Blowout preventer for oil field workover treatment

Abstract

The invention belongs to the technical field of oil field workover treatment appliances, and provides a blowout preventer for oil field workover treatment. The blowout preventer comprises a body, flanges are mounted on the upper end and the lower end of the body, a set of two seal gate plates which are oppositely mounted are slidingly mounted in an inner cavity of the body, and are used for achieving a full seal function of the blowout preventer or a semi seal function of the blowout preventer through change fit of opposite positions, rubber blocks are embedded on the seal gate plates, and areused for sealing a string of the blowout preventer or full close, tightening release shafts extending out of the blowout preventer body are connected to the two seal gate plates, and are used for driving the seal gate plates to move oppositely or move in a reverse manner, a seal structure is used, the technical effects of two seal functions of semi seal and full seal can be achieved, the size andthe weight of the whole device can be reduced, the safety coefficient can be increased, transport, maintaining, loading, unloading and site mounting are convenient, the blowout preventer is portableand easy to operate, the structure is simple, use is convenient, and the blowout preventer is suitable for large-scale popularization and use.

Description

technical field [0001] The invention relates to the technical field of equipment for oil field workover operations, in particular to a blowout preventer for oil field workover operations. Background technique [0002] At present, in the process of lifting and lowering pipes and rod strings in oil field workover operations, if a blowout sign occurs, the usual measures are: to close the wellbore and realize the sealing of the wellhead according to the function of selecting the corresponding layer number according to whether there is a pipe string in the wellbore. The existing blowout preventer is equipped with two or more layers of sealing rams, each layer has different functions, and each layer can only realize one function, especially the fully sealed ram, which has insufficient efficiency and safety performance. The fully-sealed ram structure is to control whether the seal is tight or not by tightening the tightness of the screw rod when the rams at both ends are parallel t...

AI Technical Summary

Problems solved by technology

The existing blowout preventer is equipped with two or more layers of sealing rams, each layer has different functions, and each layer can only realize one function, especially the fully sealed ram, which has insufficient efficiency and safety performance. The fully-sealed ram structure is to control whether the seal is tight or not by tightening the tightness of the screw rod when the rams at both ends are parallel to the position of the central through hole. The safety performance is not good enough, and the seal is vulnerable to the impact of the fluid in the well and thus fails. Due to the multi-layer structure The design of the wellhead makes the height of the wellhead too high during the construction process, and it is inconvenient to operate during the construction process of pipes and rods. The wellhead is too high to cause safety accidents. The original blowout preventer is extremely heavy in the process of transportation, loading and unloading, on-site installation, movement, and maintenance. , inconvenient, easily lead to safety accidents

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