分层采油分采器单流球阀流量系数的设计方法∗

摘要

针对分层采油分采器单流球阀流量系数的试验和计算公式还无人尝试的情况，提出单流阀流量系数的设计方法。首先确定单流阀前、后的压差；其次考虑单流阀的动态特性及魏氏效应对分采器内液体连续流的影响，单流阀位移为0时的开启和关闭瞬间单流阀运动的阿道尔夫二阶微分方程存在奇点，确定产出液流过单流阀的体积流量；最后由产出液流过单流阀时的阻力系数，并根据产出液流过单流阀时单位压力损失对应的产出液流量，确定单流阀的流量系数。现场10余口油井的应用中，施工一次性成功率100％，平均日增油2.7 t，平均日降水5.1 m3。提出的设计方法可为产出液流过分层采油分采器单流球阀时流量的准确计算提供依据。%Considering that no study has been focused on the testing and calculation of flow coefficient of check valve for separate layer production device, the check valve flow coefficient design method has been pro⁃posed. The pressure differential front and back the check valve was first determined. The impact of the dynamic characteristics of the check valve and the Westergren effect on the continuous flow in check valve has been consid⁃ered. There exists singularity in the Adolphe second order differential equation of the check valve movement at the opening and closing moments when the valve displacement is 0. The volume flow of produced fluid passing through the check valve has been determined. Based on the resistance coefficient of the check valve and the corresponding fluid flow to the unit pressure loss, the flow coefficient of check valve could be determined. Field applications in more than 10 oil wells had a one⁃time success rate of 100%, with the average increased oil of 2. 7 t/d and the av⁃erage water reduction of 5. 1 m3/d, achieving the purpose of enhancing oil recovery and water reduction.