Research On Comprehensive Adjustment Technologies For Kongdian Formation Of A Fault Block In Weibei Oilfield

Complex fault block reservoirs all have pretty intricate structure,thus their remaining oil distribution is more dispersed than that of others and the potential tapping is difficult.At present because of the fault and stronger heterogeneity characteristics make this kind of reservoir mining is difficult,but still has large tapping potential.Therefore,to study how to efficiently develop such kind of reservoir is particularly important.In this paper,with a particular block of geological data,dynamic characteristics,based on the research of this kind of reservoir remaining oil,we put forward oil field comprehensive adjustment measures by profile control,well pattern adjustment,reperforating lost sealing and so on.Aiming at the main problems during the development of A fault block,starting from the study of the whole reservoir,this paper summarized the development characteristics of A fault block and evaluated the development effects;The distribution regularities of residual oil were summarized and the predominant pathway between oil and water wells was judged by reservoir engineering and numerical simulation;The profile control management to the block was carried out;The potential of the formation hierarchies was analyzed according to their partition and corresponding relation,the well pattern and the relation between injection and production formation hierarchies was adjusted based on the distribution characteristics of remaining oil,and the perforation and plugging measures was determined;the injection and production dynamic was analyzed and the balance between them was adjusted according to their corresponding relation;Through measures to optimize decision-making,put forward reasonable solution and optimization,meet the needs of oilfield efficient development.This paper summarizes the problems during the development of A fault block:Formation voidage,interlayer interference,high permeability layer water flooded.Determined block water flooding recovery was 27.03%;The layer of K₂Z₂³ and K₂Z₃² were next tapping direction;Determining the target block reasonable well spacing density 14.6well/km²;Injection-production ratio is 1.0;Liquid production rate is 3.0%;Reasonable injection-production well ratio is 0.53.Through the feasibility analysis of perforations and plugging,well adjusted and profile,find out two kinds of the best potential tapping program,on the basis of the current development improve the degree of recovery 3.21%、2.88%.