(12) United States Patent
`Connell et al.
`
`USOO6196325B1
`(10) Patent No.:
`US 6,196,325 B1
`(45) Date of Patent:
`Mar. 6, 2001
`
`(54) HEAVY-DUTY LOGGING AND
`PERFORATING CABLEHEAD FOR COILED
`TUBING AND METHOD FOR RELEASING
`WIRELINE TOOL
`
`(75) Inventors: Michael L. Connell; Robert G.
`Howard, both of Duncan; James C.
`Tucker, Springer, all of OK (US)
`(73) Assignee: Halliburton Energy Services, Inc.,
`Duncan, OK (US)
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 0 days.
`
`(*) Notice:
`
`(21) Appl. No.: 09/205,967
`22) Filled:
`Dec. 4, 1998
`(22) File
`ec. 4,
`(51) Int. Cl. ............................. E21B 19/00, E21B 23/00
`(52) U.S. Cl. ..................... 166/377; 166/65.1; 166/242.6;
`166/384; 166/385
`(58) Field of Search ..................................... 166/377,384,
`166/385, 65.1, 77.2, 242.6, 242.7
`
`(56)
`
`References Cited
`U.S. PATENT DOCUMENTS
`2/1961 Reesby ................................, 339/7
`2.971,178
`4.279,304 * 7/1981 Harper ............................. 166/307 X
`4,624,308
`11/1986 White .................................. 166/65.1
`4,874,327
`10/1989 Ip ......................................... 439/275
`
`5/1990 Roessler ............................... 166/250
`4,928,764
`4997,041 * 3/1991 Petree
`... 166/377
`5,043,949
`8/1991. Shechter
`... 367/76
`5,109,921
`5/1992 Aracena ......
`... 166/65.1
`5,323,853
`6/1994 Leismer et al. .................. 166/377 X
`5,398,753 * 3/1995 Obrejanu et al.
`... 166/66.4 X
`5,477,921 * 12/1995 Tollefsen .........
`... 166/65.1 X
`5,505,261
`4/1996 Huber et al. ......................... 166/297
`5,580,114 * 12/1996 Palmer ........
`... 294/86.15
`5,947,198 * 9/1999 McKee et al. ................... 166/377 X
`6,032,733 * 3/2000 Ludwig et al. ................. 166/65.1 X
`* cited by examiner
`Primary Examiner Eileen D. Lillis
`Assistant Examiner Jong-Suk Lee
`(74) Attorney, Agent, or Firm-Robert A. Kent; Neal R.
`Kennedy
`ABSTRACT
`(57)
`A heavy-duty logging and perforating cablehead for coiled
`tubing. The cablehead includes an upper and lower housing
`which are shearably connected by Shear pins. An actuating
`piston is slidably disposed in the housing. When the piston
`is in a running position, the piston holds a lug in locking
`engagement with the upper and lower housingS Such that the
`Shear pins cannot be sheared. When the piston is moved to
`a releasing position, the lugs are released So that the upper
`and lower housings may be separated, thereby shearing the
`Shear pins. Actuation of the piston is accomplished by
`pumping fluid down the coiled tubing and through a flow
`path in the cablehead and by applying pressure to the piston.
`
`31 Claims, 8 Drawing Sheets
`
`110,4
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`U.S. Patent
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`Mar. 6, 2001
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`Sheet 1 of 8
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`US 6,196,325 B1
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`U.S. Patent
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`Mar. 6, 2001
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`Sheet 2 of 8
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`US 6,196,325 B1
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`U.S. Patent
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`US 6,196,325 B1
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`U.S. Patent
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`Mar. 6, 2001
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`Sheet 4 of 8
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`U.S. Patent
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`US 6,196,325 B1
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`U.S. Patent
`
`Mar. 6, 2001
`
`Sheet 6 of 8
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`US 6,196,325 B1
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`U.S. Patent
`
`Mar. 6, 2001
`
`Sheet 8 of 8
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`US 6,196,325 B1
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`

`

`1
`HEAVY-DUTY LOGGING AND
`PERFORATING CABLEHEAD FOR COILED
`TUBING AND METHOD FOR RELEASING
`WIRELINE TOOL
`BACKGROUND OF THE INVENTION
`1. Field of the Invention
`This invention relates to cableheads for coiled tubing
`logging operations, the cableheads having mechanical
`devices for releasing a stuck tool, and more particularly, to
`a cablehead which allows releasing of a tool when desired
`while preventing accidental and premature release of the
`tool.
`2. Description of the Prior Art
`In heavy-duty logging and/or perforating operations, the
`logging tool and/or perforating guns may be run into the well
`using coiled tubing electric line reels. This technique is used
`particularly often on deviated or horizontal wells. Typically,
`a cablehead is positioned between the end of the length of
`coiled tubing and the logging tool and/or perforating guns.
`The cablehead has a means for mechanically connecting the
`tubing to the tool or guns and also for providing an electrical
`connection between a logging cable run down the inside of
`the coiled tubing and the logging tool or perforating guns.
`Many of these cableheads also include a means for releasing
`the tool or guns in the event that the tool or guns becomes
`stuck in the well.
`Prior to the present invention, most cableheads for coiled
`tubing logging operations have relied on mechanical dis
`connects to provide a means of releasing in the event of a
`Stuck tool Situation. With Such a mechanical disconnect, the
`coiled tubing is generally released from the Stuck tool or gun
`by applying a predetermined amount of tension on the coiled
`tubing, thereby breaking a Set of Shear pins in the cablehead.
`Once the Shear pins are broken, the coiled tubing is removed
`from the well, and the Stuck tool or perforating gun may be
`fished out on a Subsequent trip into the well.
`A problem with the prior art mechanical disconnect
`portion of these cableheads is that there is a tendency to
`accidentally shear during perforating operations. When the
`guns are shot in Wells that are Substantially horizontal, this
`is not much of a problem because the vertical, or axial, shock
`loading is Substantially negligible. However, when a well is
`deviated at a shallower angle, for example 60, a Substantial
`Vertical shock load component is created when the guns are
`fired. Often, this vertical Shock load is enough to prema
`turely shear the shear pins in the cablehead. Obviously when
`this happens, the guns are released and left in the well
`unintentionally.
`Another problem with the mechanical disconnect portion
`of these prior art cableheads is that there are limitations
`when the Shear load for shearing the pins is Selected. The
`natural tendency of a tool operator is to Select shear pins
`with Strengths that are very high in order to prevent acci
`dentally releasing the tool or perforating guns when in the
`well. However, the tensile strength of the coiled tubing is
`also a factor which must be considered when making the
`Shear pin Selection. For example, in a deep well, the weight
`of the coiled tubing String hanging in the well may be So high
`that the available over-pull at the surface is limited to a few
`thousand pounds. If the operator pulls on the tubing String at
`a higher load than this, there is the risk of parting the tubing
`at the Surface, thereby leaving the entire tubing String and
`tool in the well which, of course, is a very undesirable
`Situation.
`The present invention Solves this problem by providing a
`locking means Such as a Set of lugs to Securely lock the
`
`15
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`25
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`35
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`US 6,196,325 B1
`
`2
`components of the cablehead together So that no loading is
`prematurely applied to the shear pins. The Shear pins may
`only be sheared after fluid is pumped down the coiled tubing
`and pressure applied to actuate a piston in the cablehead to
`release the lugs. So that a shearing force may then be applied
`to the shear pins. Thus, there can be no premature shearing
`as in prior art mechanical disconnects.
`SUMMARY OF THE INVENTION
`The present invention is a cablehead for use with coiled
`tubing electric line in well operations. The cablehead com
`prises a housing and an actuating piston Slidably disposed in
`the housing. The housing comprises an upper housing
`adapted for connection to a length of coiled tubing, a lower
`housing adjacent to the upper housing, and a shearing means
`for Shearably attaching the lower housing to the upper
`housing. The cablehead further comprises a locking means,
`disposed between the upper and lower housings, for pre
`venting Shearing of the Shearing means when the locking
`means is in a locked position and allowing Shearing of the
`Shearing means by relative movement between the upper
`and lower housing when the locking means is in an unlocked
`position. The piston has a running position holding the
`locking means in the locked position and is movable to a
`releasing position allowing movement of the locking means
`to the unlocked position.
`The cablehead further comprises biasing means in the
`housing for biasing the piston toward the running position
`thereof. In the preferred embodiment, the biasing means is
`characterized by a compression Spring.
`The housing and piston define a first flow path therein
`through which fluid may be circulated when the piston is in
`the running position. A nozzle is disposed across the first
`flow path for controlling a fluid flow rate therethrough. This
`nozzle is one of a plurality of interchangeable nozzles which
`may have various sizes of orifices or ports therein. This first
`flow path is closed when the piston is in the releasing
`position.
`The housing also defines a Second flow path therethrough
`whereby fluid may be circulated when the piston is in the
`releasing position.
`The piston has a saddle thereon which is aligned with the
`locking means when the piston is in the releasing position
`thereof So that the releasing means may be moved inwardly
`into the Saddle. The piston comprises an upper piston on
`which the Saddle is located and a prop attached to the upper
`piston.
`The apparatus may also comprise a Spring rest disposed in
`the housing and a Second shearing means for shearably
`attaching the Spring rest to the housing. This Second shearing
`means is Sheared when the piston is moved to the releasing
`position thereof. In the preferred embodiment, the Spring is
`engaged with the piston and Spring rest and disposed ther
`ebetween.
`The upper housing defines a receSS therein, and the lower
`housing defines a lug window therein aligned with the
`receSS. The locking means is characterized, in the preferred
`embodiment, by a lug disposed in the window and extending
`into the receSS when in the locked position and Spaced from
`the receSS when in the unlocked position. The lug extends
`into the Saddle on the piston when the lug is in the unlocked
`position.
`The present invention also includes a method of releasing
`a wireline tool in a well. This method comprises the step of
`providing a cablehead for connecting the wireline tool to a
`length of coiled tubing. This cablehead may be said to
`
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`US 6,196,325 B1
`
`3
`generally comprise a housing having an upper housing
`connectable to the coiled tubing and a lower housing shear
`ably attached to the upper housing and connectable to the
`wireline tool, a lug disposed in the housing for preventing
`Shearing disconnection of the upper and lower housings
`when the lug is in a locked position and allowing shearing
`disconnection of the upper and lower housings when the lug
`is in an unlocked position, and a piston disposed in the
`housing and movable between a running position holding
`the lug in the locked position and a releasing position
`allowing the lug to be moved to the unlocked position.
`The method further comprises the Steps of running the
`coiled tubing, cablehead and wireline tool into the wellbore
`with the piston in the running position thereof, pumping
`fluid down the coiled tubing and applying pressure to the
`piston and thereby moving the piston to the releasing
`position, applying tension to the coiled tubing Such that the
`lug is moved to the unlocked position Substantially Simul
`taneously with the upper housing being Shearably discon
`nected from the lower housing, and removing the coiled
`tubing and the upper housing from the wellbore. The method
`may further comprise the Step of fishing the lower housing
`and the wireline tool from the wellbore. A fishing tool is
`engaged with a fishing neck defined in the lower housing
`when the upper housing has been disconnected from the
`lower housing.
`In the method, the cablehead may further comprise a
`Spring rest shearably connected to the housing, and a Spring
`disposed between the Spring rest for biasing the piston
`toward the running position. The Step of pumping fluid down
`the coiled tubing and applying pressure to the piston may
`comprise pumping fluid through the coiled tubing and
`cablehead at a volume sufficient to move the piston from the
`running position thereof to a Sealing position in which the
`piston engages the Spring Seat, and when the piston is in the
`Sealing position, applying preSSure thereto which thereby
`Shearably releases the Spring rest from the housing and
`moves the piston to the releasing position.
`Numerous objects and advantages of the invention will
`become apparent as the following detailed description of the
`preferred embodiment is read in conjunction with the draw
`ings which illustrate Such embodiment.
`BRIEF DESCRIPTION OF THE DRAWINGS
`FIGS. 1A-1D show the heavy-duty logging and perforat
`ing cablehead for coiled tubing of the present invention with
`an actuating piston in a running position with lugs in a
`locked position for running a logging tool and/or Set of
`perforating guns into a well on a length of coiled tubing.
`FIGS. 2A-2D show the cablehead with the actuating
`piston in a Sealing position and the lugs still in the locked
`position.
`FIGS. 3A-3D illustrate the cablehead with the actuating
`piston in a releasing position So that the lugs may be moved
`to the unlocked position.
`FIGS. 4A-4D illustrate the cablehead after tension has
`been applied to the tubing String to Separate upper and lower
`housings in the event of a Stuck tool.
`
`DESCRIPTION OF THE PREFERRED
`EMBODIMENT
`Referring now to the drawings, and more particularly to
`FIGS. 1A-1D, the heavy-duty logging and perforating
`cablehead for coiled tubing of the present invention is shown
`and generally designated by the numeral 10. Generally,
`
`4
`cablehead 10 comprises an outer housing 12 with an actu
`ating piston 14 Slidably disposed therein.
`Housing 12 comprises an upper housing 16 and a lower
`housing 18. Upper housing 16 and lower housing 18 each
`are formed by a number of components.
`Referring now to FIG. 1A, at the upper end of upper
`housing 16 is a top adapter 20 disposed in the upper end of
`a quick-connect collar 22. A Sealing means, Such as a pair of
`O-ringS 24, provides Sealing engagement between top
`adapter 20 and collar 22.
`Referring to FIG. 1B, a piston Sub 26 is attached to the
`lower end of collar 22 at threaded connection 28. A Sealing
`means, Such as a pair of O-rings 30, provides Sealing
`engagement between piston Sub 26 and collar 22.
`The lower end of piston Sub 26 is attached to a ported Sub
`32 at threaded connection 34.
`The lower end of ported Sub 32 is attached to a lug
`window Sub 36 at threaded connection 38. A sealing means,
`Such as an O-ring 40, provides Sealing engagement between
`ported Sub 32 and lug window Sub 36, as seen in FIG. 1C.
`Lower housing 18 is disposed below upper housing 16. At
`the upper end of lower housing 18 is a lug housing 42
`disposed adjacent to lug window Sub 36 and shearably
`connected thereto as will be further described herein.
`The lower end of lug housing 42 is connected to a center
`mandrel 44 at threaded connection 46. See FIGS. 1C and
`1D. A Sealing means, Such as an O-ring 48, provides Sealing
`engagement therebetween. A tool connector 50 is disposed
`over the lower end of center mandrel 44, and Sealing
`engagement is provided therebetween by a Sealing means,
`Such as a pair of O-ringS 52.
`Also as seen in FIG. 1D, a quick-connect collar 54 is
`attached to tool connector 50 at threaded connection 56.
`Collar 54 is of a kind known in the art and it will be seen that
`it connects tool connector 50 to center mandrel 44 by
`clamping against an outwardly extending flange 58 on the
`center mandrel.
`Referring again to FIG. 1A, top adapter 20 has an internal
`thread 60 adapted for connection to a length of coiled tubing
`62 of a kind known in the art. A logging cable 64 is run
`through the length of coiled tubing 62 and into the upper
`portion of upper housing 16.
`Disposed in collar 22 between top adapter 20 and piston
`Sub 26 is a body 66 which generally defines a first longitu
`dinal passageway 68 and a Second longitudinal passageway
`70 which is substantially parallel to the first passageway.
`Disposed in an enlarged portion of first longitudinal pas
`Sageway 68 are a pair of check valves 72. A Sealing means,
`Such as an O-ring 74, provides Sealing engagement between
`each check valve 72 and body 66. Check valves 72 are of a
`kind known in the art Such as ball-type or flapper-type check
`valves and allow fluid flow downwardly through first lon
`gitudinal passageway 68 while preventing upward fluid flow
`therethrough. Two such check valves 72 are used for redun
`dancy in the event of failure of one of them. Such redun
`dancy is required in Some well operations, Such as offshore
`operations in the North Sea.
`The lower end of logging cable 64 extends into Second
`longitudinal passageway 70 in body 66, and the logging
`cable is attached to the body by a cable clamp 76. Cable
`clamp 76 is of a kind known in the art and clampingly
`engages the outside of logging cable 64. Cable clamp 76 is
`attached to body 66 at threaded connection 78.
`Abulkhead 80 is disposed in an enlarged lower portion of
`Second longitudinal passageway 70, and as Seen in FIGS. 1A
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`S
`and 1B, a Sealing means, Such as a pair of O-ringS 82,
`provides Sealing engagement between bulkhead 80 and body
`66. Bulkhead 80 is adjacent to the top of piston Sub 26.
`Upper and lower halves 84 and 86 of an electrical
`feed-through 88, of a kind known in the art, are attached to
`bulkhead 80 and extend therefrom on opposite upper and
`lower sides, respectively, of the bulkhead. A wire 90 extends
`down from logging cable 64 and terminates at electrical
`feed-through 88. Another wire 91 extends downwardly from
`electrical feed-through 88. Feed-through 88 provides an
`electrical connection between wires 90 and 91.
`Still referring to FIG. 1B, piston Sub 26 defines a first
`longitudinal passageway 92 therein which is generally
`aligned and in communication with first longitudinal pas
`sageway 68 in body 66. Piston Sub 26 also defines a second
`longitudinal passageway 94 therethrough which is Substan
`tially parallel to first longitudinal passageway 92 and is
`Substantially aligned with Second longitudinal passageway
`70 in body 66. It will be seen that lower half 86 of electrical
`feed-through 88 extends into Second longitudinal passage
`way 94 in piston Sub 26.
`Below first longitudinal passageway 92 and Second lon
`gitudinal passageway 94, upper housing 16 defines a cen
`trally located, longitudinally extending piston cavity 96
`therein which is in communication with first longitudinal
`passageway 92 and Second longitudinal passageway 94 in
`piston Sub 26. Piston cavity 96 is formed by a first bore 98
`in the lower end of piston Sub 26, a second bore 100 in
`ported Sub 32, a third bore 102 in the ported Sub and a fourth
`bore 104 in lug window Sub 36, as seen in FIGS. 1B and 1C.
`First bore 98 is the largest, second bore 100 is somewhat
`Smaller than first bore 98, and third bore 102 is Smaller than
`second bore 100. Fourth bore 104 is substantially the same
`size as third bore 102. An upwardly facing shoulder 106 in
`ported Sub 32 extends between first bore 98 and second bore
`100, and an angled ramp or chamfer 108 in the ported Sub
`extends between second bore 100 and third bore 102.
`Actuating piston 14 is disposed in piston cavity 98 and is
`movable longitudinally therein. Still referring to FIGS. 1B
`and 1C, piston 14 comprises an upper piston 110 and a lug
`prop 112 attached to the upper piston at threaded connection
`114.
`Referring to FIG. 1B, piston 14 has a first outside diam
`eter 116 and a smaller second outside diameter 118 on upper
`piston 110. An annular, downwardly facing shoulder 120
`extends between first outside diameter 116 and second
`outside diameter 118. A first seal 122 disposed in first
`outside diameter 116 provides Sealing engagement between
`piston 14 and first bore 98. Below first seal 122, a second
`Seal 124 is carried on piston 14 in Second outside diameter
`118, and a third seal 126 is carried on piston 14 in second
`outside diameter 118 below second seal 124. Third seal 126
`provides Sealing engagement between piston 14 and third
`bore 102. The operation of second seal 124 will be further
`described herein.
`Below third seal 126, upper piston 110 of piston 14 forms
`an annular receSS 128 which may also be referred to as a lug
`saddle 128. Lug saddle 128 will thus be seen to be generally
`annular with chamfers 129 at the upper and lower ends
`thereof.
`Piston 14 also has a third outside diameter 130 on lug prop
`112. Third outside diameter 130 on lug prop 112 is substan
`tially the Same size as Second outside diameter 118 on upper
`piston 110. Below third outside diameter 130, piston 14 has
`a fourth outside diameter 132 on lug prop 112. A down
`wardly facing shoulder 133 extends between third outside
`diameter 130 and fourth outside diameter 132.
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`US 6,196,325 B1
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`Upper piston 110 of piston 14 defines a bore 134 therein
`with a large upwardly facing chamfer 136 at the upper end
`thereof. Chamfer 136 insures that bore 134 is in communi
`cation with first longitudinal passageway 92 and Second
`longitudinal passageway 94 in piston Sub 26 of upper
`housing 16.
`A plurality of replaceable and interchangeable nozzles
`138 are disposed in corresponding piston flow ports 139 and
`are attached by threaded connections 140. Each nozzle 138
`has a nozzle port or orifice 142 defined therein which
`extends transversely with respect to piston 14 and will be
`Seen to be in communication with bore 134 in upper piston
`110. The size of nozzle ports 142 may be varied so that the
`flow through nozzles 138 may be changed as desired. The
`use of nozzles 138 and the selection of nozzle ports 142 will
`be more fully described herein.
`Below nozzles 138, upper piston 110 defines a trans
`versely extending equalizing port 144 therein which pro
`vides communication between bore 134 and the outside of
`piston 14 below third seal 126. Thus, it will be seen that
`preSSure above and below piston 14 is Substantially equal
`ized.
`Upper piston 110 also defines a longitudinally extending
`hole 146 which is spaced off center from bore 134 and
`extends the length of the upper piston. Hole 146 does not
`interSect any of piston ports 139 and is not in communication
`with them. Hole 146 is in communication with a bore 148
`and a hole 150 both defined in lug prop 112. Referring again
`to FIGS. 1B and 1C, wire 90 extends down from lower half
`86 of electrical feed-through 88 and through second longi
`tudinal passageway 94 in piston Sub 26, hole 146 in upper
`piston 110, bore 148 and hole 150 in lug prop 112 and thus
`downwardly into lower housing 18.
`Referring again to FIG. 1B, ported Sub 32 of upper
`housing 16 defines a plurality of housing flow ports 152
`transversely therethrough. Flow ports 152 will be seen to be
`in communication with nozzles 138 through an annulus 154
`defined between second bore 100 in ported Sub 32 and
`second outside diameter 118 on upper piston 110.
`Above flow ports 152, ported Sub 32 also defines a
`plurality of transversely extending vent ports 156 therein.
`Vent ports 156 are substantially longitudinally aligned with
`a similar set of vent ports 158 defined in piston Sub 26.
`Communication is provided between vent ports 156 and 158
`through an annulus 160 defined between piston Sub 26 and
`ported Sub 32 below threaded connection 34 and above
`shoulder 106. Vent ports 156 and 158 will also be seen to be
`in communication with an annulus 162 defined between first
`bore 98 in piston Sub 26 and second outside diameter 118 on
`upper piston 110 below shoulder 120.
`Referring again to FIG. 1C, upper housing 16 and lower
`housing 18 of outer housing 12 are connected together by a
`first, housing shearing means, Such as a plurality of Shear
`pins 164. Each shear pin 164 is disposed through a hole 166
`extending transversely in lug housing 42, and the shear pins
`extend into a corresponding plurality of radially oriented
`holes 168 defined in the lower end of lug window Sub 36. A
`Sealing means, Such as an O-ring 170, provides Sealing
`engagement between lug window Sub 36 and lug housing 32
`and thus between upper housing 16 and lower housing 18.
`Below shear pins 164 and O-ring 170, lug housing 42
`defines an annular lug recess 172 having a chamfer 174 at
`the upper end thereof. Lug window Sub 36 defines a plurality
`of radially extending lug windows 176 therein which gen
`erally face lug recess 172 in lug housing 42. A lug 178 is
`disposed in each of lug windows 176. Each lug 178 has a
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`US 6,196,325 B1
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`7
`locked position in which an inner Surface 180 engages third
`outside diameter 130 on lug prop 112 of piston 14 when the
`piston is in the running position thereof shown in FIGS.
`1B-1C.. Each lug 178 also has an outer surface 182 which
`extends into lug receSS 172 in lug housing 42 when the lugs
`are in the locked position. Further, each lug. 79 has an
`outwardly and upwardly facing chamfer 184 thereon which
`generally faces chamfer 174 in lug recess 172. As will be
`further described, lugs provide a locking means for prevent
`ing relative longitudinal movement of upper and lower
`housings 16 and 18, thereby preventing premature shearing
`of shear pins 164.
`The lower end of lug window Sub 36 is attached to a
`spring rest collar 186 at threaded connection 188. Both the
`lower end of lug window Sub 36 and spring rest collar 186
`extend into a bore 190 defined in lug housing 42. Spring rest
`collar 186 defines a bore 192 therein which is substantially
`the same size as fourth bore 104 defined in lug window Sub
`36. At the lower end of bore 192 is an inwardly extending
`shoulder 194.
`Aspring rest 196 is disposed in the upper end of bore 192
`in spring rest collar 186. Spring rest 196 is attached to spring
`rest collar 186 by a Second, Spring rest shearing means, Such
`as a plurality of shear pins 198. Each shear pin 198 is
`positioned in a hole 200 defined transversely in spring rest
`collar 186, and the Shear pins extend into an annular groove
`202 in the outside of spring rest 196.
`A biasing means, Such as a compression Spring 204, is
`disposed between an upper end 206 of spring rest 196 and
`shoulder 133 on lug prop 112 of piston 14. It will thus be
`Seen that piston 14 is biased upwardly to the running
`position shown in FIGS. 1B and 1C.
`Wire 91 extends downwardly through a hole 208 in the
`center of spring rest 196 and another hole 210 in the lower
`end of spring rest collar 186 so that the wire terminates at an
`electric feed-through 212 positioned in center mandrel 44 of
`lower housing 18. Electric feed-through 212 is in electrical
`communication with a Spring contact 214 which in turn is in
`electrical contact with a wireline tool connector 216. Cable
`head 10 is used to run a known wireline tool 218, Such as a
`logging tool and/or Set of perforating guns. Wireline tool 218
`is attached to a logging tool/gun connection in the form of
`threaded surface 220 on tool connector 50 of lower housing
`18. This connection is, both mechanically and electrically, of
`a kind known in the art in which the tool string itself is the
`ground.
`
`Operation of the Invention
`Referring still to FIGS. 1A-1D, cablehead 10 is attached
`at threaded surface 60 in top adapter 20 to a coiled tubing
`connector So that the cablehead is at the end of a String of
`coiled tubing 62. Piston 14 is in the running position and
`lugs 178 are in their locked position. Wireline tool 218 is
`attached to threaded Surface 220 at the bottom of tool
`connector 50. As mentioned above, this wireline tool may be
`one of any number of known tools, Such as a logging tool
`and/or a Set of perforating guns. The entire tool String is run
`into a well in a manner known in the art. If wireline tool 218
`includes a logging tool, the logging operation may be carried
`out in a known manner. If wireline tool 218 includes
`perforating guns, the guns may be positioned and triggered
`to carry out the desired perforating operation. In perforating,
`Shock loading may be transmitted upwardly into cablehead
`10 as previously discussed herein. All Such shock loading
`will be absorbed by the locked interconnection of upper
`housing 16 and lower housing 18 b