丘陵油田纳米聚硅增注技术研究与实践

THE RESEARCH AND PRACTICE OF LNJECTION-INCREASEL TECHNOLOGY OF NANOMETER POLYSILICON IN XINJIANG QIULING OILFIELD

针对丘陵油田在注水开发过程中存在注水井注入压力长期居高不下、注水量低的问题,提出通过注入一种纳米聚硅溶液以缓解这一问题。纳米聚硅材料具有极强的憎水亲油能力及与岩石的吸附能力,其溶液注入地层后优先吸附在孔隙内表面,改变了岩石的润湿性,提高了水相渗透率,从而达到降压增注目的。通过室内驱替模拟试验及现场应用表明,纳米聚硅增注技术可以降低该油田注水井的注水压力,提高油藏的吸水能力。

Qiuling Oilfield is an oilfield with low porosity and low permeability.It universally exists that the injected pressure is high in a long time and the injected water volume is low during the oilfield development.A kind of nanometer polysilicon solution screened can solve the problem.The nanometer polysilicon is provided with significant water resistant and oil-wet power which can produce physical absorptive action at the surface of sandstone grain and increase water phase permeability.The results of all above can reduce flow resistance of injection water and reduce pressure and increase water injection.The core-flooding experiment and the field application indicate that the injection-increase technology can strengthen the water absorbing capacity,increase water injection quality and improve the water injection development effect.