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《Journal of Oil and Gas Technology》 2010-04
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Experimental Study on Residual Gas Saturation of Water-flooded Sandstone Gas Reservoirs

SHENG Ru-yan (College of Petroleum Engineering,China University of Petroleum,Dongying 257061,Shandong,China)  
Major factors influencing residual gas saturation (RGS) of water drive sandstone gas reservoirs were studied through core simulation experiments with water driving gas.In the three geological parameters of the study,with the increase of porosity,the saturation of residual gas was reduced obviously,As porosity increaseed 10%,the average RGS would reduce 10.18% approximately.The influence Permeability on RGS was more dispersive than that of porosity ,especially when the permeability was less than 30×10-3μm2.When the permeability increased 10 times,the average RGS would reduce about 5.23%.While the influence of original gas saturation with SGR was very dispersive without obvious statistical relation.The following conclusions can be drawn through studies of three artificially controlled parameters: during production in water drive sandstone gas reservoirs,very low or very high rate of gas production is not beneficial for improving the ultimate oil recovery,Reduction of interfacial tension could reduce RGS greatly,minimum RGS of 10.76% is obtained in the study.As water-gas viscosity ratio increases,RGS reduces with a rate of gradual reduction.
【Fund】: 中国石化股份有限公司提高采收率导向性项目(DX0802063)
【CateGory Index】: TE311
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