Blowout preventer unit for workover rig

Abstract

The invention belongs to the field of oil exploitation, and particularly relates to a blowout preventer unit for a workover rig. The blowout preventer unit comprises a ram preventer body, an annular blowout preventer shell and an annular rubber core. The annular blowout preventer shell is fixedly connected to the top of the ram preventer body. The annular rubber core and a sealing block are arranged in the annular blowout preventer shell, and the sealing block is located at the top of the annular rubber core. A first piston is arranged at the bottom of the annular rubber core. A second piston is arranged at the bottom of the sealing block. According to the blowout preventer unit, the annular rubber core is reserved and can achieve the sealing and shielding effects, and blowout objects are basically prevented from being continuously guided into the position of the sealing block; when the blowout state is stopped, the sealing block is controlled to conduct sealing, and the situation that a large number of foreign matter is clamped into the sealing face position of the sealing block, and the sealing effect is influenced is avoided; and sealing is conducted through the hard sealing block, the strength of a sealing structure is guaranteed, and therefore the continuous sealing effect can be achieved.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation, in particular to a blowout preventer group for a workover rig. Background technique [0002] The blowout preventer is used to close the wellhead during oil testing, workover, and completion to prevent blowout accidents. It is a safety sealing wellhead device commonly used in oil fields to prevent blowout. It is usually a large gate equipped with a ram type blowout preventer. During operation, a sealed annular space will be formed between the pipe string and the wellbore, and the well sealing can also be completed independently when there is a pipe string in the well. [0003] A Chinese patent with the application number CN113250640A discloses a ring-shaped blowout preventer. The bottom of the casing is movably installed with a rotating sleeve, and the inside of the casing is movably installed on the top of the support cylinder. The inside of the casing is located on the outer ring of the sup...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, in the blowout preventer group, through the combined use of the ram blowout preventer and the annular blowout preventer, the annular blowout preventer can completely seal the wellhead of the oil well, and is the last barrier for the blowout at the wellhead. However, the interior of the existing annular blowout preventer is sealed by the deformation of the elastic annular rubber core, the number of times of use is limited, and it is not allowed to shut down the well for a long time

Images