特种油气藏 ›› 2022, Vol. 29 ›› Issue (1): 66-72.DOI: 10.3969/j.issn.1006-6535.2022.01.010

• 油藏工程 • 上一篇    下一篇

页岩储层超临界CO2增透规律实验

吴迪, 耿岩岩, 肖晓春, 苗丰, 翟文博   

  1. 辽宁工程技术大学,辽宁 阜新 123000
  • 收稿日期:2021-01-18 修回日期:2021-11-20 出版日期:2022-02-25 发布日期:2023-01-10
  • 作者简介:吴迪(1981—),男,教授,博士生导师,2003年毕业于沈阳农业大学水利水电工程专业,2013年毕业于辽宁工程技术大学工程力学专业,获博士学位,现从事渗流力学及应用方向的教学和科研工作。
  • 基金资助:
    国家自然科学基金“压裂页岩吸附超临界CO2驱替CH4渗流与损伤耦合机理研究”(51974147)、“静动荷载作用的含弱层岩煤结构体滑移突变冲击机理研究”(51974186);辽宁省教育厅资助项目“页岩吸附超临界CO2驱替CH4运移规律研究”(LJ2019JL020)

Experimental Study on Variation Pattern of Enhanced Permeability of Supercritical CO2 in Shale Reservoirs

Wu Di, Geng Yanyan, Xiao Xiaochun, Miao Feng, Zhai Wenbo   

  1. Liaoning Technical University, Fuxin, Liaoning 123000, China
  • Received:2021-01-18 Revised:2021-11-20 Online:2022-02-25 Published:2023-01-10

摘要: 为研究超临界CO2对页岩储层的增透效果,利用自主研制的岩石三轴渗流实验装置,开展超临界CO2注入页岩储层增透规律研究。研究结果表明:页岩储层CH4渗透率随孔隙压力增加呈负指数变化,页岩样品注入超临界CO2后增透效果显著,CH4渗透率最大可提高103.98%(3号样品);恒温条件下,注入压力为9.0 MPa时超临界CO2增透效果好于8.0 MPa,随着超临界CO2注入压力逐渐增加至10.0 MPa,页岩开始出现裂化现象;实验温度为35~55 ℃,超临界CO2对于页岩的增透效果随着温度的增加而降低,波速衰减率和孔隙度随着温度的升高分别下降0.15、0.90个百分点,波速衰减率与温度呈线性递减关系。研究成果可为超临界CO2强化页岩气开发过程中提高页岩气储层渗透性提供理论依据。

关键词: 页岩气, 超临界CO2, 增透率, 温度, 波速衰减率

Abstract: In order to study the effect of supercritical CO2 on the enhanced permeability of shale reservoirs, a study was performed on the permeability enhancement pattern of supercritical CO2 injection into shale reservoirs with the self-developed rock triaxial seepage experimental device. The results of the study showed that the CH4 permeability of shale reservoirs varied negatively exponentially with increasing pore pressure, and the permeability was significantly enhanced after supercritical CO2 injection into shale samples; taking sample 3 as an example, the CH4 permeability could be increased by 103.98% at a maximum; the enhanced permeability of supercritical CO2 at injection pressure of 9.0 MPa was better than that at 8.0 MPa under the condition of constant temperature; as the injection pressure of supercritical CO2 gradually increased to 10.0 MPa, the shale started to fracture; when the test temperature was 35 to 55 ℃, the enhanced permeability of supercritical CO2 in shale was decreased with temperature raise, and the wave velocity attenuation rate and the porosity were decreased by 0.15 percentage points and 0.90 percentage points with temperature raise, respectively, showing a linear decreasing relationship between wave velocity attenuation rate and temperature. The study results provide a theoretical basis for enhancing the permeability of shale gas reservoirs during the development of supercritical CO2-enhanced shale gas.

Key words: shale gas, supercritical CO2, enhanced permeability, temperature, wave velocity attenuation rate

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