BOP tools challenged by higher risks
Journal Article
·
· Offshore; (United States)
OSTI ID:6777186
Blowout prevention tools and techniques of today are geared for easy maintenance, installation, and operation. Gaining control over blowouts involves blocking the escaping flow either in the formation or the well bore. Diver activated killing techniques are feasible, but cannot be used in every situation. The initial designs of the typical annular or ram-type blowout preventers have undergone only slight changes since their inception. Principal differences lie in new and revised operating mechanisms for these units. The annular BOP is the most employed unit by the drilling industry. Two designs now available - stripper-type units and metal reinforced packing unit preventers - incorporate closing-off and controlling qualities for offshore emergencies. Created specifically for underwater operations, ram-type BOPs come in various shapes, sizes and pressure ratings. Steps have been taken to revamp the efficiencies of the blowout prevention stack design. A single or double riser size with corresponding BOP stacks can also carry out offshore operations. The only differences involve riser and casing measurements. BOP control systemsmonitor and control the behavior of a deepwater BOP from the drilling platform. Subsea pilot operated control valves were later installed on the BOP stacks designed to vent to sea the discharging fluid from a ram or stack component when actuated. The valves were installed in a retrievable connector called a pod. There are three basic layouts in component designs. The most popular basic design is the Electric Driller's Panel where pilot valve control is located in a safe, remotely-controlled area from the driller's position on the rig floor. (DP)
- OSTI ID:
- 6777186
- Journal Information:
- Offshore; (United States), Journal Name: Offshore; (United States) Vol. 39:14; ISSN OFSHA
- Country of Publication:
- United States
- Language:
- English
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