SDTK1井钻铤接头二次上扣特性分析与井下等效冲击扭矩预测  

Analysis of secondary makeup characteristics of drill collar joint and prediction of downhole equivalent impact torque of Well SDTK1

作　　者：王春生[1] 明传中[1] 张豪[1] 陈家磊[1] 曲豪 王文昌[2] 狄勤丰[2] WANG Chunsheng;MING Chuanzhong;ZHANG Hao;CHEN Jialei;QU Hao;WANG Wenchang;DI Qinfeng(PetroChina Tarim Oilfield Company,Korla 841000,China;Shanghai Institute of Applied Mathematics and Mechanics,Shanghai University,Shanghai 200072,China)

机构地区：[1]中国石油塔里木油田公司,新疆库尔勒841000 [2]上海大学上海市应用数学和力学研究所,上海200072

出　　处：《石油勘探与开发》2024年第3期608-615,共8页Petroleum Exploration and Development

基　　金：国家自然科学基金项目“考虑隔水管耦合作用的超深水超深曲井钻柱动力学研究”(52174003);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”(52374008)。

摘　　要：基于8"(203.2mm)钻铤接头三维弹塑性有限元模型,分析复杂载荷条件下NC56钻铤接头内、外螺纹的受力特征和井下二次上扣特性,通过有限元分析,根据接头内、外螺纹台肩处相对偏移量计算井下等效冲击扭矩,形成井下等效冲击扭矩的预测模型,利用塔里木盆地GT1井井下实测结果验证该模型正确性,并应用于中国第1口超万米特深井——深地塔科1井(SDTK1井)。结果表明:复杂载荷作用下钻铤接头应力分布不均匀,台肩处和靠近台肩的螺纹牙处vonMises应力水平相对较高;对于按API(美国石油学会)标准上扣的203.2mm钻铤接头,当井下等效冲击扭矩超过65 kN·m时,钻铤接头的上扣预紧平衡被打破,钻铤接头发生二次上扣;随井下等效冲击扭矩的增大,内、外螺纹台肩处相对偏移量增加。SDTK1井井下存在较大冲击扭矩,井下载荷环境复杂,需要采用双台肩钻铤接头以提高接头的抗冲击扭矩能力或优化作业参数来降低井下冲击扭矩,从而有效防止钻具失效。Based on the three-dimensional elastic-plastic finite element analysis of the 8"(203.2 mm)drill collar joint,this paper studies the mechanical characteristics of the pin and box of NC56 drill collar joints under complex load conditions,as well as the downhole secondary makeup features,and calculates the downhole equivalent impact torque with the relative offset at the shoulder of internal and external threads.On the basis of verifying the correctness of the calculation results by using measured results in Well GT1,the prediction model of the downhole equivalent impact torque is formed and applied in the first extra-deep well with a depth over 10000 m in China(Well SDTK1).The results indicate that under complex loads,the stress distribution in drill collar joints is uneven,with relatively higher von Mises stress at the shoulder and the threads close to the shoulder.For 203.2 mm drill collar joints pre-tightened according to the make-up torque recommended by American Petroleum Institute standards,when the downhole equivalent impact torque exceeds 65 kN·m,the preload balance of the joint is disrupted,leading to secondary make-up of the joint.As the downhole equivalent impact torque increases,the relative offset at the shoulder of internal and external threads increases.The calculation results reveal that there exists significant downhole impact torque in Well SDTK1 with complex loading environment.It is necessary to use double shoulder collar joints to improve the impact torque resistance of the joint or optimize the operating parameters to reduce the downhole impact torque,and effectively prevent drilling tool failure.

关 键 词：深地塔科1井 钻具螺纹接头 二次上扣 刻痕偏移量 等效冲击扭矩 

分 类 号：TE921[石油与天然气工程—石油机械设备]