Research On Asynchronous Air Injection Drive Adjustment In Block L

The L block is a major discovery of the exploration development of Qinghai Oilfield in the past 30 years.Due to the heterogeneity of the reservoir,the range of water injection sweep area during the water drive is unequal.At present,the oil field has entered a high water cut period.In this paper,the geological conditions of the L block are summarized,and the reservoir of each small layer of the study block are evaluated and the fluid properties in the reservoir are analyzed.It is found that the L block is located on the Qie 6 and Qie 12 structures in the western part of the Kunbei fault zone.The oil-bearing horizon of the L block mainly develops a braided river delta sedimentary system.The L Block’s saturation pressure and dissolved gas to oil ratio are low,belonging to nonsaturated reservoir.After that,the current status of exploitation for the L block was carried out,and it was found that the degree of reserve recovery for the block L was only 3.02%.The vertical consumption of remaining oil in this block is extremely uneven,and most of the crude oil still exists in the underground,which needs to be tapped.When carrying out the research on the asynchronous air injection drive in the L block,the indoor physical model experiment was first carried out.The experiment was divided into two groups,sand packed model experiment and slender tube experiment.The two sets of experiments analyzed the effects of reservoir temperature,injection pressure and gas injection volume on the oil remaining distribution of the air drive,as well as the influence of reservoir temperature,gas injection pressure and oxygen concentration in the injected gas on the air drive efficiency.Then,through the numerical simulation method,the research on asynchronous air injection drive is carried out for the L block,and the asynchronous air injection drive is compared with depletion drive exploitation,water drive,continuous air drive,and cyclic air injection drive,and the asynchronous air injection drive effect is found.the best.Then,for the research block,find the approximate range of reservoir permeability,net pay thickness,original reservoir temperature,oil saturation,crude oil viscosity and reservoir angel suitable for asynchronous air injection drive,and compare it with the research block.It is found that the research block is suitable for asynchronous air injection drive.After that,the law for the operational parameter of the asynchronous air injection drive are researched,and the development plan of the asynchronous air injection drive for the research block is given.