Technical Countermeasures For Stable Production Of Edge And Bottom Water Reservoir

L257 well area,which belongs to Ordos Basin,is a typical reservoir with edge and bottom water.It has been developed for several years since it was put into production in 2012,although the overall development situation is stable,however,there are still some problems such as rapid increase of water content,rapid decrease of reservoir production,no obvious effect after water injection,easy to see water and rapid decrease of pressure.In this paper,the geological characteristics and development status of the reservoir are studied,the development performance of the reservoir and the rising law of water cut are analyzed,and the source of water breakthrough in well area is analyzed,the main causes of water breakthrough in the study area are the coning and pushing of edge and bottom water and the influence of engineering factors The reservoir engineering demonstration of L257 well area is carried out by means of field statistics and numerical simulation,including reasonable production rate,reasonable injection-production ratio,reasonable flow pressure,reasonable pressure keeping level and reasonable production in bottom water development area.According to the reservoir numerical simulation technology,the distribution of the remaining oil in the reservoir is studied,and finally a set of research scheme for the reservoir stable production is formed,which includes: adjusting the Rhombus reverse nine-point well pattern for the drainage water injection,the treatment of low-production wells and high-water-cut wells,the results are expected to add 105,000 tons of oil.Through the study on the well area of L257 reservoir with edge and bottom water,the theoretical support is provided for the adjustment of the development strategy of the reservoir,and the theoretical foundation for the study of stable production countermeasures of the same kind of reservoir is laid.