Marine abandoned wellhead cutting device based on plasma arc cutting

Abstract

The invention relates to a marine abandoned wellhead cutting device based on plasma arc cutting and application of the marine abandoned wellhead cutting device. The marine abandoned wellhead cutting device comprises a supporting mechanism, a rotating mechanism, a feeding mechanism, a cutting mechanism and a guiding mechanism. The supporting mechanism is used for providing underground support for the whole device and guaranteeing that the lower rotating mechanism of the supporting mechanism is located in the center of a casing pipe; the rotating mechanism is used for driving the feeding mechanism and the cutting mechanism to rotate so as to achieve the purpose of casing pipe girdling; the feeding mechanism is used for adjusting the distance between the cutting mechanism and the inner wall of the casing pipe; the cutting mechanism is used for generating high-temperature plasma arcs to realize cutting operation; and the guiding mechanism provides guiding for the whole device, and it is guaranteed that the device can be smoothly lowered in the axial direction of the casing pipe. The marine abandoned wellhead cutting device is simple and compact in structure, good in stability, low in equipment manufacturing cost and large in application range; by by using plasma arcs for cutting, the marine abandoned wellhead cutting device is small in cutting force, free of vibration, efficient incutting, free of pollution and capable of greatly reducing the operation cost so as to be good in economic benefit and market value and worthy of application and popularization.

Description

technical field [0001] The invention relates to a marine abandoned wellhead cutting device based on plasma arc cutting, which belongs to the technical field of petroleum drilling equipment. Background technique [0002] At present, with the development of the offshore oil production industry, a large number of offshore oil production platforms are built in the ocean field, and the offshore platforms have a service life. When the service life is reached, they must be dismantled. According to the relevant regulations of our country, for the abandoned wellhead in the ocean, the casing cement sheath including the underwater wellhead head system must be cut and recycled four meters below the mud line, and no artificial structures shall be left above the mud line. Therefore, this requires a special marine abandoned well cutting and recovery device to complete this task. At present, the methods of cutting abandoned wells on the seabed mainly include mechanical cutting, abrasive wa...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the disadvantages of high cutting cost, low efficiency, large cutting force, large vibration, poor stability, and pollution existing in the current marine abandoned wellhead cutting technology, the present invention provides a marine abandoned wellhead cutting device based on plasma arc cutting. The cutting has high cutting efficiency, strong destructive power, small cutting force, and can cut metal and non-metal properties. Introducing it into the cutting operation of marine abandoned wells can greatly increase the cutting speed and reduce the cutting cost. Efficiency Green Cut

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