公开(公告)号：CA2871925C

公开(公告)日：2016-12-06

申请号：CA2871925

申请日：2014-11-20

Applicant: WEATHERFORD/LAMB INC

Inventor： KING KYLE ALLEN ,  NOSKE JOE ,  MCDOWELL CHRISTOPHER L ,  MICKENS BRIAN A

IPC: E21B47/06 ,  E21B33/124 ,  E21B34/06

Abstract: A differential pressure indicator (DPI) for use with a downhole isolation valve includes a tubular mandrel for assembly as part of a casing string and for receiving a tubular string. The mandrel has a stop shoulder and a piston shoulder. The DPI further includes a tubular housing for assembly as part of the casing string and for receiving the tubular string. The housing is movable relative to the mandrel between an extended position and a retracted position and has a stop shoulder and a piston shoulder. The DPI further includes a hydraulic chamber formed between the piston shoulders and a coupling in communication with the hydraulic chamber and for connection to a sensing line. The housing is movable relative to the mandrel and to the extended position in response to tension exerted on the DPI.