Study On Differentiation Well Pattern Adaptive Strategy In Strong Heterogeneity Low Permeability Reservoir

Low permeability reservoirs is one of the most important types of reservoir in Shengli oilfield,which proven reserves and the producing geological reserves is very rich,turbidite sandstone low permeability reservoir with strong heterogeneity account for 38.5% of total reserve.At present,Xian He oil field turbidite sandstone low permeability reservoir is entering high water cut stage,which sand body are scattered distribution,accompany with strong heterogeneity,well pattern is inadaptability,also producing reserves is lower,it is necessary to study the actually block as an typical example,find some way to solve existing problems.By using reservoir engineering and numerical simulation approach,according to He148 strong heterogeneity turbidite sandstone low permeability geological characteristics,this paper conduct differentiation pattern adaptation research,optimize direction of different well patterns,reasonable well spacing,and optimization adaptation between hydraulic fracture and well pattern parameter.Finally,we present a set of suitable oilfield development scheme for He148 low permeability oil reservoirs.For the first step,to set up He148 reservoir geological model and numerical simulation model,we consider the plane distribution of different sedimentary facies,relationship between sand body and the vertical superimposed,reservoir heterogeneity characteristics.We study the remaining oil saturation distribution with respect to different geological characteristics;Differentiation well pattern adaptation part,combined with sand body geometry,size,different sedimentary facies belt and plane heterogeneity,vertical superimposed relationship,we optimize the well spacing respectively,which for the banded sand body,continuous distribution of sand body,shape of fan sand body.And also study the reasonable injection-production well spacing with respect to different permeability and thickness of sand body;Differentiation injection-production parameters,according to different reservoir article banded sand body,the continuous distribution of sand body,fan shape of sand body,we study the reasonable reservoir pressure maintains,reasonable fluid productivity level,reasonable injection-production pressure,and build up various types of sand body,the optimal injection-production parameters,in order to realize the balanced displacement of single sand body.The results could provide guidance for low permeability reservoir development at high water-cut stage(late time).