Model and method of permeability evaluation based on mud invasion effects
Zhou Feng1,2, Hu Xiang-Yun2, Meng Qing-Xin3, Hu Xu-Dong2, and Liu Zhi-Yuan4
1. School of Mechanical Engineering and Electronic Information, China University of Geosciences (Wuhan), Wuhan 430074, China.
2. Institute of Geophysics and Geomatics, China University of Geosciences (Wuhan), Wuhan 430074, China.
3. College of Exploration Technology and Engineering, Shijiazhuang University of Economics, Shijiazhuang 050031, China.
4. Research Institute of Petroleum Exploration and Development, SINOPEC, Beijing 100083, China.
Abstract：
The evaluation of permeability in reservoir assessment is a complex problem. Thus, it is difficult to perform direct evaluation permeability with conventional well-logging methods. Considering that reservoir permeability significantly affects mud invasion during drilling, we derive a mathematical model to assess the reservoir permeability based on mud invasion. A numerical model is first used to simulate the process of mud invasion and mud cake growth. Then, based on Darcy’s law, an approximation is derived to associate the depth of mud invasion with reservoir permeability. A mathematical model is constructed to evaluate the reservoir permeability as a function of the mud invasion depth in time-lapse logging. Sensitivity analyses of the reservoir porosity, permeability, and water saturation are performed, and the results suggest that the proposed model and method are well suited for oil layers or oil–water layers of low porosity and low permeability. Numerical simulations using field logging and coring data suggest that the evaluated and assumed permeability data agree, validating the proposed model and method.
Zhou Feng,Hu Xiang-Yun,Meng Qing-Xin et al. Model and method of permeability evaluation based on mud invasion effects[J]. APPLIED GEOPHYSICS, 2015, 12(4): 482-492.
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2015, Vol. 12 
