Viscosity-sensitive flow control valve

Abstract

The invention belongs to the technical field of water control of well completion construction operation and discloses a viscosity-sensitive flow control valve. A floating disc limiting device is arranged between a valve cover and a valve bottom; the valve cover, the floating disc limiting device and the valve bottom are connected and fixed via bolts; a floating disc is arranged between the floating disc limiting device and the valve bottom; the upper surface of the floating disc is a conical sealing surface; the surfaces opposite to the floating disc of the valve cover and the floating disc limiting device are conical sealing surfaces and are located on the same plane; formation fluid flows in via a fluid inlet in the valve cover, then successively flows through a flow-through channel between the floating disc and the valve cover, a flow-through channel between the floating disc limiting device and the valve cover and flow-through holes of the floating disc limiting device and finally flows out via oil outlet holes in the valve bottom. Through the viscosity-sensitive flow control valve, the normal production is carried out when the oil content is high; the floating disc can automatically float up to reduce the opening degree of the valve under the action of liquid pressure difference when the viscosity-reduced flow flows through the flow control valve during formation water production; the yield of the water is inhibited; the purposes of stabilizing oil and controlling water of production wells can be achieved.

Description

technical field [0001] The invention belongs to the technical field of water control in well completion construction operations, and in particular relates to a viscosity-sensitive flow control valve. Background technique [0002] In the middle and late stages of oilfield exploitation, the water content of the oil layer will increase significantly, which will bring many problems to the subsequent treatment and waste a lot of resources. For example, in the process of oil well production, the sand control pipe string is easy to be eroded after partial water breakthrough, causing sand control failure; a sharp rise in water content may also erode the guide wheel of the electric pump blade, resulting in sand blockage after the pump is stuck or stopped; It will increase the load of oil and water treatment on the platform, resulting in an increase in production costs; in addition, if the separated excess production water is reinjected, additional production resources will be occupie...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problem that water control measures cannot be taken according to the water content of the oil layer in the prior art, and provides a viscosity-sensitive flow control valve, which can control the opening of the valve according to the viscosity of the liquid flowing through it. When the water content of the oil layer is low, increase the opening of the flow control valve to achieve more oil production; when the water content of the oil layer is high, reduce the opening of the flow control valve to achieve less water production, thereby controlling the flow of formation fluid into the wellbore The purpose is to ensure more oil production and less water output, which has high practical value

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