Method for flow control and autonomous valve or flow control device

摘要

A method for flow control and a self-adjusting valve or flow control device, in particular useful in a production pipe for producing oil and/or gas from a well in an oil and/or gas reservoir, which production pipe includes a lower drainage pipe preferably being divided into at least two sections each including one or more inflow control devices which communicates the geological production formation with the flow space of the drainage pipe. The fluid flows through an inlet and further through a flow path of the control device passing by a movable disc or movable device which is designed to move relative to the opening of the inlet and thereby reduce or increase the flow-through area by exploiting the Bernoulli effect and stagnation pressure created over the disc, whereby the control device, depending on the composition of the fluid and its properties, automatically adjusts the flow of the fluid based on a pre-estimated flow design.

主权项

1. A method for autonomously adjusting the flow of a fluid through a valve or flow control device into a production pipe of a well in a reservoir containing at least one of oil and gas, said method comprising the steps of:
allowing said fluid to flow through an inlet thereby forming a flow path through the valve or flow control device passing by a movable disc or body which is designed to move relative to the opening of the inlet and thereby reduces or increases the flow-through area of the valve or flow control device; creating, depending on at least the flow-through area and the viscosity of the fluid flowing through the inlet, a fluid pressure difference between opposite sides of the moveable disc or body; and moving the disc or body with a force due to the created fluid pressure difference, such that the viscosity of the fluid is used to control the flow of fluid through said valve or flow control device.