基于封隔器式膨胀管的有限元数值模拟分析

Finite element numerical simulation analysis of packer-type expansion pipe

摘要:

封隔器式膨胀管技术被研发用于水文地质勘探护壁和破损井井管补贴修复，具有成本低、工艺简单的特点。为了使封隔器能满足膨胀管的要求，对封隔器膨胀机构进行了改进，利用封隔器对不同性能的管材进行了试验，根据试验结果决定选择316L不锈钢作为膨胀管管材。为了研究封隔器式膨胀管两次膨胀过程中膨胀压力与膨胀管长度和厚度变化的关系，通过Abaqus软件对Φ219 mm，壁厚为4 mm的膨胀管膨胀过程进行数值模拟，以获得膨胀过程中的应力和应变变化情况，并对同样规格的膨胀管进行野外试验，然后把模拟结果与试验结果对比，得出结论是模拟结果与实际示范结果基本相同，说明数值模拟结果可以作为实际施工的参考。

Abstract:

The packer expansion tube technology has been developed for the hydrogeological exploration of wall protection and the repair of damaged well pipes. It has the characteristics of low cost and simple process. In order to make the packer meet the requirements of the expansion pipe, the expansion mechanism of the packer is improved. The packer is used to test the pipes with different properties. According to the test results, 316L stainless steel is selected as the expansion pipe. In order to study the relationship between the expansion pressure and the change of the length and thickness of the expansion tube during the two expansions of the packer-type expansion tube, the expansion process of the expansion tube with Φ219 mm and wall thickness of 4 mm was numerically simulated by Abaqus software to obtain the change of stress and strain during the expansion process, and field tests were conducted on the expansion tube with the same specifications. Then comparing the simulation results with the test results, it is concluded that the simulation results are basically the same as the actual demonstration results, indicating that the numerical simulation results can be used as a reference for the actual construction.