Mechanical opening-degree valve for controlling yield of each oil layer through remote-control production allocation and control method of valve

Abstract

The invention belongs to the technical field of completion, and discloses a mechanical opening-degree valve for controlling the yield of each oil layer through remote-control production allocation anda control method of the valve. The transformation adjustment of the opening degree of the valve is achieved, and therefore the purpose of controlling the yield of each oil layer through remote-control production allocation is achieved. The valve comprises an upper joint, a guide nail, a rail sleeve, an upper outer cylinder, a lock sleeve, a pipeline pipe, a mandrel, an opening-degree sleeve, a sealing set, a lower outer cylinder, a lower joint, a control pipeline, a sealing ring and the like. The mechanical opening-degree valve enters downwards into the position of a sealing isolation layer along with a production pipe string, a ground hydraulic system conducts pressing operation on the mechanical opening-degree valve through a hydraulic control pipeline connected between the ground and the mechanical opening-degree valve to achieve sequential switching of four positions, and therefore the opening degree of an inlet, where liquid produced at the layer enters, of the production pipe string is adjusted. The mechanical opening-degree valve has the advantages that the control mode is a mechanical hydraulic mode, no electronic components exist under a well, and the safety and reliability are high; the position pressure is displayed and fed back; sealing is reliable; the opening degree is adjustable.

Description

Technical field [0001] The invention belongs to the technical field of well completion. Specifically, it relates to a method of hydraulically controlling a downhole opening valve using a surface hydraulic control pipeline to realize the change and adjustment of the valve opening size, thereby achieving remote control of production allocation and control of the production of each oil layer purpose. Background technique [0002] The main function of the downhole opening valve (or multi-stage sliding sleeve) in the oil field completion technology is to adjust the opening of the fluid channel and effectively realize the production allocation control required by the reservoir. Generally, the downhole opening valve (or multi-stage sliding sleeve) is controlled by pressure in the pipe, cable pipeline and hydraulic control pipeline. It is very difficult to feed back the downhole valve opening state by the way of pressure suppression in the pipe, and the probability of invalid operation ...

AI Technical Summary

Problems solved by technology

However, this kind of sliding sleeve connector is opened or closed by lowering the tubing with a hydraulic switch into the well. Function to control production by regulating flow rate

The downhole multi-stage flow control valve disclosed in Chinese patent CN 201520025275.0 is controlled by a hydraulic control pipeline to achieve the purpose of controlling downhole fluid flow without stopping production. However, this downhole multi-stage flow control valve is limited by the depth of the well. At the same time, the spring mechanical part is used as the core function switch action part, which also increases the unreliability of the tool

Chinese patent CN201020685155.0 introduces a multi-stage flow control valve with a J-groove structure, which is also controlled by two hydraulic control lines. Piston movement for positioning to ensure that the purpose of controlling the downhole flow is achieved, but there is no structural design for the ground to display the opening position of the downhole mechanical opening valve, and there is no structural design for using special mechanical tools to adjust the opening valve in an emergency

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