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Патент USA US3062305

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Nov. 6, 1962
v. D. HANES
3,062,295
BRIDGING PLUG
Filed April 20, 1959
5%
I
9 30%
7'_IE.-7 “FIE-5 ‘$55.55 _
VAUGHAN
INVENTOR.
DEAN HANES
M Q?”
ATTORNEY
States
"me
1
3,062,295
Patented Nov. 6, 1962
2
oil well casing with the packer generally indicated at 2,
in set position therein.
The packer is provided with an upper shoe 3 mounted
3,062,295
Vaughan Dean Hanes, West Covina, Calif., assignor to
BRIDGING PLUG
on an inner mandrel 6 which is mounted in a slidable
Aerojet-General Corporation, Azusa, Calif., 21 corpo
axial bore in an outer mandrel 4 which is provided with
ration of California
an enlarged head 5 providing an abutment by which
Filed Apr. 20, 1959, Ser. No. 807,620
5 Claims. (Cl. 166—2M)
pressure may be applied to a lower shoe 7.
'
The lower shoe 7, formed as a frusto-conical member
This invention relates to well tools and particularly to
slidably mounted on the outer mandrel 4, engages in the
oil well packers, bridging plugs, and similar devices of the 10 conical bore of an auxiliary shoe member 9 formed as
kind in which a tubular resilient sleeve mounted on the
a ring arranged so as to be ruptured at intervals around
tool is compressed axially and consequently expanded
its periphery when axial force is applied to the frusto
radially into sealing engagement with a well casing. Well
conical shoe to provide a plurality of separate auxiliary
tools of the kind referred also are usually provided with
shoe elements.
slips having serrated surfaces which are engaged with 15
The frusto-conical shoe 7 is also forced into the conical
the inner surface of the well casing and serve to prevent
bore of a member generally indicated at 10 which is
upward or downward movement of the packer due to a
formed as a rupturable ring which breaks into a plurality
pressure diiferential which may act on it. The slips may
of slips 14 when head 5 forces the ring 10 over the frusto
be arranged above the sleeve, below the sleeve, or both
conical shoe 7.
above and below the sleeve.
The auxiliary shoe member 9 is interposed between the
20
In many previously known well tools, the packer sleeve
slip ring member 10 and the packer sleeve 8 and rests
is initially engaged at each end on an annular shoulder
upon said slip ring member.
or shoe on the tool which must be of smaller diameter
The packer sleeve 8 of resilient material is mounted
than the well casing, thus leaving unsupported the annular
between the upper shoe 3 and the thick upper end of
portion of the rubber sleeve which extends when com—
the =frusto-conical lower shoe 7 in the running-in position
pressed outwardly of the shoulder or shoe.
shown in FIG. 2. In this position it will be noted that
It is characteristic of slip type packers and similar
the unbroken ring 10 of slips holds the narrow end of
tools that when the slips are in the expanded position they
shoe 7 spaced well above the surface of head 5. In
are of necessity spaced apart circumferentially. There
the set position shown in FIG. 1 the upper shoe 3
fore, the slips themselves cannot afford a continuous 30 mounted on the sliding mandrel 4 and the head 5 have
support for the ends of the packer sleeve.
been forced toward one another, as will belater ex
It is therefore an object of the present invention to
plained, with the result that the resilient sleeve 8 hasv
provide a novel expansible shoe construction in tools of
been longitudinally compressed and consequently radially
the kind referred to for either or both ends of the re
expanded into engagement with the casing as indicated
silient sleeve which will aiford a continuous support to 35 at 11.
the end of the sleeve engaged by the shoe.
The movement of the shoe 3 and head 5 toward one
With the above and other objects in view as will ap
another results in the thinner end of the frusto-conical
pear from the following speci?cation and accompanying
lower shoe 7 being driven into the conical bores :of
illustrative drawings, the invention comprises an oil well
auxiliary shoe member 9 and slip member 10 which are
tool, having a resilient packing sleeve supported between 40 formed so that the resulting ring stress breaks both rings
shoes by which axial compression may be imposed on
9 and 10 into a plurality of segments which are moved
said sleeve to radially expand it. The tool is also pro
radially outward against the casing as indicated at points
vided with slip means. At least one of the shoes is pro
12 and 13 in FIG. 1. In this position it will be noted
vided with an auxiliary shoe arranged to expand radi
that the narrow end of shoe 7 is much more closely adja
ally when actuated. Separate elements are arranged ef 45 cent the surface of head 5.
' '
,
fective to both expand said auxiliary shoe and the slip
Referring now to FIGS. 5 through 8 showing the ar
means, the auxiliary shoe and a ring of slips being e?ec~
rangement of ring member 9, which forms an auxiliary
tive to ?ll the gaps between said separate shoe elements
shoe, the upper thickened rim 15 may be provided with
to provide a continuous supporting surface to the end of
the packer engaged by said auxiliary shoe.
a smooth peripheral rim or as shown with a sharp edge 30.
50
In the drawings:
FIG. 1 is a view partly in central vertical section show
The ring 9 is formed with a plurality of downwardly
extending portions 21 having edges 21a oppositely in
clined. outwardly fromv the upper edge of the ring and
ing a packer constructed according to the invention in
leaving notches or spaces 18 between the portions 21.
set position in an oil well easing;
The inclined surface of contact between the auxiliary shoe
FIG. 2 is a vertical half section of the packer, the parts 55 elements 21 enables the slip elements 14 to support the
being shown retracted in the lowering position of the
shoe elements although the slip elements 14 move both
upward and outward while the auxiliary shoe elements
packer;
FIG. 3 is a fragmentary sectional view of a rupturable
move only radially outward. Outward movement of the
ring providing expandable shoes inter?tting with a rup
turable ring of slip elements in the lowering position of
the packer;
auxiliary shoe elements 21 progressively separates them
but the upward movement of the slip elements 14 main
tains the contact of the upper ends of slips 14 with the
auxiliary shoe elements. The metal of the ring 9 between
the spaces 18 and the upper edge of the ring is narrow
'
FIG. 4 is a view similar to that of FIG. 3 but showing
the parts when in set position;
FIG. 5 is a fragmentary view of a developed length of
the rupturable shoe ring;
and is reduced in thickness from front to back as indi
65 cated at 19 so that hoop stress set up in the ring can
FIG. 6 is a top plan view of the part shown in FIG. 5;
FIG. 7 is a fragmentary end view of the rupturable ring
of FIG. 5 taken on the line 7-7 of FIG. 5; and
FIG. 8 is a section of the rupturable ring of FIG. 5
taken on the line 8-8 of FIG. 5 through the projected 70
portions of the ring.
Referring now to FIG. 1, the numeral 1 indicates an
readily break it into a plurality of separate segments which
are moved radially outward and the upper edges of which
act as auxiliary shoes to support the lower edge of the.
resilient sleeve 8 which has also been radially expanded.v
The lower edge 8a of the sleeve 8 between the segments
of the ring 9 is also supported as will appear later.
The ring 10 of slips is formed in a manner comple
8,062,295
3
4
mentary to that of ring 9 as shown in FIG. 3. A plurality
of slip segments 14 are connected together to form a ring
by portions 17 of reduced thickness and height. The up
per ends of the slip elements 14 are tapered at the same
into setting engagement with the well casing. The seg
ments of the auxiliary shoe 9 taking part in the setting
operation of slips 14 by engagement of the upper ends
of the slips 14 with the depending portions 21 of auxiliary
shoe ring 9, also forces ring 9 upwardly on shoe 7 caus
ing rupture of the ring and outward movement of the
parts of the auxiliary shoe.
angle as the tapered depending portions 21 of the ring 9
and extend into the notches or spaces 18 between the pro
jections 21.
The described construction of the ring 10 leaves notches
or spaces 16 between the lower edges of the projections
21 and the upper edges of the reduced thickness portions
17 of the ring 10. The edges of peripheral teeth on the
slips is indicated at 20.
When the frusto-conical shoe 7 is forced into the con
ical bore of the slip ring 10 the reduced thickness por
tions 17 of the ring are ruptured similarly to the reduced
thickness portions of ring 9, fractures of ring 10 being
indicated at 22 in FIG. 4.
While any suitable means may be provided for effect
ing relative movement between the mandrel 6 and the
slidable outer mandrel 4, the means shown, by way of
example, in FIGS. 1 and 2 comprise a chamber 26 pro
vided by a reduced diameter portion 31 of the mandrel 6
and an inturned ?ange 32 at the upper end of the outer
mandrel 4. The chamber 26 may be ?uid sealed as by the
0 rings 33 and 34.
The mandrel 6 is also provided with an axial chamber
35 closed at its lower end as indicated at 36 and at its
upper end by the cable head 37 (FIG. 2). The cable
In the set condition, as indicated in HG. 4, the greater
portion of the area of the lower end face of the resilient
sleeve 8 is engaged against the wide upper surface of the
frusto-conical lower shoe 7 ‘but the annulus 8a of the
lower end face of sleeve 8, which has been radially ex
panded out of contact with shoe 7, is supported by a
continuous surface partly provided by the upper edge of
the elements of auxiliary shoe ring 9 and partly by the
upper edge of the separated slip elements ‘14 of the ring
19. FIG. 4 shows in exaggerated form the protrusion of
portions 23 of the lower edge of the sleeve 8 into the
spaces left between the separated portions of ring 9,
and engaged with the tops 24 of slips 14 which act as
auxiliary lower shoes. A continuous shoe surface for
the lower edge 8a of the sleeve 8 is provided by the de
scribed construction.
tIt will be obvious that the aux
iliary shoe 9 and slip structure 10 could be duplicated
at the upper end of the resilient sleeve 8.
Various other
changes could be readily made such as forming the slip
members 14 or segments of the ring 9 or both as separate
members retained on the tool by a binding of metal wire
head 37 can be attached to the mandrel 6 as by the shear
or strap which would securely retain the parts in posi
pins 38 passing through holes 39 through the upper end
of the sliding mandrel and through the head 37. The
tion on the tool until the wire or strap was ruptured by
the ring stress developed in the setting operation as de~
axial chamber 35 may be sealed at its upper end as by
the O-ring 40 mounted in a peripheral groove in the cable
head 37.
The axial chamber 35 communicates with the chamber
26 by means of the transverse ports 41 provided in the re
scribed, or the slip members and/ or auxiliary shoe mem
bers might be held in initial position ‘by shear screws as
is well known in the art. Also various other manners of
causing relative motion of the mandrel 6 and slidable
duced portion 31 of the mandrel 6.
that the invention is in no way limited by the embodiment
speci?cally described and shown but only as de?ned by
the scope of the appended claims.
I claim:
1. An oil well packer comprising a resilient packer
A propellant charge 29 (FIG. 2) is positioned in the
axial chamber 35. The charge 29 is provided with a squib
igniter 27 connected into an electric circuit provided by
the leads 42 running through cable 45, ground lead 43
outer mandrel 4 to set the packer, may be provided, so
and ground 44. The cable 45 extends to the surface and
sleeve adapted, when axially compressed, to engage the
supports the packer 2 in the casing 1. The propellant
charge 29 is adapted to be ignited by ?ring the squib
igniter 27 by completing an electrical circuit through the
squib 27 by suitable equipment (not shown) at the sur
face.
posite sides of said packer sleeve and coaxial therewith,
a slip ring surrounding said second shoe, ring means sur
rounding said second shoe and positioned between said
The mandrel 6 is provided near its lower end with
the upwardly facing teeth 46 adapted to mate with the
downwardly facing teeth 47 of the lock part 48. The
slidable outer mandrel 4 is provided at its lower end with
the counterbore 49 adapted to receive the lock part 48.
A plate 50, attached as by the screws 28, retains resilient
ring 25 urging the lock part 48 inwardly to operative posi
tion in the counterbore 49.
Upon igniting the propellant charge 29 by the igniter
wall of an oil well casing, ?rst and second shoes on op
slip ring and said packer sleeve, said slip ring and said
ring means each having circumferentially spaced reduced
thickness portions, means operatively associated with said
?rst shoe and said slip ring for forcing said slip ring, said
ring means and said second shoe toward said ?rst shoe to
compress said packer sleeve, and means for rupturing said
slip ring and said ring means at said reduced thickness
portions during movement thereof toward said ?rst
shoe.
2. An oil well packer as set forth in claim 1 and, in
addition, said reduced thickness portions of said slip
squib 27, the evolution of gas of the burning propellant
ring being alternately positioned relative to said reduced
develops pressure in chamber 35 which is communicated
thickness portions of said ring means whereby said
through ports 41 to chamber 26 and forces the mandrel
6 downwardly and the slidable outer mandrel 4 with head 60 ring means, when ruptured, provides a constant sup
port for portions of said packer sleeve and said slip ring,
5 upwardly. As the frusto-conical shoe 7 is driven by
the downward pressure acting on sleeve 8 into the con
ical bores of the ring members 9 and 10, they are broken
into segments by the fracturing of the weakened portions
17 of ring 10 and portions 19 of ring 9 until the resilient 65
sleeve 8 has reached a condition of maximum compres
when ruptured, supports the remaining portions of said
packer sleeve, thereby providing a continuous support for
said packer sleeve.
3. An oil well packer comprising a resilient packer
sleeve adapted, when axially compressed, to engage the
Wall of an oil well casing, ?rst and second frusto-conical
sion against the casing 1. Until rupture of the ring of
shoes on opposite sides of said packer sleeve with the
slip 10 occurs the force exerted by head 5 is transmitted
larger conical portions of said shoes being adjacent
directly through shoe member 7 to the lower face of sleeve
8. By incorporation of proper design parameters the ap 70 said packer sleeve and coaxial therewith, a slip ring en
gaging said frusto-conical shaped second shoe, ring means
paratus can be designed to insure that the force required
engaging said frusto-conical shaped second shoe and p0
to rupture is reached before the resilient sleeve 8 is fully
sitioned between said slip ring and said packer sleeve,
compressed. After rupture of ring 10 the lower shoe 7
said slip ring and said ring means each having circumfer
acts as a stationary wedge over which the separate slip
members 14 are forced upwardly and radially outwardly 75 entially spaced reduced thickness portions whereby said
3,062,295
5
slip ring and said ring means may be ruptured at said re
duced thickness portions upon movement thereof toward
said ?rst shoe, and means operatively associated with
said ?rst shoe and said slip ring for forcing said slip
ring, said ring means and said second shoe toward said
?rst shoe, thereby rupturing said slip ring and said ring
means and compressing said packer sleeve.
4. An oil well packer comprising a resilient packer
sleeve adapted, when axially compressed, to engage the
6
ring notches, means operatlvely associated with said ?rst
shoe and said slip ring for forcing said slip ring, said
auxiliary shoe means and said second shoe toward said
?rst shoe, thereby rupturing said slip ring and compress
ing said packer sleeve, said slip ring and said auxiliary
shoe means thereby contacting said packer sleeve to act
as a support therefor.
5. An oil well packer as set forth in claim 4 in which
said slip ring has teeth positioned on its periphery for
Wall of an oil Well casing, ?rst and second frusto-conical
contacting the Wall of the oil Well casing.
10
shoes on opposite sides of said packer sleeve with the
larger conical portions of said shoes being adjacent said
References (Iited in the ?le of this patent
packer sleeve and coaxial therewith, a slip ring surround
UNITED STATES PATENTS
ing said frust-o-conical shaped second shoe, said slip ring
2,121,002
Baker ______________ __ June 21, 1938
having notches opening toward said packer sleeve and
circumferentially spaced reduced thickness portions
2,467,801
‘Baker _____________ __ Apr. 19, 1949
whereby said slip ring may be ruptured at said reduced
thickness portions upon movement thereof toward said
?rst shoe, auxiliary shoe means surrounding said second
shoe member and positioned between said packer sleeve
and said slip ring, said auxiliary shoe means having de 20
2,546,377
2,726,722
Turechek ___________ __ Mar. 27, 1951
Baker ______________ __ Dec. 13, 1955
2,791,278
2,897,325
2,896,724
Clark ________________ __ May 7, 1957
WVebb ______________ __ Sept. 24-, 1957
Baker ______________ __ July 28, 1959
pending Wedge-shaped portions that engage said slip
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