Two-dimensional numerical simulation of mud invasion

被引：3
作者：
Chang W.-H. [1 ,2 ]
Pan H.-P. [1 ]
Zhou F. [1 ]
机构：
[1] Institute of Geophysics and Geomatics, China University of Geosciences
[2] Digital Well Logging Station, North China Petroleum Bureau
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2010年 / 35卷 / 04期
关键词：
Finite difference method; Two-phase flow; Water-base mud; Well logging;
D O I：
10.3799/dqkx.2010.082
中图分类号：
学科分类号：
摘要：
Due to the pressure difference between borehole and reservoirs, drilling mud invades the original reserviors while drilling for petroleum, changing the formation resistivity, which has a negative effect on resistivity logging. Based on the theoretical model of two-phase flow equation, convection-diffusion equation and Archie formula, finite difference method is adopted to discretize mud invasion models in the way of two dimensions. Parameters of the reservoir in Mahuangshan area, Ordos basin, north-central China, with the mud invasion time of 24, 48 hours respectively are input for the model, and the vertical and radial distributions of pressure, water saturation, salinity and formation resistivity in the designated time are worked out. The computing results are consistent with fact instance, and can be used for correcting resistivity logging values for mud invasion reservoirs. A case of low invasion is computed and the results prove to conform to the theoretical analysis. This method can be used in mud invasion of vertical inhomogeneous medium.
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页码：674 / 680
页数：6
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