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1. (WO2015047235) MULTIPLE PISTON PRESSURE INTENSIFIER FOR A SAFETY VALVE

Pub. No.:    WO/2015/047235    International Application No.:    PCT/US2013/061546
Publication Date: Fri Apr 03 01:59:59 CEST 2015 International Filing Date: Thu Sep 26 01:59:59 CEST 2013
IPC: E21B 34/06
E21B 34/12
Applicants: HALLIBURTON ENERGY SERVICES, INC.
Inventors: SCOTT, Bruce, Edward
Title: MULTIPLE PISTON PRESSURE INTENSIFIER FOR A SAFETY VALVE
Abstract:
Disclosed are subsurface safety valves having multiple pistons used to increase the opening force. One safety valve includes a housing having a piston bore defined therein and configured to receive hydraulic fluid pressure, the piston bore providing an upper bore having a first diameter and a lower bore having a second diameter smaller than the first diameter, a piston assembly movably arranged within the piston bore and comprising an upper piston arranged in and configured to sealingly engage the upper bore and a lower piston arranged in and configured to sealingly engage the lower bore, and a connecting rod coupling the upper and lower pistons, wherein a cavity is defined between the upper and lower pistons within the piston bore and the piston rod extends within the cavity.