大庆油田中区西部合理注采比的确定

Study of the Reasonable Injection-Production Ratio in the West Part of Central Block in Saertu of Daqing Oilfield

注采比是研究注水开发油田压力系统的重要依据。合理的注采比对于油田的产液量、注水量与地层压力之间的联系具有十分重要的意义。注采比是否合理也关系到油田的稳定生产和经济效益。针对特高含水后期合理注采比的确定,给出了物质平衡法和水驱特征曲线法,考虑实际地层压力状况,通过建立注采比与产液量、含水率等之间的关系,确定了中西部地层的合理注采比。结果表明,注采比保持在0.99~1.02范围内才能使注采压力系统在高水开发期内保持动态平衡,对大庆油田后期注水开发具有重要的指导意义。

The injection-production ratio is an important basis for studying the pressure system of water injection development oilfield. Determining the reasonable ratio of injection to production is of great significance for the relationship between the amount of liquid produced in the oil field, the amount of water injected and the pressure of the formation. Whether the injection-production ratio is reasonable or not is also related to the stable production and economic benefits of the oilfield. There are few studies concerning the determination of reasonable injection-production ratio in the ultra-high water cut stage. The material balance method and water flooding characteristic curve method are presented in this paper. Considering the actual formation pressure condition, the relationship between injection-production ratio, liquid production volume and water content is established to determine the reasonable injection-production ratio of the stratum in central and western regions. The results show that the injection-production ratio is maintained in the range of 0.99~1.02, so that the injection-production pressure system can maintain dynamic balance during the high-water development period, which is of important guiding significance for the later water injection development of Daqing Oilfield.