Studay On Rational Development Technology And Policy Of Extra-low Permeability Reservoir In Luo228 Area

Chang8 reservoir in Luo228 well area of jiyuan oilfield is located in the middle and west of ordos basin,which is characterized by low porosity,ultra-low permeability,low pressure and low abundance.In 2013,synchronous water injection development was adopted to put into operation.After a period of production,the reservoir showed such problems as low formation pressure,large production decline rate and rapid rise of water content.In order to solve this problem comprehensively,based on the in-depth analysis of the geological characteristics of Luo228 area,this paper comprehensively USES the reservoir engineering method and numerical simulation method to study the water flooding law and fine injection and production regulation technology of Chang8 reservoir in jiyuan oilfield.According to the analysis,the area is affected by reservoir physical property,reservoir sensitivity and compatibility between injected water and formation.Due to the influence of micro-fractures,high permeability zones,interlayer heterogeneity and interlayer separation,the reservoir water flooding is uneven,and some oil Wells enter the high water cut period.Based on the results of reservoir dynamic analysis,the rational development parameters of different parts of the research area are determined by using reservoir engineering method and numerical simulation method,and the current development parameters are evaluated.In order to solve the problem of water utilization rate of injection caused by general water injection in reservoir,8 Wells were changed to stratified water injection,and the standard of stratified water injection for Chang8 reservoir in Luo228 well area was proposed.Aiming at the problem of incongruity between injection and production,14 holes in oil well are put forward.In view of the development well group whose water cut increases rapidly due to the formation of channeling flow under the influence of reservoir characteristics,nine oil Wells were converted into water.To solve the problem that formation pressure is kept low due to underinjection,28 Wells are proposed to increase injection.Through the above adjustment and potential development measures,the oil production in the research area can be increased by 63,000 cubic meters after 20 years of numerical simulation.The research results will be used to guide the efficient development of Luo228 area,realize the long-term stable production and improve the oil recovery.