The fractal permeability model in tight sand reservoir accounts for start-up gradient
Received date: 2015-04-09
Revised date: 2015-07-20
Online published: 2016-01-10
Permeability is a key factor to reflect seepage ability of reservoirs.The empirical formula of using pore structure parameters to estimate reservoir permeability is based on the idealized model.Tight sandstone reservoirs are mainly characterized by small reservoir pores,fine throats,and high seepage resistance.These properties cause liquids to flow through such ultra-low permeability porous media,which has the characteristic of non-Darcy flow.Compared with core analytical method,there is a great deviation from real permeability using conventional computing method to get permeability of tight sandstone reservoirs,which is not suitable for productivity calculation.Based on the fractal theory and considering the fractal dimension for capillary tortuosity and nonlinear flow characteristics of liquids,a fractal permeability model is derived which considers threshold pressure gradient.Results show that the permeability is a function of porosity,fractal dimension for pore throat,capillary tortuosity and maximum radius of pore throat,which reflects the effects of microscopic pore structure and the fractal dimension on reservoir permeability.Compared with the previous work,the calculated results had less relative error and were consistent with core analysis results.The new model will be helpful to predict permeability of tight sandstone reservoirs.
Bai Rui-ting,Li Zhi-ping,Nan Jun-xiang,Lai Feng-peng,Li Hong,Wei Qing . The fractal permeability model in tight sand reservoir accounts for start-up gradient[J]. Natural Gas Geoscience, 2016 , 27(1) : 142 -148 . DOI: 10.11764/j.issn.1672-1926.2016.01.0142
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