实现井眼等直径钻井是膨胀管技术的终极目标,而套管之间的螺纹连接处为其膨胀成形过程中最危险的部位,应重点关注。以孪生诱发塑性(TWIP)钢为研究对象,利用有限元软件ABAQUS模拟了不同温度下螺纹接头的膨胀成形过程,分析了成形过程中膨胀力、Mises应力和三向应力的演化情况,并对成形后螺纹接头的残余应力做出了分析。结果表明,随着温度的增加,螺纹接头所需膨胀力逐渐减小;螺纹接头成形过程中径向应力和轴向应力以压应力为主,环向应力以拉应力为主;螺纹接头成形过程中以及成形后,随着温度增加,Mises应力峰值与抗拉强度之差逐渐变小,螺纹接头越容易失效。 The realization of borehole diameter drilling is the ultimate goal of expansion tube technology, and the threaded connection between the casing is the most dangerous part of its expansion forming process, which should be the focus of attention. Taking TWIP steel as the research object, the finite element software ABAQUS was used to simulate the expansion process of the nipples under different temperatures. The evolution of expansion force, Mises stress and three-direction stress during the forming process were analyzed. The residual stress of the post-threaded joint was analyzed. The results show that with the increase of temperature, the required expansion force decreases gradually. The radial stress and axial stress of the threaded joint are mainly compressive and the circumferential stress is mainly of tensile stress. The forming process of the nipple After forming, as the temperature increases, the difference between the Mises stress peak value and the tensile strength becomes smaller, and the more easily the threaded joints fail.