注水过程中萨中地区原油饱和压力的变化

Change of Sazhong Region’s Oil Bubble Point Pressure in the Process of Flooding

在介绍７种国内外原油饱和压力计算相关式的基础上，根据油层流体物性参数和有关资料，运用回归分析理论，建立了萨中地区萨葡高油层原油饱和压力相关式，并使用５种误差参数和一个相对性能因数来评价７种相关式的计算精度。对现场获取的油气水试样，用ＧＦ７３１型高压物性仪，测得原油饱和压力值。结果表明，油藏含水率上升，原油饱和压力下降，但不同层位的下降幅度有所差异。又根据现场实际状况给出了不同含水条件下萨中地区原油饱和压力表达式。

On the basis of summarizing calculative correlations of oil bubble point pressure both inside and outside China, according to fluid physical character parameters and related data of reservoirs ,theory of regress analysis was applied, correlations of oil bubble point pressure of Sapugao reservoirs in Sazhong region were built,and five error parameters and one relative performance coefficient were used to evaluate calculative precision of seven correlations. Oil bubble point pressure of oil gas water samples were measured with GF731 high pressure physical property apparatus. Experimental results show that oil bubble point pressure decreases when water cut increases,but decrease of different layer was different.Finally bubble point pressure expressions for different water cut conditions in Sazhong region were given.