초록 ▼

A tubular extraction system for use in a plug and abandonment process and may include a structural mounting for adaptation to a well head, various mountings may be used to provide a structure for attaching actuators for griping the tubular string, indenting or crimping the tubular and shearing the t

A tubular extraction system for use in a plug and abandonment process and may include a structural mounting for adaptation to a well head, various mountings may be used to provide a structure for attaching actuators for griping the tubular string, indenting or crimping the tubular and shearing the tubular string. The system further use a fork supported on a lifting apparatus such as a top drive unit, draw works or portable crane, the fork is inserted within the mounting structure of the system to engage the crimped or indented portion of the tubular section being extracted and thus allow removal of sequentially sheared sections of the tubular string.

대표청구항 ▼

What is claimed is: 1. A tubular extraction system comprising: a) a mounting; b) a plurality of opposing actuators attached to said mounting; c) a plurality of gripping, indenting and shearing assemblies attached to said actuators; and d) a means for engaging and lifting a string of tubular members

What is claimed is: 1. A tubular extraction system comprising: a) a mounting; b) a plurality of opposing actuators attached to said mounting; c) a plurality of gripping, indenting and shearing assemblies attached to said actuators; and d) a means for engaging and lifting a string of tubular members insertable within mounting cooperative with indentations made by said indenting assemblies. 2. The tubular extraction system according to claim 1 wherein said mounting is located above a tubular string to be extracted. 3. The tubular extraction system according to claim 2 wherein said indenting assembly comprises a first and second opposing actuators having a tubular hub having a mounting flange portion and a central longitudinal through bore having internal threads at one end and a keyway, a cylindrical connector having a “C” shaped channel at each end slidable within said bore, a cylindrical head member having an external threads at each end and a central shoulder and a central through bore, threadably attached to said tubular hub, a connecting rod having a mushroom head at one end cooperative with said “C” shaped channel connected to said connector said rod slidable within said cylinder head member, an elongated tubular sleeve having internal threads at each end and external threaded fluid ports threadably connected at one end to said cylinder head member, a piston member having internal threads at one end and a central shoulder portion having a seal means said piston threadably connected to said connecting pin and slidable within said sleeve, an elongated cylindrical butt member externally threaded at one end threadably connected to said sleeve, each said actuator connected to a cylindrical die member slidable within said tubular hub having a stem portion and a mushroom shaped head portion at one end, an upper keyway, a lower tie-bar notch and tie bar, and a face opposite the stem portion having a vertical bore using said face as center for an upper and lower radii equal to one-half of the tubular outside diameter to be engaged by the die and a smaller radii located intermediate the upper and lower radii by said mushroom head slidably located within said “C” shaped channel and retained thereto by a connecting key. 4. The tubular extraction system according to claim 1 further comprising a wellhead attachment having a flanged adaptor spool, an adaptor member having a central opening and slots for adjustable attachment to said spool and said mounting. 5. The tubular extraction system according to claim 1 wherein said indenting assembly is located intermediate said gripping assembly and said shearing assembly. 6. The tubular extraction system according to claim 5 wherein said shearing assembly comprises a first and second opposing actuators having a tubular hub, a mounting flange portion and a central longitudinal through bore having an internal threads at one end and a keyway, a cylindrical connector having a “C” shaped channel at each end slidable within said bore, a cylindrical head member having an external threads at each end and a central shoulder and a central through bore, threadably attached to said tubular hub, a connecting rod having a mushroom head at one end cooperative with said “C” shaped channel connected to said connector said rod slidable within said cylinder head member, an elongated tubular sleeve having internal threads at each end and external threaded fluid ports threadably connected at one end to said cylinder head member, a piston member having internal threads at one end and a central shoulder portion having a seal means said piston threadably connected to said connecting pin and slidable within said sleeve, an elongated cylindrical butt member externally threaded at one end threadably connected to said sleeve, a cylindrical die member slidable within said tubular hub having a stem portion and a mushroom shaped head portion at one end, an upper keyway, a lower tie-bar notch and a shearing blade portion located opposite the stem portion having a horizontal face extending the width of the die diameter and a vertical face containing an orientation notch said shearing blade having a beveled “V” shape at a leading edge at least equivalent to the largest outside diameter of tubular to be engaged by the die member, said die member attached to said connector by said mushroom head slidably located within said “C” shaped channel and retained thereto by a connecting key. 7. The tubular extraction system according to claim 1 wherein means for lifting is a fork cooperative with indentations in an external surface of said tubular string member. 8. The tubular extraction system according to claim 7 wherein said fork comprises a bail attached thereto, the fork being slidable within said mounting for engagement with an indented portion of said tubular created by said indenting dies. 9. The tubular extraction system according to claim 8 wherein said fork comprises an elongated plate having an elongated slot extending from one end of said plate along a longitudinal center line to a radii equivalent to one-half the diameter of the tubular to be lifted using a balance point of said plate as center and a “V” shaped arm for said bail pivotally connected to said plate at said balance point. 10. The tubular extraction system according to claim 9 wherein said fork further comprises a pivotal safety bar extending across said slot. 11. The tubular extraction system according to claim 9 said lifting means further comprises a winch and cable system attachable to said fork for lifting said tubular members. 12. The tubular extraction system according to claim 1 wherein gripping assembly comprises: a) a first actuator assembly comprising: i) a tubular hub having a mounting flange portion and a central longitudinal through bore having an internal threads at one end and a keyway; ii) a cylindrical connector having a “C” shaped channel at each end slidable within said bore; iii) a cylindrical head member having an external threads at each end and a central shoulder and a central through bore threadably attached to said tubular hub; iv) a connecting rod having a mushroom head at one end cooperative with “C” shaped channel connected to said connector said rod slidable within said cylinder head member; v) an elongated tubular sleeve having internal threads at each end and external threaded fluid ports threadably connected at one end to said cylinder head member; vi) a piston member having internal threads at each end and a central shoulder portion having a seal means said piston threadably connected to said connecting pin and slidable within said sleeve; vii) an elongated cylindrical butt member externally threaded at one end and having a central longitudinal bore having internal seals at one end and threads at the opposite end said butt member threadably connected to said sleeve; viii) a stop rod threadably attached to one end of said piston slidable within said butt member; ix) a tee handle having a rod portion having external threads and a internal socket at one end and a transverse bar at the opposite end said rod portion threadably connected internally to said butt member with said socket engaging said stop rod; x) a cylindrical gripping die member slidable within said tubular hub having a mushroom head at one end and “V” shaped jaws having teeth at the opposite end said jaws separated by a central channel said die member attached to said connector by said mushroom head slidably located within said “C” shaped channel and retained thereto by a connecting key; and b) a second opposing actuator assembly comprising elements i)-ix) and a cylindrical gripping die member slidable within said tubular hub having a mushroom head at one end and a single “V” shaped jaw having teeth at the opposite end said jaw cooperative with said channel located between said “V” shaped jaws of said element x) said die member attached to said connector by said mushroom head slidable located within said “C” shaped channel and retained thereto by a connecting key. 13. The tubular extraction system according to claim 1 further comprises a fluid pump and valve assembly for activating said actuators. 14. A method for extracting tubular members from a well in a plug and abandonment process comprising the steps of: a) locating a mounting adjacent a tubular string to be extracted, said mounting comprising a plurality of opposing actuators attached to said mounting, a plurality of gripping, indenting and shearing assemblies attached to said actuators; and, a means for lifting a string of tubular members cooperative with indentions within a surface of said tubular members; b) attaching a lifting apparatus to a tubular string and passing a portion of said tubular string between said opposing actuators to a point above said mounting; c) engaging said tubular string by activating a set of said opposing actuators having attached gripping dies thereby retaining said tubular string in a suspended manner; d) engaging said tubular string by activating a set of opposing actuators having attached shearing dies thereby severing a portion said tubular string below said engagement means; e) engaging said tubular string by activating a set of opposing actuators having indenting dies attached located between said shearing dies and said gripping dies thereby forming an indentation within the surface of said tubular; f) re-engaging said tubular string with said lifting apparatus thereby providing support for said tubular string; g) disengaging said actuators having opposing gripping dies; h) activating said lifting apparatus and lifting said tubing string to a desired height above said wellhead structure; i) repeating steps c)-e); and j) laying down a portion of said tubing string supported by said lifting apparatus and repeating step f) and repeating steps c)-h) until said tubular string is extracted. 15. The method according to claim 14 further comprising the step of securing a safety bar on said lifting apparatus to prevent accidental disengagement. 16. The method according to claim 14 further comprising the step of blocking retraction of said actuators having opposing gripping assemblies by manually rotating a stop screw handle. 17. The tubular extraction system comprising: a) a first mounting structure; b) a first tubular gripping actuator attached to said first mounting structure; c) a first tubular shearing actuator attached to said first mounting structure; d) a first tubular indenting actuator attached to said first mounting structure; e) a second mounting structure, said second mounting structure being spaced apart and connected to said first mounting structure; f) a second tubular gripping actuator attached to said second mounting structure; g) a second tubular shearing actuator attached to said second mounting structure; and h) a second tubular indenting actuator attached to said second mounting structure. 18. The tubular extraction system according to claim 17 wherein said first tubular indenting actuator is located between said first tubular gripping actuator and said first tubular shearing actuator, and said second tubular indenting actuator is located between said second tubular gripping actuator and said second tubular shearing actuator. 19. The tubular extraction system according to claim 18 wherein said first and second tubular indenting actuators further comprise interchangeable indenting dies located at an end of said first and second tubular indenting actuators. 20. The tubular extraction system according to claim 19 wherein said first and said second tubular shearing actuators further comprise interchangeable shearing dies located at an end of said first and second tubular shearing actuators. 21. The tubular extraction system according to claim 20 wherein said first and said second tubular gripping actuators further comprise interchangeable gripping dies located at an end of said first and second tubular indenting actuators. 22. The tubular extraction system according to claim 21 further comprising: a) a means for cooperating with indentions in a tubular; and b) a lifting apparatus connected to said means for cooperating with indentions in a tubular. 23. A method for extracting a tubular string from a well comprising the steps of: a) gripping the tubular; b) indenting the tubular, whereby indentions are formed in the tubular; c) shearing the tubular; d) attaching a means for cooperating with the indentions in the tubular to the indentions in the tubular; e) ungripping the tubular; and f) lifting the tubular. 24. The method of extracting a tubular string from a well according to claim 23 further comprising the additional steps of: a) laying down a portion of the tubular string; b) detaching said means for cooperating with the indentions in a tubular; and c) repeating steps a-f of claim 23, and steps a-b of claim 24, until the tubular string is extracted from the well.