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针对低压特低渗透油藏较常规低渗透油藏储集层岩石压力敏感性更强的特点,推导了考虑启动压力和渗透率压力敏感性变化下的无因次采油(液)指数计算公式。以吐哈油田牛圈湖低压特低渗油藏为例,讨论了油水粘度比、启动压力和渗透率变形系数动态变化时无因次采油、采液指数与含水率的变化关系。研究结果表明,低压特低渗油藏启动压力的动态变化对无因次采油指数有较明显的影响;此外,无因次采液指数受启动压力和渗透率变形系数的影响也较常规低渗透油藏更为明显。
In view of the fact that the pressure of low pressure and low permeability reservoir is more sensitive to rock pressure than conventional low permeability reservoirs, the formula of dimensionless production (liquid) index is deduced considering pressure sensitivity of starting pressure and permeability. Taking the low pressure and ultrahigh permeability reservoir of Niuhuan Lake in Tuha Oilfield as an example, the relationship between oil - water viscosity ratio, dynamic pressure and permeability coefficient of deformation, dimensionless oil recovery, liquid production index and moisture content was discussed. The results show that the dynamic change of start-up pressure of low-pressure extra-low permeability reservoir has a significant influence on the dimensionless oil recovery index. In addition, the dimensionless liquid production index is more affected by the start-up pressure and permeability deformation coefficient than the conventional low permeability The reservoir is more obvious.