Downhole Separation Apparatus and Method

摘要

A downhole separation apparatus for releasing a pipe string from a bottom hole assembly is disclosed. The apparatus has a tubular collet body, a tubular bottom sub, and a piston collet positioned within the collet body. The collet piston has a plurality of collet fingers threadedly engaging an internal profile of the bottom sub. Separation is accomplished by pumping a circulation ball through the pipe string until it lands on a ball seat inside the collet piston. Increasing fluid pressure then shifts the piston collet axially downward within the collet body thereby causing the collet fingers to collapse to disengage the bottom hole assembly from the pipe string.

主权项

1. A downhole separation apparatus comprising:
(a) a tubular collet body haying an internal abutment surface; (b) a tubular bottom sub having an internal profile corresponding to the external profile of said collet body; (c) a tubular piston collet positioned within said collet body, said piston collet haying a shoulder releaseably engaged with said internal abutment surface of said collet body; and (d) a plurality of collet fingers on said collet body releaseably engaged with an internal profile of said bottom sub.