Reset and pulling tool for manipulating well safety valve

A reset and pulling tool for manipulating a go-devil type well safety valve in a well bore to reopen and latch said safety valve open and to pull said safety valve from said bore, said tool comprising:

• a tool housing and locking dog member having a tubular upper end portion and a birfurcated lower end portion comprising external locking dogs;
• a central core and locking finger member disposed for longitudinal and rotational movement within said housing and locking dog member, said core and locking finger member having a lower end portion defining a locking finger thereon provided with vertical spaced locking edge surfaces and vertical spaced release side surfaces, said release surfaces along said locking finger being between said locking dogs at a first longitudinal and rotational position of said core and locking finger member, said locking edge surfaces being positioned within said bifurcated section of said housing and locking dog member for holding said locking dogs at locked positions at a second longitudinal and rotational position of said core and locking finger member, said release surfaces being between said locking dogs at a third longitudinal and said first rotational position of said core and locking finger member;
• a lateral guide pin secured through said core and locking finger member and having opposite end portions projecting beyond said member;
• means providing oppositely disposed guide slots extending longitudinally and circumferentially along said tubular upper end portion of housing and locking dog member receiving said opposite end portions of said guide pin for rotating said guide pin and said core and locking finger member between said first locking finger release position of rotation and said second locking finger locked position of rotation responsive to longitudinal movement of said core and locking finger member within said housing and locking dog member from a first longitudinal position at which said core and locking finger member is at said first position of rotation to a second longitudinal position at which said core and locking finger member are at said second position of rotation and to a third longitudinal position at which said core and locking finger member is rotated back to said first rotational position;
• a locking collet having a plurality of circumferentially-spaced collet fingers secured at first ends with said housing and locking dog member and disposed around and slidable along said core and locking finger member at opposite second ends;
• first, second, and third annular operating flanges on said core and locking finger member spaced longitudinally along said member for coaction with said second ends of said collet fingers between said housing and locking dog member and said core and locking finger member, said first flange having a stop shoulder engageable with said second ends of said collet fingers for applying a force to said collet for urging said housing and locking dog member into said well safety valve, said second flange having a cam surface facing said first flange and having a stop shoulder facing said third flange for engaging said second ends of said collet fingers for latching said second ends of said fingers between said second and third flanges to hold said core and locking finger member at said second locking position, said third flange having a cam surface facing said stop shoulder on said second flange to permit said core and locking finger member to move within said collet and housing and locking dog member to a third release position;
• a support shoulder defined on said core and locking finger member between said third flange on said member and said guide pin facing said third flange;
• shear pin means through said housing and locking dog member engageable with said support shoulder on said member when said member is latched at said second locking position for releasably holding said member at said second locking position against movement toward said third release position;
• an operating skirt on said housing and locking dog member for engagement with an upper end surface on said well safety valve to support said reset and pulling tool on said valve while engaging said tool with said valve;
• and means for connecting said probe and locking finger member with a tool string for supporting said tool in a well bore while manipulating said tool for resetting and pulling said well safety valve.

A reset and pulling tool for manipulating a go-devil type well safety valve in a well bore to reopen and latch said safety valve open and to pull said safety valve from said bore, said tool comprising:

• a body having a bore therethrough;
• a plurality of circumferentially-spaced flexible locking dogs on said body for engaging a head end of said safety valve when radially expanded;
• a longitudinally-movable control finger member within said body having circumferentially-spaced control fingers intermeshed with said locking dogs, said control fingers having side surfaces engageable with side surfaces of said locking dogs when said control fingers are compressed radially inwardly for expanding said locking dogs, said control finger member being movable relative to said locking dogs for engaging a cam surface in said safety valve to cam said control fingers inwardly for expanding said locking dogs;
• an operating prong disposed within said control fingers and said locking dogs, said prong having a locking portion movable within said locking dogs to lock said dogs in expanded positions when said control fingers are radially contracted within said locking dogs, said prong having a free end extending beyond the ends of said control fingers and said locking dogs for insertion into the bore of said safety valve;
• a prong head supported on said prong for substantially closing the bore of said safety valve as said valve is opened and for supporting end edges of said locking dogs as said dogs are expanded by said control fingers;
• a handling core secured in said body having a head end for connection with a handling string for said tool in a well bore, said handling core having a flanged end within said body engageable with an end of said control finger member for manipulating said control fingers when withdrawing said tool from said safety valve after opening said safety valve;
• and means for releasably securing said core and said body against relative movement during manipulation of said tool, said securing means permitting said tool to operate in a first mode while reopening said safety valve, in a second mode when releasing said tool from said safety valve for retrieval from a well bore, and in a third mode when engaging said safety valve and pulling said valve from a well bore.

A reset and pulling tool for manipulating a go-devil type well safety valve in a well bore to reopen and latch said safety valve open and pull said safety valve from said bore, said tool comprising:

• a body having a bore therethrough;
• a plurality of radially movable flexible locking dogs on said body for coupling into a head end of said safety valve for resetting said valve and for pulling said valve from said bore;
• a longitudinally movable operator member within said body having side surfaces engageable with side surfaces along said locking dogs for holding said dogs at locking positions when said tool is coupled into said safety valve for resetting and for pulling said safety valve;
• means for moving said side surfaces on said operator member laterally to engage said locking dogs responsive to longitudinal movement of said operator member;
• means connected with said operator member for securing said tool in a tool string and for applying longitudinal forces to said tool from said tool string;
• means between said operator member and said body for holding said operator member and said body against relative movement during a first mode of operation of said tool for reopening said safety valve;
• and means for releasing said operator member from said body for movement to a position for operation of said tool in a second mode when releasing said tool from said safety valve for retrieval from a well bore.