Annular BOP

② When there is no pipe in the well, the wellhead can be completely enclosed.

③ Under the control of using a pressure-reducing pressure regulating valve or buffer accumulator, the drilling tool can be forcibly lifted up and down through a 180-shoulder butt-welded drill pipe joint, but the lifting speed should be slow, and even slower when passing through the joint (not more than 0.2 m/s). The shut-in pressure when forcibly pulling up and down the drilling tool can be appropriately reduced, allowing a small amount of leakage between the rubber core and the drill pipe. Whether forced tripping and running of drilling tools can be carried out must also consider the downhole conditions and safe construction conditions.

① Tapered rubber core annular blowout preventer.

The tapered rubber core has a large rubber storage capacity, and the rubber between the ribs of the rubber core can be squeezed towards the wellhead to form a seal. The rubber volume is much larger than the volume of the space that needs to be closed. Therefore, it can seal drilling tools of different shapes and size, and can also completely seal the wellhead.

② Spherical rubber core annular blowout preventer.

The spherical rubber core Annular BOP is designed for offshore drilling and can be installed in underwater equipment or on a drilling floating vessel. When a spherical core is used to seal the drill string, not only can the core slide up and down along the drill string with the waves, but also the core and the BOP form a ball twist. The drill string can be tilted in any direction relative to the BOP, which has a sealing effect on the core. small. It has the advantages of labor-saving control and long core life.