论文部分内容阅读
储层渗透率的测量及其储层条件下的转化方式是油藏工程研究的重要内容。随着储层岩石有效应力的增加,储层岩石孔隙半径减小,渗透率降低,地面测量的岩石渗透率比地层条件下的渗透率高。为将地面测量的渗透率应用于油藏工程,须将其换算到储层条件。根据岩石在地面和地层条件下的应力状态,研究了地面—地下渗透率的转换方法,该方法采用三维地应力,克服了仅采用上覆地层压力的不足。胜利油区渗透率覆压实验校正结果表明,仅采用上覆地层压力计算的渗透率转换值,比采用三维地应力计算的渗透率转换值明显偏小。对于中渗透地层,三维地应力的渗透率转换方法与原方法差别不大,对于低渗透地层,基于三维地应力的渗透率转换方法的计算值比原方法增大约10%。
The measurement of reservoir permeability and its transformation under reservoir conditions are important contents of reservoir engineering research. With the increase of reservoir effective stress, the pore radius of reservoir rock decreases and permeability decreases. The rock permeability measured by the ground is higher than the permeability under formation conditions. In order to apply the permeability measured at the surface to reservoir engineering, it must be converted to reservoir conditions. According to the stress state of rock under ground and formation conditions, the method of ground-ground permeability transformation is studied. The method uses three-dimensional ground stress to overcome the shortage of overburden pressure. The results of overburden test in Shengli oilfield show that the permeability conversion calculated by using overburden pressure is obviously smaller than the permeability conversion calculated by 3D geostress. For medium permeability strata, the three-dimensional geostress method is not significantly different from the original one. For low-permeability strata, the calculated value based on the three-dimensional geo-stress permeability method is about 10% higher than the original method.