초록 ▼

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 d

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.

대표청구항 ▼

[ What is claimed is:] [1.] 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 attach

[ What is claimed is:] [1.] 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.