N°V- 5: 1952
`
`Filed May 11, 1959
`
`c. c. BROWN
`PERMANENT-TYPE WELL PACKER
`
`3,062,291
`
`3 Sheets—Sheet 1
`
`WEATHERFORD
`
`INTERNATIONAL, LLC,
`et al.
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`EXHIBIT 1016
`
`WEATHERFORD
`
`INTERNATIONAL, LLC,
`et al.
`
`v.
`
`PACKERS PLUS
`
`ENERGY SERVICES,
`INC.
`
`N
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`M.%K
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`ATTO/?NE V
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`

`
`NOV» 5: 1962
`Nov. 6, 1962
`
`Filed May 11, 1959
`Filed May 11, 1959
`
`c. c. BROWN
`c. c. BROWN
`PERMANENT—TYPE WELL PACKER
`PERMANENT—TYPE WELL PACKER
`
`3,062,291
`3,062,291
`
`3 Sheets-Sheet 2
`3 Sheets-Sheet 2
`
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`BY
`BY
`
`C/C E/?O C. BROWN
`C/CERO C. BROWN
`INVENTOR.
`IN V EN TOR.
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`A TTORN E Y’
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`N0“ 6; 1952
`Nov. 6, 1962
`-
`-
`
`Filed May 11, 1959
`Filed May 11, 1959
`
`c. c. BROWN
`c. c. BROWN
`PERMANENT—TYPE WELL PACKER
`PERMANENT-TYPE WELL PACKER
`
`3,062,291
`3,062,291
`
`3 Sheets-Sheet 5
`3 Sheets-Sheet 5
`
` .""
`
`* j/AY/A
`__m
`
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`
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`C/CE/70 C. BROWN
`C/CERO 6. BROWN
`INVENTOR.
`IN V EN TOR.
`
`BY &/
`.
`BY
`,éh e .
`ATTORNEY.
`ATTORNEY
`
`

`
`United States Patent O?lice
`3,062,291
`United States Patent Office
`3,052,291
`Patented Nov. 6, 1962
`Patented Nov. 6, 1962
`
`1
`1
`3,062,291
`3,062,291
`_
`PERMANENT-TYPE WELL_ PACKER
`_
`PERMANENT-TYPE WELL PA€KER
`Cicero C. Brown, Houston, Tex., assignor to Brown Gil
`Cicero C. Brown, Houston, Tex., assignor to Brown Oil
`Tools, Inc., Houston, Tex., a corporation of Texas
`Tools, Inc., Houston, Tex., a corporation of Texas
`Filed May 11, 1959, Ser. No. 812,263
`Filed May 11, 1959, Ser. No. 812,263
`9 Claims.
`(Cl. 166-119)
`9 Claims. (Si. 166-119)
`
`This invention relates to well packers and Pafticl-113T1Y
`This invention relates to well packers and particularly
`to well packers of the so-called “permanent-type”‘pack
`to well packers of the so-called “permanent-type”‘pack-
`ers. These packers are designed, when once set in the
`ers. These packers are designed, when once set in the
`well, to remain permanently, but are ordinarily con
`well,
`to remain permanently, but are ordinarily con-
`structed of materials such that they may be readily de-
`structed of materials such that they may be readily de
`stroyed by drilling tools when necessary or desirable to
`stroyed by drilling tools when necessary or desirable to
`remove them.
`remove them.
`More conventional types of packers of the general
`More conventional
`types of packers of. the general
`character described are designed to ‘be run either on Wire
`character described are designed to ‘be run either on wire
`line setting strings or on tubing strings.
`in both cases,
`line setting strings or on tubing strings. in both cases,
`however, these conventional packers require that the set
`however, these conventional packers require that the set-
`ting strings and setting tools, whether a wire line or tub-
`ting strings and setting tools, whether a wire line or tub
`ing string is employed, must be removed from the well
`ing string is employed, must be removed from the Well
`before the string of production tubing is run into the
`before the string of production tubing is run into the
`well and connected to the packer. These more conven
`well and connected to the packer. These more conven-
`tional types of packers, therefore, require a multiplicity
`tional types of packers, therefore, require a multiplicity
`of operations before the well is equipped for production,
`of operations before the well is equipped for production,
`and in these operations, control of the well is not feas-
`and in these operations, control of the well is not feas
`ible or as complete as is desirable, particularly when high
`ible or as complete as is desirable, particularly when high
`pressures are present in the -formations penetrated by the
`pressures are present in the ‘formations penetrated by the
`well bore.
`well bore.
`The present invention has for its principal object the
`The present invention has for its principal object the
`provision of a permanent-type drillable packer which
`provision of a permanent-type drillable packer which
`overcomes the major disadvantages of existing desigflsi
`overcomes the major disadvantages of existing designs,
`such as are noted above,
`in that it may be run on the
`such as are noted above, in that it may be run on the
`production tubing string itself, and before any circula-
`production tubing string itself, and before any circula
`tion operations or manipulation operations to set
`the
`tion operations or manipulation operations to set the
`packer, may be placed in final position in the Christmas
`packer, may be placed in ?nal position in the Christmas
`tree and thereby permit
`the blowout preventers to be
`tree and thereby permit the blowout preventers to be
`removed. This permits maintaining the well under com-
`removed. This permits maintaining the well under com
`plete control throughout the subsequent operations of pre-
`plete control throughout the subsequent operations of pre
`paring the well for production and setting the packer;
`paring the well for production and setting the packer;
`that is, the mud materials may -be circulated out of the
`that is, the mud materials may be circulated out of the
`well and the face of the sand or other producing forma-
`well and the face of the sand or other producing forma
`tion washed to the point at which it is ready to flow be-
`tion washed to the point at which it is ready to flow be
`fore the packer is even set. No setting tools are required
`fore the packer is even set. No setting tools are required
`to be removed and the entire setting operation is greatly
`to be removed and the entire setting operation is greatly
`simplified and conducted under secure well control con-
`simpli?ed and conducted under secure well control con
`ditions.
`ditions.
`An important object of the present
`invention is to
`An important object of the present invention is to
`provide a form of packer of the type described in which
`provide a form of packer of the type described in which
`the packer is set hydraulically, thereby minimizing the
`the packer is set hydraulically,
`thereby minimizing the
`mechanical manipulations which are -frequently trouble-
`mechanical manipulations which are ‘frequently trouble
`some in setting packers.
`some in setting packers.
`Another important object resides in the employment
`Another important object resides in the employment
`of a packer structure having oppositely acting anchor and
`of a packer structure having oppositely acting anchor and
`seal assemblies operable to anchor the structure in the
`seal assemblies operable to anchor the structure in the
`Well casing against movement
`in either direction while
`Well casing against movement in either direction while
`sealing with the well casing, and employing a hydrauli-
`sealing with the well casing, and employing a hydrauli
`cally-actuated piston and cylinder arrangement for set-
`cally-actuated piSton and cylinder arrangement for set
`ting the anchor and seal elements of the assemblies.
`ting the anchor and seal elements of the assemblies.
`Still another ob;'—ect is the provision of a hydraulically-
`Still another obiect is the provision of a hydraulically
`actuated packer structure of the type described, having
`actuated packer structure of the type described, having
`a valve member for closure the bore of the packer struc-
`a valve member for closure the bore of the packer struc
`ture upon withdrawal of the operating stem in order to
`ture upon withdrawal of the operating stem in order to
`prevent back-flow of pressure fluid from below the
`prevent back-?ow of pressure ?uid from below the
`packer when the operating stem is out of the packer.
`packer when the operating stem is out of the packer.
`A more specific object is the provision of two longi-
`A more speci?c object is the provision of two longi
`tudinally spaced releasable latch mechanisms for releas-
`tudinally spaced releasable latch mechanisms for releas
`ably securing the operating stern in the packer ‘body and
`ably securing the operating stem in the packer body and
`which will prevent premature setting of the packer.
`which will prevent premature setting of the packer.
`Other and more specific objects and advantages of this
`Other and more speci?c objects and advantages of this
`invention will become more readily apparent from the
`invention will become more readily apparent from the
`following detailed description when read in conjunction
`following detailed description when read in conjunction
`
`U!
`
`10
`10
`
`30
`30
`
`4.0
`4.0
`
`(IICR
`
`60
`60
`
`65
`65
`
`70
`
`2
`2
`with the accompanying drawing which illustrates a useful
`with the accompanying drawing which illustrates a useful
`embodiment in accordance with this invention.
`embodiment in accordance with this invention.
`in the drawing:
`In the drawing:
`FIGS. 1 and 2 are longitudinal, partly sectional, views,
`FIGS. 1 and 2 are longitudinal, partly sectional, views,
`showing the packer structure positioned in a well casing
`showing the packer structure positioned in a well casing
`and illustrating two stages in the operation of the packer;
`and illustrating two stages in the operation of the packer;
`FIG. 3 is a view generally similar to FIG. 2, but show-
`FIG. 3 is a view generally similar to FIG. 2, but show
`ing the operating stem withdrawn and the back pressure
`ing the operating stem Withdrawn and the back pressure
`valve in the closed position;
`valve in the closed position;
`FIG. 4 is a cross-sectional View along line 4-4 of
`FIG. 4 is a cross-sectional view along line 4-4 of
`FIG. 1;
`FIG. 1;
`FEGS. 5 and 6 are enlarged fragmentary views illus-
`FIGS. 5 and 6 are enlarged fragmentary views illus
`trating some of the details of the packer structure;
`trating some of the details of the packer structure;
`FIGS. 7 and 8 are schematic views illustrating the
`FIGS. 7 and 8 are schematic views illustrating the
`packer employed with a single string of tubing, FIG. 8
`packer employed with a single string of tubing, FIG. 8
`showing the tubing string being withdrawn from the
`showing the tubing string being withdrawn from the
`packer; and
`packer; and
`FIGS. 9 and 10 are schematic views, generally similar
`FIGS. 9 and 10 are schematic views, generally similar
`to FIGS. 7 and 8, illustrating the present invention em-
`to FIGS. 7 and 8, illustrating the present invention em
`ployed in conjunction with an additional packer in mul-
`ployed in conjunction with an additional packer in mul~
`tiple well completions.
`tiple well completions.
`Referring to the drawing, and more particularly to
`Referring to the drawing, and more particularly to
`FIGS. 1 and 2, the packer structure S comprises a gener-
`FIGS. 1 and 2, the packer structure S comprises a gener
`ally tubular body 10 having its upper end threadedly re-
`ally tubular body 10 having its upper end threadedly re
`ceived in the bore of an upper collar 11 provided with a
`ceived in the bore of an upper collar 11 provided with a
`lip 12 which extends inwardly over the upper end of body
`lip 12 which extends inwardly over the upper end of body
`10 and forms a short flush extension thereof. The upper
`10 and forms a short ?ush extension thereof. The upper
`end of lip 12 is chambered to provide a seat 13, for pur-
`end of lip 12 is chambered to provide a seat 13, for pur
`poses to be described subsequently. The lower end of
`poses to be described subsequently. The lower end of
`body 10 is threadedly received in a lower collar 1112.
`body 10 is threadedly received in a lower collar 11b.
`Collars 11 and 11b define external longitudinally spaced
`Collars 11 and 11b de?ne external longitudinally spaced
`opposed shoulders 11a and lie, respectively, about the
`opposed shoulders 11a and 110, respectively, about the
`exterior of body 10 against which are seated a pair of
`exterior of body 10 against which are seated a pair of
`longitudinally spaced upper and lower anchor-and-seal
`longitudinally spaced upper and lower anchor-and-seal
`assemblies of identical form, each designated generally
`assemblies of identical form, each designated generally
`by the numeral 15.
`by the numeral 15.
`Each of the assemblies 15 comprises the following
`Each of the assemblies 15 comprises the following
`successively arranged elements: an annular resilient seal
`successively arranged elements: an annular resilient seal
`element 17 constructed of rubber or other flexible resil-
`element 17 constructed of rubber or other ?exible resil
`ient composition material abutting shoulders 11a and He;
`ient composition material abutting shoulders 11a and file;
`an expander 18 having one end abutting seal element 17
`an expander 18 having one end abutting seal element 17
`and having a conical surface 19 tapering inwardly to-
`and having a conical surface 19 tapering inwardly to
`ward body 10; a set of wedge-shape pipe-gripping slips
`ward body 10; a set of wedge-shape pipe-gripping slips
`20 which are secured to the expander in longitudinally
`20 which are secured to the expander in longitudinally
`retracted position by means of a shear screw 21 which
`retracted position by means of a shear screw 21 which
`extends through registering openings in the adjacent tip
`extends through registering openings in the adjacent tip
`portions of slips 20 and expander 18. The inner faces
`portions of slips 20 and expander 18. The inner faces
`of slips 20 have outwardly tapering surfaces complement
`of slips 2% have outwardly tapering surfaces complement-
`ing the taper of surface 19. The inner end of shear
`ing the taper of surface 19. The inner end of shear
`screw 21 is reduced in diameter to form the end portion
`screw 21 is reduced in diameter to form the end portion
`22 which extends into a recess 23 provided in the exte-
`22 which extends into a recess 23 provided in the exte
`rior of body 10 (FIG. 6).
`rior of body 10 (FIG. 6).
`End portions 22 of the shear screws 21 will be di-
`End portions 22 of the shear screws 21 will be di
`mensioned to have substantially lesser breaking strength
`mensioned to have substantially lesser breaking strength
`than the bodies of shear screws 21. As an example of
`than the bodies of shear screws 21. As an example of
`the relative strengths which will function satisfactorily
`the relative strengths which will function satisfactorily
`for the purposes of this invention, portions 22 may be
`for the purposes of this invention, portions 22 may be
`made to have a breaking strength such that it will shear
`made to have a breaking strength such that it will shear
`when the pressure in the hydraulic cylinder, to ‘be de
`when the pressure in the hydraulic cylinder, to be de-
`scribed later, attains about 1000 lbs. per square inch,
`scribed later, attains about 1000 lbs. per square inch,
`while the larger portions of the shear screws will be made
`while the larger portions of the shear screws will be made
`to break when said pressure attains about 3000 lbs. per
`to break when said pressure attains about 3000 lbs. per
`square inch. These values may, of course, be varied de
`square inch. These values may, of course, be varied de-
`pending on the service conditions obtaining in each in-
`pending on the service conditions obtaining in each in
`stance. By this arrangement, it will ‘be seen that shear
`stance. By this arrangement, it will ‘be seen that shear
`screw 21 secures the slips 20 to expander 18 against rela
`screw 21 secures the slips 20 to expander 18 against rela-
`tive movement therebetween and also simultaneously se
`tive movement therebetween and also simultaneously se-
`cures both of these elements to body 10, also against
`cures both of these elements to body 10, also against
`movement relative thereto, the slip expander being there
`movement relative thereto, the slip expander being there-
`by initially held in retracted or non-setting position. It
`by initially held in retracted or non-setting position.
`It
`Will be seen that the upper and lower anchor-and-seal
`will be seen that the upper and lower anchor-and-seal
`assemblies, expanders 13 tapering inwardly toward each
`assemblies, expanders 18 tapering inwardly toward each
`
`

`
`10
`10
`
`15
`15
`
`20
`20
`
`30
`30
`
`40
`
`3
`3
`other, are arranged to act in opposite directions so that
`other, are arranged to act in opposite directions so that
`actuation of the assemblies will anchor the packer struc-
`actuation of the assemblies will anchor the packer struc
`ture against movement
`in either direction when the
`ture against movement in either direction when the
`structure has been set in a well casing, as will be subse-
`structure has been set in a well casing, as will be subse
`quently described.
`quently described.
`Positioned concentrically about the exterior of body 10,
`Positioned concentrically about the exterior of body 10,
`between the upper and lower anchor-and-seal assemblies
`between the upper and lower anchor-and-seal assemblies
`15,
`is an actuating assembly, designated generally by the
`15, is an actuating assembly, designated generally by the
`numeral 25, which comprises a tubular cylinder 27 con-
`numeral 25, which comprises a tubular cylinder 27 con
`centrically surrounding a piston 26 and secured at its
`centrically surrounding a piston 26 and secured at its
`upper end to an annular head 28 forming a closure for the
`upper end to an annular head 28 forming a closure for the
`upper end of the cylinder. Cylinder 27 is longitudinally
`upper end of the cylinder. Cylinder 27 is longitudinally
`slidable relative to piston 26. The latter is provided, at
`slidable relative to piston 26. The latter is provided, at
`its lower end, with an annularly enlarged head 29 de-
`its lower end, with an annularly enlarged head 29 de
`fining an upwardly facing annular shoulder 30 forming a
`?ning an upwardly facing annular shoulder 30 forming a
`limit stop for the lower end of cylinder 27. The lower
`limit stop for the lower end of cylinder 27. The lower
`end of head 29 abuts against the base of lower slips 2%),
`end of head 29 abuts against the base of lower slips 2%),
`while the upper end of head 28 similarly abuts against
`while the upper end of head 28 similarly abuts against
`the base of upper slips 20. Piston 26 is provided with
`the base of upper slips 20. Piston 26 is provided with
`an internal seal 31 to form a fluid-tight seal between the
`an internal seal 31 to form a ?uid-tight seal between the
`piston and the exterior of body 10 and is provided, near
`piston and the exterior of body 10 and is provided, near
`its upper end, with an external seal 32 to seal between
`its upper end, with an external seal 32 to seal between
`the exterior of the piston and cylinder 27. Head 28 of
`the exterior of the piston and cylinder 27. Head 28 of
`the cylinder is similarly provided with an internal seal 33
`the cylinder is similarly provided with an internal seal 33
`for sealing between body 16- and head 28 and an external
`for sealing between body 10- and head 28 and an external
`seal 34 for sealing between the head 28 and cylinder 27.
`seal 34 for sealing between the head 28 and cylinder 27.
`In the fully telescoped position, illustrated in FIG. 1, a
`In the fully telescoped position, illustrated in FIG. 1, a
`space is provided between piston 26 and head 28 de?ning
`space is provided between piston 26 and head 28 defining
`a piston chamber 35. One or more radial ports 36 are
`a piston chamber 35. One or more radial ports 36 are
`provided through the wall of body 10 communicating
`provided through the wall of body 10 communicating
`with chamber 35 for admission thereto of pressure fluid,
`with chamber 35 for admission thereto of pressure ?uid,
`as will be subsequently described.
`as will be subsequently described.
`Body 10 has an axial bore 37 into which extends a tu-
`Body 10 has an axial bore 37 into which extends a tu
`bular operating stem or mandrel, designated generally by
`bular operating stem or mandrel, designated generally by
`the numeral 38. Mandrel 38 comprises co-axially con-
`the numeral 38. Mandrel 38 comprises co-axially con
`nected upper, intermediate, and lower sections 38a, 38b
`nected upper, intermediate, and lower sections 38a, 38b
`and 38c, respectively. The external diameters of upper
`and 38c, respectively. The external diameters of upper
`sections 38a is somewhat smaller than that of intermedi-
`sections 38a is somewhat smaller than that of intermedi
`ate section 38b and is threaded at
`its lower end for
`ate section 38b and is threaded at its lower end for
`threaded reception in an internally threaded socket 39
`threaded reception in an internally threaded socket 39
`formed in the upper end of intermediate section 3535.
`formed in the upper end of intermediate section 38b.
`The larger external diameter of the latter defines an an-
`The larger external diameter of the latter de?nes an an
`nular upwardly facing shoulder 40 about the lower end
`nular upwardly facing shoulder 40 about the lower end
`of the upper section 3811. The lower end of intermediate
`of the upper section 38a. The lower end of intermediate
`section 38b is reduced in diameter to define the down-
`section 38b is reduced in diameter to de?ne the down
`wardly facing shoulder 41 about the lower end of inter-
`wardly facing shoulder 41 about the lower end of inter
`mediate section 3312 and the reduced lower end portion
`mediate section 3811 and the reduced lower end portion
`of the latter is externally threaded to form the pin con-
`of the latter is externally threaded to form the pin con
`nection 42 for reception in a coupling collar 43, the lower
`nection 42 for reception in a coupling collar 43, the lower
`end of which threadedly receives the upper end of lower
`end of which threadedly receives the upper end of lower
`mandrel section 38c to complete the connections between
`mandrel section 38c to complete the connections between
`the mandrel sections. The upper end of collar 43 forms
`the mandrel sections. The upper end of collar 43 forms
`an upwardly facing shoulder 44 spaced from shoulder 41
`an upwardly facing shoulder 44 spaced from shoulder 41
`and a packing 45 is mounted about pin connection 42 in
`and a packing 45 is mounted about pin connection 42 in
`the space between these shoulders for compression there-
`the space between these shoulders for compression there
`between when the pin connection is screwed into collar
`between when the pin connection is screwed into collar
`43 whereby to cause packing 45 to form a fluid-tight slid-
`43 whereby to cause packing 45 to form a ?uid~tight slid
`able seal between mandrel 38 and body 10.
`able seal between mandrel 38 and body 10.
`At its upper end, upper mandrel section 33a is exter-
`At its upper end, upper mandrel section 33a is exter
`nally enlarged forming the head 46 and de?ning the down
`nally enlarged forming the head 46 and defining the down-
`wardly facing external shoulder 47. Head 46 is provided
`wardly facing external shoulder 47. Head 46 is provided
`with the internally threaded socket 48 by which the man-
`with the internally threaded socket 48 by which the man
`drel 38 may be secured to the lower end of a tubing
`drel 38 may be secured to the lower end of a tubing
`string 50. The latter (FIG. 7) extends upwardly through
`string 50. The latter (FIG. 7) extends upwardly through
`a well casing C and a wellhead H at the surface. A valve
`a Well casing C and a wellhead H at the surface. A valve
`V controls flow through the tubing string.
`V controls flow through the tubing string.
`The exterior of intermediate mandrel section 38b is re-
`The exterior of intermediate mandrel section 38b is re
`duced somewhat in diameter over a portion of its length
`duced somewhat in diameter over a portion of its length
`to form the annular chamber 51 between intermediate sec-
`to form the annular chamber 51 between intermediate sec
`tion 38b and the interior wall of body 10. The reduc-
`tion 38b and the interior wall of body 10. The reduc~
`tion in diameter of section 3817 defines at its lower end
`tion in diameter of section 38b de?nes at its lower end
`the downwardly and outwardly tapering annular shoulder
`the downwardly and outwardly tapering annular shoulder
`52. One or more radial ports 53 are provided through
`52. One or more radial ports 53 are provided through
`the wall of section 38b above shoulder 52 to provide fluid
`the wall of section 38b above shoulder 52 to provide ?uid
`communication between the bore of mandrel 38 and cham-
`communication between the bore of mandrel 38 and cham
`
`3,062,291
`3,062,291
`
`4
`4
`It will be seen from the arrangement of these
`her 51.
`her 51. It will be seen from the arrangement of these
`parts that when mandrel 38 is in the fully telescoped posi
`parts that when mandrel 38 is in the fully telescoped posi-
`tion, illustrated in FIG. 1, chamber 51 will be in com-
`tion, illustrated in FIG. 1, chamber 51 will be in com
`munication with ports 36 and thence with piston chamber
`munication with ports 36 and thence with piston chamber
`35, while the seal formed by packing 45 will be posi
`35, while the seal formed by packing 45 will be posi-
`tioned below ports 36 and 53.
`tioned below ports 36 and 53.
`Upper collar 11 is counter-bored above the lip 12 to
`Upper collar 1-1 is counter-bored above the lip 12 to
`form the internally threaded socket 55 into which is
`form the internally threaded socket 55 into which is
`screwed a short tubular extension 56 having at its upper
`screwed a short tubular extension 56 having at its upper
`end the inwardly bevelled seat 57 adapted to be engaged
`end the inwardly bevelled seat 57 adapted to be engaged
`by shoulder 47 when mandrel 38 is fully telescoped into
`by shoulder 47 when mandrel 38 is fully telescoped into
`body 10. Extension 56 forms part of an upper latch mech-
`body 10. Extension 56 forms part of an upper latch mech
`anism by which the upper end portion of mandrel 38 may
`anism by which the upper end portion of mandrel 38 may
`be releasably secured to the packer body and which permits
`be releasably secured to the packer body and which permits
`the mandrel to be withdrawn from the body, after the
`the mandrel to be withdrawn from the body, after the
`packer is set, by application of a straight upward pull to
`packer is set, by application of a straight upward pull to
`the mandrel. This latch mechanism is disclosed and de-
`the mandrel. This latch mechanism is disclosed and de
`scribed in greater detail
`in my co-pending application
`scribed in greater detail in my co-pending application
`Serial No. 756,522, filed August 28, 1958 for a “Coupling
`Serial No. 756,522, ?led August 28, 1958 for a “Coupling
`Device.”
`Device.”
`This latch mechanism comprises a ring 60 which is sup-
`This latch mechanism comprises a ring 60 which is sup
`ported on upper mandrel section 38a on a narrow ledge
`ported on upper mandrel section 380 on a narrow ledge
`61 spaced a slight distance below shoulder 47. Ring 60
`61 spaced a slight distance below shoulder 47. Ring 60
`has formed integrally therewith a plurality of angularly
`has formed integrally therewith a plurality of angularly
`spaced depending ?ngers 62 of resilient construction and
`spaced depending fingers 62 of resilient construction and
`having pawls or dogs 63 on their lower ends which project
`having pawls or dogs 63 on their lower ends which project
`radially into a counter-bore 64 in the lower end of exten-
`radially into a counter-bore 64 in the lower end of exten
`sion 56, the upper end of the counter-bore terminates at
`sion 56, the upper end of the counter-bore terminates at
`the downwardly bevelled shoulder 13. Dogs 63 have
`the downwardly bevelled shoulder 13. Dogs 63 have
`their upper and lower ends tapered to complement shoul
`their upper and lower ends tapered to complement shoul-
`ders 65 and 70, respectively.
`ders 65 and 70, respectively.
`A keeper sleeve 66 is slidably mounted on mandrel sec-
`A keeper sleeve 66 is slidably mounted on mandrel sec~
`tion 38a between the latter and the upper end of body 10,
`tion 38a between the latter and the upper end of body 10,
`the keeper sleeve being positioned above shoulder 40. A
`the keeper sleeve being positioned above shoulder 40. A
`packing 67 is mounted about mandrel section 38a below
`packing 67 is mounted about mandrel section 38a below
`keeper sleeve 66, and a thrust ring 68 is positioned below
`keeper sleeve 66, and a thrust ring 68 is positioned below
`packing 67 and urged thereagainst by a coil spring 69 dis
`packing 67 and urged thereagainst by a coil spring 69 dis-
`posed between shoulder 40 and ring 68. Spring 69 not
`posed between shoulder 40 and ring 68. Spring 69 not
`only compresses packing 67, thereby forming a slidable
`only compresses packing 67, thereby forming a slidable
`seal -between mandrel section 38a and body 10, but also
`seal between mandrel section 38a and body 10, but also
`urges keeper sleeve 66 upwardly. The upper end of
`urges keeper sleeve 66 upwardly. The upper end of
`keeper sleeve 66 has a downwardly and outwardly and
`keeper sleeve 66 has a downwardly and outwardly and
`bevelled end face 70 adapted to engage a similarly sloping
`bevelled end face 70 adapted to engage a similarly sloping
`end face on dogs 63, thereby being operable to urge the
`end face on dogs 63, thereby being operable to urge the
`dogs outwardly into counterbore 64, and to cause the
`dogs outwardly into counterbore 64, and to cause the
`dogs to engage shoulder 65 when the keeper sleeve moves
`dogs to engage shoulder 65 when the keeper sleeve moves
`upwardly to the position shown in FIG. 2, in a manner
`upwardly to the position shown in FIG. 2, in a manner
`to be subsequently described. A narrow shoulder 71 lim-
`to be subsequently described. A narrow shoulder 71 lim
`its the upward movement of keeper sleeve 66 on mandrel
`its the upward movement of keeper sleeve 66 on mandrel
`section 38a to prevent keeper sleeve 66 from attaining a
`section 38a to prevent keeper sleeve 66 from attaining a
`point above dogs 63. The operation of the latch mech
`point above dogs 63. The operation of the latch mech-
`anism will be described more fully hereinafter.
`anism will be described more fully hereinafter.
`Body 10 is provided with a plurality of circumferen-
`Body 10 is provided with a plurality of circumferen
`tially spaced radial openings 73 which are constricted
`tially spaced radial openings 73 which are constricted
`slightly at their outer ends at 74 to define sockets for the
`slightly at their outer ends at 74 to de?ne sockets for the
`reception of ‘ball-shaped latches 75 which project out-
`reception of ‘ball-shaped latches 75 which project out
`wardly through the constricted end 74 into engagement
`wardly through the constricted end 74 into engagement
`with shoulder 52 when the mandrel member is fully tele-
`with shoulder 52 when the mandrel member is fully tele
`scoped in body 10, as illustrated in FIGS. 1 and 5.
`In its
`scoped in body 10, as illustrated in FIGS. 1 and 5. In its
`fully retracted position, piston member 26 will extend
`fully retracted position, piston member 26 will extend
`upwardly past ball latches 75, the clearance between pis-
`upwardly past ball latches 75, the clearance between pis
`ton 26 and body 10 being such that the outer surface of
`ton 26 and body 10 being such that the outer surface of
`the piston will hold the balls in engagement with shoulder
`the piston will hold the balls in engagement with shoulder
`52,
`thereby providing a latching arrangement by which
`52, thereby providing a latching arrangement by which
`mandrel 38 cannot be drawn upwardly relative to body
`mandrel 38 cannot be drawn upwardly relative to body
`10 while the ball latches are engaged with shoulder 52.
`10 while the ball latches are engaged with shoulder 52.
`When piston member 26 has moved downwardly in re-
`When piston member 26 has moved downwardly in re
`sponse to hydraulic pressure, as ‘best seen in FIGS. 2 and
`sponse to hydraulic pressure, as ‘best seen in FIGS. 2 and
`3, ball
`latches 75 will be released for movement out-
`3, ball latches “75 will be released for movement out
`wardly of openings 73 into chamber 35 and when so re-
`wardly of openings 73 into chamber 35 an