一种新型纳米材料室内实验研究与现场应用

Laboratory research and field application of one novel nano material

纳米技术作为一种提高石油采收率的技术,与传统的EOR工艺中采用的气驱、水驱和化学驱相比,纳米颗粒显示出一些不同寻常的优势性能,如比表面增大效应、吸附效应及纳米速度滑移效应等,可以改善储层岩石的润湿性,流动阻力等效果,因此具有增强或替代常规低浓度盐水驱的发展潜力。海上油田在注水过程中,由于储层原始渗透率低、注入水质不达标、矿化度高等原因,普遍存在注入压力高、储层吸水指数低等问题。为了解决这些问题,常规解堵措施一般采用酸化解堵措施;但这些措施经过多轮次之后,储层可供溶蚀的岩石颗粒越来越少,常规解堵措施有效期则越来越短。因此文中研究了一种能改变润湿性形成疏水覆膜的新型纳米材料体系并进行了现场应用,试验结果表明纳米技术降压增注效果明显,注入压力下降77%,注水量提高了1.7倍。本文研究对部分中低渗储层注水困难、有效期短等问题具有较好的指导意义。

As a novel technology to enhance oil recovery,compared with gas flooding,water flooding and chemical flooding in traditional EOR process,nano technology show some unusual advantages,such as specific surface augmentation effect,adsorption effect and nano velocity slip effect,which can alter the wettability and weaken flow resistance of reservoir rocks.Therefore,it has the development potential to enhance or replace the conventional low concentration brine flooding.In the process of waterflooding in offshore oilfield,there are many problems,such as high injection pressure,low reservoir water absorption index and so on,due to the low original permeability,inferior injection water and high salinity.In order to solve these problems,conventional plugging removal measures generally adopt acidizing measures.However,after many times of these measures,there are less and less rock particles available for dissolution,and the effective period of acidizing measures is shorter and shorter.Therefore,a new nano material system which can change the wettability and form hydrophobic coating was studied and applied in the field.Test results show that the effect of reducing pressure and increasing injection is obvious,the injection pressure is reduced by 77%,and water rate is increased by 1.7 times.This study is of great guiding significance to solve the problems of difficult water injection and short effective period in some low permeability reservoirs.