Actuator for wireline blowout preventer

Patent · Tue Jul 29 04:00:00 EDT 1980

OSTI ID:6845046

Hardgrave, W

In a wireline blowout preventor connectable to a well head having a housing with a vertical flow path for the flow of well fluids under pressure and rams movable transversely in said housing to open and close said vertical flow path, the improvement consists of actuators for actuating movement of said rams. Each actuator comprises an actuator having, connectable to said wireline blowout preventor housing, having a longitudinal bore transverse to said vertical flow path, piston means disposed in said longitudinal bore, a portion of said longitudinal bore forming a first variable capacity pressure chamber for receiving a pressure fluid from a source outside said actuator housing wherin an increase in pressure therin causes said piston means to move said respective ram to open said vertical flow path, port means to provide fluid communication between the exterior of said actuator housing and said first variable capacity pressure chamber, a portion of said longitudinal bore forming a second variable capacity pressure chamber for receiving pressure from said well, connector means connecting said piston and said ram, having a bore passageway extending therethrough in communication with a bore passageway extending through said piston, providing fluid communication between said second variable capacity pressure chamber and said vertical flow path, whereby a pressure in said well exceeding the pressure in said first variable capacity pressure chamber causes said pistons to move said rams to a position closing said vertical flow path.

• Assignee: Otis Engineering Corp
• Patent Number(s): US 4214605
• OSTI ID: 6845046
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ACTUATORS
BLOWOUT PREVENTERS
BOREHOLES
CAVITIES
EQUIPMENT
FLUID FLOW
HYDRAULIC EQUIPMENT
PISTONS
PRESSURE DEPENDENCE
RESERVOIR PRESSURE
WELL PRESSURE
WELLHEADS
WELLS