井筒造斜弯肘处冲蚀规律数值模拟分析
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摘要
基于欧拉-拉格朗日多相流模型方法,采用RNG k-ε湍流模型对两口页岩气井水力压裂过程中井筒套管内的携砂压裂液多相流动过程进行了全尺寸数值模拟。计算结果表明,压裂砂在惯性及压裂液的携带作用下与井筒套管发生多次碰撞磨削,冲蚀速率随着入弯角度的增大逐渐增大,在井筒造斜入弯角45度之前出现两处最大冲蚀速率危险点,并提出了优化建议措施。
Based on Euler-Lagrange multi-phase flow numerical simulation method,the fracturing liquid-sand multiphase flow in a shale gas casing was studied by using RNG k-ε turbulent model. The results showed that the fracturing sand collided with wellbore pipe wall several times due tosand 's movement inertia and fracturing liquid's carry-on effect,and that the erosion rate gradually increased with the bending angle. There were two erosion rate peaks beforethe bending angleof the wellbore inclinationelbow reached 45°. Optimization suggestions were provided in the end.
Based on Euler-Lagrange multi-phase flow numerical simulation method,the fracturing liquid-sand multiphase flow in a shale gas casing was studied by using RNG k-ε turbulent model. The results showed that the fracturing sand collided with wellbore pipe wall several times due tosand 's movement inertia and fracturing liquid's carry-on effect,and that the erosion rate gradually increased with the bending angle. There were two erosion rate peaks beforethe bending angleof the wellbore inclinationelbow reached 45°. Optimization suggestions were provided in the end.
引文
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[2]唐颖,张金川,张琴,等.页岩气井水力压裂技术及其应用分析[J].天然气工业,2010,30(10):33-38.
[3]卢斌,秦绩,邹云.油井管柱抗冲蚀性能研究进展[J].化学工程与装备,2011(10):159-160.
[4]李碧曦.腐蚀与力学共同作用下储气库管柱疲劳寿命预测[D].重庆:重庆科技学院,2016.
[5]练华章,魏臣兴,宋周成,等.高压高产气井屈曲管柱冲蚀损伤机理研究[J].石油钻采工艺,2012,34(1):6-9.
[6]孙丽丽.水力压裂工况下典型材质损伤行为及机理研究[D].大庆:东北石油大学,2015.
[7]冯留海,王江云,毛羽,等.突扩突缩管内液-固冲蚀的数值模拟[J].石油学报(石油加工),2014,30(6):1080-1085.
[8]张书进.压裂管柱内固液两相流动特性及磨损机理研究[D].大庆:大庆石油学院,2010.
[9]郭胜江,吴广庆,陈国邦.适用于回流区流体力学模拟计算的三种高雷诺数湍流模型的比较[J].制冷学报,2005,26(3):26-29.
[10]POSTLETHWAITE J,NESIC S.Erosion in disturbed liquid/particle pipe flow:Effects of low geometry and particle surface roughness[J].Corrosion Engineering,1993,49(10):850-857.