Study On Recombination Limit Of Strata And Adjustment Effect Evaluation For P Long-span Thin Interbeds Oilfield

With regard to those long-span thin interbeds offshore oilfields adopting the multilayer commingled production development pattern,a series of defects would expose gradually with the improvement of development degree.Consequently,adjustment of strata has become an effective measure to reduce interlayer interference and improve recovery efficiency.Based on geological and development characteristics of the reservoir,quantitative study of recombination limit of strata and the evaluation of development effect after recombination are of great significance for the efficient development of reservoir.According to the current development situation and existing problems of P oilfield,this paper has accomplished the following work and obtained the corresponding results:(1)Considering the influence of economic factor,this paper makes a quantitative study on the recombination limit standard of thin interbeds reservoir in different development stages.In addition,correction charts and method for the influence of factors such as development stage,degree of vertical dispersion and heterogeneity on the limit standard of recombination thickness are established.(2)Using the established recombination method of strata,four plans that meet the requirements are designed.The numerical simulation is used to predict the effect of each plan.The results of prediction verify that the recombination method established in this paper is reliable.(3)According to the current industry standard,the research proposes the classification key indexes for evaluating the adjustment effect of long-span thin interbeds reservoir(a primary core index,13 secondary effect key indexes)and the calculation method of each index.(4)A new idea of adjustment effect evaluation is proposed by analyzing the relationship between the indexes,and a normalized index standard suitable for different reservoirs and any development stage is proposed according to the normalization idea.(5)A quantitative comprehensive evaluation method for adjustment effect of long-span thin interbeds reservoir is established by using the improved radar chart method,and the adjustment effect of typical area is comprehensively evaluated,which provides theoretical and technical support for determining the direction of next adjustment measures for reservoir.