摘要
大位移长水平井开发的后期,存在着大摩阻的问题,严重制约钻具向更远目标的快速钻进,在世界范围内引起了广泛关注。水力振荡器是油井开发后期降摩减阻的重要工具。针对该问题提出了一种涡轮式水力振荡器。该水力振荡器通过静阀与转阀流道口之间的相位变化将钻井液的动能转化为周期性脉冲压力,有效地解决了钻井过程中出现的托压和自锁问题。分别对圆形流道口、扇形流道口与正方形流道口进行优化设计,发现正方形流道口的降摩减阻效果最好。运用理论计算与FLUENT流体仿真分析,研究静阀与转阀的运动规律以及流道的尺寸和长度对阀组压降的影响,得到一组最优的阀组尺寸:中间流道口的半径为14.2 mm,正方形外流道口的边长为27 mm,流道长度为30 mm。研究结果表明该结构可以提供0.096~2.96 MPa的稳定脉冲压力。
In the later stages of the development of extended-reach long horizontal wells,there is a problem of large friction,which severely restricts the rapid drilling of the drill tool to a farther target,and has attracted widespread attention worldwide.Hydraulic oscillator is an important tool for friction reduction in the later stage of oil well development.To solve this problem,a turbine-type hydraulic oscillator was proposed.The kinetic energy of the drilling fluid was converted into periodic pulse pressure through the phase change between the static valve and the flow passage of the rotary valve,which effectively solves the problems of back pressure and self-locking during the drilling process.The circular runner,sector runner and square runner were optimized respectively.It is found that the friction reduction effect of square runner is the best.By using theoretical calculation and FLUENT fluid simulation analysis,the motion law of static valve and rotary valve and the influence of the size and length of flow channel on the pressure drop of valve group were studied,and a group of optimal valve group sizes were obtained:the radius of middle flow channel is 14.2 mm,the side length of square outflow channel is 27 mm and the length of flow channel is 30 mm.The results show that the structure can provide a stable pulse pressure of 0.096~2.96 MPa.
作者
冯超
徐华静
黄剑
夏成宇
刘健
钱利勤
FENG Chao;XU Hua-jing;HUANG Jian;XIA Cheng-yu;LIU Jian;QIAN Li-qin(College of Mechanical Engineering, Yangtze University, Jingzhou 434023, China;Zhuangxi Oil Production Plant, Shengli Oil Field Company, Dongying 257000, China)
出处
《科学技术与工程》
北大核心
2022年第9期3525-3531,共7页
Science Technology and Engineering
基金
国家自然科学基金(51405032)
非常规油气省部共建协同创新中心开放基金(UOG2020-04)。
关键词
涡轮式水力振荡器
流体仿真
圆形流道口
扇形流道口
正方形流道口
turbine hydraulic oscillator
fluid simulation
circular runner mouth
fan-shaped runner mouth
square runner mouth
