超低渗砂岩SiO2纳米颗粒吸附滞留特征
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非常规油气开发教育部重点实验室

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TE357

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国家科技重大专项2017ZX05009004-002_低渗-特低渗油藏纳米流体对储层油水相渗特性影响及其驱油效果研究


Adsorption characteristics of SiO2 nanoparticles in ultra-low permeability sandstone
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1.Key Laboratory of Unconventional Oil Gas Development China University of Petroleum East China,Ministry of Education;2.P R China

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    摘要:

    纳米颗粒因其独特的纳米效应在提高原油采收率具有广泛的应用前景,但超低渗储层孔喉细小,纳米颗粒的吸附滞留对其储层物性影响较大。本文基于SiO2纳米流体在超低渗岩心中的驱替实验,结合紫外可见分光光度实验提出了测试纳米颗粒在岩心中吸附量的方法。研究结果表明,随着纳米流体浓度(0.01-0.50wt%)增加,岩心注入压力升高,纳米颗粒滞留率增大(7.60%-87.50%)、渗透率损失率最高可达96.46%。后续NaCl溶液驱替可带走少许吸附不稳定的游离态纳米颗粒,但未明显缓解吸附滞留情况,因其已在岩心中形成有效封堵。驱替结束后岩心切片的SEM扫描图像显示,纳米颗粒集中吸附在岩心前段的孔喉和基质表面,占据流体渗流通道,引起孔喉结构变化,随纳米流体浓度增大,颗粒聚集现象越明显。

    Abstract:

    nanoparticles have a good application prospect in enhancing oil recovery due to its unique nano-effects, but the ultra-low permeability reservoirs have small pore throats, and the adsorption of nanoparticles has a greater impact on the physical properties of the reservoir. In this paper, based on the displacement experiment of SiO2 nanofluid in the ultra-low permeability core, combined with the ultraviolet-visible spectrophotometer, a method for measuring the adsorption capacity of nanoparticles was proposed. The research results showed that with the increase of nanofluid concentration (0.01-0.50wt%), the core injection pressure and the retention rate of nanoparticles (7.60%-87.50%) increased, in addition the highest permeability loss rate can reach 96.46%. The subsequent displacement of NaCl solution took away a few unstably adsorbed free nanoparticles, but did not alleviate the adsorption obviously because of the formation of effective plugging in the rock core. The scanning images of core sections after displacement demonstrated that the nanoparticles were concentrated on the pore throat and matrix surface at the front end of the core, occupying the fluid seepage channel, which caused structural changes in the pore throat. As the concentration of nanofluid increased, the particle aggregation phenomenon became more obvious.

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  • 收稿日期:2021-04-19
  • 最后修改日期:2021-05-26
  • 录用日期:2021-08-23
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