Annular blowout preventer is an important part of well control equipment. It is mainly used to control wellhead pressure in drilling, workover and oil testing operations, effectively preventing blowout accidents and realizing construction. The sleeve type annulus blowout preventer must be equipped with a hydraulic control system before it can be used. It is usually used with the ram blowout preventer, but it can also be used alone. There are two forms of rubber core: spherical and conical.

1. What is the function of the annular blowout preventer?

1. When there is a pipe string in the well, a rubber core can be used to seal the annular space formed by the pipe string and the wellhead;

2. The parallel port can be fully sealed when the well is empty;

3. In the process of drilling, milling, grinding casing, logging, and salvaging falling objects in the well, the annular blowout preventer can seal the kelly, cables, wire ropes, accident handling tools and the formation of the wellhead if overflow or blowout occurs. space;

4. With the cooperation of a pressure reducing valve or a small accumulator, the 18 butt welded pipe string joints can be forced up and down;

5. In case of severe overflow or blowout, use the ram blowout preventer and choke manifold to achieve soft shut-in.

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2. What should be paid attention to when starting and running the drilling tool when shutting in the well with the annular blowout preventer?

(1) Only 18-degree butt-welded drill pipe joints are allowed.

(2) During the tripping process, there is a small amount of leakage between the rubber core and the drill pipe. This is not only allowed, but also necessary. A small amount of leaking drilling fluid can lubricate and cool the rubber core and prolong the service life of the annular blowout preventer. When necessary, lubricating fluid can be added to the top of the rubber core to lubricate the rubber core.

(3) The drilling speed of the annular blowout preventer must be slow, especially when it passes the joint.

The above is the main function and precautions of the annular "Blowout Preventer" we have organized for you. We will continue to organize more exciting information for you, so stay tuned!