Constant-flow water distributor for water injection well

Abstract

The invention discloses a constant-flow water distributor for a water injection well. The constant-flow water distributor comprises a positioning pipe, an upper joint, a water outlet cylinder, an inner sealing ring, an outer sealing ring, a flow adjusting piston, a spring, an inner cylinder, a limiting pin, a switch pipe and a lower joint. A downhole measuring instrument is lowered, a fixed claw of the downhole measuring instrument enters a fixed claw groove on the positioning pipe, a moving claw of the downhole measuring instrument enters a moving claw groove on the switch pipe, the downholemeasuring instrument can drive the switch pipe to rotate, and water outlet grooves communicates with water outlet holes. The water injection pressure acts on the flow adjusting piston, so that the flow adjusting piston compresses the spring to move downwards, a boss at the lower part of the flow adjusting piston enters the expanding section, a water injection channel is communicated, and the communicating area is adjusted to adjust the water injection amount. When the water injection pressure and the stratum water absorption generate fluctuation, the position of the flow adjusting piston in the axial direction changes, the position of the throttling reducing section entering the inner boss below the water injection hole in the water outlet cylinder is different, the water injection amountis kept unchanged basically, and the constant flow injection of stratum is realized.

Description

technical field [0001] The invention is a downhole layered water injection tool for water injection in an oil field, and is a constant flow water distributor for a water injection well. Background technique [0002] When developing oilfield water injection, it is necessary to inject water into the water injection well. Generally, the water injection well has multiple water injection layers. Water distribution is carried out according to the distribution amount, and a water injection distributor is required for water distribution, that is, each water injection layer has a water injection distributor. One of the existing water injection distributors is a hollow water distributor. After adjusting the injection volume of the existing hollow water injection distributor, the water injection volume cannot remain unchanged, and it will still fluctuate with the change of the ground water injection pressure and the water absorption capacity of the formation. There is still a large ga...

AI Technical Summary

Problems solved by technology

One of the existing water injection distributors is a hollow water distributor. After adjusting the injection volume of the existing hollow water injection distributor, the water injection volume cannot remain unchanged, and it will still fluctuate with the change of the ground water injection pressure and the water absorption capacity of the formation. There is still a large gap between the actual injection volume and the designed injection volume, resulting in inaccurate formation water injection volume, which fails to meet the allocation requirements, making the oilfield unable to achieve the ideal water injection effect, and affecting oilfield development and production

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