纳米降黏驱油体系的制备及性能评价
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1.油气钻采工程湖北省重点实验室长江大学;2.中海油田服务股份有限公司;3.中海石油(中国)有限公司海南分公司

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国家自然科学“热敏聚合物纳米流体高温触变机制研究”(编号:52074038)资助;


Preparation and Performance Evaluation of Nano Viscosity Reduction Oil Displacement System
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Hubei Key Laboratory of Oil and Gas Drilling and Production Engineering Yangtze University

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    摘要:

    乳化降黏是稠油提高采收率的关键技术之一,由于普通降黏剂无法同时满足特稠油热采时的高温与高矿化度要求,导致降黏剂失活、降黏效果差、采收率低。本文通过室内实验制备纳米降黏驱油体系,并表征了纳米材料的微观结构,评价了体系对特稠油的降黏效果以及耐温、耐盐性能、对岩石的铺展作用、吸附损失以及驱油效率。体系配方组成为:50%SiO2+40%分散剂EB-1+4.2%表面修饰剂2+5.8%增效剂ZX。实验结果表明:1%浓度的纳米降黏驱油体系对特稠油的降黏效果可达84.99%,在温度350℃、矿化度15000mg/L的条件下老化2h后降黏性能保持率为99.27%;体系可使储层岩石表面发生润湿反转;当液固比为10∶1时,体系的静态吸附量为1.328mg/g砂,动态吸附量为0.745mg/g砂,小于标准吸附量2mg,在油藏中的吸附损失较低;通过一维驱替实验,体系对比普通蒸汽驱驱油效率提高了26.7%。纳米降黏驱油体系的研究可以有效的提高特稠油的热采开发效果。

    Abstract:

    Emulsification and viscosity reduction is one of the key techniques for enhancing the recovery efficiency of heavy oil. Due to the inability of conventional viscosity reducers to meet the high temperature and high salinity requirements during thermal recovery of highly viscous oil, issues such as viscosity reducer deactivation, poor viscosity reduction performance, and low recovery rates often arise. This study focuses on the preparation of a nano viscosity-reducing oil displacement system through laboratory experiments, characterizing the microstructure of the nano materials. The study evaluates the viscosity reduction effect on highly viscous oil, as well as the system"s temperature resistance, salt resistance, rock spreading effect, adsorption loss, and oil displacement efficiency.The composition of the system formula is as follows: 50% SiO2 + 40% dispersant EB-1 + 4.2% surfactant 2 + 5.8% synergist ZX. Experimental results indicate that the 1% concentration nano viscosity-reducing oil displacement system achieves a viscosity reduction effect of 84.99% on highly viscous oil. After aging for 2 hours at a temperature of 350°C and a salinity of 15000 mg/L, the viscosity reduction performance retention rate remains at 99.27%. The system causes a wetting reversal on the reservoir rock surface. At a liquid-solid ratio of 10:1, the static adsorption capacity of the system is 1.328 mg/g of sand, and the dynamic adsorption capacity is 0.745 mg/g of sand, both lower than the standard adsorption capacity of 2 mg, resulting in low adsorption losses in the reservoir. Through one-dimensional displacement experiments, the system exhibits a 26.7% improvement in oil displacement efficiency compared to conventional steam flooding.The study of the nano viscosity-reducing oil displacement system can effectively enhance the thermal recovery efficiency of highly viscous oil.

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  • 收稿日期: 2023-08-30
  • 最后修改日期: 2023-09-19
  • 录用日期: 2023-11-02
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