Determination of Gas-water Relative Permeability in Dongping Bedrock Gas Reservoir

doi:10.11885/j.issn.1674-5086.2020.03.07.01

Abstract

Abstract: The lithology of the bedrock reservoirs in Dongping is different and heterogeneous. The rock is loose and complete core cannot be drilled in zones where pores and fractures are well developed, while the tight zone is almost impervious. So, the relative permeability curve cannot be obtained through displacement experiment. It has become a difficult problem for gas reservoir dynamic analysis and prediction. In order to solve this problem, a calculation method of water saturation of formation at different development time is established based on the principle of water drive gas reservoir material balance. This will improve the accuracy of water saturation by avoiding the uncertain factors in the calculation method of water influx. Based on the fractal dimension of the pore structure and the historical fitting of the water-gas ratio data, the gas-water relative permeability calculation method is established. The fractal dimension limit of pore structure is determined by classifying capillary pressure curve of this gas reservoir, the fractal dimension of reservoir pore structure was determined by historical water-gas ratio data fitting method, and the relative permeability curve of gas and water is calculated. This method can effectively overcome the difficulty in determining the fractal dimension due to the diversity of capillary pressure curves, and the obtained relative permeability curves can better represent the overall seepage characteristics of heterogeneous gas reservoirs. This method not only provides an effective way for gas reservoirs that cannot obtain relative permeability curve through core displacement, but also has reference significance for other bedrock gas reservoirs and seriously heterogeneous gas reservoirs.

Key words: Dongping Gas Field, bedrock gas reservoir, fractal medium, material balance, gas-water relative permeability, production history match

CLC Number:

TE371

LUO Pei, YANG Yun, CHAI Xiaoying, YANG Huijie, WANG Jiong. Determination of Gas-water Relative Permeability in Dongping Bedrock Gas Reservoir[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(2): 93-100.

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