坪北油田中高含水期合理注采比确定

Determination of Reasonable Injection-Production Ratio in the Phase of High Water Cut in Pingbei Oilfield

注采比可反映油田产液量、注水量和地层压力三者之间的关系,是研究注水开发油田地层压力的重要依据。制定合理的注采比对于稳定原油生产、控制含水上升、实现油田高效开发具有重要的意义。应用油藏工程方法中水驱特征曲线法和Logistic模型法,理论推导注采比与综合含水之间的关系式,确定坪北油田中高含水期合理注采比。计算结果表明,现阶段坪北油田注采比应保持在2.28左右较为合理,该项研究结果可指导油田合理配注及注水调整。

The injection-production ratio can reflect the relationship between fluid production, water injection and formation pressure,and is an important basis for studying formation pressure in waterflooding development.It is of significance to establish the reasonable injection-production ratio to stabilize crude oil production,control the rise of water cut and realize the effective development of an oil field.The relationship between injection-production ratio and water-cut is derived theoretically by using the water-drive characteristic curve and the LOGISTIC model in the reservoir engineering method to determine the reasonable injection-production ratio in the middle and high water-cut phase of Pingbei Oilfield.The calculation results show that the injection-production ratio of Pingbei oilfield should be kept at about 2.28 at present.