Optimization Of Well Pattern Infilling Scheme In SN21 Well Area Of Luliang Oilfield

The low permeability reservoir in SN21 well area in Luliang oilfield has the characteristics of strong heterogeneity and complex oil and water law of motion,which causes the unbalance of injection and production in the current development.In this paper,the methods of layer Mining and well pattern infilling are used to solve those problem,at the same time we demonstrate and optimize the development plan.Firstly,based on the reservoir characteristics and production history analysis,the current development characteristics of the reservoir are studied by the combination of dynamic and static method,and the evaluation of the infilling effect is carried out.It shows that the main controlling factors affecting the infilling effect are sedimentary microfacies,formation rhythm and heterogeneity.And then the method of improving the production profile model is built with the improvement coefficient.Through a comparison with three methods result of split the small layers of single well,block production and oil production in the M2 and M3 area,such as the KH method,the liquid production profile model method and the liquid production profile model improvement method,the results showed that the improved method of the liquid production profile model is closest to the test results.Finally,considered the influence of the sedimentary microfacies,heterogeneity,effective thickness,remaining oil saturation,remaining oil recoverable reserves and economic limits,establish a standard for optimizing the infilling area.Deployed a layer mining well pattern in the infilling area.From the simulation results shows that the infilling scheme is workable.The method that build a layer mining well pattern in the infilling area used to solve the reserves producing degree unevenly in this paper,has a certain reference and guiding significance to development in the low permeability reservoir.