Multi-cycle releasable connection
AssigneeSchlumberger Technology Corporation
InventorsLarry J. Leising, Howard L. McGill
Life of this patent
Estimating the term…
Abstract
A releasable connection between the lower end of a running string and a well tool that is subject to being stuck in a well includes inner and outer members movable telescopically between contracted and extended positions, a tension sleeve connecting the members in the contracted position and being disrupted by a predetermined pull to allow telescoping movement, a stop nut to limit such movement in the extended position of the members, and a mechanism responsive to a certain number of cycles of telescoping movement for disabling the stop nut to allow complete release and separation of the members.
Claims17
Apparatus for use in releasably connecting a running string to a well tool in a manner such that the running string can be retrieved from a well in case the well tool becomes stuck therein comprising:
- a pair of tubular telescoping members, one of said members being attached to the running string and the other of said members being attached to the well tool;
- releasable means preventing telescoping movement of said members until a predetermined level of force is applied to said one member;
- limiting means for limiting the extent of said telescoping movement after release of said releasable means by application of said force;
- and disabling means responsive to a plurality of cycles of up and down telescoping movements of said running string for disabling said limiting means and thereby allowing separation of said members.
Apparatus for use in releasably connecting a running string to a well tool in a manner such that the running string can be retrieved from a well in case the well tool becomes stuck therein, comprising:
- an outer tubular member adapted to be attached to the well tool;
- an inner tubular member telescopically disposed in said outer member for movement between retracted and extended positions;
- releasable means for holding said members in said retracted position unless a predetermined level of axial load is applied to said inner member by the running string;
- stop means operable upon release of said releasable holding means for limiting extension of said inner member relative to said outer member;
- and disabling means responsive to a plurality of cycles of up and down telescoping movements of said inner member within said outer member for disabling said stop means so that said inner member can be withdrawn from said outer member and separated therefrom.
Dependencies are inferred from the claim text.