Abstract Two parallel tubing strings are suspended in a well and respectively carry at their lower ends a bottom hole assembly and a stinger adapted to be stabbed into a socket in the bottom hole assembly. A hold down ring on the stinger and engageable with the wall of the socket resists withdrawal of the stinger from the socket with a force which is large compared to that required to insert the stinger into the socket. If resistance to further movement is encountered when running the stinger-equipped tubing string in, it can be readily determined whether such resistance is due to insertion of the stinger into its socket, or is due to some other obstruction. In other words, if the pull out force is high compared to the run in force experienced just before termination of tubing string movement, stabbing of the stinger into its socket was achieved, in which case the stinger is reinserted. However, if the pull out force is small, then the termination of tubing string movement was due to some other obstruction.
In a well tubing sytem, or the like, the combination of: a. a first tubing string suspended in a well; b. a bottom hole assembly connected to the lower end of said first tubing string; c. said bottom hole assembly providing an upwardly facing socket having an internal cylindrical wall; d. a second tubing string suspended in the well; e. a stinger connected to the lower end of said second tubing string and having a free end insertable into said socket, said stinger having an external cylindrical wall portion of less diameter than said internal cylindrical wall; f. a circumferentially continuous ring mounted on said stinger for limited axial sliding movement relative thereto and engageable with the wall of said socket said ring diverges internally and converges externally toward said free end of said stinger, said stinger is provided thereon with axially spaced external annular shoulders engageable by said ring to limit axial sliding movement of said ring relative to said stinger, said ring in the assembled position being pressed into the space between said internal cylindrical wall and the external cylindrical wall portion; and g. means embodied in said ring and responsive to axial movement of said ring relative to said stinger, for resisting withdrawal of said stinger from said socket with a force which is large compared to that required to insert said stinger into said socket.
Claim 2
Dependent Claim
229 words
In a well tubing sytem, or the like, the combination of: a. a first tubing string suspended in a well; b. a bottom hole assembly connected to the lower end of said first tubing string; c. said bottom hole assembly providing an upwardly facing socket having an internal cylindrical wall; d. a second tubing string suspended in the well; e. a stinger connected to the lower end of said second tubing string and having a free end insertable into said socket, said stinger having an external cylindrical wall portion of less diameter than said internal cylindrical wall; f. a circumferentially continuous ring mounted on said stinger for limited axial sliding movement relative thereto and engageable with the wall of said socket said ring diverges internally and converges externally toward said free end of said stinger, said stinger is provided thereon with axially spaced external annular shoulders engageable by said ring to limit axial sliding movement of said ring relative to said stinger, said ring in the assembled position being pressed into the space between said internal cylindrical wall and the external cylindrical wall portion; and g. means embodied in said ring and responsive to axial movement of said ring relative to said stinger, for resisting withdrawal of said stinger from said socket with a force which is large compared to that required to insert said stinger into said socket.
Claim 3
Dependent Claim
16 words
A system as set forth in claim 1 wherein said tubing strings are side by side.