Blowout preventer ram automatic locking system
US5918851A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 3, 1998 |
| Grant date | Jul 6, 1999 |
| Priority date | — |
| Expiry date | Mar 3, 2018 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/062
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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 sp…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.