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1. (WO2017032989) PRESSURE OPERATED APPARATUS AND METHOD

Pub. No.:    WO/2017/032989    International Application No.:    PCT/GB2016/052584
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Sat Aug 20 01:59:59 CEST 2016
IPC: E21B 34/10
Applicants: WEATHERFORD U.K. LIMITED
Inventors: REID, Stephen
JAFFREY, Ian
Title: PRESSURE OPERATED APPARATUS AND METHOD
Abstract:
A downhole pressure operated apparatus comprises a piston member mounted within a piston bore and being reconfigurable from a lock configuration to an unlock configuration in response to a pressure sequence applied within the piston bore, wherein the piston member comprises a lock profile. A lock member is arranged in a cavity which opens into the piston bore, wherein when the piston member is in its lock configuration the lock member is supported by the piston member such that the lock member partially extends into the piston bore and engages the lock profile of the piston member to restrict movement of the piston member in a first direction towards its unlock configuration. In response to a first pressure event of the pressure sequence the piston member is moveable in a second direction to desupport the lock member and permit said lock member to be wholly received into the piston bore and allow the piston member to move in the second direction towards its unlock configuration in response to a subsequent second pressure event of the pressure sequence.