阀片式水平井ICD控水筛管压降敏感因素分析

Analysis of pressure drop sensitive factors of valve ICD water control screen in horizontal well

针对常规筛管已无法解决油气开采中常见的底水锥进问题,设计一种阀片式水平井ICD控水防砂筛管,在井下完成防砂作业的同时,能够有效抑制水锥的发生。为了评价所设计的控水筛管调流控水能力,分析了不同ICD结构尺寸流道的压降变化规律,计算相应流量系数。研究发现:流道压降随着入口半径的增大而增大,随阀片开启高度的增大而减小,阀片直径与入口高度较入口半径与阀片开启高度对流道压降的影响小;流量系数取决于流道结构,与流速无关。由分析结果可知,所设计的不同筛管入口半径与阀片开启高度,能够达到调节生产压力的目的。

Conventional screen has been unable to solve the problem of bottom water coning in the late stage of oil and gas exploitation. Now, a new type of valve horizontal well ICD water control sand control screen was designed, and the screen can complete the sand control operation and effectively inhibit the occurrence of water coning during the oil recovery process. In order to evaluate the ability of the screen to regulate water flow, the change of pressure drop in the flow channel was analyzed under different sizes of ICD structures. And the corresponding flow coefficient was calculated. The results show that the pressure drop of the flow path increases with the increase of the inlet radius, and decreases with the increase of the opening height of the valve; the diameter of the valve and the height of the inlet have less effect on the pressure drop of the flow path than inlet radius and valve opening height; the flow coefficient depends on the flow path structure, regardless of the flow rate. According to the results, the design of different screen inlet radius and valve opening height can achieve the purpose of regulating production pressure.