有效改善高凝油油藏注水开发效果——以辽河盆地大民屯凹陷沈95块为例

在不同温度下,高凝油具有不同的流动特点,给油田注水开发带来一系列困难,因此,通过实验室研究成果,并结合地质建模和油藏数值模拟一体化技术研究,分析在不同地表注水温度下油藏的温度场分布,确定温度60℃是一个重要的临界温度,高于此温度,原油呈牛顿流体状态,蜡晶不会析出,粘度降低。研究结果表明,以地表注水温度80℃为最优注水开发方式,并进一步对井间温度场分布和预测进行分析研究,这亦为改善高凝油油藏开发效果、提高采收率的优化方案设计提供指导依据。

A study on effectively improving waterflood development of oil reservoirs with high freezing point——an example from Shen25 block in the Damintun Sag,the Liaohe Basin

Oil with high freezing point is different in flowing properties at different temperatures,resulting in a series of difficulties in waterflood development of oilfields.To solve the problem,with experimental results and an integration of geological modeling and reservoir numerical simulation,we analyze the temperature field distribution in the reservoir at different surface temperatures of injected water.It is found that 60℃ is an important critical temperature.Over 60℃,the crude oil is a Newtonian fluid,with no wax crystallization and lower viscosity.The study results also show that the surface temperature of injected water at 80℃ is the best in waterflood development effects.Furthermore,the temperature field distribution among wells and its prediction were also analyzed,which provided guidance for the plan optimization of high freezing-point reservoirs in improving development and enhancing oil recovery.