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Патент USA US3024855

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March 13, 1962
3,024,845
M. B. CONRAD
APPARATUS FOR SETTING PACKERS IN WELL BORES
Filed Oct. 1, 1957
Fine, 1
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INVENTOR.
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March 13, 1962
M. B. CONRAD
3,024,845
APPARATUS FOR SETTING PACKERS IN WELL BORES
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March 13, 1962
M. B. CONRAD
3,024,845
APPARATUS FOR SETTING PACKERS IN WELL BORES
Filed Oct. 1, 1957
5 Sheets-Sheet 5
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March 13, 1962
M. B. CONRAD
3,024,845
APPARATUS FOR SETTING PACKERS IN WELL BORES
Filed Oct. 1, 1957
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INVENTOR.
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BY
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Maréh 13, 1962
M. B. CONRAD
3,024,845
APPARATUS FOR SETTING PACKERS IN WELL BORES
Filed Oct. 1, 1957
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N ENTOR.
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BY
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United States Patent 0 See
1
3,024,845
Patented Mar. 13, 1962
2
FIG. 7 is a cross-section on an enlarged scale taken
3,024,845
APPARATUS FOR SETTING PACKERS
IN WELL BORES
Martin B. Conrad, Downey, Calif., assignor to Baker
Oil Tools, Inc., Los Angeles, Calif., a corporation of
California
Filed Oct. 1, 1957, Ser. No. 687,404
20 Claims. (Cl. 166-123)
along the line 7-7 on FIG. 3;
FIG. 8 is a cross-section on an enlarged scale taken
along the line 8-8 on FIG. 3a;
FIG. 9 is a cross-section on an enlarged scale taken
along the line 9-9 on FIG. 3a;
FIG. 10 is a cross-section on an enlarged scale taken
along the line 10-10 on FIG. 3b;
FIG. 11 is a fragmentary longitudinal section on an
The present invention relates to subsurface well appa 10 enlarged scale illustrating a portion of the jarring mecha
ratus, and more particularly to apparatus for setting
nism, the mechanism being in a set condition;
FIG. 12 is a view similar to FIG. 11 illustrating the
similar conduits in a well bore.
portion "of the jarring mechanism in a released condition;
Substantial rig time can be saved in running and setting
FIG. 13 is a view similar to FIG. 11 illustrating the
a well packer in a well bore through the use of wire line 15 portion of the jarring mechanism in an initial stage of
packers, such as bridge plugs, in well casings, liners, and
equipment.
Where setting of the packer is controlled
its resetting;
electrically, an expensive electric line is required, as well
as costly surface equipment used in connection therewith.
When the wire line is non-electric, such as a sand line, it
has been di?icult to impose sufficient setting force on the
packer without subjecting the wire line to undue strains.
Accordingly, it is an object of the present invention to
FIG. 14 is a view similar to FIG. 11 illustrating the
portion of the jarring mechanism in a reset or relatched
condition preparatory to being held in such condition.
subjecting the wire line to high strains.
Another object of the invention is to provide wire line
the bridge plug. The setting mechanism itself includes
panying and forming part of the present speci?cation. It
lower expander 16 releasably and slidably mounted with
respect to the body. The lower slips 12 are releasably
secured to the lower expander 16 by shear screws 17,
whereas the lower expander is releasably secured to the
The apparatus illustrated in the drawings is designed
primarily for setting a well packer, such as a bridge plug
A, in a well casing B. The bridge plug is lowered in the
provide wire line operated apparatus for properly setting
well ‘casing by means of a running-in string, such as a
a well packer, or the like, in a well bore without requir
wire line C, connected to the upper end of a setting tool
ing the use of electrically conductive lines and without 25 or mechanism, which is, in turn, releasably connected to
a control and setting unit or apparatus D releasably at
operated apparatus for setting a well packer in a well bore
tached to the bridge plug A, this control and setting unit,
through the aid of a non-conductive wire line, in which
in turn, being secured to a wire line jar E which supplies
the packer and the wire line operated apparatus can be 30 the motivating vforce for setting the bridge plug. The wire
removed from the well bore at any time prior to actual
line jar E, in turn, is secured to a sinker bar F releasably
setting of the well packer.
attached to a wire line or rope socket G, to which the
A further object of the invention is to provide wire line
lower end of the wire line C is ?rmly attached.
operated apparatus for setting a well packer in a well
The well packer A, disclosed herein as a bridge plug,
bore, which is relatively economical to manufacture and 35 may assume any desired form. As illustrated, it includes
easier to maintain in proper operating condition.
a tubular central body 10 having a lower guide 11 secured
This invention possesses many other advantages, and
thereto. A set of lower segmental slips 12 rest upon the
has other objects which may be made more clearly appar
lower ?ange 13 of the body, these slips having inner sur
ent from a consideration of a form in which it may be
faces 14 tapering in a downward and inward direction
embodied. This form is shown in the drawings accom 40 coacting with a corresponding tapered surface 15 on a
will now be described in detail, for the purpose of illus
trating the general principles of the invention; but it is
to be understood that such detailed description is not to
be taken in a limiting sense, since the scope of the inven 45 body 10 by one ‘or more shear screws 18.
tion is best de?ned by the appended claims.
Referring to the drawings:
A packing
sleeve 19 surrounds the body, its lower end engaging or
being secured to the lower expander 16, and its upper end
FIGURES l and 1a together constitute a side eleva
engaging or being secured to an upper expander 20‘ re
tional view of an apparatus embodying the invention dis
leasably secured to the body ‘by one or more shears 21
posed in a well casing, with the parts in condition for 50 and slidable relative thereto following disruption of such
moving the apparatus in the well casing, FIG. la: consti
shear screws. This upper expander 20‘ has an outer ex
tuting a lower continuation of FIG. 1;
pander surface 22 tapering in an upward and inward
FIG. 2 is a diagrammatic'view of the control track or
direction and engageable with companion inner tapered
slot and pin for determining operation of the apparatus
‘surfaces 23 ‘on separate upper segmental slips 24, which
55 are initially secured in retracted position to the upper
in the well casing;
FIGS. 3, 3a and 3b together constitute a longitudinal
expander by shear screws 25.
section through well apparatus disposed in a well casing,
The well packer A is set by moving the body 10 of
drawn on an enlarged scale, with the parts in the relative
the tool upwardly within the parts that surround it,
positions disclosed in FIGS. 1 and la, FIG. 3a constitut
the upward movement of the upper slips 24 being pre
ing a lower continuation of FIG. 3, and FIG. 3b consti
vented by the control and setting ‘mechanism D. Sul?
tuting a lower continuation of FIG. 3a;
cient upward force exerted on the body, in the manner
FIG. 4 is a longitudinal section of the lower portion
described hereinbelow, will cause the upper slip screws
of the apparatus disposed in the well casing and condi
25 to be disrupted, the lower slips 12, lower expander 16,
tioned for setting of the well packer in the well casing;
packing sleeve 19 and upper expander 20 moving u FIGS. 5, 5a and 5b together constitute a longitudinal 65 wardly with the body to wedge the upper expander 20
section corresponding to FIGS. 3, 3a and 3b, respectively,
behind the upper slips 24 and shift the latter radially out
illustrating the condition of the apparatus after setting of
ward into anchoring engagement with the wall of the well
the well packer in the well casing and release of the set
casing B. A continuation of the upward force on the
ting tool therefrom;
body will then shear the screws 21 and move the lower
70
FIG. 6 is a cross-section on an enlarged scale taken
expander 16 toward the upper expander 20, foreshorten
along the line 6-6 on FIG. 3;
ing the packing sleeve 19 and expanding it laterally into
8,024,845
3
4
?rm sealing engagement with the wall of the well casing
and the periphery of the body itself. Further upward
movement of the body 10 will then disrupt the screws
18, 17 holding the lower expander 16 to the body and the
lower slips 12 to the lower expander, causing the slips 12
to shift upwardly along the lower expander 16 and radially
outward into anchoring engagement with the well casing.
sicn rod ‘has an upwardly facing shoulder 52 thereon
adapted to engage the lower end of the nut 50 after the
‘setting tool D has been released from the bridge plug A,
in order that upward movement of the rod 30 can be
transferred to the control member 48, shifting the latter
in an upward direction relative to the expander 40.
The split control expander 40 is adapted to coa-ct with
A su?‘icient upward force is exerted on the body 10 to
segmental setting slips 53 disposed around the control
insure the ?rm compression of the packing sleeve 19 be
member or mandrel 48 for the purpose of preventing up
tween the expander 20, 16 and its sealing engagement 10 ward movement of the setting sleeve 38 relative to the
with the wall of the well casing B and the periphery of
well conduit or casing B. These slips 53 are mounted
the body, ‘as well as the ?rm anchoring of the slips 24,
in circumferentia-lly spaced slots 54- in a slip ring 55,
12 against the wall of the well casing. The parts are
and are coupled against longitudinal movement with re
held in the positions just referred to by preventing rela
spect to each other by a retaining ring 56 encompassing
tive downward movement of the body 10 after the up 15 the slips and disposed in grooves 57 in the slip members,
wardly directed force has been removed, as by providing
this ring being adapted to engage a lower flange 58 of the
a split lock ring 27 in an internal groove'28 in the upper
slip ring to prevent downward movement of the slips
expander 20, which will engage one of the downwardly
53 relative to the slip ring 55.
Upward movement of
facing circumferential ratchet teeth 29 formed in the
the slips ‘53 with respect to each other is prevented by
periphery of the body. The lock ring 27 and the ratchet 20 their engagement with the lower end of a guide 59 slid
teeth 29 will permit upward movement of the body 10
ab'ly mounted on the control mandrel 48, this guide being
relative to the lock ring and the upper expander 20, but
suitably attached to the slip ring, as by means of one or
downward relative movement of the body is precluded.
‘more longitudinally extending screws 60. The upper end
The setting tool D, E is utilized to effect anchoring
61 of the guide 59 is tapered in an upward and inward
of the well packer in packed-off condition within the Well 25 direction to prevent the slip structure from hanging up
casing, such tool imposing an upward directed force on
on casing collar recesses, and the like, in the string of
the body 10 and reactively imposing a downwardly di
well casing B.
l
rected force on the upper set of slips 24, as by preventing
The slip members 53 are of a composite type, includ
upward movement of the latter. The upwardly directed
ing lower gripping portions 62 having inner surfaces 63
force on the body is transmitted through a tension man
tapering in an upward and inward direction and adapted
drel or rod 30 which projects into the body passage 31,
to be engaged by the control expander. 40, which will
and which is secured to the body through the agency of
urge the gripping portions 62 into anchoring engage
a releasable stud 32 threaded into the lower end of the
ment with the wall of the well casing B to prevent their
rod 30 and into a plug 33 threadedly secured to the body
upward movement therealong. The slips 53 also include
10, in order to close the passage 31 therethrough. The 35 upper drag portions 64 frictionally engageable with the
stud has an intermediate reduced diameter portion 34 at
wall of the well casing, such frictional engagement re
which the stud will be disrupted when subjected to a pre
sulting from outwardly directed force exerted by helical
determined tensile strain.
compression springs 65 disposed in each slot 54 ‘and hear
ing ‘against the base of each slot and against the base of
The'mandrel 30 extends upwardly to a substantial ex»
tent above the upper end of the body 10, its upper end 40 slip sockets 66 in which the springs are disposed. The
being threadedly secured to a sub 35, which is, in turn,
slip members 53 are rockable on the wall of the well
threadedly attached to the lower housing portion 36 of
casing. When the springs 65 are permitted to engage the
the jarring mechanism E, which is intended to deliver up
friction drag portions 64 fully with the wall of the well
wardly directed blows onto the jar housing 37 and the
casing, the lower gripping portions 62 are disposed in
45 wardly out of engagement with the wall of the well cas
tension mandrel or rod 30.
Upward movement of the upper slips 24 is prevented
ing B. However, when the control expander 40 is moved
by their engagement with the lower end of ‘a setting
upwardly behind the gripping portions 62, as described
sleeve 38 having an inwardly directed ?ange or end wall
hereinbelow, the slips 53 are rocked on the lower ends of
39 slidable on the rod 30. A setting expander 40 is
their drag portions 64 against the force of the spring
secured to the setting sleeve 38, this setting expander 50 to shift the gripping portions 62 into anchoring engage
consisting of a lower circumferential continuous expander
ment with the well casing. 7
skirt 41 attached to the setting sleeve 38, as by means
Normally, the control or setting slips 53 are disposed
of one or more screws 42. The expander member has
a‘substantial distance above the control expander 40.
an upper expander portion 43 provided with external
They will tend to occupy. such position above the control
tapered surfaces 44 inclined in an inward ‘and upward 55 expander during lowering of the apparatus in the well
direction. The expander portion 43 is able to move or
casing because of the frictional engagement of the drag
?ex laterally to a certain extent by providing circum
‘portions 64 against the casing. When the control mem
ferentially spaced longitudinal slots 45 therethrough sep
ber 48 is moved upwardly, the drag portions 64 resist
arating the expander into segments 43, which can shift f -' corresponding upward motion of the control slips 53, so
inwardly to some extent as well as outwardly to some 60 that the expander member 40 can be moved toward the
extent. Initially, the cylindrical inner surfaces 46 of the
slips 53. However, the expander 40 can be selectively
expander segments 43 engage a cylindrical backing por
permitted or ‘prevented from being wedged behind the
tion 47 formed on a tubular control member or mandrel
control slips 53 by the operator at the top of the well bore
48 encompassing the tension rod30. The backing portion‘
47, when disposed behind the expander segments prevents
the latter from moving ‘inwardly. As explained herein
below, when the control member 48 is moved upwardly
with respect to the expander, itslcylindrical backing por
through suitable manipulation of the wire line running-in
65 string C. As speci?cally disclosed, a pin and slot or track
device 70, 71 is provided between the slip assembly and
the control member which can prevent anchoring of the
slips 53‘ against the well casing upon upward movement
'of the running-in string C and the control member 48, or
40, allowing the segments 43 of the latter to ?exinwardly 70 which‘ can permit such result. The control device can
to a certain extent.
’
also be manipulated to withdraw the apparatus from the
tion 47 is disposed above the upper end of theexpander -
The control member or mandrel 48 extends upwardly
along the tension rod 30, its upper end being ‘threadedly
attached to a head or nut 50 slidable along an upper re
duced diameter portion 51 of the tension rod. The ten
well bore without setting the bridge plug A, the control
expander 40 being prevented from .wedging behind the
slips 53 despite upward movement of the control member
48 and expander 40. At anytime, the. parts can be placed
3,024,845
5
6
in a condition in which wedging of the expander 40 be
tapered slot portion 84 to provide a shoulder 93 engage
able by the pin to prevent upward return movement of
the pin back into the tapered slot portion 84.
hind the slips 53‘ can occur.
As speci?cally disclosed, the slip guide 59 has a key
or pin 70 mounted in a radial bore 72 therein which is
The several shoulders 89 to 93 referred to and engage
adapted to ride in a complex trackway or slot 71 provided
in the exterior of the control member or mandrel 48.
This key 70‘ is urged in an inward direction by a helical
able by the pin 70 are provided merely by tapering the
bases of the several slot portions to a slight extent in an
outward direction adjacent the shoulders. That is to say,
compression spring 73 bearing against the base of a key
the different tapered slot portions are just made slightly
socket 74, with its outer end engaging a retaining ring 75
shallower at the points indicated than the adjacent longi
encompassing the guide and extending across the outer 10 tudinal slots to prevent the key or pin from inadvertent
end of the radial bore 72 therein. This retaining ring 75
return movement into the tapered slot portions.
may extend below the lower end of the guide 59‘ and across
The split ‘expander member 40 can only be moved up
the slip‘ ring slots 54 so as to form a stop limiting outward
wardly into wedging or anchoring engagement with the
movement of the slips 53 under the in?uence of the com
slips 53 when the key 70 is disposed in the lower setting
pression springs 65. The key spring 73 allows some radial 15 or ?ring slot portion 85 of the control member. When
movement of the key 70 in the radial bore 72 so that the
key can accommodate itself to different depths of por~
tions of the track or slot 71 formed in the control mem
ber 48.
the key is disposed in the removing slot portion 79, the
apparatus is removable from the well bore without setting
the plug A, the expander ‘40' being retained in a position
spaced below the slips 53. During lowering of the ap
The trackway 71 in the control member is illustrated 20 paratus in the well casing, the friction drag portions 64
diagrammatically in FIG. 2. It includes an upper longi
of the slips bear against the casing wall and tend to hold
tudinally extending running-in portion 76 which termi
the slip assembly in an upper position along the control
nates in a lower inclined surface 77 directed to the right,
as seen in FIG. 2, this surface forming lower end of a
or retracting longitudinal slot portion 79 disposed to the
right ‘of the running-in slot portion 76. The retracting
member 48, as limited by engagement of the key 70 with
the upper end of the running-in slot portion 76 (position
When so engaged the control member 48
forces the slips 53 frictionally along the wall of the well
casing, with the gripping portions 62 of the slips in re
slot portion 79 extends longitudinally in an upward direc
tracted position.
tapered slot portion 78 that terminates in a non-setting 25 1 in FIG. ‘2).
tion and merges into an inclined slot or track portion 80
which is inclined in an upward direction to the right, as
seen in FIG. ‘2, the upper end of the inclined slot being
When the location in the well casing B is reached at
which the ‘well packer A is to be set, it. is merely neces
sary to move the running-in string C upwardly, which up
defined by a tapered side 81 of the slot, the tapered slot
ward movement will be transmitted through the sinker bar
80 itself merging into a longitudinal releasing slot portion
F and wire line jar E to the tension rod 30, and through
82 which extends from the tapered slot portion in both
the releasing stud 32 and plug 33 to the body '10 of the
35
an upward and a downward direction. The upper end of
tool. From the body of the tool, the upward movement
the releasing slot portion 82 merges into a recycling or
is transmitted through the upper expander 20 to the
repeating slot portion 83, which is inclined in an upward
direction toward the running-in portion 76 into which it
merges. The lower portion of the releasing slot 82
merges into a slot portion 84 which is inclined in a down
ward direction toward the left, as seen in FIG. 2, this in
clined slot portion merging into an actuating or ?ring lon
gitiudinal slot portion 85 depending therefrom. The up
upper slips 24, and from the latter through the setting
sleeve 38 to the control member 48.
40
The frictional en
gagement of the drag portions 64 Will prevent the con
trol slip assembly from moving upwardly. As a result,
the control member 48 is shifted upwardly until the key
70 engages the lower end of the running-in portion 76
of the slot, being guided by the lower tapered wall 77
into the retrieving slot portion 79. When the pin 70
ing or repeating slot portion 86 inclined in an upward 45 engages the bottom end of such portion (position 2 in
per end of this latter slot portion 85 merges into a recycl
direction toward the left, as seen in FIG. 2, this recycling
portion having an intermediate longitudinal section 87
that merges into an upper slot portion 88 inclined in an
upward direction toward the longitudinal running-in por
tion 76.
FIG. 2), the expander 40 has still not been moved to a
sufficient extent to expand the slips ‘53 against the wall
of the well casing.
If at this time the operator ‘decides not. to set the bridge
50 plug A, the apparatus can be removed from the well cas
‘
ing. If however, the plug is to be set, then the running
in string C is lowered, ‘which will result in lowering of
all of the apparatus in the well bore, with the exception
end of the running-in slot portion 76 down to the retrieving
of the slip assembly 53, 59, etc., and its. key 70, the key
slot portion 79 being prevented from moving into the re
peating slot portion 88 by virtue of the fact that the run 55 then moving relatively upwardly in the retrieving slot
portion 79, engaging the tapered ‘wall 81 at its upper end,
ning-in slot portion 76a adjacent the repeating slot por
and being shifted laterally to the left into the releasing
tion 88 is slightly deeper than the contiguous repeating
slot portion 82. At this time, the running-in string C
slot portion, providing a shallow shoulder 89 against which
can either be moved in an upward direotion or in a
the side of the pin 70' will ride. Similarly, the retracting
The key or pin 70 is adapted to ride in all portions of
the trackway or slot 71.
It can move from the upper
slot portion 79 is deeper than the inclined slot portion 78 60 downward direction. If the operator Wishes to lower
the apparatus to a further extent, he need merely lower
adjacent thereto, providing a longitudinally extending
the running-in string C, Iwhich will merely result in the
shoulder 90 to be engaged by the side ‘of the pin to prevent
key 70 shifting through the repeating or recycling por
its return movement back into the running-in slot portion
tion 82, 83 of the slot back to the running-in slot portion
76. Similarly, the portion of the releasing slot 82 adja
cent the inclined slot 80 is deeper than such adjacent por 65 76. Upon its engaging the upper end of this slot portion,
the slip assembly will also ‘be forced downwardly through
tion of the inclined slot to provide a longitudinal shoulder
the casing. On the other hand, should the operator de
91, preventing return movement of the pin from the re
cide to set the plug after the pin 70 has been disposed
leasing slot portion into the tapered slot portion 80. The
in the releasing slot portion 82, he need merely take an
upper part 76b of the running-in slot portion 76 is also
pull on the running-in string C, which will move
deeper than the adjacent inclined repeating slot portion 70 upward
all of the apparatus, with the exception of the slip as
83, providing a longitudinal shoulder 92 to be engaged
sembly 53, etc., upwardly within the casing, the control
by the pin or key 70' to prevent its return movement into
member 48 being moved upwardly along the key 70 until
the inclined slot 83. Finally, the slip engaging or ?ring
the latter engages the tapered slot portion 84 and is
slot portion 85 is deeper adjacent the lower end of the 75 guided laterally into the setting or ?ring slot portion 85.
3,0243%
7
8
jar sleeve, such beams or struts being capable of de?ect
During such movement, the expander 40 is shifted up
ing in an inward and outward direction to a required
wardly and, if a su?icient upward movement is now
extent. Formed integrally with intermediate portions of
taken (which is permitted by the fact that the pin or
key islocated in the setting slot portion 85) (position 4
the beams or struts 107 are outwardly extending cam
elements 108 having upper cam surfaces vl0) inclined in
an upward and inward direction, and also lower cam sur
in FIG. 2), the expander 40 is now moved upwardly
within the gripping slip portions 62, shifting the latter
outwardly into anchoring engagement with the wall of
the well casing (FIG. 4). When such anchoring occurs,
the expander 40 and the setting sleeve 38 cannot be
moved upwardly to any further extent, which also pre
faces 110. The ?exible beam portions ‘107 of the jarring
sleeve 105 extend into a control sleeve 111 disposed
within the lower housing portion 36. This control sleeve
has a plurality of circumferentially spaced longitudinally
extending slots 112, providing ?exible arms 113 disposed
around the beam portions 10-7 and terminating in up
cludes upward movement of the upper set of slips 24 of
the well packer. The tension mandrel or rod 3i) can now
wardly extending latch ?ngers I114’ cooperable with the
be subjected to an upwardly directed force for the pur~
cam elements 108, and also with a tapered shoulder ‘1'15
pose of anchoring the well packer A in packed~off con
dition within the well casing B, in the manner described 15 inclined in an upward and inward direction, and a nor
mal shoulder 116, provided by the lower end of the upper
above.
housing portion 100. The latch ?ngers 1414 have outer
inclined surfaces 117 engageable with and companion to
the tapered housing surface 115, this tapered housing sur
screws 25 holding the upper set of packer slips 24 to the
upper expander 20, if the operator decides not to set the 20 face terminating at its upper end in the shoulder 116
normal to the axis of the apparatus, which is engageable
well packer, he can merely lower the running-in string
by a companion end surface 118 on the ?ngers. The
C, which will lower all of the apparatus with the excep
After the control expander 40 has been wedged be
hind the control slips 53, and prior to shearing of the
?ngers 114 also have inner lower surfaces ‘119 inclined
in inward and upward directions companion to and en
gageable with the upepr surfaces 109 of the cam ele
ments 108. These ?ngers have upper inner inclined sur
tion of the control slip assembly 53 to 74 in the Well
casing, the expander 40 being moved downwardly out
of wedging engagement with the control slips 53 and
allowing the springs 65 to rock the slips about their drag
portions 64 and shift the gripping portions 62 inwardly
away from the wall of the well casing.
faces 120 engageable by the lower cam surfaces 110.
The lower end 121 of the control sleeve 1111 is tapered
in a downward and inward direction, and is adapted to
The lowering
movement can occur until the slotted structure 711 has
moved downwardly along the key 70, the key moving in
a relatively upward direction through the repeating por
30 rest upon a companion tapered surface 122 formed in
tion 86, 87, 88 of the slot and back into the running-in
portion 76. If the apparatus is then to be withdrawn
from the well bore, the running-in string C need merely
be moved upwardly, which will move all portions of the 35
apparatus, with the exception of the control slip as
sembly, in an upward direction until the key 70 is dis
posed in the lower end of the retrieving slot portion 79
(position 2 in FIG. 2), whereupon the slip assembly is
caused to move upwardly with the remainder of the
apparatus.
The apparatus, including the bridge plug A, can either
be removed from the well bore or the entire apparatus
can be shifted to some other location at which the plug
the lower portion of the lower housing member 36. The
control sleeve 111 has a length which is slightly less than
the distance between the lower housing shoulder 122 and
the upper shoulder 116, in order that the control sleeve
can shift downwardly to provide a space between the
inclined housing shoulder 115 and the ?ngers 114 of the
arms 113.
The mandrel 103 and the jar sleeve 105 are initially
disposed in a lower position with respect to the housing
37. When in this lower position, a hammer or impact
head or shoulder 123 on the lower portion of the mandrel
is spaced a substantial distance below the companion head
101 of the housing.
The mandrel 103 is disposed in its lower position
is to be set, after which the running-in string C is again 45 within the housing 37 by the coengagement of the cam
elements 108 with the cam ?ngers 114, which, in turn,
manipulated to place the pin 70 in the setting slot por
‘bear against the shoulders 115, 116 of the upper housing
tion 85, in order that the control expander 40 will again
portion 100. Such position is illustrated most clearly in
shift the control slips 53 into anchoring engagement with
FIG. 11. Following the engagement of the expander 40
the wall of the well casing, and prevent upward move
ment of the upper set of bridge plug slips 24.
50 within the upper slips 53, an upward pull taken on the
running-in string C is transmitted through the mandrel
As disclosed in the drawings, the upward force is im
103 and the jarring sleeve 105 to the cam elements 108,
panted to the tension rod or mandrel 30 by the jarring
and from the latter through the inclined surfaces 109,
mechanism E. If need be, repeated upwardly directed
119 to the ?ngers 114, from where the upward force is
blows or forces can be imparted on the tension rod 30
for transmission to the body ‘10 of the tool, in order to 55 transmitted to the housing shoulders 115, 116 running
from the shoulder through the housing 37 to the tension
fully and properly anchor the well packer A in packed
‘rod 30. From the latter, the upwardly directed force is
olf condition in the well casing B and release the entire
transmitted through the release stud 32 to the housing
setting mechanism C, D, E, F, G from the set well
plug 33 and into the body 10, the force then being trans
packer. Such jarring mechanism includes the lower por
tion 36 of the housing 37, which is secured to the upper 60 mitted through the upper shear screws 21 holding the
upper packer expander 20 to the body, and through the
sub 35 threadedly attached to the upper end of the ten
upper slip screws 25 to the slips 24 and the setting sleeve
sion rod 30. This lower housing portion is threadedly
38. The setting sleeve cannot move upwardly, since it is
attached to an upper housing portion i100 having an
prevented from doing so by the wedging of the expander
upper housing head 1G1 threadedly secured therein and
providing a downward-1y facing shoulder 102. Tele 65 40 within the control slips 53. The upwardly directed
force on the running-in string C and the jar mandrel 103
scopically mounted within the upper housing portion 100
can increase. Such upward force tends to de?ect the
is a jar mandrel ‘103, the upper end of which is threadedly
struts or beams 107 inwardly, because of the inclined
secured to a sub 104 which is, in turn, threadedly at
engagement of the cam surfaces .109 with the spring
tached to the sinker bar F.
The lower end of this mandrel 103 is threadedly at 70 ?ngers 114, and when the force becomes suf?cient, as,
for example, when it reaches a total upward pull of
tached to a jar sleeve ‘105 which can extend downwardly
1500 pounds, the struts 107 are de?ected inwardly to
into the lower jar housing 36. This jar sleeve is pro
vided with a plurality of longitudinally extending cir
cumferentially spaced slots 1% to de?ne ?exible beams
the extent at which the cam surfaces 109 are released,
such as shown in FIG. 12, whereupon the upwardly di
or struts 107 between the upper and lower ends of the 75 rected force, which has suddenly been released, will cause
er'
3,024,845
the jar mandrel 103 to be propelled in an upward direc
tion until its hammer portion 123 strikes an impact blow
upon the housing head 101. This impact blow is trans
ferred through the housing 37 to the tension rod 30, and
from the latter through the release stud 32 and plug 33 to
the body 10. It is usually su?icient in extent to shear the
screws 25 holding the upper slips 24 to the upper ex
10
freeing the setting tool from the bridge plug. The setting
tool C, D, E, F, G can now be Withdrawn from the well
bore. However, before such withdrawal can occur, the
control expander 40 must be released from anchoring
engagement behind the control slips 53.
Following disruption of the release stud 32, running
in string C, sinker bar F, and jar mandrel 103 are ele
pander 20, causing the body 10 to move upwardly with
vated, the hammer head 123 engaging the housing shoul
in these upper slips 24 and expanding the latter outwardly
der head 102 and elevating the housing 37. Such elevat
into anchoring engagement with the wall of the well 10 ing action will also raise the tension rod 30 until the rod
casing. The initial blow may also be sufficient in extent
shoulder 52 engages the nut 50 on the control member
as to shear the screws 21 holding the upper expander 20
to the body 10 and result in movement of the lower ex
or mandrel 48, shifting such control member or mandrel
upwardly within the slip assembly 53, etc., and also with
in the split expander member 40. The backing portion
pander 16 towards the upper expander 20, to fore
shorten the packing sleeve 19 and expand it outwardly
47 of the control member is shifted upwardly of the split
into sealing engagement with the wall of the well casing.
member 43 of the expander 40 until it is disposed above
It may also be sut?cient to shear the other screws 17, 18
its upper end. When so disposed, there is no support be
holding the lower expander ‘16 to the body and the lower
hind the Slip expander segments 43, which then retract
slips 12 to the lower expander and radially outward into
slightly with respect to the gripping portions 62 of the
anchoring engagement with the wall of the well casing. 20 slips 53, allowing the latter to be shifted inwardly by
Assuming that both the upper and lower sets of slips
the springs 65 from the well casing. The upper shoulder
24, 12 and the packing sleeve 19 have been brought into
1'25 of the backing portion engages the lower end of the
engagement with the well casing, the release stud 32 is
slip ring 55 and will then carry the slip assembly upward
still intact. Another blow may be struck by the jarring
ly with the control mandrel 48. When the control man
mechanism E to still further embed the packer slips in 25 drel 48 moves upwardly, an inner lower shoulder 126
the well casing and seal the packing sleeve more ?rmly
formed thereon will engage the outwardly directed
against the wall of the well packer and against the periph
?ngers 127 of a retrieving sleeve 128, which are provided
ery of the body 10. All that need be done is to recock or
reset the jarring mechanism E, which action can occur
at the upper end of arms 129 that are formed in the re
lower the jar mandrel 103 and bring the lower surfaces
end of this retrieving sleeve 128 is threadedly, or other
trieving sleeve by a plurality of circumferentially spaced
merely by lowering the running-in string C which will 30 longitudinally extending slots 130‘ therein. The lower
110 of the cams 108 against the upper ends 120 of the
?ngers 114, such as disclosed in FIG. 13.
Following
wise secured, to the setting sleeve ?ange 39. According
ly, upward movement of the control member 48 will
cause the outer shoulder 125 to engage the slip sleeve
of upward movement of the jar mandrel 103, the control 35 55 and raise the setting slips 53 upwardly therewith. At
sleeve 111 has dropped downwardly into engagement
the same time, the inner shoulder 126 will engage the
with the lower portion 122 of the lower housing 36,
?ngers 127 of the retrieving sleeve 128 raising such re—
leaving a space between the ?ngers 114 and the upper
trieving sleeve, the setting sleeve 38, and the slip expander
housing shoulders 115', 116 (FIG. 13). Accordingly,
member 40 therewith. The entire setting apparatus can
and particularly since the arms 113 are rather ?exible, 40 now be elevated in the well casing and withdrawn from
the downward movement of the ?exible beams 107 and
the well bore, leaving the bridge plug A anchored in
the cams 108 along the ?ngers 114 will de?ect the arms
packed-oif condition in the well casing B.
113 outwardy very readily, since only a comparatively
The inventor claims:
slight force is required, the lower cam surfaces 110 per
1. In apparatus for setting a well device in a well con
forming this action until the cams 108 are again disposed
duit, which device includes a body and normally retracted
under the cam ?ngers 114 (FIG. 14). The wire line B 45 means adapted to be expanded laterally outwardly into
and the jar mandrel 103 can then be raised, the upper
engagement with the Wall of the well conduit: a member
cam surfaces 109 engaging the lower ?nger surfaces 119
attached to the body; means adapted to engage the Well
and elevating the control sleeve 111 until the ?ngers 114
conduit and the normally retracted means to resist lon
again engage the housing shoulders 1115, 116 in the
gitudinal movement of the normally retracted means in
manner described in FIG. 11. Such upward movement
the
well conduit; jarring means connected to said mem
will not de?ect the arms 113 outwardly, since the angle
release of the cams 108 from the surfaces 119 as a result
ber to strike a blow transmitted to said member and t0
the well device to expand the normally retracted means
against the wall of the Well conduit while said resisting
\An upwardly directed force can again be imposed upon
means engages the well conduit and the normally re
the wire line C and the jar mandrel 113, until the beam-s 55
tracted means; and means on said member engageable
107 are again de?ected inwardly to release their cams
of taper of the upper cam surfaces 109 is not as steep
as the angle of taper of the lower cam surfaces L10.
108 from the ?ngers 114, the hammer head 123 moving
upwardly rapidly and striking another blow against the
housing head 101, which is transmitted through the ten
sion rod or mandrel 30 and the release stud 32 to the body 60
with said resisting means for withdrawing said resisting
means from the well conduit after said normally retracted
means has been expanded against the well conduit.
2. In apparatus for setting a well device in a well con
duit, which device includes a body and normally retracted
10, and to the several slips and packing portions of the
means adapted to be expanded laterally outwardly into
apparatus surrounding the body, to more ?rmly expand
engagement with the wall of the well conduit: a member
the slips 24, 12 into anchoring engagement with the well
casing and the packing sleeve 19 into sealing engagement
attached to the body; means adapted to engage the well
with the well casing B and the packer body. The jar 65 conduit and the normally retracted means to resist lon
mandrel 103 can again be lowered to the resetting con
dition, and then raised, repeated impact blows being de
gitudinal movement of the normally retracted means in
the well conduit in one direction; jarring means connected
livered through the tension rod 30 and the release stud
to said member to strike a blow in said one direction
32, to secure the ?rm and positive anchoring in packed
transmitted to said member and the well device to expand
70
ol’f condition of the well packer A with respect to the
the normally retracted means against the wall of the well
casing. When such positive setting of the well packer
conduit while said resisting means engages the well con
has been realized, an impact blow will eventually over
duit and the normally retracted means; and means on
come the tensile strength of the release stud 32, dis
said member engageable with said resisting means for
rupting the latter at its reduced diameter portion 34 and 75 withdrawing said resisting means from the well conduit
3,024,845
11
after said normally retracted means has been expanded
against the well conduit.
3. In apparatus for setting a well device in a well con
duit, which device includes a body and normally retracted
means adapted to be expanded laterally outwardly into
12
tracted means adapted to be expanded laterally outwardly
into engagement with the wall of the well conduit: a
member attached to the body; normally retracted gripping
means adapted to be anchored to the well conduit; means
engageable with the normally retracted means and coact
ing with said gripping means to expand said gripping
engagement with the wall of the well conduit: a member
means against thewell conduit to prevent longitudinal
attached to the body; means adapted to engage the well
movement of the normally retracted means in one direc
conduit and the normally retracted means to resist up
tion; control means connected to said gripping means and
ward movement of the normally retracted means in the
well conduit; jarring means connected to said member to 10 expanding means for selectively preventing or permitting
such expansion of said gripping means; and jarring means
strike an upwardly directed blow which is transmitted to
connected to said member to strike a blow in said one di
said member and the well device to expand the normal
rection which is transmitted to said member, the well de
ly retracted means against the wall of the well conduit
vice and its normally retracted means to expand the nor
while said resisting means engages the well conduit and
the normally retracted means; and means on said mem 15 mally retracted means against the wall of the well conduit
while said gripping means is anchored to the well conduit.
ber engageable with said resisting means for withdraw
8. In apparatus for setting a well device in a well con
ing said resisting means from the well conduit after said
normally retracted means has been expanded against the
duit, which device includes a body and normally retracted
means adapted to be expanded laterally outwardly into
well conduit.
4. In apparatus for setting a well device in a well con 20 engagement with the Wall of the well conduit: a member
duit, which device includes a body and normally retracted
attached to the body; normally retracted gripping means
means adapted to be expanded laterally outwardly into
adapted to be anchored to the well conduit against up
engagement with the wall of the well conduit: a member;
ward movement; means engageable with the normally
means releasably securing said member to the body;
retracted means and coacting with said gripping means
means adapted to engage the well conduit and the nor
to expand said gripping means against the well conduit
mally retracted means to resist longitudinal movement
to prevent upward movement of the normally retracted
of the normally retracted means in the well conduit; jar
means in one direction; control means connected to said
ring means connected to said member to strike a blow
gripping means and expanding means for selectively pre
venting or permitting such expansion of said gripping
transmitted to said member, releasable means and well
device to expand the normally retracted means against 30 means; and jarring means connected to said member to
the wall of the well conduit and to release said releasa
strike an upwardly directed blow which is transmitted to
ble means while said resisting means engages the well
said member, the well device and its normally retracted
conduit and the normally retracted means; and means on
means to expand the normally retracted means against the
said member engageable with said resisting means for
wall of the well conduit while said gripping means is
withdrawing said resisting means from the well conduit 35 anchored to the well conduit.
after said normally retracted means has been expanded
9. In apparatus for setting a well device in a well con
against the well conduit.
duit, which device includes a body and normally retracted
5. In apparatus for setting a well device in a well con
means adapted to be expanded laterally outwardly into
duit, which device includes a body and normally retracted
engagement with the wall of the well conduit: a member;
means adapted to be expanded laterally outwardly into 40 means releasabily securing said member to the body; nor
engagement with the wall of the well conduit: a mem
mally retracted gripping means adapted to be anchored
ber; means releasably securing said member to the body;
to the well conduit against upward movement therewithin;
means adapted to engage the well conduit and the nor
means engageable with the normally retracted means and
mally retracted means to resist upward movement of the
coacting with said gripping means to expand said gripping
normally retracted means in the well conduit; jarring 45 means against the well conduit to prevent upward move
means connected to said member to strike an upwardly
ment of the normally retracted means; control means
directed blow which is transmitted to said member, re
leasable means and well device to expand the normally
retracted means against the wall of the well conduit and
connected to said gripping means and expanding means
to release said releasable means while said resisting means
6. In apparatus for setting a well device in a well con
said member to strike an upwardly directed blow which
is transmitted to said member, releasable means, the
well device and its normally retracted means to expand
the normally retracted means against the wall of the well
conduit while said gripping ‘means is anchored to the well
conduit and to release said releasable means.
10. ‘In apparatus for setting a well device in a well con
duit, which device includes a body and normally retracted
means adapted to be expanded laterally outwardly into
duit, which device includes a body and normally retracted
means adapted to be expanded laterally outwardly into
engages the well conduit and the normally retracted
means; and means on said member engageable with said
resisting means for withdrawing said resisting means from
the well conduit after said normally retracted means has
been expanded against the well conduit.
for selectively preventing or permitting such expansion
of said gripping means; and jarring means connected to
engagement with the wall of the well conduit: a member
engagement with the wall of the well conduit: a member;
attached to the body; means adapted to be anchored to 60 means releasably securing said member to the body; nor
the well conduit and engageable with the normally re
mally retracted gripping means adapted to be anchored
tracted means to prevent longitudinal movement of the
to the well conduit against upward movement therewithin;
normally retracted means in the well conduit in one di
means engageable with the normally retracted means and
rection; jarring means connected to said member to strike
coacting with said gripping ‘means to expand said gripping
a blow in said one direction which is transmitted to said 65 means against the well conduit to prevent upward move
member, the well device and its normally retracted means
ment of ‘the normally retracted means; control means
to expand the normally retracted means against the wall
connected to said gripping means and expanding means
of the well conduit while said anchoring means engages
for selectively preventing or permitting such expansion of
the well conduit and the normally retracted means; and
said gripping means; jarring means connected to said
means on said member engageable with said anchoring
member to strike an upwardly directed blow which is
means for withdrawing said anchoring means from the
transmitted to said member, releasable means, the well
well conduit after said normally retracted means has
device and its normally retracted means to expand the
been expanded against the well conduit.
7. In apparatus for setting a well device in a well con
normally retracted means against the wall of the well
conduit while said gripping means is anchored to the well
duit, which device includes a body and normally re 75 conduit and to release said releasable means; and means
13
8,024,845
for retracting said gripping means from the well conduit
after release of said releasable means.
11. In apparatus for setting a well device in a well con
duit, which device includes a body and normally retracted
means adapted to be expanded laterally outwardly into
engagement with the wall of the well conduit; a member
‘adapted to be attached to the ‘body; normally retracted
slips adapted to be anchored to the well conduit; expander
means engageable with the normally retracted means and
engageable with said slips to expand said slips against the
well conduit to prevent longitudinal movement of the
normally retracted means in one direction; control means
connected to said slips and expander means for selectively
preventing or permitting such expansion of said slips; and
14
tive position to permit such expansion; and jarring means
connected to said mandrel to strike a blow in said one
direction which is transmitted to said mandrel and body
to expand said normally retracted means against the wall
of the well conduit while said slip means is anchored to
the well conduit.
15. In apparatus for setting a well device in a wall
conduit, which device includes a body and normally re
tracted means on said body adapted to be expanded lat
10 erally outwardly into engagement with the wall of the well
conduit: a mandrel attached to the body; a control mem
ber surrounding said mandrel; normally retracted slip
means on said member adapted to be anchored to the well
conduit; expander means or said member engageable with
jarring means connected to said member to strike a blow 15 the normally retracted means and engageable with said
in said one direction which is transmitted to said member,
the well device and its normally retracted means to ex
slip means to expand said slip means against the well
conduit to prevent longitudinal movement of the normally
pand the normally retracted means against the wall of
retracted means in one direction; backing means on said
the well conduit while said slips are anchored to the well
member behind said expander means to retain said ex
conduit.
20 pander means engaged with said slip means; coengagea
12. In apparatus for setting a well device in a Well con
duit, which device includes a body and normally retracted
means adapted to be expanded laterally outwardly into
ble means on said control member and slip means adapt
ed to occupy one relative position to prevent said ex
pander means from expanding said slip means and an
engagement with the wall of the well conduit: a member;
other rclative position to permit such expansion; jarring
means releasably attaching said member to the body; nor 25 means connected to said mandrel to strike a blow in
mally retracted slips adapted to be anchored to the well
said one direction which is transmitted to said mandrel
conduit against upward movement therewithin; expander
and body to expand said normally retracted means against
means engageable with the normally retracted means and
the wall of the well conduit while said slip means is
engageable with said slips to expand said slips against
anchored to the well conduit; and means for moving said
the well conduit to prevent upward movement of the nor 30 backing means from behind said expander means to per
mally retracted means; control means connected to said
mit retraction of said expander means from said slip
slips and expander means for selectively preventing or
permitting such expansion of said slips; and j-arning means
means.
16. In apparatus for setting a well device in a well
connected to said member to strike an upwardly directed
conduit, which device includes a body and normally re
blow which is transmitted to said member, releasable
tracted means on said body adapted to be expanded lat
means, the Well device and its normally retracted means
erally outwardly into engagement with the wall of the
to expand the normally retracted means against the wall
well conduit; a mandrel; means releasably securing said
of the well conduit while said slips are ‘anchored to the
mandrel to the body; a control member surrounding said
well conduit and to release said releasable means.
mandrel; normally retracted slip means on said mem
13. In apparatus for setting a well device in a well con 40 ber adapted to be anchored to the well conduit against
duit, which device includes a body and normally retracted
upward movement therewithin; expander means on said
means ‘adapted to be expanded laterally outwardly into
member engageable with the normally retracted means
engagement with the Wall of the well conduit: a member;
and engageable with said slip means to expand said slip
means releasably attaching said member to the body; nor
means against the well conduit to prevent upward move
mally retracted slips adapted to be anchored to the well 45 ment of the normally retracted means; backing means on
conduit against upward movement therewithin; expander
said member behind said expander means to retain said
means engageable with the normally retracted means and
expander means engaged with said slip means; coengagea
engageabtle with said slips to expand said slips against the
ble means on said control member and slip means adapt
ed to_occupy one relative position to prevent said ex
retracted means; control means connected to said slips 50 pander means from expanding said slip means and an
well conduit to prevent upward movement of the normally
and expander means for selectively preventing or permit
ting such expansion of said slips; jarring means connected
other relative position to permit such expansion; jarring
means connected to said mandrel to strike an upwardly
to said member to strike an upwardly directed blow which
directed blow which is transmitted to said mandrel, re
is transmitted to said member, releasable means, the well
leasable means and body to expand said normally retract
device and its normally retracted means to expand the 55 ed means against the wall of the well conduit while said
normally retracted means against the wall of the well
slip means is anchored to the well conduit and to release
conduit while said slips are anchored to the well conduit
said releasable means; and means for moving said back
and to release said releasable means; and means for re
ing means from behind said expander means to permit
leasing said slips from said expander means to permit re
retraction of said expander means from said slip means.
traction of said slips.
17. In apparatus for for setting a well device in a well
60
14. In apparatus for setting a well device in a well
conduit, which device includes a body and normally re
conduit, which device includes a body and normally re
tracted means on said body adapted to be expanded lat
tracted means on said body adapted to be expanded lat
erally outwardly into engagement with the wall of the
erally outwardly into engagement with the wall of the
well conduit: a mandrel; means releasably securing said
well conduit: a mandrel attached to the body; a control 65 mandrel to the body; a control member surrounding said
member surrounding said mandrel; normally retracted
mandrel; normally retracted slip means on said member
slip means on said member adapted to be anchored to the
adapted to be anchored to the well conduit against upward
well conduit; expander means on said member engagea
movement therewithin; an expansible and contractible ex
ble with the normally retracted means and engageable
pander on said member engageable with the normally re
with said slip means to expand said slip means against 70 tracted means and engageable with said slip means to ex
the well conduit to prevent longitudinal movement of the
pand said slip means against the well conduit to prevent
normally retracted means in one direction; coengageable
upward movement of the normally retracted means; back
means on said control member and slip means adapted to
ing means on said member adapted to be disposed behind
occupy one relative position to prevent said expander
said expander to prevent its contraction; coengageable
means from expanding said slip means and another rela 75 means on said control member and slip means adapted
3,02%,845
15
to occupy one relative position to prevent said
expander from expanding said slip means and an
other relative position to permit such expansion; jarring
means connected to said mandrel to strike an upwardly
directed blow which is transmitted to said mandrel, re 01
16
to expand said slip means against the wall of the well
conduit; means for moving said backing means longitudi
nally from behind said expander to permit contraction of
said expander; and means coupling said backing means
and expander for joint longitudinal movement in the Well
leasablemeans and body to expand said normally re
tracted means against the wall of the well conduit while
conduit following movement of said backing means from
said slip means is anchored to the well conduit and re’
lease said releasable means; and means on said mandrel
20. In well apparatus: slip means adapted to be ex~
panded outwardly and anchored to the wall of a well con
behind said expander.
pandible and contractible expander segments engageable
behind said expander.
engageable with said member following release of said 10 duit; an expander member having circumferentially spaced
longitudinally extending slots therein to provide ex
releasable means, for moving said backing means from
' 18. In well apparatus: slip means adapted to be ex
panded outwardly and anchored to the wall of a Well con
with said slip means to hold said slip means anchored
to the conduit Wall, said expander segments having an
inner surface parallel to the longitudinal axis of the ex
duit; an expandible and contractible expander engageable
pander; backing means adapted to be disposed behind
with said slip means to hold said slip means anchored to
said segments and having an outer surface parallel to the
the conduit wall, said expander having an inner surface
longitudinal axis of the expander and engaging said inner
parallel to the longitudinal axis of the expander; back
surface to prevent contraction of said expander segments;
ing means adapted to be disposed behind said expander
and having an outer surface parallel to the longitudinal 20 means for jointly moving said backing means and ex
pander member in the same longitudinal direction relative
axis of the expander and engaging said inner surface to
to said slip means to expand said slip means against the
prevent contraction of said expander; means for joint
Wall of the well conduit; and means for shifting said
ly moving said backing means and expander in the same
backing means from behind said segments to permit their
longitudinal direction relative to said slip means to ex
pand said slip means against the wall of the well conduit; 25 contraction and release of said slip means from the con
and means for moving said backing means from behind
duit wall.
said expander to allow said expander to contract and
release said slip means from the conduit wall.
References Cited in the ?le of this patent
19. In well apparatus: slip means adapted to be ex
UNITED STATES PATENTS
panded outwardly and anchored to the wall of a well con
duit; an expandibie and contractible expander engagea
2,143,349
Hobbs ______________ __ Jan. 10, 1939
ble with said slip means to hold said slip means anchored
to the conduit Wall, said expander having an inner sur
2,389,869
2,392,244
Phipps ______________ __ Nov. 27, 1945
Hooser _______________ __ Jan. 1, 1946
2,566,323
2,605,843
Forsyth et al. _________ __ Sept. 4, 1951
Baker _______________ __ Aug. 5, 1952
surface to prevent contraction of said expander; means
2,678,101
2,690,228
Thaxton _____________ __ May 11, 1954
Baker _______________ __ Sept. 28, 1954
for jointly moving said backing means and expander in
‘ 2,751,017
Baker et al ____________ __ June 19, 1956
the same longitudinal direction relative to said slip means
2,901,046
Webber _____________ __ Aug. 25, 1959
face parallel to the longitudinal axis of the expander;
backing means adapted to be disposed behind said ex 35
pander and having an outer surface parallel to the 1on
gitudinal axis of the expander and engaging said inner
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