高温灰岩储层新型微乳盐酸体系构筑及性能研究
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1.中国石油勘探开发研究院;2.中国地质大学(武汉)

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TE 357

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中国石油“十四五”重大科技攻关项目“海外油田开发关键技术研究”,课题编号2021DJ3203


Preparation of a novel acid microemulsion for high temperature limestone reservoir and comprehensive evaluation of its properties
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    摘要:

    微乳酸作为一种应用前景光明的酸液体系,近年来得到了业界的广泛关注。但高温储层中较差的稳定性影响了其推广应用。本项目构筑了由微乳化剂SMT-3与助乳化剂SRA-5组成的微乳酸体系,同时研究了体系的静态特性及在储层中的流动特性。结果表明,该体系平均粒径为30nm,在100℃下保持10小时澄清透明,抗Ca2+浓度达到20%;在170s-1下剪切2小时依然稳定,具备较高的抗剪切性;由于酸相被油相紧密包裹,其对N80钢片的腐蚀性和对灰岩的溶蚀性都显著低于同浓度盐酸与稠化酸;体系在100℃下酸岩反应速率速率仅为盐酸的1/30,因此具备优良的深部穿透性;岩心流动实验表明该体系可以使渗透率提升至酸化前的500%,且储层伤害性低,是一种较理想的高温灰岩储层深部酸化工作液。图5表1参15

    Abstract:

    In recent years, the acid microemulsion has attracted significant attention from the petroleum industry due to its great potential for formation modification. However, the acid microemulsion will become unstable under high formation temperature, which hampers its wide application for deep reservoirs. In this work, an emulsifying formula mainly composed of SMT-3 and SRA-5 was screened through orthogonal experiments and its static and dynamic properties were thoroughly investigated. It was found that the developed acid microemulsion, which showed an average particle size of 30nm, could remain stable at 100℃ for at least 10 hours. It was also able to withstand the Ca2+ as high as 20%. It remained clear and transparent under the shearing rate of 170s-1 for 2 hours, demonstrating its outstanding capacity to resist the shearing force. As the acid droplets were well separated by the oil, the acid microemulsion presented much lower corrosion rate on N80 steel slide and much slower dissolution rate limestone, compared to those of hydrochloric acid and thickening acid with identical concentrations. The rotating disk experiments indicated acid microemulsion had a reaction rate constant 30 times lower than that of hydrochloric acid, which enabled it to penetrate far in the reservoir. The core flooding experiments showed that the permeability had been increased by 500% after acidification and the formation damage was negligible. Overall, the proposed acid microemulsion may be applied as an ideal acidifying fluid for high temperature limestone reservoirs.

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  • 收稿日期:2022-02-21
  • 最后修改日期:2022-03-12
  • 录用日期:2022-03-28
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