Water injector for automatically balancing downhole flow of oilfield

Abstract

The invention belongs to a water injector for automatically balancing the downhole flow of an oilfield, which is used for a water injection pipe network system of the oilfield. The water injector comprises a valve body and a valve core symmetrical with a middle axis of the valve body; the water injector is characterized in that a spring on an annular groove of inner wall of the valve body which isa tapered cavity supports the valve core; the upper end face of the valve core is tightly pressed by a locking nut which is in threaded connection with the valve core; the wall periphery of an uppercavity of the valve core is symmetrically distributed with at least two throttling holes; the locking nut and the valve body are in threaded connection; and the lower end face of the locking nut is tightly pressed on the upper end face of the valve core. Under the condition of changing the pressure difference of injected water, the water injector can maintain the water injection amount constant, greatly shorten the regulating time, and reduce the labor intensity of laborers and the regulating cost of a water injection well, has good dynamic performance, and good self-stabilizing capacity on the fluctuation of the pressure difference of the injected water, improves the quality of injected water, does not need to modify other parts of the prior system, can be directly used for the downhole stratified water injection of the oilfield and remarkably improves the injection and production efficiency of the oilfield and the service life of a water injection system.

Description

technical field [0001] The invention belongs to a water injection device used in an oilfield water injection pipe network system and capable of automatically balancing the downhole water injection flow—an oilfield downhole flow automatic balance water injector. Background technique [0002] With the gradual expansion of secondary and tertiary oil recovery ratios in oilfields, the water injection volume of each oil reservoir, each injection-production well group, and each layer must strictly implement the geological injection requirements to ensure ideal oil production. Too little will not achieve the effect of increasing the formation pressure, and too much water injection will cause uneven advancement of the oil layer, forming an underground passage, causing premature water breakthrough in the oil well, leaving a large number of dead oil areas in the oil layer, which will not only cause waste of water injection , also reduces oil recovery in oilfields. In order to achieve ...

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Problems solved by technology

[0003] The purpose of the present invention is to provide an oil field downhole flow automatic balance water injector, which can keep the output flow rate dynamic and constant under the state of water injection pressure fluctuation, so as to overcome the change of the water injection flow rate of the existing water injector with the change of the pressure difference between the inlet and outlet ends. Unable to achieve quantitative water injection

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