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温压条件对非饱和低渗透砂岩中CH4突破压力影响的实验研究

赵世宇 李铱 明亮 张勇 李旭峰 郑长远

赵世宇, 李铱, 明亮, 张勇, 李旭峰, 郑长远. 温压条件对非饱和低渗透砂岩中CH4突破压力影响的实验研究[J]. 地质科技通报, 2021, 40(3): 132-139. doi: 10.19509/j.cnki.dzkq.2021.0306
引用本文: 赵世宇, 李铱, 明亮, 张勇, 李旭峰, 郑长远. 温压条件对非饱和低渗透砂岩中CH4突破压力影响的实验研究[J]. 地质科技通报, 2021, 40(3): 132-139. doi: 10.19509/j.cnki.dzkq.2021.0306
Zhao Shiyu, Li Yi, Ming Liang, Zhang Yong, Li Xufeng, Zheng Changyuan. Experimental study on the effect of temperature and pressure on CH4 breakthrough pressure in unsaturated low-permeability sandstone[J]. Bulletin of Geological Science and Technology, 2021, 40(3): 132-139. doi: 10.19509/j.cnki.dzkq.2021.0306
Citation: Zhao Shiyu, Li Yi, Ming Liang, Zhang Yong, Li Xufeng, Zheng Changyuan. Experimental study on the effect of temperature and pressure on CH4 breakthrough pressure in unsaturated low-permeability sandstone[J]. Bulletin of Geological Science and Technology, 2021, 40(3): 132-139. doi: 10.19509/j.cnki.dzkq.2021.0306

温压条件对非饱和低渗透砂岩中CH4突破压力影响的实验研究

doi: 10.19509/j.cnki.dzkq.2021.0306
基金项目: 

国家自然科学基金 41702251

内蒙古自然科学基金 2019MS04018

江苏省煤基温室气体减排与资源化利用重点实验室创新项目 2019B005

青海省科学技术应用基础研究项目 2018-ZJ-785

详细信息
    作者简介:

    赵世宇(1992-), 男, 现正攻读环境工程专业硕士学位, 主要从事多孔介质渗流理论及应用研究。E-mail: zhaosy0707@163.com

    通讯作者:

    李铱(1988-), 男, 副教授, 主要从事多孔介质渗流理论及应用方面研究。E-mail: yi.li@imu.edu.cn

  • 中图分类号: P618.130.2+1

Experimental study on the effect of temperature and pressure on CH4 breakthrough pressure in unsaturated low-permeability sandstone

  • 摘要: 突破压力在气藏开采和盖层封闭性评价中起着重要的作用。为模拟地层温度压力变化对低渗透性砂岩中CH4突破压力的影响,采用逐步法对取自鄂尔多斯盆地早二叠世非饱和低渗透砂岩,进行了不同温压组合条件下的CH4突破压力实验。结果表明:随着温度或压力的升高,CH4突破压力和突破时间均呈下降趋势,且压力变化对CH4突破过程的影响更加显著。分析发现,温度压力对CH4突破压力的影响,是由于温压变化改变了界面张力和接触角的大小,进而控制突破压力的大小;另外,突破压力随着两相黏度比的增大而减小,且温度压力越高,黏度比对突破压力的影响越小。因此,实验温压范围内,对于非饱和低渗透砂岩储层,温度和压力越高越有利于气藏开采;对于非饱和低渗透砂岩盖层,温度和压力越低,盖层封闭性越好且越安全。

     

  • 图 1  岩心照片

    Figure 1.  Photographs of the core

    图 2  40倍偏光显微镜下岩心照片

    Figure 2.  Photographs of core under 40x polarizing microscope

    图 3  X射线衍射分析结果图

    Figure 3.  X-ray diffraction analysis results

    图 4  气体突破压力测试装置图

    Figure 4.  Diagram of gas breakthrough pressure test device

    图 5  CH4突破压力随温度、压力变化图

    Figure 5.  CH4 breakthrough pressure changes with temperature and pressure

    图 6  CH4突破时间随温度、压力变化图

    Figure 6.  CH4 breakthrough time changes with temperature and pressure

    图 7  CH4-H2O界面张力随温度、压力变化图(底图据文献[27])

    Figure 7.  CH4-H2O interfacial tension changes with temperature and pressure

    图 8  CH4突破压力随界面张力变化图

    Figure 8.  CH4 breakthrough pressure changes with interfacial tension

    图 9  两相密度差随温度、压力变化图

    Figure 9.  Density difference between the two phases changes with temperature and pressure

    图 10  CH4突破压力随CH4-H2O黏度比变化曲线

    Figure 10.  CH4 breakthrough pressure vs.CH4-H2O viscosity ratio curve

    表  1  注入压力增量和恒压时间

    Table  1.   Injection pressure increment and constant pressure time

    注入压力/MPa 恒压时间/min 注入压力增量/MPa
    P1≤2 30 0.2
    2<P1≤5 45 0.5
    5<P1≤10 60 1.0
    10<P1≤15 90 1.0
    15<P1 120 1.5
    注:P1为岩心入口端注入压力
    下载: 导出CSV
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