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中国西南山区蕴藏着丰富的天然气资源,但随着开发规模的日益扩大,天然气井逐步转向山区这类地质环境恶劣的地区。本文以西南山区某气井为原型,在详细阐明井场区地质环境背景特征的基础上,首先对井场出现的典型地质问题——地下采空区进行定性判断和分析;之后选用F lac-2D有限差分软件,对井场加载前/后地下采空区可能造成的井场地基应力和变形特征,采用双洞和采空区这2种计算模型,进行数值模拟分析。模拟结果表明,井场加载前/后地基最大位移量为2 mm,地基局部地段出现拉应力区,但总体上地基稳定。研究结论将为后期建设中井场建筑物的优化布局及基础的选型提供依据。
There are abundant natural gas resources in mountainous areas in southwest China, but with the increasing development scale, natural gas wells are gradually turned to such poor geological environment as mountainous areas. In this paper, a gas well in the southwest mountainous area is taken as a prototype. Based on the detailed description of the geological background of the wellsite area, the paper firstly qualitatively analyzes and analyzes the typical geological problem in the wellsite, Finite difference software, the stress and deformation characteristics of the wellsite in the wellsite before / after the loading of the wellsite are simulated. Two kinds of calculation models of double holes and goafs are adopted for numerical simulation analysis. The simulation results show that the maximum displacement before and after the wellsite loading is 2 mm, and the tensile stress zone appears in the local part of the foundation, but the foundation is generally stable. The conclusion of the research will provide the basis for the optimization layout and foundation selection of the middle wellsite construction in the later period.