特深井井下等效冲击扭矩作用下钻铤接头三维力学特征分析  

Three-Dimensional Mechanical Characteristics of Drill Collar Joints under Downhole Equivalent Impact Torque in Extra-Deep Well

作　　者：曲豪 陈锋[2] 陈家磊[1] 张豪[1] 明传中[1] 李吉荣 QU Hao;CHEN Feng;CHEN Jialei;ZHANG Hao;MING Chuanzhong;LI Jirong(PetroChina Tarim Oilfield Company,Korla,Xinjiang,841000,China;School of Mechatronics Engineering and Automation,Shanghai University,Shanghai,200444,China)

机构地区：[1]中国石油塔里木油田分公司,新疆库尔勒841000 [2]上海大学机电工程与自动化学院,上海200444

出　　处：《石油钻探技术》2024年第2期211-217,共7页Petroleum Drilling Techniques

基　　金：国家自然科学基金项目“特深井‘钛-钢’复合钻柱动态安全性及异型材质接头失效机理研究”(编号:52374008);“考虑隔水管耦合作用的超深水超深曲井钻柱动力学研究”(编号:52174003);上海市重点学科建设项目(编号:S30106)联合资助。

摘　　要：特深井钻井时钻柱在井下受到强烈的冲击扭矩作用,严重威胁着钻井施工安全,需要进行特深井钻柱井下冲击扭矩的测量和分析。首先,采用三维力学分析方法得到了不同扭矩作用下钻铤螺纹接头的受力特征,建立了内、外螺纹之间相对偏移量与井下等效冲击扭矩之间的对应关系;然后,以西部油田某特深井上部井段ϕ203.2 mm钻铤NC56接头为例,利用刻痕法测量内、外螺纹台肩的相对偏移量,反演得到与偏移量相对应的井下等效冲击扭矩,并用实际测得的钻铤接头卸扣扭矩进行了验证。实测数据表明,钻井过程中井下存在很大的冲击扭矩,使钻铤接头在井下发生二次上扣。根据实测偏移量反演计算的井下等效冲击扭矩与卸扣扭矩吻合程度高,表明该方法具有较好的可靠性。分析表明,上扣预紧状态对钻铤接头的井下二次上扣特性有很大影响,避免欠扭矩上扣是防止钻铤接头井下二次上扣的有效手段。The drilling string in extra-deep wells is subjected to strong downhole impact torque during drilling,and its safety is facing severe challenges.Therefore,it is important to measure and analyze the downhole impact torque of drilling strings in extra-deep wells.First,the three-dimensional(3D)mechanical analysis method was used to obtain the mechanical characteristics of drill collar joints under different torque.Using that information,the corresponding relationship between the relative offset between internal and external threads and the downhole equivalent impact torque was established.Then,with the NC56 joint ofϕ203.2 mm drill collar in the upper section of an extra-deep well in an oilfield of western China as an example,the relative offset between internal and external thread shoulders was measured by the scratching mark,and the downhole equivalent impact torque corresponding to the offset was obtained through inversion and verified with the measured breakout torque of the drill collar joint.The measured data show that there was a large downhole impact torque during drilling,which can cause the drill collar joint to bring about downhole secondary makeup.The downhole equivalent impact torque calculated by the inversion of the measured offset is well consistent with the breakout torque,which shows a good reliability of the method.The results indicate that the pretightening state exerts a great influence on the downhole secondary makeup characteristics of the drill collar joint,and avoiding under-torque makeup is an effective means to prevent the drill collar joint from secondary makeup torque.

关 键 词：等效冲击扭矩 钻铤接头 上扣扭矩 三维力学分析 相对偏移 特深井 

分 类 号：TE921.2[石油与天然气工程—石油机械设备]