Research Of Strong Heterogenity Reservoir Injection-Production Adjustment Based On Interwell Connectivity

Acorrding to the classification of many oilfield,multilayer strong heterogeneity reservoir is defined as a certain kind of sandstone reservoir with heavily heterogeneous and inequilibrium displacement feature.While it exists widely in many oilfield,a specific technic is eagerly demand.It aims to give a rapid and reasonable method to optimize injection-production parameters in strong heterogeneity reservoir.The priority of this method is to figure out the explicit distribution of injected water,and it’s a difficult task to realize in strong heterogeneity reservoir without numerical simulation.So we introduce ML-CRM model(Multilayer Cpaitance Resistance model)to calculate interwell connectivity in multilayer reservoir,and then we consider it as the parameter to represent split coefficient of injected water.Basing on the ML-CRM model,we now get the injection split coefficient in multilayer reservoir with insufficient injection-production profile data.Combining with waterflood control area calculation method,we could get the actual waterflood performance of each injection-production unit,and the water saturation distribution in strong heterogeneity reservoir.Finally,the water saturation can be a key parameter to indicate equilibrium displacement,and we consider it as one of many reservoir characterization to define the optimal development and adjustment parameter.Thus,we could draw injection-production adjustment standerd diagram of strong heterogeneity reservoir.The result shows that,Interwell connectivity actually represent the injected water distribution in each layer and each control unit.It’s not only related to permeability and thickness,but also associated with well distance,fluid property,displacement pressure drop and water saturation.So the interwell connectivity can be utilized to indicate injected water distribution.According to practical well group model application,this method shows a strong adaption and rubust to practical model.