The filtration and the formation damage coefficients are the parameters in the mathematical models determining the degree of permeability decline during flow of colloidal suspensions in porous media. Measuring pressure in 3 points along the core allows simultaneous calculation of the filtration and the formation damage coefficients. We have calculated the combined standard uncertainties of the filtration and the formation damage coefficients. Application of the law of propagation of uncertainty to Darcy’s equation and the weighted least squares method to impedance index curves for the half- and the overall core resulted in the values of their slopes and intercepts, and the respective combined standard uncertainties. Combination of the values of these slopes into a transcendental equation and solving it analytically fully determined the filtration and formation damage coefficients with their relative combined standard uncertainties being significantly lower than those reported in the literature.

过滤和地层破坏系数是数学模型中的参数，这些模型确定了多孔介质中胶体悬浮液流动过程中渗透率的下降程度。沿岩心的3个点测量压力，可以同时计算过滤和地层破坏系数。我们已经计算了过滤和地层破坏系数的组合标准不确定度。将不确定性的传播定律应用到Darcy方程中，并将加权最小二乘法应用到半芯和整个芯线的阻抗指数曲线中，得出其斜率和截距值以及相应的组合标准不确定性。