摘要
通过室内岩心水驱气模拟试验,研究了影响水驱砂岩气藏残余气饱和度的主要因素。在所研究的3个气藏地质参数中:随着孔隙度的增大,残余气饱和度有明显下降的趋势。孔隙度增加10%,残余气饱和度下降约10.18%。渗透率对残余气饱和度的影响比孔隙度更分散,尤其是渗透率小于30×10-3μm2时。渗透率增加10倍,残余气饱和度下降约5.23%。而原始含气饱和度对残余气饱和度的影响非常分散,未出现明显的统计关系。对3个人为控制参数的研究说明:在水驱气藏的开发过程中,过低或过高的采气速度(导致不同的水侵速度)均不利于改善气藏的最终开发效果。降低界面张力,水驱残余气饱和度会大幅度降低,获得了该次实验最低的残余气饱和度10.76%。随着水气粘度比的增加,残余气饱和度降低,但是降低的幅度在减小。
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.
出处
《石油天然气学报》
CAS
CSCD
北大核心
2010年第4期105-107,118,共4页
Journal of Oil and Gas Technology
基金
中国石化股份有限公司提高采收率导向性项目(DX0802063)
关键词
水驱
残余气
残余气饱和度
砂岩气藏
采收率
water drive gas reservoir
residual gas saturation
sandstone gas reservoir
recovery factor
