Oil and gas well cementation tubular column and well cementation method

Abstract

The invention discloses an oil and gas well cementation tubular column and a well cementation method. The oil and gas well cementation tubular column comprises a casing pipe. A float shoe, a float collar, a blasting sliding sleeve and a well shut-in sliding sleeve are sequentially arranged on the sleeve from bottom to top. A blasting piece and a piston are arranged in the blasting sliding sleeve. The blasting piece is used for pushing the piston to move to form a fluid channel in the blasting sliding sleeve for well cementation construction, a self-locking device is arranged in the well shut-in sliding sleeve and used for closing the fluid channel, a cement plug is formed, and well cementation construction is completed. The novel well cementation method that the float collar and the float shoe fail to be opened, and after the well cementation tubular column descends to a preset position, pumping cannot establish circulation is provided, construction efficiency is improved, and working risks are reduced.

Description

technical field [0001] The invention belongs to the technical field of petroleum well completion, and in particular relates to an oil and gas well cementing device and method. Background technique [0002] During cementing operations, floating hoops and floating shoes are important casing accessories, and their reliability directly affects the quality of cementing. Due to the downhole environmental factors and the factors of the floating hoop and the floating shoe, many wells have failed to open the floating hoop and the floating shoe. After the cementing tool string is lowered to the predetermined position, the pump cannot establish circulation, which will lead to the high pressure on the wellhead. Pipelines, circulating operation equipment and field operators pose a huge threat, and at the same time lead to the failure of the next cementing operation to proceed normally. If measures cannot be taken to solve the blocking problem, it is necessary to propose the entire entry...

AI Technical Summary

Problems solved by technology

Due to the downhole environmental factors and the factors of the floating hoop and the floating shoe, many wells have failed to open the floating hoop and the floating shoe. After the cementing tool string is lowered to the predetermined position, the pump cannot establish circulation, which will lead to the high pressure on the wellhead. Pipelines, circulating operation equipment and field operators pose a huge threat, and at the same time lead to the failure of the next cementing operation

In the case of taking measures that cannot solve the blocking problem, it is necessary to propose the entire entry string for inspection one by one, which not only wastes time, but also increases operational risks

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