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Патент USA US3032126

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May 1, 1962
A. BARRY
3,032,116
DRILL_S_‘I'EM TESTING PACKERS, PIPE, AND COUPLERS
Filed Dec. 11, 1958
2 Sheets-Sheet 1
I ! l rf d
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INVENTOR.
ADELBERT BARRY
MM”
ATTORNEY.
May 1, 1962
3,032,116
A. BARRY
DRILL STEM TESTING PACKERS, PIPE, AND COUPLERS
Filed Dec. 11. 1958
2 Sheets-Sheet 2
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nited Sttes atent
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1
3,032,116
DRILL STEM TESTING PACKERS, PIPE,
AND COUPLERS
Adelbert Barry, Houston, Tex., assignor, by mesne as
signments, to Jersey Production Research Company,
Tulsa, Okla., a corporation of Delaware
Filed Dec. 11, 1958, Ser. No. 779,636
5 Claims. (Cl. 166--187)
3,932,116
Patented May 1, 1962
2
from a more detailed description of the invention taken
in conjunction with the drawings wherein:
FIG. 1 is an elevational view of the apparatus of the
invention arranged in a borehole;
FIGS. 2 and 3 are elevational views, partly in section,
showing the apparatus of the invention between arrowed
lines 2—-2 and 3-3, respectively, of FIG. 1 in greater
detail;
FIG. 4 is an elevational, sectional view of the upper
This invention concerns apparatus for conducting sub 10 coupler connection;
surface formation tests and, in particular, packers, per
FIG. 5 is a view taken on lines 5-5 of FIG. 4;
forated pipe, and couplers for up hole straddle-pack drill
FIG. 6 is a view taken on lines é-—6 of FIG. 4;
stem testing.
FIG. 7 is an enlarged view of the valving arrangement
In drilling wells for the production of ?uids, especially
shown in FIG. 2; and
the production of petroleum ?uids, samples of formation 15 FIG. 8 is an elevational view of a modi?ed arrange
?uids are obtained during drilling operations, generally
ment of the apparatus showing a plurality of intercon
termed “drill stern testing,” in order to determine the type
nected couplers.
or types of ?uid contained in the formation traversed by
the borehole being drilled.
In FIG. 1 is shown a borehole 10 penetrating a sub
surface formation 11.
Apparatus is arranged in bore
At times it is necessary to obtain a ?uid sample from
a formation located some distance from the bottom of
hole 10 for conducting ?uids from formation 11 to the ap
propriate testing equipment connected to a drill stem or
the borehole. In this situation, it has been the practice to
pipe and includes the lower end of a drill pipe or drill
set two packers having a section of perforated pipe there
stem 12 to which is connected a packer in?ating ?uid
between above and below, that is, to straddle, the forma
pump section 13, an upper packer section 14, a perforated
tion to be tested. The test ?uids ?ow through the section 25 pipe section 15, a lower packer section 16 and a drill bit
of perforated pipe and to the drill stern located above the
(or anchor shoe) 17.
packers. For a successful test, it is necessary to equalize
Pump section 13 includes a piston rod 18, and a
the mud pressure in the well annulus by connecting the
annulus above the top packer to the annulus below the
cylinder 19. Upper packer section 14 includes an in
?atable packer 20 adapted to expand to seal off the an
bottom packer.
30 nulus A between the apparatus and the borehole wall
Also, it has been the practice when making drill stem
above formation 11 and an equalizing port 21 positioned
tests employing compression type packers to run a pipe
above packer 2!‘). Pipe section 15 is provided with a plu
passage between the upper and lower annulus. This pipe
rality of perforations 22 adapted to conduct ?uids from
is located centrally within the perforated pipe section
formation 11 to the interior of pipe 12. Lower packer
arranged between the packers. This type of arrangement CC CH section 16 includes an in?atable packer 23 adapted to
is disadvantageous because it is a time consuming and
seal o?C the annulus A between the apparatus and the
risky procedure because pipe couplings are employed and
borehole wall below formation 11 and an equalizing port
leaks which develop will communicate the formation ?uid
24 below packer 23. Drill bit 17 may be plugged prior to
to the mud annulus with resulting failure of the test. With
making the drill stem tests in order to prevent ?uids in
in?ation type packers it is necessary to provide an in?ating 40 annulus A from entering pipe 12 through the bit or in~
line to the bottom packer through the perforated section
stead a plug may be employed in place of drill bit 17.
in addition to the equalizing line to communicate the well
Details of pump section 13, packer sections 14 and
annulus above the upper packer and below the lower
16 and pipe section 15 are shown in FIGS. 2 and 3. A
packer. This procedure is even more disadvantageous for
cylinder~sub or closure member 25 formed to provide a
leaks which develop through the couplings will result in
packer in?ate passageway 26 and a ?ll-passageway 27
failure of the test and further, leaks in the in?ating line
is conected to the lower end of pump cylinder 19. A
will result in failure of the packers to in?ate.
valve assembly 28 (see FIG. 7) is arranged in passage
The present invention overcomes these disadvantages
way 26 and passageway 27 is provided with a removable
by providing equalizing passages in the walls of the per
plug 29. A guide head 31 is connected to the upper end
forated pipe sections and in the walls of the packer man
of cylinder 19. A piston 32 to which is connected a
drels. These equalizing passages extend longitudinally.
Couplers are provided at the pipe section joints and at the
joints between the pipe sections and the packer mandrels
which couplers are provided with equalizing passages in
the walls thereof extending longitudinally of the axes of
the couplers. Seals are provided on each coupler at the
connections between the equalizing passages to form an
isolated conduit extending from above the upper packer to
hollow plunger or piston rod 18 extends through guide
head 31 and connects to pipe 12. The interior surface
of plunger 18 is circular and the exterior surface thereof
is square. The interior of guide head 31 also is formed
square thereby providing a keyway in guide head 31
which prevents rotation of plunger 18 relative to cylin
der 19. This structure is desirable for operation of cer
tain standard test tools which require rotary motion for
operation.
below the lower packer. When employing inflatable type
packers similar sealed longitudinally extending inflate pas 60 A pipe or stringer 33 which ?uidly communicates with
sages are formed in the walls of the mandrels, couplers,
and perforated pipe sections to form an isolated conduit
a central passageway 30 formed in closure member 25 is
secured to closure member 25 and extends through piston
32 into the interior of plunger 18. Packer in?ating ?uid
for conducting packer in?ate ?uid to the packers. Re
cesses may be provided on the couplers adjacent the ends 65 34 is contained in cylinder 19. Sealing means 35 are
arranged on piston 32 adapted to seal off the annulus
of the equalizing and in?ate passages in order to insure
between piston 32 and the interior wall of cylinder 19
?uid communication between the passages when the joints
and sealing means 36 is arranged on piston 32 adapted
are made up.
to seal oil the annulus between piston 32 and the ex
Thus, one object of the present invention is to pro
terior wall of pipe 33. Sealing means 37 is arranged
vide a new and improved arrangement of apparatus for 70 in closure member 25 adjacent passageway 30 adapted
straddle-pack drill stern testing.
to seal off the annulus between pipe 33 and closure mem
This and other objects of the invention will be apparent
ber 25.
3,032,116
3
An upper packer pipe or mandrel 40 is screw-thread
edly connected to closure member 25. Mandrel 46 has
arranged thereon in?atable packer 26.
An equalizing
passage 41 is formed to extend longitudinally through
the wall of mandrel 4t) and ?uidly communicates equal
izing port 21 and the interior or bore 42 of mandrel
d
to insure ?uid communication between the various pas
sageways when the joint is made up.
The lower coupler 65 is identical in construction to
the coupler just described; however, in this instance, pas
sageway 52 ?uidly communicates with passageway 70
which, in turn, ?uidly communicates with passageway
58 and passageway 51 ?uidly communicates with passage
way 67 which, in turn, ?uidly communicates at the lower
end with passageway 56.
44 intermediate the length thereof, the latter port ?uidly
FIGS. 5 and 6 show the arrangement of the passage
communicating passageway 43 and the interior of packer 10
ways adjacent the upper and lower ends, respectively,
20. Passageway 43 ?uidly communicates the lower end
of the coupler more clearly. The valve assembly 28,
of passageway 26 with port 44 and with the bore 42 of
shown in detail in FIG. 7, is arranged in passageway 26.
mandrel 40. Closure member 25 is provided with upper
The upper portion of passageway 26 ?uidly communicates
and lower seals 45 and 46 to seal off the space between
with two oppositely disposed check valves 82 and 83
the upper end of mandrel 4-5 and closure member 25
which, in turn, ?uidly communicate with the lower por
above and below the interconnection of passageways 26
tion of ?uid passageway 26 via conduits or branch pas
and 43, respectively. An annular recess 47 is formed
sageways 84 and 85, respectively. A plug 86 is arranged
in closure member 25 adjacent the lower end of pas
40. Mandrel 46 also is provided with a longitudinally
extending packer in?ate ?uid passageway 43 and a port
in closure member 25 for facilitating positioning and ref
sageway 26 to insure ?uid communication between pas
sageways 26 and 43 when mandrel 40‘ is connected to 20 moval of valve elements 82 and 83. Sealing means 87,
closure member 25.
Pipe section 15 is screw-threadedly connected to the
lowe rend of mandrel 4d and includes at least one sec
which may be suitably O-ring seals, are provided for
sealing off the various ?ow passages.
Check valves 82
and 83 include spring members 88 and 89, respectively,
and ball members 90 and 91, respectively. Spring mem
tion of pipe Sitv provided with perforations 22 which
?uidly communicate the bore and exterior thereof. Pipe 25 ber 89 is of sufficient strength to prevent movement of
?uid from cylinder 19 through the upper portion of ?uid
50 is also provided with a longitudinally extending equal
passageway 26 to ?uid passageway 85 and the lower por
izing passageway 51 formed in the wall thereof. Pas
tion of ?uid passageway 26 when the piston is in the
sageway 51 ?uidly communicates with the bore of pipe
upper position.
‘
I
59 at its upper and lower ends. Pipe 56 is also provided
with a longitudinally extending packer ?uid in?ate pas 30 In operation, when it is desired to test the ?uids of
formation 11 setting down of weight upon drill string 12
sageway 52 formed in the walls thereof. Passageway 52
causes plunger 18 to move downwardly within cylinder
also ?uidly communicates with the bore of pipe 54} at
19. Packer in?ating ?uid 34 is thereby forced by piston
its upper and lower ends. Perforations 22 of pipe 5t) are
32 downwardly through ?uid passageway 26 through
spaced to avoid passageways 51 and 52. A lower packer
' valve 28, which valve permits downward flow through
mandrel 55 of packer section 16 is screw-threadedly con
passageway 26 when piston 32 moves downwardly and
nected to the lower end of pipe 5i}. Mandrel 55 is pro
permits ?ow of ?uid upwardly through passageway 26
vided with a longitudinally extending equalizing pas
when piston 32 is moved upwardly, through passageway
sageway 56. The lower end of passageway 56 ?uidly
43 into the interior of packer 2th through port 44 and
communicates with equalizing port 24 and the upper end
?uidly communicates with the bore 57 of mandrel 55. 40 through passageway 76, through passageway 52, through
passageway 70 of lower coupler 65, and through passage
M-andrel 55 also is provided with a longitiudinally ex
way 58 into the interior of packer 23. When packers 20
tending packer ?uid in?ate passageway 58. The lower
and 23 have expanded into engagement with the borehole
end of passageway 58 ?uidly communicates with the in
wall, formation ?uids move through perforations 22 into
terior of packer 23 and the upper end ?uidly communi
the bore of pipe 50 through the bore 66 of coupler 65,
cates with the bore of mandrel 55.
through the bore 42 of mandrel 40, through passageway
The lower end of mandrel 40, the upper end of pipe
30, through pipe 33 and plunger 18, and into the interior
50, the lower end of pipe 50, and the upper end of man
of pipe string 12. Mud pressure in annulus A above‘
dral 55 are provided with recessed portions designated
60, 61, 62 and 63, respectively. Couplers 65, shown in
packer 20 and below packer 23 is equalized through port
greater detail in FIG. 4, are arranged in these recessed 50 21, passageway 41, passageway 67 in upper coupler 65,
portions.
As seen in FIG. 4, coupler 65 is provided with a bore
66 extending therethrough and ?uidly communicating
passageway 51, passageway 67 in lower coupler 65, pas
sageway 56, and port 24.
Lifting of weight from drill string 12 permits packers
2t) and 23 to de?ate as plunger 18 is withdrawn upwardly
with the bore 50’ of pipe 5%} and the bore 42 of mandrel
40. Also, a longitudinally extending equalizing passage 55 to return the in?ate ?uid back into cylinder 19. Thus,
when weight is released from drill string 12, piston 32
way 67 terminating in spaced annular recesses 68 and 69
moves upwardly and ?uid within packer 23 is conducted
adjacent the outer surface of coupler 65 is provided in
through passageway 58, passageway 70 in lower coupler .
the wall thereof. Additionally, a longitudinally extend
65, passageway 52, passageway 70 in upper coupler 65,
ing packer ?uid in?ate passageway 76 terminating in
spaced recesses 71 and 72 adjacent the outer surface 60 passageway 43, and passageway 26 into cylinder 19 and
thereof is provided in the wall of coupler 65. Passage
way 67 ?uidly communicates at its upper end with pas
sageway 41 and the interconnection of these passageways
is sealed off by means of spaced seals 73 and 74a, respec
tively. The lower end of passageway 67 fluidly com
municates with passageway 51 and the interconnection
between these passageways is sealed olf by means of
spaced seals 76 and 77. The upper end of passageway
70 ?uidly communicates with passageway 43 and the in
terconnection between these passageways is sealed off by
means of spaced seals 74 and 75. The lower end of
passageway 70 ?uidly communicates with passageway
52 and the interconnection of these passageways is sealed
off by means of spaced seals 77 and 78, respectively.
Annular recesses 68, 69, 71, and '72 are provided in order 75
?uid within packer 20 is conducted to cylinder 19 through
port 44, passageway 43, and passageway 26.
The various seals mentioned in the description may
be suitably O-ring seals.
Although, two couplers 65 have been shown and de
scribed, one interconnecting the upper end of pipe 50
and an upper packer mandrel and the other intercon
necting the lower end of pipe. 50 and a lower packer
mandrel, it is to be understood that additional couplers
may be provided where necessary. For example, as
shown in FIG. 8, several sections of perforated pipe 50
may be desired in which case a coupler 65 may be em~
ployed at each joint. Thus, long straddle distances may
be easily accommodated by the simple procedure of as—
sembling a short perforated pipe section above, or on top
3,082,116
5
5
of the bottom packer, then inserting a coupler, then an
in?ated; a perforated pipe connected to said upper man
drel; a lower packer mandrel connected to said perforated
pipe; an in?atable packer arranged on said lower man~
drel and adapted to seal off the annulus between said
lower mandrel and said borehole wall when in?ated;
said upper mandrel, said perforated pipe, and said lower
mandrel each having a bore therethrough, a packer in?ate
other perforated section, etc.
Having fully described the nature, objects, apparatus,
and operation of my invention, 1 claim:
1. Apparatus for testing a subsurface formation pene
trated by a well bore having a pipe string arranged there
in comprising a packer in?ate pump adapted to contain
a predetermined amount of packer in?ate ?uid and con
passage, and a pressure equalizing passage; upper and
lower couplers arranged in the bores between said upper
nected to said pipe string and having a packer in?ate
passage; valve means arranged in said in?ate passage 10 mandrel and said perforated pipe and said lower mandrel
adapted to prevent ?uid ?ow downwardly through said
and said perforated pipe; each coupler having a bore
therethrough, an in?ate passage, and an equalizing pas
in?ate passage except when said ?uid is forced there
sage; said in?ate passages being in ?uid communication
through by said pump; an upper packer mandrel con
and providing an isolated conduit extending from said
nected to said pump; an in?atable packer arranged on
said upper mandrel adapted to seal off the annulus be 15 pump in?ate passage to the interiors of said packers;
and said equalizing passages being in ?uid communica
tween said upper mandrel and said borehole wall when
tion and providing an isolated conduit extending from
in?ated; at least one section of perforated pipe connected
the exterior of the upper mandrel above said upper
to said upper mandrel; a lower packer mandrel connected
packer to the exterior of the lower mandrel below the
to said perforated pipe; an in?atable packer arranged on
lower packer.
said lower mandrel adapted to seal off the annulus be
3. Apparatus as recited in claim 2 including each cou
tween said lower mandrel and said borehole wall when
pler passage terminating in a recess and said coupler
in?ated; said upper mandrel, said perforated pipe, and
being provided with seals adapted to seal off the inter
said lower mandrel, each having a bore therethrough, a
connections between the recesses and the various pas
packer in?ate passage, and a pressure equalizing pas
sage; said upper mandrel packer in?ate passage extend 25 sageways.
4. Apparatus for use in interconnecting two sections
ing from the upper exterior to the lower interior of said
of pipe, each section having a bore therethrough, a lon
mandrel and ?uidly communicating with the interior of
gitudinally extending packer in?ate passage and a longi
the packer intermediate the length thereof; said upper
tudinally extending equalizing passage comprising a con
mandrel equalizing passage extending from the upper ex
pler adapted to ?t in the bore of said pipe between the
terior above the upper packer to the lower interior of
sections thereof in order to ?uidly connect the sections
said mandrel, each of said perforated pipe in?ate and
and having a bore therethrough ?uidly connecting with
equalizing passages extending from the upper interior
said pipe bores, a longitudinally extending in?ate pas
to the lower interior of said pipe; said lower mandrel
sage and a longitudinally extending equalizing passage;
packer in?ate passage extending from the upper interior
each passage terminating at the ends thereof in an an
to the exterior intermediate the length thereof surrounded
nular recess which ?uidly communicates with the respec
by said lower packer; said lower mandrel equalizing pas
tive in?ate and equalizing passages in said pipe sections;
sage extending from the upper interior to the lower ex
and sealing means arranged above and below each recess
terior below said lower packer; upper and lower couplers
adapted to seal off the interconnections between these
arranged in the bores between said upper mandrel and
said perforated pipe and said lower mandrel and said per~ 40 passages.
5. Apparatus for use in interconnecting two sections
forated pipe; each coupler having a bore therethrough,
of pipe, each section having a bore therethrough and ?rst
an in?ate passage and an equalizing passage; the in?ate
and second longitudinally extending passages therein
and equalizing passages extending from the upper exter
comprising a coupler adapted to ?t in the bore of said
ior to the lower exterior of said coupler; each passage
terminating in annular recesses; sealing means arranged 45 pipe between sections thereof in order to ?uidly connect
the sections and having a bore therethrough ?uidly con
above and below each recess adapted to seal off the space
necting with said pipe bores and two longitudinally ex
between the exterior of the coupler and the interior of the
tending passages; one of said coupler passages terminat
pipe and mandrels; the in?ate passages in said pump,
ing at each end thereof in annular recesses, one of which
upper mandrel, upper coupler, pipe, lower coupler, and
lower mandrel being in ?uid communication and the 50 ?uidly connects with said ?rst passage in one pipe sec
tion and the other of which ?uidly connects with said
equalizing passages in said upper mandrel, upper coupler,
?rst passage in said other pipe section and said other cou
perforated pipe, lower coupler, and lower mandrel being
pler passage terminating at each end thereof in an annular
in ?uid communication whereby pressure above said
recess, one of which ?uidly connects with said second
upper packer and below said lower packer is equalized
through said equalizing passages when said packers are 55 passage in said one pipe section and the other of which
?uidly connects with said second passage in said other
in?ated by pumping ?uid through said in?ate passages.
pipe section.
2. Apparatus for testing a subsurface formation pene
trated by a well bore having a pipe string arranged there
in comprising a packer inflate pump adapted to contain
References Cited in the file of this patent
a predetermined amount of packer in?ate ?uid and hav 60
ing a packer in?ate passage and connected to said pipe
string; valve means arranged in said in?ate passage
adapted to prevent ?uid ?ow downwardly through said
in?ate passage except when said ?uid is forced there
through by said pump; an upper packer mandrel con~
neoted to said pump; an in?atable packer arranged on
said upper mandrel adapted to seal off the annulus be
tween said upper mandrel and said borehole wall when
UNITED STATES PATENTS
2,621,743
2,633,200
Johnston ___________ .._ Dec. 16, 1952
Humason ____________ _- Mar. 31, 1953
2,675,080
Williams ____________ __ Apr. 13, 1954
2,741,313
Bagnell ____________ .__.-Apr. 10, 1956
2,793,524
2,806,539
Badger _____________ __ May 28, 1957
Green et al ___________ __ Sept. 17, 1957
2,813,587
Mounce ____________ __ Nov. 19, 1957
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