A full wellbore anti-back-vomiting layered water injection string

Abstract

The invention relates to a full wellbore anti-back-vomit layered water injection string in the technical field of oil production tools, which includes a plurality of eccentric single-flow water distributors connected along separate oil injection pipes. Layers, the oil injection pipes between adjacent eccentric single-flow water distributors are respectively connected with anti-spitting packers to seal off adjacent water injection layers, and the lower side of the most end eccentric single-flow water distributor The oil distribution pipe is sequentially connected with an anti-reflux check valve, a sand settling tailpipe and a plug. The whole wellbore anti-reflux layered water injection string of the present invention overcomes formation regurgitation caused by formation pressure fluctuations after the injection is stopped, which is regurgitated through separate injection supporting tools to the wellbore and the pressure difference serial flow regurgitation between the separate injection layers adverse effects on downhole tools, formation stability, and separate injection tests.

Description

technical field [0001] The invention relates to the technical field of oil production tools, in particular to a full wellbore anti-back-vomiting layered water injection string. Background technique [0002] Layered water injection technology is an effective measure and means to improve the conflict between layers and strengthen injection-production adjustment, and it has been paid attention to in oilfield development. However, with the deepening of development, due to the lack of systemic anti-spitting function of the layered water injection string, after the water injection well stops injecting, the formation pressure fluctuates greatly, which is likely to cause rock skeleton damage, resulting in sand production and casing damage in the formation; formation fluid returns to the wellbore At the same time, the water injection and well flushing channels are blocked, resulting in problems such as sand burial, resistance to test deployment, and short validity period of separate ...

AI Technical Summary

Problems solved by technology

[0004] (1) Anti-emitting of a single supporting tool in the layered water injection string: the most researched is the anti-ejection of the single flow valve, and there is little research on the anti-ejection channels of other supporting tools in the layered water injection string, which is lack of system;

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