Study On Optimization And Adjustment Of Well Pattern Of Narrow And Thin Sand Body In Fang M Block

In the development process of the Fang M block in the north of Daqing Oilfield,with the extension of the development time,the water content of the infill well increased rapidly,resulting in a poor development effect.In addition,some areas still have problems such as imperfect injection and production,and further study on optimization and adjustment of well patterns is needed.At the same time,due to the existence of a large number of narrow and thin sand bodies in the Fang M block and uneven distribution,the remaining oil is scattered,the development effect difference between different fault blocks is large,and the development period is long and other factors,it is necessary to carry out zone classification analysis on Fang M block,to carry out accurate evaluation of injection and production improvement,analysis of remaining oil distribution in narrow and thin sand bodies,and research on treatment measures.In this paper,the existing production materials in the research area are used,combined with reservoir structure and attribute characteristics,to carry out multi-parameter classification,and the Fang M block is divided into 15 different types of zones.Evaluation of single sand body and single well injection and production perfection by water flooding area coefficient method,and analyzed five types of dynamic and static indicators,through the gray correlation method,a comprehensive evaluation of the adaptability of the existing well pattern in each zone,summarize the preliminary adjustment measures of different types of blocks.Carried out research on remaining oil potential of narrow and thin sand bodies in typical blocks,mainly divided into two parts: research on remaining oil distribution characteristics and utilization status evaluation,use seismic,logging interpretation and logging data to establish a three-dimensional fine structural model,compare the model with seismic profiles,logging interpretation and production test results,modify the static parameters of the model to make it close to the real reservoir,quantitatively describe the spatial distribution and physical properties of each sand layer.According to the principle of overall development trend control and local adjustment of single well,the whole process history matching of production dynamics is realized.On this basis,quantitative description of remaining oil in sub-sand body and sub-sedimentary units is realized,and potential well layers for comprehensive treatment are clarified.In terms of utilization status evaluation,comprehensive analysis of water-flooded layers,influencing factors of remaining oil,profile of water absorption and fluid production and analysis of pressure distribution are carried out.And use the data of water absorption and liquid production profile,formation pressure and other data,combined with the numerical simulation calculation results,analyze the recovery degree and recoverable reserves of each sedimentary unit,and comprehensively evaluate the oil layer utilization status of each deposition unit.Finally,based on the evaluation of the adaptability of the well pattern in each zone and the results of the remaining oil potential research,the research on the optimization and adjustment measures of the narrow sand body well pattern classification,combined with the main problems and the development of the oil layer,it was found that the deployment of infill wells and transfer injection wells has the best development effect on the thin and thin sand bodies of Fang M block,and the best adjustment measures are selected and the production capacity forecast is made.