Deep-Set Subsurface Safety Valve Actuated by Jet-Pump Differential Pressure

Abstract

Summary Offshore oil and gas production often requires placement of a subsurface safety valve (SSSV) in the tubing string to prevent uncontrolled flow from the well. In many wells, this requirement can preclude maximizing production through the use of high-capacity artificial-lift techniques, such as jet pumping. An innovative approach was developed and field-tested in the McArthur River field, Cook Inlet, AK, to overcome problems associated with incorporating SSSV's in jet-pump completions. This method provides surface control over the valve and does not restrict production rate. In this approach, an SSSSV was placed in the tubing string below a jet pump at 9, 800-ft [3000-m] true vertical depth (TVD) to satisfy safety requirements. The system design allows the SSSV to be controlled from the surface with no dependence on hydraulic control lines to surface. The system was later improved to allow the SSSV to be reverse-circulated from the well for repairs or remedial activities.