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溶解气油比和原油地层体积因子通常由差异分离试验或闪蒸分离试验获得。但是,不管是差异分离过程还是闪蒸分离过程都不能代表油藏中的流体流动。因此,对于从任何一种试验过程中获得的数据都必须进行修正以接近油藏中的流体性质。在低压下,常规修正方法产生的溶解气油比为负值,原油地层体积因子数值小于1,这在物理上当然是不正确的。本文提出了一种根据分离器条件修正差异分离数据的新方法。新方法克服了常规修正方法的局限性,使溶解气油比曲线的低压延伸部分及原油地层体积因子更准确。新方法基于这样的事实,即从差异分离和闪蒸分离两种试验获得的数据得出油藏条件下的原油相对密度数值相同。新方法使用425份PVT文件进行了测试,其结果与溶解气油比和原油地层体积因子的物理特性是一致的。
Dissolved gas oil ratio and crude oil formation volume factor are usually obtained by differential separation test or flash separation test. However, neither the differential separation process nor the flash separation process can represent the fluid flow in a reservoir. Therefore, the data obtained from any of the tests must be corrected to approximate the fluid properties in the reservoir. At low pressures, the conventional method of correction yields a negative value for the dissolved gas-oil ratio and the value of the volume factor for the crude oil formation is less than 1, which is certainly not physically correct. In this paper, we propose a new method to correct the difference separation data according to the separator conditions. The new method overcomes the limitations of conventional correction methods and makes the dissolved gas-oil ratio more accurate than the low-pressure extension of the curve and the crude oil formation volume factor. The new method is based on the fact that the data obtained from the two tests of differential separation and flash separation show that the relative density of crude oil under reservoir conditions is the same. The new method was tested using 425 PVT files and the results are consistent with the physical characteristics of dissolved gas-oil ratio and crude oil formation volumetric factor.