Research on ICV Inflow Dynamic Model and Flow Rate Calculation Method

Abstract

Interval Control valve (ICV) is a key part of intelligent well system for downhole fluid control. Matching with packer, ICV is installed in each production layer segment. And independent control of the inflow of each production layer segment can be realized by adjusting the opening degree of the ICV. In this paper, the inflow dynamic model of ICV installed in horizontal well bore is studied on the basis of hydrodynamics. The flow patterns and the causes of pressure drop in the vicinity of the ICV valve hole are analyzed, and the relationship between the flow rate controlled by ICV and the pressure difference inside and outside the valve hole is established. By introducing the relationship between the comprehensive flow coefficient and the area of the ICV valve hole, namely the ICV opening degree, a layered flow rate calculation method based on the ICV opening degree and the PDG pressure data is proposed. The comprehensive flow coefficient is measured and analyzed by using the experimental platform of intelligent well simulation system developed by ourselves, and the variation law of interference correction coefficient under different ICV opening is obtained. The study is of certain reference value and practical significance for our country to design and develop ICV independently and to promote the research and development of intelligent well technology in China.