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高压低渗气藏具有明显的应力敏感性,通过引入分形参数来描述储层的非均质性,建立了考虑储层应力敏感性的分形气藏气-水两相径向流数学模型及全隐式数值模型,并对分形维数等参数进行了敏感性分析。结果表明,对于应力敏感性气藏,渗透率模量产生的介质变形影响是不可忽视的,尤其是介质变形的不可逆性;此外分形维数和分形指数对气藏生产的影响也是非常显著的。
High-pressure and low-permeability gas reservoirs have obvious stress sensitivity. By introducing fractal parameters to describe reservoir heterogeneity, a gas-water two-phase radial flow mathematical model of fractal gas reservoir considering stress sensitivity of reservoirs is established Implicit numerical model, and the sensitivity analysis of fractal dimension and other parameters. The results show that for stress sensitive reservoirs, the influence of medium deformation caused by permeability modulus can not be neglected, especially the irreversibility of medium deformation. In addition, the influence of fractal dimension and fractal index on gas reservoir production is also very significant.