Well washing tool and water injection string

Abstract

The invention relates to a well washing tool and a water injection tubular column, and belongs to the technical field of petroleum engineering. The well washing tool comprises a working barrel and a well washing valve. The working barrel is provided with a main channel, an eccentric channel, a first liquid inlet hole and a second liquid inlet hole, the first liquid inlet hole is communicated with the outside of the working barrel and the main channel, the second liquid inlet hole is communicated with the main channel and the eccentric channel, and the first liquid inlet hole is located below the second liquid inlet hole. The well washing valve is provided with a hollow cavity, a third liquid inlet hole and a fourth liquid inlet hole, the third liquid inlet hole and the fourth liquid inlet hole are communicated with the outside of the well washing valve and the hollow cavity, the third liquid inlet hole is located below the fourth liquid inlet hole, and a valve head of the well washing valve is located between the third liquid inlet hole and the fourth liquid inlet hole. The well washing valve is located in the main channel of the working barrel, the first liquid inlet hole is opposite to the third liquid inlet hole, and the second liquid inlet hole is opposite to the fourth liquid inlet hole. When the well washing tool provided by the embodiment of the invention is used for backwashing a well, the well washing valve cannot be buried by particulate matters such as sand grains, and the sand resistance and the reliability of the well washing tool are relatively high.

Description

technical field [0001] The present application relates to the technical field of petroleum engineering, in particular to a well cleaning tool and a water injection pipe string. Background technique [0002] The well flushing valve is mainly used at the bottom of the water injection pipe string, and its functions are: when liquid is injected from the inside of the water injection pipe string, the well flushing valve is closed, and the liquid cannot enter the outside of the water injection pipe string through the well flushing valve; when it is necessary to backflush the well When the well flushing fluid is injected from the casing, it enters the water injection string through the well flushing valve, and returns from the wellhead, taking out the debris inside the casing and the water injection string at the same time. [0003] However, after the backflushing is completed, the sand and other particles in the well-flushing fluid will fall down the tubing. When there are many sa...

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Problems solved by technology

[0003] However, after the backwash is completed, the sand and other particles in the well flushing fluid will fall down the oil pipe. When there are many sand and other particles, the sand and other particles will deposit at the well flushing valve, and even bury the well flushing valve, causing Flushing valve failure

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