离心毛管压力曲线表征及应用

回眸了利用离心毛管压力曲线实验数据,确定岩石的孔隙大小分布,分析岩石的单相流体流动特性,在室内快速评价油井工作液对储层的损害,确定润湿性和驱替能量,计算绝对渗透率和相对渗透率方法。用三参数双曲线方程拟合离心毛管压力实验数据,采用最小二乘法求解,获得毛管压力曲线解析表达式及其积分表达式和微分表达式,可拟合各类毛管压力曲线整个数据范围,便于曲线微分、积分、,准确计算岩心的入口饱和度,光滑实验数据、进行曲线外推求阈压。

REVIEW IN CHARACTERISTICS AND APPLICATION OF CAPILLARY PRESSURE CURVES FOR CENTRIFUGE DATA

In this paper, the authors have reviewed the method of determination the pore-size distribution of porous materials using centrifuge capillary pressure data. The useful method for the characteristics of the fluid flow properties of rocks, for evaluation production well working fluid to formation damage, for es-timation of threshold pressure, for determination of wettability and the energy for fluid displacements, for calculation absolute permeability and relative permeability, which is based on the pore-entry size distribution, has been developed. The three-parameter form of the hyperbola fitted to capillary pressure laboratory data, obtain capillary pressure curves analytical function,differential and integral expression by least-squares solution. Itcan fit the capillary pressure curves throughout the range of data, and obtain accurate the inlet saturation for centrifuge-derived data, and smooth laboratory data, and extrapolate to 100% single-phase saturation to obtain the correct threshold pressure.