高饱和油藏注水改善开发效果对策研究

Countermeasures for improving development effect of high-saturated reservoir by waterflood

高饱和油藏具有高饱和压力、高气油比的特点,注水开发保持地层压力高于饱和压力是改善开发效果的重要保证。以高邮凹陷投入开发的3个高饱和油藏为例,阐述了研究区域内高饱和油藏的开发地质特征,对比了油藏开发效果,总结了影响油藏注水开发效果的主要因素。准确认识油藏构造和储层特征,是注水开发高饱和油藏的前提和基础;合理把握注水时机,保持油藏合理压力水平,是开发高饱和油藏的关键;不断提高注采井网的适应性,是巩固改善高饱和油藏注水效果的保证;适时采用针对性工艺措施,可巩固改善高饱和油藏注水开发效果,从而明确了下一步巩固改善油藏注水开发效果的调整思路及对策。

High-saturated reservoir is characterized by high saturation pressure and high GOR. The important guarantee of improving developmemt effect is to keep the formation pressure to be higher than the saturation pressure. Taking three high-saturated reservoirs in Gaoyou Basin as examples, this paper summarizes the development geologic features in study area, analyzes and contrasts the reservoir development effect. It draws conclusions that the reservoir development effect by waterflood can be influenced by some main factors. Recognizing exactly the reservoir structure and features is principal and fundamental for waterflood development. Seizing rationally flooding opportunity and keeping rightful reservoir pressure level are crucial. Promoting constantly the adaptability of flooding pattern is the guarantee of improving and consolidating flooding effect. Taking the suitable technologic measures can improve the development effect, which can be confirmed in the next development by adjusting thoughts and countermeasures.