Retrievable well safety valve with expandable external seals

Patent · Tue Sep 08 04:00:00 EDT 1987

OSTI ID:5836551

Pringle, R E

A retrievable subsurface well safety valve for controlling fluid flow through a well conduit having a polished bore is described comprising: a tubular housing having a fluid control port, a bore and a valve closure member moving between open and closed positions for controlling the fluid flow through the bore, a flow tube telescopically moving in the housing for controlling the movement of the valve closure member, biasing means for moving the flow tube in a direction to close the valve, piston and cylinder assembly means in the housing, external means supported by the housing for sealing in the polished bore of the well conduit, means for holding the first seal means in an expanded position, and additional external seal means on the exterior of the housing on each side of the fluid control port, each additional seal means including a third seal having a first and second end. The first end of the third seal abuts the housing for preventing movement of the first end. A longitudinally movable piston abuts the second end of the third seal.

• Assignee: Camco, Inc., Houston, TX
• Patent Number(s): US 4691776
• OSTI ID: 5836551
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
CONTROL EQUIPMENT
DESIGN
DUCTS
EQUIPMENT
FLOW REGULATORS
FLUID FLOW
MATERIALS HANDLING
NATURAL GAS WELLS
OIL WELLS
OPERATION
PISTONS
POSITIONING
PRESSURE EFFECTS
RELIEF VALVES
SEALS
TUBES
VALVES
WELLS