摘要
以连续管为研究对象,分别采用解析法和有限元计算方法对直管、不同曲率半径弯管和变径管的压降进行计算分析。在不同排量、不同曲率半径、不同管径和不同流体介质下,采用2种方法计算的管道压降最大相对误差为6%。通过数值计算方法对现有压降公式进行修正,推导了弯管临界曲率半径的计算方法,得到了变径比大于0.3的变径管道压降计算方法。试验测试结果表明:实测压降与理论计算压降最大相对误差为14%,进一步验证了修正的压降计算公式的准确性。研究结果为连续管安全和泵送压力计算提供了理论依据。
Taking the coiled tubing as the study object, the pressure drop of straight tube , bend tube with different radius and varied diameter tube have been calculated and analyzed by using analytic method and finite ele-ment method respectively. The maximum relative error of the pressure drop calculated by the two methods is 6 % under different displacement, curvature ra d iu s, diameters and fluid mediums. The current pressure drop calcula-tion formula has been corrected using the numerical calculation method. The calculation method of the critical radi-us of curvature of the bend tube has been deduced , and the calculating method for the pressure drop of the varied diameter tube with the diameter ratio higher than 0. 3 has been obtained. The testing results show that the maximum relative error between the measured pressure drop and the theoretical pressure drop is 14%, which further validates the accuracy of the modified pressure drop formula. The results provide theoretical basis for the safety operation of coiled tubing and the calculation of pumping pressure.
出处
《石油机械》
2017年第2期96-102,共7页
China Petroleum Machinery
基金
国家自然科学基金项目"超短半径水平井钻具的柔度与载荷传递机理研究"(51674088)
关键词
连续管
直管
弯管
变径管
压降
coiled tubing
straight tube
bend tube
varied diameter tube
pressure drop
