Study On The Development Technique Of Top Gas Injection And Gravity Stable Driving Of Dh Reservoir

The paper describes the top of the reservoir gas injection flooding gravity stable displacement mechanism,the mechanism of gas injection and the application status for mine are summarized.Have the systematic understanding of the current domestic and international situation of gas injection,and elaborated DH reservoir geological characteristics.The study area provides a gas injection and geological knowledge base.Firstly,the paper studies the development of the oil reservoir effect evaluation,analyze the moisture,pressure keeping level,the utilization of water injection,the driving mode,the driving energy and the water flooding recoverable reserves calibration.The paper also study the gravity stable drive mechanism and its applicability.Determine the way of gas injection and gravity stable displacement and carry out a formation fluid PVT analysis,gas injection and oil displacement efficiency evaluation mechanism and other laboratory experiments by combining theoretical research and DH reservoir geological characteristics and reservoir characteristics.Do formation oil phase experiments and determine the oil reservoir was better for gas injection to improve oil recovery.Experimental results show that the expansion of formation fluid hydrocarbon gas injection fluid properties can be improved.According to the results,use the numerical simulation method to study the process of flooding of underground fluid miscible dynamic variation.Get its minimum miscibility pressure through a fine tube experiments and numerical simulation results.Secondly,in the history matching process,simulate mainly reserves,average reservoir pressure,oil production,daily oil production,Nissan water,the cumulative oil production,cumulative water production and the water cut.Do the research of plane remaining oil distribution and longitudinal remaining oil distribution of the 0+1 sand group and 2 sand group.According to the simulation results,find that 1 sand mining group has a low level of recovery and its remaining oil is rich.So it is very necessary to inject gas to enhance oil recovery.Thirdly,optimize the injection and production parameters to determine the injection and production strata.Consider gas injection and oil production capacity,horizontal injection and production wells have advantages compared to vertical wells or injection-production hybrid injection wells and about 400 meters will be the proper injector Spacing.Due to a current overall pressure sand formations around 42 MPa,no high injection-production ratio is needed.On the one hand,DH1C? has high residual oil saturation.On the other hand,the low GOR of oil production capacity will not be reduced,so the production rate will be 2%-3%.Finally,do Scheme of the study area.According Laboratory tests results and numerical simulation results,design three comparison programs and predict the development indicators.Consider geological and reservoir engineering studies,combined with the economic evaluation,the most proper program will be selected.