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等井径膨胀套管技术可实现无内径损失钻井,是一项钻井完井领域的革命性技术。作为核心技术之一的膨胀套管螺纹接头在膨胀成形时易发生断裂或漏失,是制约该技术发展的主要难点。文章利用有限元软件ABAQUS模拟了4种材料螺纹接头的膨胀成形过程,分析了成形过程中膨胀推力和Mises应力的变化情况,并对成形后螺纹接头的残余应力进行了分析。结果表明,相较于其它3种材料,N80所需膨胀推力较大;孪生诱发塑性(TWIP)钢和奥氏体不锈钢S30408能顺利完成膨胀成形过程,J55和N80钢材会发生断裂;TWIP钢和S30408螺纹接头成形后残余应力峰值出现在根部位置,且整体区域残余应力较小。
The equal-caliber expansion casing technology enables drilling without ID loss and is a revolutionary technology in the field of well completion. As one of the core technologies, the expansion casing threaded joint is prone to rupture or leakage when it is expanded and formed, which is the main difficulty that restricts the development of the technology. In this paper, the finite element software ABAQUS was used to simulate the expansion process of the four kinds of materials, and the variation of expansion thrust and Mises stress during the forming process were analyzed. The residual stress of the screw joint after forming was analyzed. The results show that the thrust of N80 is larger than that of the other three materials. TWIP steel and austenitic stainless steel S30408 can finish the expansion process smoothly, and the fracture of J55 and N80 steel will occur. TWIP steel and S30408 threaded joint after forming the peak residual stress in the root position, and the overall regional residual stress is smaller.