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随着深井/超深井、复杂结构井钻井增加,普通钻杆已无法满足大钻压、高泵压和大扭矩钻井的需要,因此双台肩钻具凭借其优良的密封性能和抗扭性能得到油田的认可。但双台肩螺纹的设计、修扣制约着其使用性能,因此针对钻具螺纹接头轴对称特点以及所承受复合载荷的特点,应用接触力学理论建立了将三维问题退化为拟三维问题的有限元半解析法并编制有限元软件,可确定双台肩钻杆接头的公差及其紧扣扭矩。同时,对双台肩钻杆接头在紧扣扭矩的力学性能进行了应变测试,实验结果与软件分析结果一致,说明该理论模型是可靠的。
With the increase of deep well / ultra-deep well and complicated structure well drilling, the conventional drill pipe can not meet the needs of large bit pressure, high pump pressure and high torque drilling, so the double shoulder drill is obtained by virtue of its excellent sealing performance and torsional resistance Oilfield approval. However, the design and repair of double shoulder threads restrict its serviceability. Therefore, according to the characteristics of axial symmetry and the composite load, the contact mechanics theory is used to establish the finite element method which degenerates the three-dimensional problem into the quasi-three-dimensional problem Semi-analytical method and the preparation of finite element software, to determine the tolerance of dual shoulder drill pipe joints and its tight torque. At the same time, the strain test on the mechanical properties of the double shoulder drill joint under the tightening torque is carried out. The experimental results are consistent with the software analysis results, which shows that the theoretical model is reliable.