Volume 43 Issue 5
Sep.  2024
Turn off MathJax
Article Contents
ZHOU Wenyu, WANG Xiaoming, CHEN Wenwen, DANG Zheng, HE Manqiu, ZHENG Aiwei, LIU Li. Influence of high-pressure conditions on the occurrence characteristics of shale adsorbed water: A case study of a shale reservoir in the Jiaoshiba area, Fuling, Chongqing[J]. Bulletin of Geological Science and Technology, 2024, 43(5): 95-104. doi: 10.19509/j.cnki.dzkq.tb20230316
Citation: ZHOU Wenyu, WANG Xiaoming, CHEN Wenwen, DANG Zheng, HE Manqiu, ZHENG Aiwei, LIU Li. Influence of high-pressure conditions on the occurrence characteristics of shale adsorbed water: A case study of a shale reservoir in the Jiaoshiba area, Fuling, Chongqing[J]. Bulletin of Geological Science and Technology, 2024, 43(5): 95-104. doi: 10.19509/j.cnki.dzkq.tb20230316

Influence of high-pressure conditions on the occurrence characteristics of shale adsorbed water: A case study of a shale reservoir in the Jiaoshiba area, Fuling, Chongqing

doi: 10.19509/j.cnki.dzkq.tb20230316
More Information
  • Author Bio:

    ZHOU Wenyu, E-mail: 1521789743@qq.com

  • Corresponding author: WANG Xiaoming, E-mail: sunwxm@cug.edu.cn
  • Received Date: 05 Jun 2023
  • Accepted Date: 19 Jul 2023
  • Rev Recd Date: 14 Jul 2023
  • Objective

    Shale generally contains water, and it is highly important to clarify the occurrence characteristics of adsorbed water in shale to improve the drainage effect of shale gas.

    Methods

    This study analysed shale cores from the JY11-4 and JY41-5 wells in the Jiaoshiba area of Fuling. The influence of high-pressure conditions on the occurrence characteristics of adsorbed water in shale was investigated using custom-designed frozen nitrogen adsorption experiments and nuclear magnetic resonance experiments.

    Results and Conclusion

    The results show that (1) under atmospheric pressure, the average volume of adsorbed water per unit mass calculated by the "weighing method" is 0.017 3 mL/g. The volume proportion of water in the micropores and mesopores (average of 90.94%) significantly exceeds that in the macropores (average of 9.06%). This may be because water molecules cannot occupy the adsorption sites in all the shale pores when the relative pressure is relatively low. Most water molecules condense in micropores and mesoporous pores, and only a few water molecules enter the macropores. In addition, the small and medium pores in clay-rich shale become "filled and blocked" by water molecules in the process of water adsorption. (2) Under a saturated water pressure of 30 MPa, the average adsorbed water volume per unit mass of the sample calculated by the "weighing method" is 0.021 6 mL/g. The volume proportions of water in the micropores and mesopores (average of 40.26%) is lower than that in macropores (average of 59.74%), which may be related to the fact that water molecules can occupy more adsorption sites on the inner surface of micropores and mesoporous pores under the action of capillary forces when the relative pressure is significantly increased. (3) Compared with normal pressure, high-pressure conditions increase the volume of water adsorbed per unit mass of shale (approximately 25% increase in the experiment), and the proportion of water volume in large pores is greater than that in micropores and mesoporous pores. (4) During hydraulic fracturing, the relative pressure of the reservoir increases significantly. Under the action of capillary forces, fracturing fluid may enter large pores that cannot enter under the pressure of the original reservoir to "relieve" the "unsaturated state" of the original shale reservoir. After fracturing is completed, the pressure around the reservoir is gradually released, and the fracturing fluid that originally enters the adsorption pores of the shale may have difficulty overcoming the capillary resistance at the pore, making it difficult to return.

     

  • The authors declare that no competing interests exist.
  • loading
  • [1]
    刘义生, 金吉能, 潘仁芳, 等. 渝东南盆缘转换带五峰组-龙马溪组常压页岩气保存条件评价[J]. 地质科技通报, 2023, 42(1): 253-263. doi: 10.19509/j.cnki.dzkq.tb20210768

    LIU Y S, JIN J N, PAN R F, et al. Preservation condition evaluation of normal pressure shale gas in the Wufeng and Longmaxi formations of basin margin transition zone, Southeast Chongqing[J]. Bulletin of Geological Science and Technology, 2023, 42(1): 253-263. (in Chinese with English abstract) doi: 10.19509/j.cnki.dzkq.tb20210768
    [2]
    NICOT J P, SCANLON B R. Water use for shale-gas production in texas, U.S. [J]. Environmental Science & Technology, 2012, 46(6): 3580-3586.
    [3]
    SINGH H. A critical review of water uptake by shales[J]. Journal of Natural Gas Science and Engineering, 2016, 34: 751-766. doi: 10.1016/j.jngse.2016.07.003
    [4]
    VENGOSH A, JACKSON R B, WARNER N, et al. A critical review of the risks to water resources from unconventional shale gas development and hydraulic fracturing in the United States[J]. Environmental Science & Technology, 2014, 48(15): 8334-8348.
    [5]
    CHEN G, ZHANG J, LU S, et al. Adsorption behavior of hydrocarbon on illite[J]. Energy & Fuels, 2016, 30(11): 9114-9121.
    [6]
    ZHAI Z Q, WANG X Q, JIN X, et al. Adsorption and diffusion of shale gas reservoirs in modeled clay minerals at different geological depths[J]. Energy & Fuels, 2014, 28(12): 7467-7473.
    [7]
    WANG S B, SONG Z G, CAO T T, et al. The methane sorption capacity of Paleozoic shales from the Sichuan Basin, China[J]. Marine and Petroleum Geology, 2013, 44: 112-119.
    [8]
    LI K W, HORNE R N. Experimental study of gas slippage in two-phase flow[J]. SPE Reservoir Evaluation & Engineering, 2004, 7(6): 409-415.
    [9]
    CHEN Z Y, SONG Y, LI Z, et al. The occurrence characteristics and removal mechanism of residual water in marine shales: A case study of Wufeng-Longmaxi shale in Changning-Weiyuan area, Sichuan Basin[J]. Fuel, 2019, 253: 1056-1070.
    [10]
    YEW C, CHENEVERT M, WANG C L, et al. Wellbore stress distribution produced by moisture adsorption[J]. SPE Drilling Engineering, 1990, 5(4): 311-316.
    [11]
    周文宇, 王小明, 曾凡桂, 等. 鸡西盆地主力煤层水可动性及其孔渗控制[J]. 地质科技通报, 2021, 40(3): 124-131. doi: 10.19509/j.cnki.dzkq.2021.0305

    ZHOU W Y, WANG X M, ZENG F G, et al. Water mobility of the main coal seam and its control of porosity and permeability in Jixi Basin[J]. Bulletin of Geological Science and Technology, 2021, 40(3): 124-131. (in Chinese with English abstract) doi: 10.19509/j.cnki.dzkq.2021.0305
    [12]
    卢振东, 刘成林, 臧起彪, 等. 高压压汞与核磁共振技术在致密储层孔隙结构分析中的应用: 以鄂尔多斯盆地合水地区为例[J]. 地质科技通报, 2022, 41(3): 300-310. doi: 10.19509/j.cnki.dzkq.2021.0256

    LU Z D, LIU C L, ZANG Q B, et al. Application of high pressure mercury injection and nuclear magnetic resonance in analysis of the pore structure of dense sandstone: A case study of the Heshui area, Ordos Basin[J]. Bulletin of Geological Science and Technology, 2022, 41(3): 300-310. (in Chinese with English abstract) doi: 10.19509/j.cnki.dzkq.2021.0256
    [13]
    YAO Y B, LIU D M, CHE Y, et al. Petrophysical characterization of coals by low-field nuclear magnetic resonance(NMR)[J]. Fuel, 2010, 89(7): 1371-1380.
    [14]
    SING K S W. Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity(Recommendations 1984)[J]. Pure and Applied Chemistry, 1985, 57(4): 603-619.
    [15]
    GE H K, YANG L, SHEN Y H, et al. Experimental investigation of shale imbibition capacity and the factors influencing loss of hydraulic fracturing fluids[J]. Petroleum Science, 2015, 12(4): 636-650.
    [16]
    姚艳斌, 刘大锰. 煤储层精细定量表征与综合评价模型[M]. 北京: 地质出版社, 2013.

    YAO Y B, LIU D M. Advanced quantitative characterization and comprehensive evaluation model of coalbed methane reservoirs[M]. Beijing: Geological Publishing House, 2013. (in Chinese)
    [17]
    KENYON W. Nuclear magnetic resonance as a petrophysical measurement[J]. International Journal of Radiation Applications & Instrumentation(Part E. Nuclear Geophysics), 1992, 6(2): 153-171.
    [18]
    李军, 金武军, 王亮, 等. 页岩气岩心核磁共振T2与孔径尺寸定量关系[J]. 测井技术, 2016, 40(4): 460-464.

    LI J, JIN W J, WANG L, et al. Quantitative relationship between NMR T2 and pore size of shale gas reservoir from core experiment[J]. Well Logging Technology, 2016, 40(4): 460-464. (in Chinese with English abstract)
    [19]
    党伟, 张金川, 王凤琴, 等. 富有机质页岩-水蒸气吸附热力学与动力学特性: 以鄂尔多斯盆地二叠系山西组页岩为例[J]. 石油与天然气地质, 2021, 42(1): 173-185.

    DANG W, ZHANG J C, WANG F Q, et al. Thermodynamics and kinetics of water vapor adsorption onto shale: A case study of the Permian Shanxi Formation, Ordos Basin[J]. Oil & Gas Geology, 2021, 42(1): 173-185. (in Chinese with English abstract)
    [20]
    张砚, 惠栋, 张鉴, 等. 四川盆地海相页岩水蒸气吸附特征及其主控因素: 以川南地区下志留统龙马溪组页岩为例[J]. 石油与天然气地质, 2022, 43(6): 1431-1444.

    ZHANG Y, HUI D, ZHANG J, et al. Characteristics and main controlling factors of water vapor adsorption in marine shale: A case study of the Lower Silurian Longmaxi shales in southern Sichuan Basin[J]. Oil & Gas Geology, 2022, 43(6): 1431-1444. (in Chinese with English abstract)
    [21]
    FENG D, LI X F, WANG X Z, et al. Water adsorption and its impact on the pore structure characteristics of shale clay[J]. Applied Clay Science, 2018, 155: 126-138.
  • 加载中

Catalog

    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

    1. 本站搜索
    2. 百度学术搜索
    3. 万方数据库搜索
    4. CNKI搜索

    Article Metrics

    Article Views(85) PDF Downloads(51) Cited by()
    Proportional views
    Related

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return