海上油田注水井复合纳米降压增注技术研究

发布时间：2017-12-28 18:22

本文关键词：海上油田注水井复合纳米降压增注技术研究　出处：《海洋石油》2016年04期 　论文类型：期刊论文

【摘要】：为解决海上油田注水井压力升高过快,欠注现象严重的问题,在室内复配了一种适合于海上油田注水井的复合纳米降压增注物料体系。进而评价了该体系的稳定性、界面活性、防膨性能、改变岩石润湿性能以及降低微粒运移伤害能力,还通过岩心驱替实验评价了其降压增注效果。结果表明,该复合纳米降压增注体系具有良好的稳定性和界面性能,在储层温度下放置50 d后界面张力仍然可以稳定在10-2 m N/m的数量级。体系对岩心粉末的防膨率可以达到96.7%,并且可以有效改变岩石表面润湿性。使用该复合纳米降压增注物料处理后的驱替液颗粒总数以及粒径中值都明显降低,说明其具有较好的降低微粒运移堵塞的可能性。岩心驱替实验结果表明,经增注措施处理以后压力降低率均可以达到35%以上,可见复合纳米降压增注物料体系具有明显的减阻效果,能够满足海上油田注水井长期降压增注的需要。
[Abstract]:In order to solve the problem of high pressure and short injection phenomenon in offshore oilfield, a compound nano pressure increasing injection material system suitable for offshore oilfield water injection well is built. The stability, interfacial activity, anti swelling property, wettability and particle migration damage ability of the system were evaluated, and the effect of depressurization and injection was evaluated through core displacement experiment. The results show that the composite nanodepressurization and injection system has good stability and interface performance. After placing 50 d at the reservoir temperature, the interfacial tension can still stabilize at the order of 10-2 m N/m. The anti swelling rate of the core powder can be 96.7%, and the wettability of the rock surface can be effectively changed. The total particle number and particle size value of the displacement liquid treated by the composite nano depressurization and augmented injection material were significantly decreased, indicating that it has a good potential to reduce particle migration and blockage. Core displacement experiment results show that after the injection treatment, the pressure reduction rate can reach more than 35%. Therefore, the composite nano depressurization and injection material system has obvious drag reduction effect, which can meet the need of long-term injection and water injection in offshore oilfield.
【作者单位】：长江大学化学与环境工程学院;荆州市汉科新技术研究所;
【分类号】：TE357.6
【正文快照】： 海上某油田注水井在注水过程中由于注入水水质较差、储层敏感性等原因,导致大多数注水井注水压力上升过快,普遍存在注水困难的现象[1]。分析海上油田注水井储层特征以及注入水水质等因素,找出注水井压力升高以及欠注的主要原因。储层黏土矿物质量分数平均为18.5%~22.6%,成份多

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