公开(公告)号：US20170234091A1

公开(公告)日：2017-08-17

申请号：US15041548

申请日：2016-02-11

Applicant: BAKER HUGHES INCORPORATED

Inventor： Stephen H. Bisset ,  Gary L. Anderson ,  David B. Ruddock ,  Robert J. Taylor

IPC: E21B23/04 ,  E21B23/06 ,  E21B33/12 ,  E21B47/14 ,  E21B34/10 ,  E21B34/06 ,  E21B33/134 ,  E21B47/12 ,  E21B34/16 ,  E21B23/01

CPC classification number: E21B34/063 ,  E21B34/10

Abstract: A hydraulically operated downhole tool located at a depth where control line hydrostatic pressure would normally set the tool is temporarily isolated from hydrostatic pressure and changes thereto from well exposure or downhole operations until properly located. A removable barrier is placed in the control line to the tool at a height from the tool that limits the hydrostatic force exposed to the actuation mechanism for the tool. The preferred barrier is a rupture disc that is selectively broken with applied pressure from a remote location, typically the surface above the well. The mounting depth of the barrier can be varied to control the maximum hydrostatic pressure seen by the tool as it is advanced to the intended position.