Annular blowout preventer


Classification:

Well control equipment


When there is a tubular column in the well, it can use a kind of rubber core to close the annular space formed by the tubular column and the wellhead; (2) When the well is empty, it can fully seal the wellhead.

Annular blowout preventer
Annular blowout preventer
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  • Annular blowout preventer
  • Annular blowout preventer

Product Details


I. What is the function of annular blowout preventer?

(1) When there is a tubular column in the well, it can use a kind of rubber core to close the annular space formed by the tubular column and the wellhead; (2) When the well is empty, it can fully seal the wellhead.

(2) When the well is empty, the wellhead can be fully sealed.

(3) In the process of drilling and milling, grinding casing, logging and salvaging downhole falling objects, if overflow or blowout occurs, it can seal the space formed by square drilling rods, cables, wire ropes as well as tools for dealing with accidents and the wellhead; and

(4) With the cooperation of pressure-reducing regulator or small energy storage device, it is able to carry out forcible lifting and lowering operation on 18° butt-welded pipe column joints without fine buckling.

(5) In case of serious overflow or blowout, it is used to cooperate with the gate blowout preventer and throttling manifold to realize soft shutdown.

II, What should be paid attention to when shutting down the well with annular blowout preventer to raise and lower the drilling tools?

(1) Only 18 degrees of butt-welded drill pipe joints without fine buckles are allowed to be raised and lowered.

(2) A small amount of leakage between the rubber core and the drill pipe is not only permissible, but also necessary. A small amount of leaking drilling fluid can lubricate and cool the rubber core and improve the life of the rubber core. If necessary, lubricating fluid can be added to the top of the rubber core to lubricate the rubber core.

(3) The speed of starting and stopping drilling must be slow, and even more so when crossing the joint.

III, the working principle of the ring blowout preventer

Conical rubber core ring blowout preventer working principle conical rubber core ring blowout preventer shutdown action, the pressure oil from the hydraulic control system into the lower oil chamber (shutdown oil chamber) to promote the piston quickly upward, the rubber core by the limitations of the top cover can not be upward, in the role of the piston within the taper is forced to the center of the borehole extrusion tightening, ring around the drilling tool to close the annular space of the wellhead. When there is no drilling tool in the well, the rubber core is squeezed and tightened to the center until the hollow part of the rubber core is filled with rubber, thus sealing the wellhead completely. At the same time, the hydraulic oil in the upper oil chamber flows back to the oil tank through the hydraulic control system pipeline. When the conical rubber core ring blowout preventer is opened, the pressure oil from the hydraulic control system enters the upper oil chamber (open oil chamber) and pushes the piston to move down quickly. Piston taper on the rubber core of the extrusion pressure quickly disappeared, the rubber core by its own rubber elasticity outward stretching, to restore the original state, the wellhead is fully open. At the same time, the hydraulic oil in the lower oil chamber flows back to the oil tank through the pipeline of the hydraulic control system.

Key words:

Annular blowout preventer

Looking forward to cooperating with you

Telephone

+86-546-8268456

Fax

+86-546-8269456

International labor export service telephone

+86-546-8269456

Company Address

Huatai International Financial Center, 1188 Lushan Road, Dongying District, Dongying City, Shandong Province, China

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