The Research Of Reservoir Connectivity In Yan 67 Block Of Ji Yuan Oilfield

Yan 67 block is located in the the middle of the northern Shaanxi of ordos basin-Ji Yuan oilfield. The Chang 8 reservoir which was put into production in May 2012, adopted measures of the advanced water injection.But it is no obvious signs of effective after improving strength injection becausing of rapid production decline in initial production. There has been high pressure –lack of injection problems with injection pressure rising during the development process. In order to develop a reasonable and stable water injection program, it must be studied reservoir characteristics and connectivity between wells.Firstly, by core analysis and logging data, combined with previous research results, long 8 reservoir small layer has been divided, and microfacies, reservoir characteristics and heterogeneity were studied. Combined with perforating data, reservoir connectivity grid-like figure, the degree of water flooding control, connectivity drag coefficient, it was studied Static connectivity between injection and production wells of the Chang 8 Reservoir, conducted a qualitative and quantitative description. By dynamic data, taking advantage of two methods of the inversion connectivity, which calculates the coefficient of connectivity between injection and production wells, analysis and compares the connectivity coefficient derived by two methods. It has been normalized, described quantitatively the degree of dynamic connectivity of injection and production wells by dynamic connectivity coefficient, analyzed the connectivity factors between wells and improvement measures. On the basis of the connectivity between wells research, combined with the production of dynamic curve, with well group as a unit, conducted a fine description of the relationship between injection and production, it made specific recommendations and measures.Through systematic study, it obtained the recognitions. Its static connectivity is better, but the overall dynamic connectivity is poor, which is mainly due to poor reservoir properties and formation plugging itself. It is obvious the main factors contributing to effective water-water pressure increasing: reservoir connectivity is poor, injection imperfect and uneven absorption profile by reservoir heterogeneity.