Patent ID: 8875797
Filing Date: 2014-11-04
Classification: E21B,F16K,G05D

Abstract:
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.