Research On Well Pattern Optimization Of Xing-6 Eastern District In Daqing Oilfield

Delta plain facies and delta front facies are two mainly sedimentary facies of the Eastern Xing-6 district of Daqing oilfield,since there are many sedimentary units with different physical properties,so that the problem of plane and interlayer heterogeneity is extremely serious.In the process of water flooding,the sedimentary units with poor physical properties have not been used or have low utilization degree and poor utilization effect,which results in better initial development effect but poor later.In view of the above problems,this paper studies the geological characteristics of the target block,establishes the actual geological model of the target block and the actual numerical model of the main area by numerical simulation method,divides the combined layer system by the boundary models of permeability range,effective thickness of single well and the number of small layers in the series according to the characteristics of the multi-thin layer of the block,and deduces the limit well spacing calculation formula of heterogeneous reservoir based on the theory of seepage mechanics.Finally,based on the study of well pattern adaptability,the method of numerical simulation,combined with the results of stratigraphic division and limit well spacing,optimizes the well pattern parameters of the block.The research shows that the reservoirs in the target block can be divided into three strata,the limit well spacing of strata I is 368 m,the limit well spacing of strata II is 261 m,and the limit well spacing of strata III is 119 M.The optimum well pattern type of formation I is inverse nine-point pattern,and the optimum well spacing ratio is 1.5;the optimum well pattern type of formation II is inverse seven-point pattern,and the optimum well spacing ratio is 1;the optimum well pattern type of formation III is five-point pattern,and the optimum well spacing ratio is 1.