SAFETY JOINT FOR A TOOL STRING

摘要

A safety joint includes two tubular joint bodies. A plurality of circumferentially spaced first holes is formed in one tubular joint body and at least a second hole is formed in the other tubular joint body. The tubular joint bodies each have threaded sections. The threaded sections and holes are configured such that the at least one second hole is aligned with one of the first holes when a threaded connection is formed between the threaded sections. A shear pin is inserted into the aligned holes. Instead of providing the circumferentially spaced first holes in one of the tubular joint bodies, the circumferentially spaced first holes may be provided in a torque ring that is coupled to one of the tubular joint bodies by a threaded connection. The hole alignment could then be between the tubular joint body having the second hole and the torque ring.

主权项

1. A safety joint comprising:
an upper joint having a first threaded surface and a first cylindrical section, wherein the first cylindrical section includes an first hole set having one or more first holes arranged about a circumference of the first cylindrical section; a lower joint having a second threaded surface and a second cylindrical section, wherein the first threaded surface is engaged with the second threaded surface, and wherein the second cylindrical section includes a second hole set having one or more second holes arranged about a circumference of the second cylindrical section; and a shear pin engaged with one of the first holes and one of the second holes.