Interlaminar multistep control valve used for well completion

Abstract

The invention relates to an interlaminar multistep control valve used for well completion, which is applied to oil well repair construction. A lower hydraulic joint is fixed on the lower part of an upper joint; an inner sleeve is connected with the upper joint; the inner sleeve is provided with three rows of discharge orifices; the lower end of the upper joint is connected with an upper cylinder sleeve; the lower part of the upper cylinder sleeve is provided with a liquid channel; an annular space is formed between the upper cylinder sleeve and the inner sleeve; a piston, a jump ring sleeve and a jump ring are arranged in the annular space between the upper cylinder sleeve and the inner sleeve; the lower end of the upper cylinder sleeve is connected with a lower cylinder sleeve; an annular space is formed between the lower cylinder sleeve and the inner sleeve; the lower end of the lower cylinder sleeve is connected with a base; the base is provided with a liquid flow channel; the lower end of the inner sleeve is connected with a lower joint; and a hydraulic pipe and an upper hydraulic joint are fixed on the outer wall of the lower part of the upper joint. The invention has the effects that the underground multiple zone production can be controlled, and step flow control is completed, and thereby, the flow is better regulated according to reservoir pressure and temperature parameters to realize oil production by layer.

Description

technical field [0001] The invention relates to the technical field of petroleum recovery, in particular to a downhole multistage control valve device in well workover construction. Background technique [0002] In the process of layered oil production of oil wells, the interlayer control valve is the core component, key device and final execution equipment of the well completion system. Its main function is to connect or disconnect the connection between the tubing and the annulus, so as to control the downhole fluid entering the wellbore . [0003] At present, the sliding sleeves used in oilfield operations are mainly used for water finding and water blocking, and are controlled by the way of running cables. Patent 98235710.9 has introduced a kind of sliding sleeve device of oil well seeking water, shutting off water. The upper part of the sliding sleeve and the lower limit body of the device are designed with spring claws. After the downhole tool is lowered into the cor...

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Problems solved by technology

[0004] Both of the above two methods need to stop the normal production of the oil well, and use the method of running the cable, which increases the operation time and is only used for water search and water plugging

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