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深层油藏的储层由于承受很高的压力和温度 ,开发这些油田的过程中 ,储层要发生部分或全部的不可逆变形 ,会明显地影响这些油田的动态特征。利用解析法和数值法对变形介质中一维非线性 -弹性直线渗流的数学模型进行求解 ,得到不同边界条件下的压力分布 ,所得结果与常规的线性 -弹性不稳定渗流解进行了比较 ,并着重分析了渗透率的变化对地层压力分布的影响 ,分析表明 :当变形介质的弹性增加时 ,对于注水井来说 ,若给定注入量 ,则地层压力上升的越缓慢 ,若给定井底流压 ,则注入量增加 ;对于生产井来说 ,若给定产量 ,则地层压力下降的越剧烈 ,若给定井底流压 ,则产量下降。变形介质油藏的开发应以保持原始地层压力为前提 ,这样 ,才能得到较高的采收率。
Due to the high pressure and temperature experienced by reservoirs in deep reservoirs, some or all irreversible deformation of reservoirs during the development of these fields will obviously affect the dynamic characteristics of these fields. The analytical solution and numerical method are used to solve the one-dimensional nonlinear elastic-plastic linear seepage flow in the deformation medium. The pressure distribution under different boundary conditions is obtained. The results are compared with the conventional linear-elastic unsteady seepage solution The effect of permeability change on formation pressure distribution is analyzed emphatically. The analysis shows that when the elasticity of deformation medium increases, the pressure of formation rises more slowly for a given injection volume. If given bottom hole flow Pressure, the injection volume increases; for production wells, the more severe the formation pressure drops if a given production volume is given, and the production will decrease if a bottom-hole flow pressure is given. The development of the deformation medium reservoir should be based on the premise of maintaining the original formation pressure so as to obtain a higher recovery rate.