Study On Percolation Mechanism And Numerical Simulation Of Solution Gas Drive In Tight Oil Reservoir

The tighe oil reservoir have well prospect in our country.At present we have imporrant progress in ordos basin,junggar basin and songliao basin.Exploration and research have demonstrated that the tighe reservoir is important replace resource in the future of our country.At present,the development of tighe oil reservoir is mainly used in technology of horizontal well fracturing and relied on the natural energy.So the study of seepage mechanism and reservoir engineering method of tight oil solution gas drive have urgent significance.In this article,we observed the experimental phenomena and measured the gradient resistance of the core when displacement ended.The natural energy development one-dimensional numerical simulation model was built based on displacement experiment.By solving the mathematical model,the artical studied the pressure and saturation distribution.It mainly studied the effect of reservoir boundary,stress sensitivity,capillary force,start-up pressure gradient,bubble jams and dissolved gas oil ratio on the law of fluid output.Then combining the reality,studied the effect of horizontal well and micro fracturis on the production.Finally it had the exploratoryresearch on the energy supplement.The results show that though the development of the tight oil reservoir,after initial short-term high output,oil production rate and gas production rate rapidly diminishing,and maintain low value in long-term time;The value of GOR has a brief rise and fall at the beginning of the production;the gradient resistance increases quickly when the pressure low than the bubble pressure.The stress sensitivity,dissolved gas oil ratio,horizontal well and micro fracturies have the significant effect on production value.At the same time the permeability and the throat radius can be the boundaries of the way to the energy supplement.