Fracturing and sand prevention integrated process pipe column capable of preventing erosion and deeply backwashing well and operation method of fracturing and sand prevention integrated process pipe column

Abstract

The invention provides a fracturing and sand prevention integrated process pipe column capable of preventing erosion and deeply backwashing a well and an operation method of the fracturing and sand prevention integrated process pipe column. A well control part comprises a safety valve with a valve clack, an upper hydraulic anchor and an annular packer, and an anti-erosion part comprises an upper sealing cylinder, a hollow insertion pipe and a lower sealing cylinder; the deep inverse well-flushing part comprises a deep well-flushing valve, a well-flushing differential pressure rupture disc, a well-flushing water outlet and an inserted seal in an oil pipe; and the separate-layer fracturing part comprises a Y344 packer, a ball-throwing sand-blasting sliding sleeve, a normally-open sand-blasting sliding sleeve, a lower hydraulic anchor and a check valve ball seat. By means of the method, fracturing and self-spraying production can be achieved through one pipe column, and the construction cost can be greatly reduced; a special safety valve protection mechanism is used, blowout accidents caused by erosion damage of a valve clack of the safety valve in the fracturing process are prevented, the deep well backwashing device is adopted to achieve well backwashing of the whole pipe column, and the risk that the pipe column is stuck by sand is reduced to the maximum extent.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas exploitation, in particular to a fracturing and sand-control integrated process pipe string capable of preventing erosion and deep backwashing and an operation method thereof. Background technique [0002] For low-permeability non-porous reservoirs, fracturing is a commonly used stimulation method, and most of the sand is not produced after fracturing. For wells with high formation pressure coefficient, the proppant is embedded in the formation after fracturing, which greatly increases the formation permeability and fracturing. Post blowout production is often the stimulation method of choice for such wells. [0003] The conventional fracturing string can only be subjected to fracturing. After fracturing, the fracturing string is pulled out and then lowered into the production string, that is, the fracturing string and the production string are carried out in two trips. For the fractu...

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Problems solved by technology

[0005] The invention overcomes the deficiencies in the prior art. The existing fracturing and sand control integrated pipe string has the problems that the safety valve is easily eroded, the pipe string cannot go deep into the backwash well when the pipe string is stuck, and the outside of the pipe string cannot be fully flushed. , providing a fracturing and sand control integrated process string capable of preventing erosion and deep backwashing wells and its operating method. By using the invention, fracturing and self-spray production can be realized in one trip of the string, which can greatly reduce construction costs The present invention uses a special safety valve protection mechanism to prevent blowout accidents caused by the erosion of the safety valve disc during the fracturing process. The present invention uses a deep backwashing device to realize the backwashing of the entire string. Minimizes the risk of string sand sticking

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