复合碳量子点降压增注体系的构筑及性能
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1.西安石油大学化学化工学院;2.陕西华油研创科技有限公司 陕西 陕西 西安

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碳纳米流体的构建及其驱油应用研究2021JQ-585,


Construction and properties of compound carbon quantum dotdepressurization and injection system
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College of Chemistry and Chemical Engineering,Xi’an Shiyou University,Xi’an

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    摘要:

    目的 针对低渗透油藏注水压力大的问题,利用碳量子点尺寸小、比表面积大的特性,开展了复合碳量子点降压增注体系研究。方法 用聚磺酸表面活性剂APS和两亲型碳量子点ACQDs构成了复合降压增注体系。通过界面张力测定、毛细管力渗吸高度测量、接触角测试、静态洗油以及岩心驱替实验对降压增注体系进行了多方面评价。结果 结果表明:质量浓度为1000 mg/L的APS/ACQDs复合降压增注体系可使油水界面张力降低至3.861×10-2 mN/m,毛细管力渗吸高度达到24 mm,岩心接触角减小到52°,静态洗油效率为77.89%。结论 岩心驱替实验表明,注入复合体系1PV后,降压率最高达到23.81%,较单一体系有明显提升,达到了降低注水压力的目的,为低渗透油藏降压增注技术的发展提供新的借鉴与参考。

    Abstract:

    Objective In order to solve the problem of high water injection pressure in low permeability reservoir, taking advantage of the small size and large specific surface area of carbon quantum dots, the compound carbon quantum dots were studied. Methods Polysulfonic acid surfactant APS and amphiphilic carbon quantum dots ACQDs were used to construct a compound injection system. The interfacial tension measurement, capillary imbibition height measurement, contact Angle measurement, static oil washing and core displacement experiments are used to evaluate the pressure reduction and injection system. Results The results show that the APS/ACQDs composite pressure reducing injection system with a mass concentration of 1000 mg/L can reduce the interfacial tension of oil and water to 3.861×10-2 mN/m, the capillary imbibition height can reach 24 mm, the core contact Angle can be reduced to 52°, and the static oil washing efficiency is 77.89%. Conclusion The core displacement experiment shows that after 1PV injection of the composite system, the maximum pressure reduction rate is 23.81%, which is significantly higher than that of the single system, achieving the purpose of reducing the water injection pressure, and providing a new reference for the development of low permeability reservoir pressure reduction and injection technology.

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  • 收稿日期: 2024-10-22
  • 最后修改日期: 2024-11-05
  • 录用日期: 2024-12-15
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