A New Production Splitting Method Based on Discrimination of Injection-Production Relation

Abstract

The complex mature oilfields in China have been operated for a long history. During their exploration and development, a large amount of diverse production and research data with complicated formats were generated. The gradual penetration of geology research requires more precise reservoir analysis and research. Accordingly, it is urgent to make reservoir performance fine analysis for these mature oilfields using efficient and innovative data processing technologies. In this paper, multi-layer water flooding reservoirs were discussed with multi-disciplinary data. Through automatic discrimination of injection-production relation by computer, vertical and horizontal water flow rates were analyzed quantitatively to diagnose the directions and layers of dominant water flow. Then, the productions of production well and water injection well were split by layers to clarify how the water injection affects the performance of production well. Compared with conventional methods, the proposed new method is more comprehensive and reasonable in application of data and more scientific and accurate in reservoir performance fine analysis. The software developed on this method has been applied in hundreds of reservoir blocks in Daqing, Jidong, Jilin, Liaohe, Xinjiang and other oilfields. It is of significant guidance for evaluation on remaining oil potential and preparation of development adjustment plan for mature oil-fields.