METHOD AND SYSTEM TO AVOID PREMATURE ACTIVATION OF LINER HANGER

摘要

A technique facilitates avoidance of premature actuation of a liner hanger in a wellbore. The technique utilizes a running string which may be coupled to a liner having a liner hanger. The running string extends into the liner in a manner which creates an inner pressure region within the running string, an intermediate pressure region between the running string and the liner, and an outer or annulus pressure region surrounding the liner. The inner pressure region is initially isolated from the intermediate pressure region by a closure mechanism during, for example, movement downhole. The closure mechanism selectively closes off a port used to actuate the liner hanger.

主权项

1. A system for avoiding premature actuation in a wellbore, comprising:
a liner having a liner hanger; and a running string coupled to the liner and extending into the liner in a manner which creates an inner pressure region within the running string, an intermediate pressure region between the running string and the liner, and an annulus pressure region surrounding the liner, the intermediate pressure region and the annulus pressure region being pressure balanced during movement downhole into the wellbore if pressure in the annulus pressure region exceeds pressure in the intermediate pressure region, the inner pressure region being selectively isolated from the intermediate pressure region by a closure mechanism closing a port until desired actuation of the liner hanger.