高压高产气井测试管柱螺纹安全分析  

Safety Analysis on Thread of Test String in High Pressure and High Production Gas Wells

作　　者：毛良杰 张孝诚 代清 夏冬青 张鹏翔 Mao Liangjie;Zhang Xiaocheng;Dai Qing;Xia Dongqing;Zhang Pengxiang(State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation,Southwest Petroleum University;School of Oil&Natural Gas Engineering,Southwest Petroleum University;Downhole Service Company,CNPC Chuanqing Drilling Engineering Company Limited;Southern Marine Science and Engineering Guangdong Laboratory(Zhanjiang);Tuha Drilling Company of CNPC Xibu Drilling Engineering Company Limited)

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室 [2]西南石油大学石油与天然气工程学院 [3]中国石油川庆钻探工程有限公司井下作业公司 [4]南方海洋科学与工程广东实验室(湛江) [5]中国石油集团西部钻探工程有限公司吐哈钻井公司

出　　处：《石油机械》2022年第3期146-152,共7页China Petroleum Machinery

基　　金：国家重点研发计划资助项目“深海水合物开采立管水动力载荷分析和甲烷气体演化风险监测技术研究”(2019YFC0312303);中国石油科技创新基金资助项目“天然气水合物开采立管动力特性及安全控制技术研究”(2020D-5007-0210);四川省重点研发项目“复杂构造背景深层页岩气储层地应力场分析关键技术研究与应用”(21ZDYF3109)、“川渝地区复杂地层页岩气勘探开发高效钻井关键技术研究”(21SYSX0054)。

摘　　要：目前,测试管柱力学研究主要集中在测试管柱受到内压、外压、轴力、扭矩、弯矩和黏滞摩阻等多种载荷变化下的屈曲变形,对用于连接测试管柱的螺纹及测试管柱发生变形时螺纹应力分布和强度分析不足。为此,采用有限元软件建立了测试管柱螺纹的有限元分析模型,对测试管柱接头螺纹进行受力分析,研究管柱螺纹应力随纵向载荷变化和有、无上扣扭矩对管柱螺纹应力和强度的影响。研究结果表明:测试管柱螺纹两端扣牙处等效应力较大,其中后端最后一扣的等效应力最大,而中部的扣牙受力相对较小;随着纵向载荷的不断增大,管柱螺纹处的应力幅值不断增大,在不同纵向载荷作用下,管柱内螺纹和外螺纹相互作用力均出现两头大、中间小的形态;有上扣扭矩时,测试管柱扣牙处的应力比无上扣扭矩时大,并且有上扣扭矩会增加后端扣牙的咬合力。所得结果可为测试管柱的安全分析提供理论支持。At present,the researchs on the mechanics of test string mainly focus on the buckling deformation of test string under various loads such as internal pressure,external pressure,axial force,torque,bending moment and viscous friction,but the analysis on the stress distribution and strength of thread used to connect the test string and at the time of deformation of test string is insufficient.Therefore,in the paper,the finite element software was used to build the finite element analysis model of the test string thread,analyze the force applied on the test string joint thread,and study the variation of string thread stress with vertical load and the influence of with and without make up torque on the string thread stress and strength.The study results show that the equivalent stress at the two ends of the test string thread is relatively large,and the equivalent stress at the last thread at the back end is the largest,while the stress at the middle thread is relatively small;as the vertical load continuously increases,the stress amplitude at the thread of the string increases continuously,and under the action of different vertical loads,the interaction forces of the internal and external threads of the string are large at both ends and small in the middle;when there is a make up torque,the stress at the thread of the test string is larger than that without a make up torque,and the make up torque will increase the snap-in force of the back end thread.The study results provide theoretical support for the safety analysis of the test string.

关 键 词：测试管柱 纵向载荷 螺纹应力 上扣扭矩 等效应力 纵向振动 

分 类 号：TE27[石油与天然气工程—油气井工程]