Dynamic Analysis Of Water Injection Development Under Fine Single Sand Body Characterization In X Reservoir

Since water injection and development,due to many factors such as strong reservoir heterogeneity and micro-fracture development,X reservoir has caused the following problems:it is difficult to establish effective pressure displacement system;the reservoir's pressure distribution is uneven;there are large differences in oil well effects.There are many water breakthrough wells in the north,whose water breakthrough direction is not clear.Therefore,many measures are invalid,and it is very difficult to treat.In this case,there is an urgent need to carry out characterization research on fine single sand body as well as the dynamic analysis on reservoir dynamic,put forward treatment plans,and improve the development level of X reservoir so as to guide the stable production development of Huaqing ultra-low permeability reservoir.Aiming at the existing problems in X reservoir at present,this thesis introduces the flow unit on the basis of geological research,combines the single sand body to identify the response characteristics,establishes the superposition relation pattern of single sand body,and develops the fine characterization on single sand body.According to the analysis on the development data over the years,it evaluates the development effect of water flooding by the characteristic research on capacity change,pressure change,water-cut change,and water flooding change.Based on the characterization of the fine single sand body,it analyzes the causes of water-cut rise or water flooding in high water-cut wells in the study area in combination with the response and water breakthrough laws,puts forward some suggestions for the measures of oil-producing wells and water-injection wells,and provides theoretical basis for the efficient development of X reservoirs.Through the analysis of this paper,we obtain as follows: the vertical overlapping relationship of the sand body is mainly in overlapping style,separating style,and overlapping style;the lateral contact relationship is mainly in isolated style,docking style,and side-cutting style.The ratio of width to thickness of the micro-phase single sand body in the turbidity channel is 40 to 120,and the ratio of the width to thickness of the micro-phase single sand body at the flank of the turbidity channel is 54 to 108.The single sand body is mainlydistributed in the northeast-southwest direction,which is superimposed on each other in the lateral direction.The number of single sand in the main horizon is from 15 to 22.According to the research findings of the single sand body,the dynamic analysis is carried out.Aiming at many problems in the study area,we propose the treatment plan through the following three aspects: adjusting the fine injection and production(plane),treating high water-cut wells(profile),and improving the degree of extraction(tapping potential).It is recommended to implement various measures for 194 wells,and deploy 14 new wells,which provide a strong guarantee for stable and increased production in the study area.