The Research Of Well Pattern Optimization In Ying 72 ES3 Low Permeability Reservoir

The Ying72ES3 reservoir of Dongxin oilfield is a typical low permeability,it was put into development in 1964.It has experienced four big adjustment,and achieved initial results.After many years of development,the many problems expose in the reservoir.It has three big problems during development.First,heterogeneity of continental is serious to in oilfield,the exploration of oil reserves is unbalanced in plant and vertically by structure,oil-bearing area,reservoir property and injection-production well spacing.Second,with large well spacing as well as low production speed and oil recovery.The present well pattern hardly meets the requirements of effective development.Third,as a result of the long-term oil development by natural energy,has been an rapid decrease in formation energy and oil production.The paper analyzes layer adaptability of well network,energy,water flooding and reserveing are evaluated of Ying 72 ES3,basing on the comprehensive study of structure,reservoir properties,fluid properties on geological characteristics.And the simulation of the flooding conditions,the distribution of residual oil are analyzed by using the method of reservoir engineering and numerical simulation.The well pattern compatibility is studied with view of Ying 72ES3 deposit characteristics,appraising the development effect and compatibility of the present well pattern,getting the reasonable well pattern density,interspacing,spread length,the well pattern form and the well placement principle.Finally,the view of reservoir is complex,poor physical property,low productivity characteristics,and it put forward reasonable economic injection production mode,which is forms the area of pattern matching and then staggered well network and supporting the vertical well fracturing,synchronous adjustment scheme of water injection,improving the development effect and raising recovery rate.