Valves and valve actuation – Blow-out preventers – Radial reciprocating ram
Patent
1998-03-03
1999-07-06
Fox, John
Valves and valve actuation
Blow-out preventers
Radial reciprocating ram
251 11, E21B 3306
Patent
active
059188510
ABSTRACT:
A blowout preventer ram automatic locking apparatus for use in a ram-type blowout preventer used in oil and gas drilling operations is disclosed. The blowout preventer has a body with an axial bore, a pair of opposing bonnet assemblies and a pair of opposing rams laterally moveable within the bonnet assemblies by a pressurized fluid source to control flow of well fluids through the blowout preventer body axial bore. The blowout preventer ram automatic locking apparatus includes a bonnet header sealingly connected to the side of the blowout preventer body with an operating cylinder sealingly connected to the bonnet header. An operating piston is connected to the ram and moves axially within the operating cylinder in response to pressurized fluid supplied through porting in the bonnet header and end cap. A plurality of locking pistons are circumferentially spaced about the operating piston in locking piston chambers and are axially moveable in response to fluid pressure. The locking pistons include an axially tapered cylindrically shaped surface on one end. A bonnet cap is sealingly connected to the operating cylinder and bonnet header and includes a plurality of circumferentially spaced axially tapered cylindrically shaped surfaces. An end cap sealingly engages the bonnet cap. The locking piston chambers each include a radially disposed window that receives a locking segment in radially sliding engagement. The locking segments have acutely angled interior and exterior axially tapered cylindrically shaped faces to cooperate with the locking pistons and bonnet cap acutely angled axially tapered cylindrically shaped surfaces. The locking segments are moved radially in response to fluid pressure applied to the locking pistons. Movement of the locking segments radially outward to a locked position maintains the operating piston and ram in a closed position.
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Cooper Cameron Corporation
Duke Jackie Lee
Fox John
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