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石油钻井中由于井底压力略大于地层压力,使得钻井泥浆侵入到原始地层中,改变地层的电阻率,影响了电阻率测井的准确性.以油水两相流的渗流方程、对流扩散方程和阿尔奇公式为理论模型,采用有限差分方法对泥浆侵入过程进行二维数值离散,针对麻黄山西探区储层实际情况输入模型中有关参数,分别对侵入时间24h和48h,解得给定侵入时刻储层的压力、含水饱和度、地层水矿化度和电阻率在垂向和径向的分布,计算结果与实际情况相符,可用其对实际电阻率测井值进行校正.通过一个低侵算例验证,结果与理论分析相符合,因此该方法可以用于垂向上非均匀储层的泥浆侵入计算.
Because the bottom hole pressure is slightly larger than the formation pressure, the drilling mud intrudes into the original formation and changes the resistivity of the formation, which affects the accuracy of the resistivity log.With the seepage equation, convection-diffusion equation and Archie formula is the theoretical model. The two-dimensional numerical discretization of the mud invasion process is carried out by the finite difference method. According to the actual parameters of the reservoir in the area of Mahuangshan exploration area, the relevant parameters are input into the model. The invasion time 24h and 48h respectively, The reservoir pressure, water saturation, formation water salinity and resistivity in the vertical and radial distribution, the calculated results in line with the actual situation, which can be used to correct the actual resistivity logging values through a low-cost The results are in good agreement with the theoretical analysis. Therefore, this method can be used to calculate the mud invasion of vertically heterogeneous reservoirs.