Annular Blowout preventer
A blowout preventer is a large, specialized valve or similar mechanical device, usually installed redundantly in stacks, used to seal, control and monitor oil and gas wells.
In addition to controlling the downhole (occurring in the drilled hole) pressure and the flow of oil and gas, blowout preventers are intended to prevent tubing
(e.g. drill pipe and well casing), tools and drilling fluid from being blown out of the wellbore (also known as bore hole, the hole leading to the reservoir)
when a blowout threatens. Blowout preventers are critical to the safety of crew, rig (the equipment system used to drill a wellbore) and environment, and to
the monitoring and maintenance of well integrity; thus blowout preventers are intended to provide fail-safety to the systems that include them.
Most blowout preventer (BOP) stacks contain at least one annular BOP at the top of the BOP stack, and one or more ram-type preventers below.
Annular BOP is an important part of well-control equipments. It mainly applies to control wellhead pressure during drilling workover operations and formation testing etc to prevent well blowout
effectively and realize safe construction. Annular BOP shall be equipped with hydraulic control system. It is usually used with ram BOP and also independently.
Annular BOP consists of the body, upper housing, dust-proof ring, piston and packing elemant etc.
It can seal all size of kelly, drill pipes, drill pipes subs,
drill collar, casing strings and cables in various shapes.
When there is no drilling tool in hole, it can seal the wellhead completely.
It can seal any size of annular space with a kind of rubber if there is a drilling tool, tubing or casing in hole.
When the well blowout and overflow
happens during drilling, coring or well logging, it can seal the annular spaces between Kelly, coring tools, cable, wireline and wellbore.
Under the control of the hydraulic control system which is equipped with a depressuring pressure regulating valve or a cushion accumulator, it can force
stripping with 18°tool joint.
Annular BOP using the spherical packing element
Annular BOP using the conical packing element
Annular BOP using the Combined packing element
Bore Size: 7 1/16～21 1/4 3/4(180mm～540mm)
Working Pressure: 14~105Mpa(2000~15000Psi)
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