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膨胀管技术是在井下以机械或液压的方法使管材永久变形、完成油气井建井的技术。它不仅使井身结构产生变形,还大大降低油气井建井成本。管体膨胀后的壁厚是计算抗挤强度的关键要素,根据金属材料冷变形的原理,在对管柱膨胀进行力学分析的基础上,结合金属材料冷变形的体积不变原理,应用管子膨胀时的应力—应变关系推导出膨胀管壁厚变化的计算公式,同时编制了壁厚变化的计算软件。实验数据和计算结果的对比验证了该计算公式是可靠的。
Expansion pipe technology is in the downhole mechanical or hydraulic method of permanent deformation of the pipe, the completion of well drilling technology. Not only does it deform wellbore structure, but it also greatly reduces the cost of well construction. According to the principle of cold deformation of metal material, based on the mechanical analysis of the expansion of the steel tube and the volume invariance principle of the cold deformation of the metal material, the tube expansion is applied When the stress-strain relationship derived tube expansion wall thickness calculation formula, and the preparation of the wall thickness calculation software. The comparison between the experimental data and the calculated results verifies that the formula is reliable.