Research On Reasonable Injection And Production Parameters Of Water-drive Reservoir In X Area Of M Oilfield

With the continuous exploitation of oil resources on the land,the remaining recoverable reserves are very limited,and the further development of offshore oil fields is the key to solve the contradiction between supply and demand of oil in China.At present,the offshore waterflooding development oil field is generally faced with the problem of imperfect injection-production system and low level of reservoirs producing amount.In this paper,the X block in a offshore oilfield is taken as an example.According to the characteristics of offshore oilfield,we adopt various methods to study its reasonable injection and production parameters,this will provide theoretical guidance for the later stage adjustment of oilfield,it also can provide reliable reference experience for the same type of offshore oil fields.Based on the comprehensive analysis of the geological development characteristics of the study area,we have determined the reasonable evaluation index for the development effect.We have mainly selected three aspects,including the comprehensive water cut,the law of liquid-producing capacity and the recovery rate prediction.According to the latest seismic data,the study of structural characteristics,fine interpretation of faults and horizons,interpretation of the middle layer by the methods of spatial trend surface are carried out in the study area,it provides accurate model data for geological model.On this basis,a fine geological model is established,and the quality test of the coarse geological model is carried out to meet the precision requirement.The mathematical model of the study area have been established,and historical fitting of geological reserves and water content and cumulative oil production in whole area and single well have been carried out.Meanwhile,the distribution rules of remaining oil in each oil layer group and sedimentary microfacies are also studied,which will provide theoretical guidance for potential tapping in the later stage of reservoir.According to the reservoir characteristics of the study area to determine the implementation of separate layer water injection technology,the geological and development factors which affecting the water injection in the interval are studied,and the reasonable weights of each factor are determined,through the comprehensive evaluation,combined with the numerical simulation method to predict the effect of the development of separate layer water injection and injection scheme.The water injection of each layer is determined.The numerical simulation method is applied to compare the development effect of separate water injection and general water injection.Reservoir engineering and numerical simulation method were applied to optimize different formation pressure maintenance levels,water injection timing and injection production ratio,and determine the reasonable value.Using dynamic and static factors analysis method and numerical simulation method,the reasonable oil recovery rate in the study area is selected.The results show that the effect of water injection is better than that in general water injection,and the oil production and oil recovery are increased by 2.4735 million tons and2.28%.The level of formation pressure is 0.95 times higher than that of the original formationpressure,and the water injection timing is sixth months after development.The injection production ratio is 1.0,and the oil recovery rate is 1.6%,which has a good development effect.The research results have important guiding significance for the rational and efficient exploitation of the offshore oil fields,enhanced oil recovery and economic benefits.