Due to the complex distribution of gas and water in low permeability gas reservoirs in the East China Sea,there are obvious nonlinear seepage characteristics and time-varying effects of phase seepage,and conventional numerical simulation methods have limitations in the characterization of complex seepage mechanism.In view of the problems,the motion equation is improved based on the study of seepage mecha-nism,the initial fluid saturation distribution and time-varying law of seepage parameters are clarified,and the seepage mathematical model is established considering the time-varying effect of fluid nonlinear seep-age.Based on parameter sensitivity analysis,the influence of special seepage mechanism on the develop-ment of low permeability gas reservoir is determined.The method is tested through the practical application of H gas field in the East China Sea.The results indicate that the range of gas well utilization and bottom hole flow pressure are reduced by the influence of nonlinear seepage.The time-varying effect leads to an increase in gas well water production and a decrease in stable production time.The numerical simulation method can improve the fitting accuracy of the low permeability gas reservoir,and the simulation results are consistent with the actual production performance of the gas well,which provides a basis for the subsequent fine development.
关键词
低渗气藏/非线性渗流/相渗时变/可动水/数值模拟
Key words
low permeability gas reservoir/nonlinear flow/time-varying phase permeability/moveable water/numerical simulation
维普
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