing can be used without restriction at
have inturned ?anges 43 engaged in annular groove 44 in 70 the lower end.
ring 25 whereby the slips are held against axial motion on
The apparatus is lowered into a well on a string of
the mandrel unless they are ?rst moved radially outward.
tubing to a level below the production zone and ?uid
3,054,453
4
ly, the friction means holds ring 73 stationary while the
is circulated. The apparatus is then raised to a level
above the production zone. The packer is then set by
mandrel is moved axially to set the wedge means.
The casing engaging friction means 8?”, together with
rotating the tubing to the right four turns to free ring
73 which is held. against rotation by springs 8% which
the threads 76, 77, and ring 73, ?anges 71, 72, garter
spring 74, shoulder 61, groove 51, shear ring 5!}, garter
spring 45, and ?anges 43, 44, constitute elements of
form a drag means frictionally engaging and bearing on
the inside of the casing.
mechanically releasable means (as distinguished from hy
It will be noted that while the connection between
draulically releasable means) to hold the casing gripping
mandrel and locator sub, comprising locator ‘sub threads
wedge means out of easing gripping position. The re
20, the mandrel threads engaged therewith, shoulders 22,
23, and the parts of the sub and mandrel engaged with l0 lease of this mechanically releasable means is initiated by
turning the mandrel to the right until threads 76, 77 are
the shoulders, can be made up tight, the stop pins 78, 79
disconnected, the friction means holding ring 73 against
prevent such tight makeup of the connection between
turning. Thereafter upward movement of the mandrel
mandrel and slip support ring, comprising threads 76, 77,
relative to the friction means, which tends to be stationary
so that the mandrel-sub connection stays connected upon
initial right hand rotation of the tubing. Only later 15 in the well, causes the casing gripping wedge means to be
moved into casing gripping position as the other elements
when the packer sleeve has gripped the casing, as will be
of the mechanically releasable means, such as the shear
described, is there enough holding force .on the mandrel
ring, are overcome. Disconnectable means .to connect
to enable the mandrel-sub connection to be ‘unscrewed.
the ?ow pipe to the mandrel comprises the threads 20,
Following disconnection of the ring 73 from the man
drel, an upward pull on the tubing then lifts cone 60 20 and this latter disconnectable means is disconnectable
only after the ?rst mentioned disconnectable means
into slips 70 which are held against upward motion by
springs 80 and ring 73. Cone ‘60 causes expansion of
the slips until they are ?rmly anchored to the casing.
Further upward motion of the tubing shears ring 5%)
so that the mandrel 21 can move axially upwards rela
tive to slips 70, cone 60, packer sleeve 55, and cone 52,
until slips 40 are engaged on cone 52.
Slips 40 are
moved radially by cone 52 until they are ?rmly engaged
with the casing. ‘Further upward movement of the tubing
(threads '76, 77) has been disconnected, for the packer
vmust be set in order to hold the mandrel against rota
tion while the ?ow pipe is rotated to unscrew threads 20.
25
While a preferred embodiment of the apparatus of
the invention has been shown and described, many modi
?cations thereof can be made by one skilled in the art
without departing from the spirit of the invention and it
is desired to protect by Letters Patent all forms of the
causes slips 40 and cone 52 to move upwardly relative 30 invention falling within the scope of the following claims.
I claim:
1. In combination, a mandrel having an axial passage
therethrough; a packer sleeve on said mandrel; upper and
pressed therebetween until it expands radially into seal
to cone 60 and slips 70 whose upwardly pointing teeth
101 resist such motion, and sleeve 55 is axially com
lower casing gripping slip and expander type wedge means
ing engagement with the well casing as well as mandrel
21. The downwardly directed teeth 41 on slips 40 pre 35 on said mandrel respectively’ above and below said packer
sleeve in abutment therewith actuatable to casing en
vent slips 40 ‘and cone 5 from moving down when the
gaging position with said sleeve compressed therebetween
upward pull on the tubing is discontinued.
by relative axial motion of said means towards each other
The radial motion of the slips 60 and 40 during set
from an initial position of greater separation; mechani
ting of the packer may be enough to free them from
40 cally\ releasable means for holding both of said casing
rings 73 and 25 if desired.
gripping slip and expander type wedge means in said ini
After the packer has been set, the tubing can be ro
tial position to keep them out of casing gripping position,
tated six turns to the right to disengage the locator sub
said mechanically releasable means including casing en
from the mandrel which is held against rotation by the
gaging friction means on ‘said mandrel connected to one
packer sleeve engaging the casing. The tubing can then
be elevated, taking the seal nipple and its packing and the 45 of said casing gripping wedge means, said mechanically
?ow tube with it and the well can be circulated above the
packer. The tubing can then belowered to replace the
flow tube and seal nipple in the packer and the well pro
releasable means also including connecting means dis
conneotable upon relative rotation between said mandrel
and friction means but when connected holding said fric
tion means to said mandrel to prevent relative axial mo
duced. It is not necessary to screw the locator sub back
into the mandrel since the seal nipple seals to the man 50 tion thereof, said connecting means being disconnected
by rotation of said mandrel while said friction means is
drel as soon as‘ its sealing means enters the mandrel;
held against rotation by casing engagement, said casing
however, it can be screwed back if desired. To the ex
gripping wedge means being actuatable to casing grip
tent ?ow tube 18 extends below the packer sleeve the
?uids initially in the well are trapped between the casing
ping position by axial motion of the mandrel relative to
27 ‘and ?ow tube 18, after the packer is set, so that the
said friction means after said connecting means is dis
packer is in contact with these initial well ?uids,’ e.g.
mud, rather than the oil subsequently produced, thus
binding casing and mandrel engagement upon axial com
protecting the packer against, deterioration.
'
The ?ow pipe and the mandrel and the means sealing
and connecting them together may be said to form’ a pipe
means, and the packer sleeve when set seals between the
well casing and the pipe means to direct the well ?uid
from the casing into the pipe means.
It will be seen that the slips 40 and 70 and the cones
connected, said packer sleeve expanding radially into
pression between said upper and lower casing gripping
means; a flow pipe; second connecting means discon
nectable by relative rotation between said flow pipe and
mandrel only upon application of torque thereto greater
than that required to disconnect the ?rst said connecting
means but when connected holding said pipe to said
mnadrel to prevent relative axial motion therebetween, the
52 and 60 provide casing gripping wedge means above 65 second said connecting means being ‘disconnectable' by
rotation ofrsaid pipe while said sleeve is in binding en
‘and below the packer sleeve 55, both the cones and the
slips being wedges. The springs 80 constitute casing
gagement with said casing and mandrel; said pipe having
a portion extending into said axial passage in the mandrel
when said pipe is connected to said mandrel; and means
ncctable connecting means to connect the friction means 70 to seal between the outside of said pipe and the inside
of said mandrel when said pipe portion is in said axial
to the mandrel to prevent relative axial motion thereof
passage.
includes the threads 76, 77. The function of the friction
'2. In combination, a mandrel having an axial passage
means is to engage the casing, which has two results.
therethrough; a packer sleeve on said mandrel; upper
.First of all it holds the ring 73 stationary while the man
drel is rotated to disconnect the threads 76, 77., Second 75 .and lower casing gripping slip and expander type wedge
engaging friction means and are connected to the upper
casing gripping Wedge means through ring 73. Discon
3,054,453
5
5
means on said mandrel respectively above and below
said sleeve compressible therebetween by relative
said packer sleeve in abutment therewith actuatable to
axial motion of said wedge means towards each
other from an initial position of greater separation;
casing engaging position with said sleeve compressed
therebetween by relative axial motion of said means to
wards each other from an initial position of greater 5
separation; mechanically releasable means ‘for holding
both of said casing gripping slip and expander type Wedge
means in said initial position to keep them out of casing
gripping position, said mechanically releasable means in
cluding casing engaging friction means on said mandrel 10
connected to one of said casing gripping wedge means,
said mechanically releasable means also including con
necting means disconnectable upon relative rotation be
tween said mandrel and friction means but when con
nected holding said friction means to said mandrel to 15
prevent relative axial motion thereof, said connecting
means being disconnected by rotation of said mandrel
while said friction means is held against rotation by cas
mechanically releasable holding means for keeping
both of said wedge means in said initial position,
said holding means including
drag means for frictionally engaging well casing,
said drag means being disposed on said pipe
means and being connected to one of said wedge
means,
second connecting means for holding said drag
means to said pipe meansto prevent relative
axial motion therebetween and thereby prevent
axial motion between said one of said Wedge
means and said mandrel, said second connecting
means being disconnectable by relative motion
between said pipe means and drag means upon
ing engagement, said casing gripping wedge means being
actuatable to casing gripping position by axial motion 20
application of torque less than that required to
disconnect said ?rst connecting means, which
torque is created by turning said pipe means
of the mandrel relative to said friction means after said
while said drag means resists rotation due to
connecting means is disconnected, said packer sleeve
expanding radially into binding casing and mandrel en
contact with said well casing, such disconnec
tion freeing said one of said wedge means for
gagement upon axial compression between said upper
and lower casing gripping means; a ?ow pipe; second 25
connecting means disconnectable by relative rotation be
tween said flow pipe and mandrel only upon applica
tion of torque thereto greater than that required to dis
said wedge means to casing engaging position
in which said packer sleeve expands radially
into binding casing and mandrel engagement,
connect the ?rst said connecting means but when con
nected holding said pipe to said mandrel to prevent rela
tive axial motion therebetween, the second said connecting
means being disconnectable by rotation of said pipe while
said ‘sleeve is in binding engagement with said casing and
mandrel; said pipe having a portion extending into said
axial passage in the mandrel when said pipe is con
nected to said mandrel; and means to seal between the
outside of said pipe and the inside of said mandrel when
said pipe portion is in said axial passage, ‘the upper por
tion of said axial passage in the mandrel being of larger
diameter than the lower portion thereof, said pipe having
a guide portion adapted to ?t slidingly inside said en
larged portion, and said sealing means being disposed
on said pipe above said guide portion and being adapted
to seal with said enlarged portion of said axial passage,
said pipe below said guide portion thereof ?tting sliding 45
ly inside the lower portion of said axial passage.
axial motion relative to said mandrel to move
said ?rst connecting means being disconnectable
by turning said flow pipe while said mandrel
is held against rotation by said binding engage
ment of said packer sleeve;
the improvement according to which
said second connecting means connects said drag means
to the mandrel portion of said pipe means whereby
when said ?rst connecting means is disconnected said
flow pipe can be removed from said mandrel With
out carrying with it said drag means, thereby facili
tating reinsertion of said ?ow pipe into said mandrel.
5. The combination of claim 4 further characterized
in that said packing means is on said flow pipe and is of
greater axial length than said ?rst connecting means
whereby said packing means can be partially engaged
Without connecting said ?rst connecting means, as when
said ?ow pipe is brought back to said mandrel after re
moval therefrom.
6. The combination of claim 5 in which the upper por
tion of said axial passage in the mandrel is of larger
3. The combination of claim 1 in which both of said
diameter than the lower portion thereof, said flow pipe
disconnectable connecting means comprise left hand
has a guide portion adapted to ?t slidingly inside said
threads, the casing engaging friction vmeans serving to
resist rotation in the casing whereby said disconnectable 50 enlarged portion and said packing means disposed on said
?ow pipe is above said guide portion and is adapted to
means connecting said friction means to the mandrel can
seal with said enlarged portion of said axial passage, said
be released by clockwise rotation of the pipe, and said
flow pipe below said guide portion thereof ?tting slidingly
packer sleeve when set holding the mandrel against rota
inside the lower portion of said axial passage.
tion whereby said second disconnectable means con
necting said mandrel to the pipe can be released by clock
h 7. The combination of claim 4 further characterized in
t at:
wise rotation of said pipe, the last mentioned disconnect
said mandrel is provided with a downwardly opening
able connecting means including ‘more turns of thread
check valve;
than the other disconnectable connecting means to in
said flow pipe has a portion extending inside said man
sure disconnection of the former only after the latter.
drel past said check valve holding said check valve
4. In a well apparatus comprising:
open,
pipe means including
said ?rst connecting means comprises left hand threads
a flow pipe and
on said flow pipe and mandrel,
a mandrel having an axial passage therethrough
said second connecting means comprises left hand
and telescopically engaged with said ?ow pipe
threads on said drag means and mandrel, and
?rst connecting means for holding said flow pipe 65
said second connecting means has fewer turns of threads
to said mandrel to prevent relative axial mo
than said ?rst connecting means, to facilitate discon
tion therebetween but disconnectable by relative
nection of the second connecting means prior to the
rotation therebetween, and
?rst connecting means.
packing means to seal between a portion of said
8. Well apparatus comprising
?ow pipe and a portion of said mandrel;
70
a mandrel having an axial passage therethrough;
a packer sleeve on said mandrel;
upper and lower casing engaging wedge means of the
a packer sleeve on said mandrel;
slip and slip expander type disposed respectively
upper and lower casing gripping wedge means of the
slip and slip expander type disposed on said mandrel
above and below said packer sleeve in abutment there
with and actuatable to casing engaging position with 75
respectively above and below said packer sleeve in
3,054,453
8
7
ing position with said sleeve compressed therebe
said ?ow pipe having a ?rst portion extending inside
said axial passage in the mandrel when said pipe is
tween by relative axial motion of said wedge means
towards each other from an initial position of greater
seal means independent ‘of said disconnectable means
abutment therewith and actuatable to casing engag
connected to said mandrel;
' in said initial position and releasable by a predeter
mined motion of said mandrel when said apparatus
is'inside a well casing, said mechanical means in
drag means for frictionally engaging well casing,
10
thread means holding said drag means to said man
15
release of said mechanical means for holding said
wedge means and movement of said wedge means to
casing engaging position causing said packer sleeve
to expand radially into binding casing and mandrel
engagement;
a ?ow pipe separate from said drag means and insert
able telescopically within said axial passage of said
mandrel from one end thereof;
disconnectable means for connecting said ?ow pipe to
said mandrel to enable said predetermined motion of 25
the mandrel required for release of said mechanical
in said axial passage; and
a check valve carried by said mandrel biased to posi
tion closing said axial passage through said mandrel
and opening in the direction of flow through said
passage from said one end thereof;
second portion then holding said check valve open;
said ?ow pipe being of full unrestricted opening
throughout its length including said ?rst and second
portions thereof;
~
7
whereby said packer sleeve can be set, the well above
the packer sleeve can be cleaned with the ?ow pipe
separated from the mandrel and disposed thereabove,
and the flow pipe re-engaged with the mandrel and
the well produced, all in one trip into the well.
References Cited in the ?le of this patent
UNITED STATES PATENTS
means
to be. imparted to said mandrel
from
.
.
. said flow
.
2,189,697
pipe and dlsconnectable by a certain motion of said
> 2 189 703
?ow pipe relative to said mandrel after said mandrel
2’22'8’242
is held by Said binding engagement of Said Packer 30 ' 2,551,240
sleeve between said mandrel and well casing;
'
said pipe having a second portion extending through
said mandrel past said valve when said ?rst portion
is in position to be sealed with said mandrel, said
said drag means being disposed on said mandrel
adjacent to one of said wedge means, and
drel,
'
and sealing between the outside of said pipe portion
and the inside of‘said mandrel when said portion is
separation;
mechanical means for holding both of said wedge means
V eluding:
‘
Baker ____r___p_--___'____ Feb. 6, 1940
Burt et al
Baker
v
'
Feb 6 1940
____________ “Jan
4’ 1941
Bonner—:__-_____:____—___—___:______ May 1’ 1951
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