关键词: 油气井, 堵漏技术, 波纹管, 膨胀, 位移, 应力, 有限元分析

Abstract: On the basis of leak plugging in oil and gas drilling engineering,the variation rule of displacement and stress of expandable-profile liners during expanding process was analyzed by using the software ANSYS and field test.The expanding strain of expandable-profile liners was calculated by means of dual non-linear analysis.The nephograms of equivalent stress and the variation rule of displacement and stress of expandable-profile liners during expanding process were obtained.The result of the calculation was verified by field test.The simulation and calculation results for the expanding process of profile liners were isomorphic and consistent with the tested result.The stress and strain of the expandable-profile liners were symmetrically distributed over the geometric shape of the pipeline,but equivalent stress and equivalent strain on the different region of pipes rested with the curvature radius.The maximal equivalent stress and strain appeared in the wave peak and wave trough.The mathematical formulations about diameters of expandable-profile liners and value of expanding pressure were regressed.

Key words: oil gas well, leak plugging technology, expandable-profile liners, expansion, displacement, stress, finite element analysis