高温高压高产斜井油管柱摩擦磨损失效机理研究  

RESEARCH ON FAILURE MECHANISM OF FRICTION-WEAR OF TUBING STRING IN 3 H CURVED WELL

作　　者：郭晓强 李潇 柳军[1] 黄亮 方达科 魏安超 GUO XiaoQiang;LI Xiao;LIU Jun;HUANG Liang;FANG DaKe;WEI AnChao(College of Mechanical and Electrical Engineering,Southwest Petroleum University,Chengdu 610500,China;Zhanjiang Branch,CNOOC(China)Co.,Ltd.,Zhanjiang 524057,China)

机构地区：[1]西南石油大学机电工程学院,成都610500 [2]中海石油(中国)有限公司湛江分公司,湛江524057

出　　处：《机械强度》2023年第1期156-168,共13页Journal of Mechanical Strength

基　　金：中国博士后科学基金项目(2021TQ0273);国家自然科学基金项目(51875489,52105125);中国科学院天然气水合物重点实验室(中国科学院广州能源研究所)项目(E229kf15);四川省自然科学基金(2022NSFSC19222)资助。

摘　　要：针对高温高压高产(三高)气井油管柱磨损失效问题,采用微元法、能量法结合哈密顿原理建立了油管柱非线性流致振动模型,模型考虑了井眼轨迹变化、井筒温度压力变化和套管接触碰撞等因素,通过开展油管柱振动模拟试验验证了模型的正确性和有效性。基于White-Fleisher磨损理论,提出了三高气井油管柱磨损量和磨损深度计算方法,试验测定了油管柱摩擦因数和磨损效率,在此基础上,系统分析了产量、井斜角、井段长度、封隔器位置和扶正器位置对油管磨损特性的影响规律,提出了现场油管柱防磨、减磨方法,即:随产量的增加,管柱磨损寿命呈现降低的趋势,且存在一个突变产量,现场配产设计时,采用提出的分析方法确定突变产量,使现场配产远离突变产量;井眼轨迹设计时,尽量减小直井段长度,增加造斜段长度和稳斜段井斜角,提高油管寿命;封隔器和扶正器设置都存在一个最优位置,此位置与井身结构、管柱结构的因素有关,需采用提出的分析方法确定最优位置,指导井下工具的设计。研究成果可有效提高三高气井油管柱的使用寿命。Aiming at the wear failure of tubing string caused by the nonlinear flow-induced vibration(FIV) in high-temperature, high-pressure and high-yield(3H) gas wells, the nonlinear FIV model of tubing string was established using the element method, energy method and Hamilton variational principle, which considered the changes of wellbore trajectory, wellbore temperature/pressure, and contact of casing. A simulation experiment of the tubing string vibration was conducted to verify the correctness and validity of the nonlinear vibration model. Based on the White-Fleisher wear theory, a calculation method for the wear amount and depth of tubing string in 3H gas wells is proposed. The wear unit test is carried out, and the friction coefficient and wear efficiency are determined. On this basis, the influence of production rate, well angle, well section length, packer position and centralizer position on wear characteristics of tubing is systematically analyzed. The safety control methods of tubing string were proposed, namely, which shown that, firstly, with the increase of production rate, the wear life of the string decreases, and there is a sudden value, which can be determine using the analysis method, so that the field production allocation should be far away from the sudden production rate. Secondly, in the well trajectory design, the length of vertical well section should be reduced, and the length of build section and the angle of stable inclined section should be increased. Thirdly, there is an optimal position of packer and centralizer in the field, which is related to the well structure, string structure and downhole tool size, and can be determined by the proposed analysis method to guide the design of packer and centralizer. The research results can effectively improve the service life of tubing string in 3H gas wells.

关 键 词：三高气井 油管柱 非线性流致振动 磨损特性 磨损失效机理 

分 类 号：TE38[石油与天然气工程—油气田开发工程]