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Патент USA US3053332

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Sept. 11, 1962
c. B. WRIGHT, JR., ETAL
3,053,323
RETRIEVABLE; GAS LIFT APPARATUS
Filed Aug. 3l, 1959
4 Sheets-Sheet 1
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Sept. 11, 1962
c. B. WRIGHT, JR., ETAL
3,053,323
RETRIEVABLE GAS LIFT APPARATUS
Filed Aug. 31, 1959
4 Sheets-Sheet 2
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INVENTORS
Sept. 1l, 1962
c. a. WRIGHT, JR., ETAL
3,053,323
RETRIEVABLE: GAS LIFT APPARATUS
Azrae/vsx
tent
Patented Sept. Ill, 1962
2
3,053,323
Charles I3. Wright, Jr., and Mason M. Lilly, Houston,
IIE'I'RIE‘VABLE GAS LIFT APPARATUS
Tex., assignors, hy mesne assignments, to Harold
Brown Company, a corporation of Texas
Filed Aug. 31, 1959, Ser. No. 837,029
12 Claims. (Cl. 166~-224)
of the anchoring apparatus of FIGURE 2 taken at line
3_3 of FIGURE 2,
FIGURE 4 is a vertical sectional view of the anchoring
apparatus shown in FIGURE 2, the slips being shown in
engaged position,
FIGURE 5 is a vertical sectional view of one type of
gas lift valve which may be used in the apparatus of
this invention,
This invention relates to apparatus including a gas lift
FIGURES 6A, 6B, and 6C together comprise a ver
valve insertable into and retiie‘vable from oil well tubing 10 tical sectional view of one embodiment of the packoff
without removing the tubing from the well. The inven
and gas admission portion of the apparatus of this in
tion provides apparatus slidable within the well tubing
vention, and
and responsive to action initiated at the surface to lock
FIGURE 7 is a horizontal sectional view of the novel
detent means shown in FIGURE 6A, taken at line 7_7
ing means are provided which are readily set at a desired 15 of FIGURE 6A.
location within the well tubing.
FIGURE 1 shows the entire tool string itl as it is
itself into place at any desired depth. In addition, seal
In the production of so-called non-flowing oil wells,
positioned in a string of tubing I2 inside well casing I4.
those in which the natural pressure on the subsurface
liquids is insufficient to litt them to the surface, a
The retrievable gas lift apparatus is lowered on the end
means ordinarily does not arise until some time after the
Expander cone 26 has a threaded axial bore Btl into
of a wire line, and comprises anchoring apparatus I6,
technique of artificial lifting by gas pressure has been 20 a gas lift valve I8, a packoff and gas admission assembly
developed. This method of production requires the use
2li, and a bottom stop assembly Z2. Generally a check
of one or more gas lift valves positioned at appropriate
valve 24 is also included in the assembly.
Referring now to FIGURE 2, the anchoring apparatus
elevations within the well to admit gas under pressure
I6 comprises an upwardly and inwardly tapered expander
into the tubing from the annulus between the well casing
and tubing. The need for such artiiicial production 25 cone 26 on which slip segments 28 are adapted to ride.
well has been placed in operation, and the adaptation oi
the well tubing for gas lift production has heretofore
which socket head cap screws 32 and 34 are screwed.
Between the head 36 of cap screw 32 and the small end
necessitated several time-consuming operations. For ex
of expander cone 26 a shouldered sleeve 3S extends. It
ample, it is necessary with current gas lift apparatus to 30 will be appreciated that sleeve 38 and cap screw 32 may
interpose gas litt valve mandrels or special sections of
tubing throughout the string. These manndrels provide
be unitary, and that the embodiment shown is used for
economy in manufacture. The combination of elements
points of attachment for gas lift valves, and also provide
prepared openings through which the valves may intro
26, 32, 34, and 38 comprise a body member for the
anchoring apparatus. A fishing neck 40 is slidably re
duce gas into the tubing. As such mandrels form a part
`of the tubing string, it is necessary to make up the assem
tained on sleeve 3S by shoulder 42.
Fishing neck 40 has
an end collar 44 for engagement with a conventional wire
bly at the well head as the string is assembled.
line iishing tool.
The present invention contemplates the elimination of
Slip segments 28 each have an internal longitudinal
much of the preparatory work necessary for introduction
dovetail slot 46, which engages a screw head 48 on ex
of gas lift apparatus, it being necessary only to lower the 40 pand-er cone Z6. The upper end of each slip segment
is formed with an outwardly extending T Si). Fishing
self-anchoring gas lift device to the vicinity of a perfora
tion in the production tubing already in the well, and
lock it into position.
neck 40 has an enlarged lower end 52 and a transverse
T-slot 54 in its lower Íace for engagement of the T 50
Accordingly, it is an object `of this invention to provide
on the upper end of each slip segment. ~A shear pin 56
a self~anchoring gas lift device which may be secured 45 extends transversely across iishing neck 4@ above head
at a desired point in the tubing of a subsurface well.
36 of cap screw 32 to retain the slips in unexpanded
It is a further object to provide a self-anchoring gas
position while lowering the tool into the hole.
`Cap screw 34 is adjustably secured to expander cone
lift device which may be operated from the surface to
26 by jam nut 58. Slip release body 6I) is slidably fitted
lock itself at a desired point within a well, and which
subsequently may be released and removed by a surface 50 around the shank of cap screw 34 and encloses its head
initiated action.
62. A sub 64 provides means for attachment of other
Another object is to provide a self-anchoring gas lift
device having spaced seals for sealing above and below
an aperture in the well tubing.
Still another object is to provide apparatus for sup
tools. A shear pin 66 extends transversely of slip release
body 60 below the head 62 of cap screw 34.
FIGURE 2 shows the slips in collapsed position. To
55 expand the slips into engagement with the bore of the
porting a gas lift valve within a tubing string at a desired
tubing, as shown in FIGURE 4, a sharp blow or jar is
point and for introducing gas and well liquid to the valve.
Yet another object is to provide an improved sealing
applied to collar 44 of fishing neck 40, thereby shearing
device for well tools.
Another object is to provide improved anchoring ap
paratus for anchoring Well tools inside a well conduit.
These and other objects of this invention will become
more apparent upon consideration of the following de
scription and the attached drawings, wherein
FIGURE l is a view of one embodiment of the ap
paratus of this invention supporting a gas lift valve inside
shear pin 56 and allowing slip segments 28 to move
downwardly and outwardly on expander cone 26 into
60 engagement with the tubing. Screw head 48 in dovetail
slot 46 guides the slip segments into proper alignment with
the tubing bore to insure that the slip segments contact
the tubing solidly.
As shown in `FIGURE 5, gas lift Valve I8 is attached
65 to the lower end of sub 64. The gas lift valve shown and
described herein is merely a preferred type, it being ap
parent that other designs may also be used. In this pre
Íerred embodiment, a spring housing 63 is threadedly at
FIGURE 2 is a vertical sectional view of one embodi
tached to sub 64, an O-ring ’70 being used to provide a
ment of the anchoring apparatus of this invention, the 70 seal at the threaded connection. Spring housing o8 is
slips being shown in released position,
in turn threadedly attached to a barrier member 72,
FIGURE 3 is a horizontal sectional view of a portion
0~ring '74 providing a seal at this connection. Valve
a string of tubing in a well bore, the tubing, casing, and
well being shown in vertical section,
4
r
housing 76 is threadedly attached to the barrier member
they become deformed. By enclosing the small end of
72, and in turn attached to a check valve 24 therebelow.
the cup on three sides, and providing an O-ring seal be
Valve housing 76 has a gas inlet bore 80 forming an in
tween the cup and the body, these deficiencies of the prior
ternal shoulder 82. A removable valve seat 84 is posi
art seals are eliminated.
tioned against this shoulder, an O-ring 86 forming a seal Ul
The ends 134 of sleeve 113 are tapered, thereby pro
between the valve seat and the bore 88 of the Valve hous
viding expansion means for the corresponding seal units
ing 76. Gas outlet apertures 89 are provided in the wall
120. The tapered ends ‘134 are releasably retained out
of the valve housing just above valve seat 84. A ball
of engagement with seal units 120 by yieldable means be~
valve 90 is adapted to seal against valve seat 84 and close
tween the ends of sleeve 113 and the upper and lower
off gas inlet bore 80. Ball valve 90 is attached, as by
bodies, which means resist movement of the bodies
welding, to valve rod 92, which in turn is threadedly at
toward each other. The yieldable means includes a plu~
tached to head 94. Head 94 comprises an enlarged por
rality of detents 136, which may be of the spherical form
tion of upwardly extending push rod 96. On the upper
shown, which are positioned in apertures 138 substan
end of head 94 the lower end of a bellows 98 is sealingly
tially equally spaced circumferentially around each of
attached, surrounding push rod 96. The upper end of
the sleeve sections. A band-shaped spring 140 lies in a
bellows 98 is sealingly attached to barrier member '72.
Push rod 96 extends upwardly through axial bore 160 in
barrier member 72 and terminates in a reduced diameter
102. A spring washer 104 slidingly engages reduced di
ameter 102 of push rod 96, and the lower end of a com
circumferential groove 142, surrounding and retaining de
tents 136, and biasing them radially inwardly. The ends
of the spring are spaced apart, `as shown in FIGURE 7,
and a pin 144 between the ends prevents the spring from
moving circumferentially around the sleeve on which it
is mounted.
pression spring 106 bears against the spring washer. The
upper end of spring 106 bears against adjusting nut 108
threadedly engaged in the bore of spring housing 68.
Iam nut 110 locks the spring nut in place.
A gas lift valve shown and described herein is of the
The detents 136 are biased radially inwardly against
the bottom of a groove 146 circumscribing each body
112, 118. One wall 148 of the groove 146 is bevelled out
so-called “fluid-operated” type, i.e., the opening of the
f to a reduced diameter portion 150, the depth of groove 146
on this side being less than the radius of detent 136, so
valve to admit gas is governed by the pressure of the
well fluid on the valve, as opposed to “gas-operated”
that axial force will cause detents 136 to expand spring
valves, which `are opened by gas pressure.
portion 150.
Reduced diameter portion 150 provides a circumfer
ential passageway 152 between body 112 and sleeve 113.
Apertures 1‘54 in sleeve 113 communicate outwardly
therefrom into the space between seal units 120, and
aperture 156 communicates inwardly therefrom. Aper
140 and move out of groove 146 onto reduced diameter
The use of a
ñuid~operated valve is highly advantageous, since it opens
only when a predetermined head of fluid is above the
valve, thus reducing considerably the amount of gas used
in the gas lift operation.
Below gas lift valve 18 a check valve 24 to allow flow
vertically upwardly therethrough but prevent flow down
ture 156 forms the lower end of a gas conduit 158, which
wardly, is generally provided. Such valves are well known
extends upwardly therefrom into sealing engagement with
the upper end of body 112, thereby communicating with
in the art, so that no detailed description is necessary
here. This check valve prevents back flow of well fluid
check valve 24.
into the annulus between the tubing and the casing.
Apertures 160 in body 112 just above upper seal unit
120 provide communication between the interior of the
packoif and gas admission assembly and the well tubing
above this assembly, so that well fluid may flow upwardly
Referring now to FIGURES 6A and 6B, it will be seen '
that the packoff and gas admission assembly 20 is thread
edly attached to the lowel end of check valve
This
assembly comprises an upper hollow body 112, a slidably
mounted sleeve 113 comprising upper and lower sleeve
sections 114 and 116, and a lower hollow body 118. It W. Ot
is apparent that sleeve 113 could be made unitary, but
the structure shown is preferred because it allows a wider
range of applications of the tool, as will become apparent
therethrough.
edge of the cup member is spaced outwardly of the body.
units and tubing 12.
Reduced diameter portion 150 in lower body 118 pro
vides a circumferential passageway 153 between body 118
and lower sleeve section 116. An aperture 15S in sleeve
section 116 communicates outwardly from passageway
153 into the space between seal units 120. When the tool
hereinafter. 0-rings 119 provide sealing engagement of
is set in position, as hereinafter described, and gas pres
the sleeve sections and the body members.
50 sure is applied to the annulus between the seals 120, this
Surrounding each upper body 112 and lower body 118
gas is allowed to ilow through apertures 154 and 155 into
is an annular expansible seal unit 126. Each seal unit
circumferential passageways 152 and 153, and then to
comprises an annular ñexible cup member 122 and an
pass between sleeve section 114 and upper body 112,
annular restraining shell 124. Restraining shell 124 has
and between sleeve section 116 and lower body 118, to
a U-shaped cross-section, within which one edge of the UY CH assist in the expansion of seal units 120 and thereby result
cup member 122 is fitted in tight engagement. The other
in increased contact and better sealing between the seal
In the bottom of the U Iare `a plurality of small apertures
126 which are provided to allow flow of air and other
Attached to the lower end of lower body 118 and ex
tending downwardly therefrom is a bottom stop assembly
gasses from shell 124 during fabricating and molding of (30 comprising stop assembly body 162 having a reduced
the seal unit, so that no voids are left in the shell. Cup
diameter 164 intermediate its ends. A collar 166 is slid
member 122 is made of a flexible, resilient oil-resisting
ably mounted on reduced diameter 164 and supports one
material, such as Hycar or sirnil-ar synthetic rubbers.
Seal unit 120 is retained on each of bodies 112 and
118 between an annular shoulder 126 and snap ring 12S.
A backup ring 130 is also provided to give full support
to shell 124 of seal unit 120. An O-ring 132 provides a
seal between each seal unit and its corresponding body
to prevent leakage therethrough.
end of each of a pair of resilient dog arms 168, each of
_ which has a dog 170 on its lower end. A dog retainer
spring 172 is pivotably attached to each of the dogs 170.
In operation, the well tubing is first perforated at 174
above any desired tubing collar 176 (FIGURE 6).
The apparatus of this invention is then assembled in
The usual unrestrained sealing cups have not been 70 the order shown in FIGURE 1, and lowered into the tub
ing string on a wireline, by means of a conventional over
found satisfactory `for this service, because gas pressure
between the seals forces the inside surface of the seal
away from the body, thereby allowing leakage past the
seal. In addition, the synthetic rubbers usually used,
shot. While lowering, each dog retainer spring 172 is
secured around the opposite dog 170, and collar 166 is
adjacent the lower end of reduced diameter 164, so that
bein; incompressible, will flow under pressure, so that 75 resilient dog arms 168 are held inwardly and dogs 170
3,053,323
5
6
are retained out of engagement with the bore of the well
tubing.
When the lower end of the tool passes tubing collar
176 just below perforation 174, downward movement is
stopped, and the tool is pulled upwardly so that the ends
of springs 172 engage the tubing end within collar 176.
Upon further upward movement, springs 172 are pushed
olf the dogs, which are thereby released.
The tool is
then moved downwardly again until the dogs engage the
recess between the tubing ends. The overshot is then
released and a bumper sub or other jarring means used
to drive downwardly on collar 44 of fishing neck 4t). The
A preferred embodiment of this invention has been
shown and described herein. Many modilications thereof
will be apparent to those skilled in the art, therefore the
invention is not limited to the preferred embodiment, but
only as set forth by the following claims.
We claim:
1. Gas lift apparatus insertable into and retrievable
from a well tubing string comprising tubular upper and
lower bodies, a sleeve slidably connecting said upper and
10 lower bodies in longitudinally movable spaced relation
ship, means intermediate said sleeve and each of said
upper and lower bodies for limiting relative longitudinal
jarring action causes detents 136 to be disengaged from
movement therebetween, means carried by the lower body
cooperable with the well tubing string tot stop downward
grooves 146, so that the tapered ends 1134 of sleeve 11‘3
slide into engagement with the inside of seal units 120 to 15 movement of the apparatus, a resilient, expansible seal
expand cups 122 outwardly and seal oiî the space between
carried about each of said upper and lower bodies, ta
the seal units.
pered cam means on said sleeve adapted to expand said
Additional jarring then shears shear pin 56, causing slip
seals radially outward into engagement with said well
segments 28 to slide down expander cone 26 and engage
tubing in response to relative longitudinal movement of
the bore of the tubing. These slips are necessary to 20 said bodies in one direction, a tirs-t aperture in the wall
prevent well pressure from blowing the tool out of the
of said upper body in communication with the space
Well. The tool is now ready for operation.
between said seals, a conduit communicating between
Generally a number of tools of this invention will be
fthe upper end of said upper body and said first aperture,
placed in a tubing string, the lowest tool being placed
a second aperture in the wall of said upper body above
below the surface of the well fluid in the tubing, and 25 the seal about said upper body, a gas lift valve above
other positioned at intervals thereabove. Natural gas
said upper body, conduit means connecting the upper end
or air under pressure is fed down the annulus between
of said upper body to said gas lift valve, and anchoring
the tubing and the casing, passes through aperture 174
means mounted on the upper body insertable into said
in the tubing, through apertures 154 in sleeve 113, and
well tubing string adapted -to anchor all the aforesaid
through gas conduit 158 and check valve 24 to -gas inlet 30 apparatus to prevent vertical movement in the tubing.
bore 80 of gas lift valve 18. The valve spring adjusting
2. Gas lift apparatus as Idefined by claim l wherein said
nut 108 has been adjusted to put suñicient tension on
anchoring means comprises an anchor body attached to
spring> 106 to prevent gas pressure alone from opening
the upper end of the gas lift valve, an upwardly and in
valve 90.
wardly tapered surface on said anchor body, -a longitudi
Well fluid rises, under formation pressure, through stop 35 nally slidable tubular member carried about said anchor
assembly body 162, lower body 118, sleeve 113, and upper
body above said tapered surface, and anchor slips longi
body 112, and passes to the annulus between the tubing
tudinally slidably engaged with said tapered surface and
and the tool through apertures 160; The well fluid con
carried by said tubular member and radially movable rela
tinues to rise to some point above gas outlet apertures
tive thereto in response to longitudinal movement along
S9 of the lowest gas lift valve. The pressure exerted by 40 said tapered surface.
this head of well tluid against head 9‘4 and bellows 98 of
3. Gas lift apparatus insertable into and retrievable
the gas lift valve causes the valve to open. The setting
from a well tubing string comprising a packoiï and gas
of spring adjusting nut 108 determines the head of well
admission assembly, said assembly comprising tubular
ñuid required to open valve 90‘. When the valve is
upper and lower bodies, a sleeve slidably connecting said
opened, a surge of gas flows through and out apertures
upper and lower bodies in longitudinally movable spaced
89 and raises the fluid in the well to the next higher valve,
relationship, means intermediate said sleeve and each of
where the process is repeated.
said upper and lower bodies for limiting relative longitu
When it is desired to remove the tool from the well,
dinal movement therebetween, means carried by the lower
a sharp blow is delivered to the head 36 of cap screw 32.
The force of this blow is transmitted through expander
cone 26 and cap screw 34 and shears shear pin 66, there
by allowing expander cone 26 to move downwardly and
body `cooperable with the well tubing string to stop down
ward movement of said pack-olf assembly, a resilient,
expansible seal carried about each of said upper and
lower bodies, and tapered cam means on said sleeve and
free slip segments 28. An overshot is then engaged with
adapted «to expand each of said seafls radially outward into
collar 44 and an upward force exerted. Upper body 112
engagement ywith said lwell tubing in response to relative
of packoiî and gas admission assembly is thereby moved 55 longitudinal movement of said bodies in one direction,
upwardly, disengaging tapered sleeve end 134 from upper
whereby a packed-oit annulus is formed exteriorly of said
cup 122 so that the cup is allowed to contract, and de
sleeve; a gas lift valve attached to said packoff and gas
tents 136 snap into groove 146. -Further pulling similarly
admission assembly; and means in said assembly com
releases the lower seal unit, and pulls dogs 170 out of
munication between said packed-olf annulus and said gas
engagement at the tubing collar. Thus the entire tool, 60 lift valve.
including the stops, may be pulled with one continuous
4. Gas lift apparatus as deñned by claim 3 and includ
motion.
-ing yieldable means between said sleeve and each of said
The various novel components of the apparatus just
upper and lower bodies adapted to resist movement of
described obviously have many applications other than in
said bodies in said one direction.
conjunction with gas lift valves. For example, by omis
5. Gas lift apparatus as deiined by claim 3 wherein each
sion of the gas lift valve and addition of another lower 65 said resilient, expansible seal comprises a llexible cup
packoif assembly, a tubing patching tool is obtained.
The use of a sectional sleeve allows the insertion of a
conduit section of any desired length to encompass a se
member and an vannular shell having a U-shaped cross
section enclosing one edge of said cup, and an 0-ring
seal between each said shell and the corresponding tubular
ries of perforations in the well tubing. The particular 70 body.
stop assembly used is attached to the tool, whereby it may
be lowered and ñxed into position when the tool is low
ered into the well, and may be pulled out of the well
6. Gas lift apparatus as deñned by claim 5 and includ
ing yieldable means between said sleeve and each of said
upper and lower bodies adapted to resist movement of
along with the tool, so that it is not necessary to make a
said bodies in said one direction.
second run into the well to position or retrieve the stop. 75 7. Gas lift «apparatus as deíined by claim 6 and includ
3,053,323
8
ing a lower stop member attached to said lower body and
from a well tubing string comprising anchoring apparatus
adapted to be lowered into said well tubing string along
at the upper end of said gas lift apparatus for anchoring
with said apparatus and to be set to prevent downward
movement of said lower body and removable with said
apparatus, and anchoring means attached to said gas lift
valve adapted to be set to prevent upward movement of
said gas lift apparatus in said well tubing against upward
said apparatus.
8. Gas lift apparatus as defined by claim 7 wherein said
anchoring means comprises an anchor body att-ached to
the upper end of the gas valve, an upwardly and inwardly
tapered surface on said anchor body, a longitudinally slid
able tubular member carried about said anchor body above
said tapered surface, and anchor slips longitudinally slid
ably engaged with said tapered surface and carried by
movement relative thereto, a gas lift valve attached to
said anchoring apparatus, a packofî and gas admission
assembly attached to said glas lift valve, and a bottom stop
assembly attached to said packofî and gas admission as
sembly for anchoring said packoff and gas admission as
sembly in said well tubing against downward movement
relative thereto; wherein said anchoring apparatus com
prises a body member having an upper head portion, an
upper shank portion, an upwardly tapering expander cone
said tubular member and radially movable relative there
to in response to longitudinal movement along said ta
portion, a lower shank portion, and a lower head por
tion, a fishing neck slidably retained on said upper shank
portion by said upper head portion, said fishing neck ex
tending upwardly beyond said upper head portion, a shear
pered surface.
pin extending transversely of said fishing neck above said
9. Anchoring means comprising an anchor body hav
upper head portion, a transverse T-slot in the lower end
ing an upper end and a lower end, an upwardly and in
of said fishing neck, a plurality of slip segments carried in
wardly tapered surface on said anchor body, a longitu
dinally slidable tubular member carried about said anchor
said T-slot, and extending downwardly therefrom and
body above said tapered surface, anchor slips carried by
overlying said expander cone portion and adapted to be
moved radially relative thereto in response to downward
said tubular member and radially movable relative there
movement of said fishing neck with respect to said ex
to in response to longitudinal movement of said tubular
means on said `anchor body limiting the relative longitu
dinal movement of said slip release body, `and a shear
pander cone portion, a hollow releasing body longitu
dinally slidable on said lower shank portion and extending
below said lower head portion, a shear pin extending trans
versely of said releasing body below said lower head por
tion and adapted to be sheared by said lower head portion
body in a setting direction, a slip release body slidably
mounted on said anchor body below said tapered surface,
pin in said slip release body adapted to be sheared upon
upon relative downward movement thereof, and means on
movement of said anchor body in a releasing direction.
l0. Anchoring means for resisting upward movement
said releasing body for connection to said gas lift valve;
and wherein -said packoff and gas admission assembly com
of a well tool supported in a well conduit- comprising a
prises tubular upper and lower bodies, conduit means
connecting the upper end of said upper body to said gas
lift valve, a sleeve slidably connecting said upper and
body member having an upper head portion, an upper
shank portion, an upwardly tapering expander cone por
tion, a lower shank portion, and a lower head portion, a
fishing neck slidably retained on said upper shank portion
by said upper head portion, said ñshing neck extending
upwardly beyond said upper head portion, a shear pin
extending transversely of said fishing neck above said
lower bodies in longitudinally movatble spaced relation
ship, means intermediate said sleeve and each of said
upper and lower bodies for limiting relative longitudinal
movement therebetween, a resilient, expansible seal car
ried about each of said upper and lower bodies, tapered
upper `head portion, a transverse T-slot in the lower end
cam means on said sleeve adapted to expand said seals
of said lfishing neck, a plurality of slip segments carried
radially outwardly into engagement with said Well tubing
in said T-slot, said slip segments extending downwardly
in response to relative longitudinal movement of said
therefrom and overlying said expander cone portion and
adapted to be moved radially relative thereto in response
to downward movement of said ñshing neck With respect
to said expander cone portion, a hollow releasing body
longitudinally slidable on said lower shank portion and
extending below said lower head portion, a shear pin ex
bodies toward each other, cooperating gas apertures in
tending transversely of said releasing body below said
lower head portion and adapted to be sheared by said
`lower head portion upon relative downward movement
thereof, `and means on said releasing body for connection
to said well tool.
11. An expansible seal unit comprising a ñexible annu
lar cup member, means within said cup member for eX
said sleeve and in said upper body, a gas conduit commu
r nicating between the aperture in said upper body and the
4upper end of said upper body, a well ñuid aperture in the
upper body `above the seal therearound and communicat
ing between the interior of the upper body and the in
terior of the well tubing surrounding and above said upper
body, and means on said lower body for attaching said
bottom stop assembly.
References Cited in the file of this patent
UNITED STATES PATENTS
panding one edge of said cup member, an annular shell
1,707,659
Hall _________________ _- Apr. 2', 1929
having a U-shaped cross-section enclosing the other edge
1,842,116
Rasmussen _____________ __ Jan. 9, 1932
of said cup member, a plurality of apertures in the closed
end of the shell, and circumferential sealing means on
the inside circumference of said shell.
12. Gas lift apparatus insertable into and retrievable
2,452,430
2,697,988
2,869,568
Clark et al ____________ __ Oct.
Stewart _____________ __ Dec.
McCarvell et al. _______ __ Jan.
Wall et al _____________ .__ Ian.
2,922,477
26,
28,
20,
26,
1948
1954
1959
1960
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