基于有限元分析的水平井套管柱下入过程模拟

Simulation of Casing String Down Process in Horizontal Wells Based on Finite Element Analysis

在水平井下套管作业中,摩擦阻力是导致套管无法顺利下入井底的重要因素,产生摩擦阻力的最重要原因是套管与井壁的相互接触,为了保证水平井施工中套管能够顺利下入井底,对套管下入过程中有关力学问题进行建模,定量分析摩擦阻力以及套管在下入井底以后的强度问题。该套管模型及其采用的有限元模拟技术,经南堡3-X井下套管作业实践验证,对套管优化设计及其下入安全性有重要的工程意义。

In horizontal casing operation, friction resistance is an important factor that causes casing failure to enter the well bottom smoothly. The most important reason for frictional resistance is the mutual contact between casing and shaft lining. In order to ensure the casing can smoothly enter the bottom of well in horizontal well construction, modeling of mechanical problems during casing down process is done, and quantitative analysis of frictional resistance and the strength of casing after entering the bottom of the well is made. The model and its finite element simulation technology are adopted and verified in the casing operation in Nanpu 3-X well. It is of great engineering significance to optimize casing design and its safety.