新型钻具特殊螺纹优化设计  

Optimum Design of Special Thread of New Drilling Tools

作　　者：谢贵琪 付颖 冯昕媛 雷丰宇 乔星宇 XIE Guiqi;FU Ying;FENG Xinyuan;LEI Fengyu;QIAO Xingyu(Drilling and Production Technology Research Institute of PetroChina Qinghai Oilfield Company,Dunhuang,Gansu 736200,China)

机构地区：[1]中国石油青海油田公司钻采工艺研究院,四川省成都市610500

出　　处：《钻采工艺》2024年第1期132-137,共6页Drilling & Production Technology

基　　金：中国石油油气钻完井技术国家工程研究中心科学研究基金项目“随钻扩眼器管柱动力学分析及振动抑制研究”(编号:F2023239)。

摘　　要：随着勘探开发向深部发展,对钻具接头的连接强度提出了更高的要求。根据钻具接头受载时螺纹牙的力学特征,设计出一种双台肩锯齿状螺纹牙新型特殊螺纹接头,该结构内表面平滑,降低压耗,螺纹锥度小。文章基于接头抗扭性能理论计算公式与螺纹牙变形原理,提出了一种新型钻具特殊螺纹结构,利用正交优化的方法优选结构参数,得到最优参数为锥度1∶16,螺距7.25 mm,牙高4.10 mm,承载角-3°,导向角45°。进而采用ABAQUS对比计算了普通接头、双台肩接头、新型钻具特殊螺纹接头在井下拉扭复合载荷下的承载性能。结果表明,相较于普通接头和双台肩接头,新型钻具特殊螺纹接头水眼增大10.3%,抗拉性能分别提升15.4%和10.9%,应力集中分别优化22.0%和16.6%,特殊螺纹接头的疲劳寿命分别提高11.2%和7.6%。As exploration and development moves into deeper reservoirs,higher requirements are put forward for the connection strength of Drilling tools joints.According to the mechanical characteristics of the thread teeth when the drill pipe joint is loaded,a new type of special thread joint with double shoulder serrated thread teeth is designed.The inner surface of the structure is smooth,the pressure consumption is reduced,and the thread taper is small.Based on the theoretical calculation formula of joint torsion resistance and the principle of thread deformation,a new type of special thread structure of drilling tool is proposed in this paper.Orthogonal optimization method was used to optimize the structure parameters,and the optimal parameters were obtained,taper 1∶16,pitch 7.25 mm,tooth height 4.10 mm,bearing angle-3°,guiding angle 45°.Then ABAQUS is used to compare and calculate the bearing capacity of common joint,double shoulder joint and special thread joint of drill pipe under combined tension and torsion combined load in the well.The results show that compared with the ordinary joint and the double shoulder joint,the water hole of the new drill pipe special thread joint is increased by 10.3%,the tensile property is increased by 15.4%and 10.9%,the stress concentration is optimized by 22.0%and 16.6%,and the fatigue life of the special thread joint is increased by 11.2%and 7.6%.

关 键 词：钻具接头 特殊螺纹 正交优化 承载性能 有限元分析 

分 类 号：TE921[石油与天然气工程—石油机械设备]