Rapid well abandoning device for deepwater high-pressure gas well

Abstract

The invention relates to a rapid well abandoning device for a deepwater high-pressure gas well, and belongs to the technical field of offshore well abandoning. The device is composed of an upper casing pipe, a lower casing pipe, a drill rod, a flange plate, a ball valve mechanism and a sliding mechanism, wherein, the flange plate is fixedly arranged in the lower casing pipe, the sliding mechanism is movably inserted in the flange plate, the ball valve mechanism is sleeved with the portion, on one side of the flange plate, of the lower casing pipe, the upper casing pipe is arranged on one side of the lower casing pipe, and the drill rod is arranged in the upper casing pipe in an annular space mode. According to the rapid well abandoning device for the deepwater high-pressure gas well, the sliding plate is driven by a pressing plate to move downwards, so that the ball valve rotates to close a center hole, high-pressure gas at the bottom of a well is effectively prevented from moving upwards, the influence of the high-pressure gas at the bottom of the well is avoided in the well abandoning process, the well abandoning efficiency can be improved, and the working time of well abandoning operation is saved; and through cooperation of a self-locking hole and a self-locking key, return stroke of the sliding plate is stopped, leakage of high-pressure gas at the shaft bottom caused by opening of the ball valve is prevented, and the plugging quality is guaranteed.

Description

technical field [0001] The invention relates to a deep-water high-pressure gas well rapid well abandonment device, which belongs to the technical field of offshore well abandonment. Background technique [0002] With the continuous development of oil and gas resources, a large number of old offshore oil and gas wells are gradually abandoned. In order to avoid the harm to the ecological environment caused by the uphole high-pressure gas in the abandoned offshore oil and gas wells, it is necessary to permanently seal the abandoned oil and gas wells. In the process of offshore well abandonment, due to the advantages of simple and convenient operation and permanent high pressure resistance, the method of cement plugging at intervals is usually used for plugging to prevent the underground high-pressure gas from going up. [0003] During the specific construction process, due to the long solidification time of the cement plug, the working time of the well abandonment operation was...

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Problems solved by technology

[0003] During the specific construction process, due to the long solidification time of the cement plug, the working time of the well abandonment operation was prolonged. In the case that the offshore operation platform required a daily cost of about 2 million yuan, the long solidification time of the cement plug caused additional damage. High platform usage fees, resulting in increased costs

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