Patent ID: 6230806
Filing Date: 2001-05-15
Classification: E21B

Abstract:
A temporary no-go assembly for use in locating a downhole tool at a predetermined target depth in a casing, the casing having a no-go shoulder, the assembly comprising:a key for interfacing with the no-go shoulder;a key retractor for retracting the key from the no-go shoulder;a mandrel, a first portion of the mandrel having an external surface;an inner mandrel disposed within the mandrel, the inner mandrel having a first end with a first cross-sectional area and a second end with a second cross-sectional area smaller than the first cross-sectional area,the key retractor being coupled to the inner mandrel, and the key being disposed in the mandrel;a plurality of the key retractors spaced around the circumference of the external surface and coupled to the inner mandrel; anda plurality of the keys disposed in the mandrel for cooperating with the key retractors.