IDEAS home Printed from https://ideas.repec.org/a/gam/jeners/v15y2022i19p7373-d935872.html
   My bibliography  Save this article

Investigation of the Evolution of Stratum Fracture during the Cavity Expansion of Underground Coal Gasification

Author

Listed:
  • Zhen Dong

    (Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
    These authors contributed equally to this work.)

  • Haiyang Yi

    (North China Institute of Science and Technology, Langfang 065201, China)

  • Yufeng Zhao

    (Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
    These authors contributed equally to this work.)

  • Xinggang Wang

    (Research Institute of Petroleum Exploration & Development, PetroChina Tuha Oilfield Company, Hami 839009, China)

  • Tingxiang Chu

    (North China Institute of Science and Technology, Langfang 065201, China)

  • Junjie Xue

    (Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China)

  • Hanqi Wu

    (PetroChina Gas Storage Company, Beijing 100101, China)

  • Shanshan Chen

    (Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China)

  • Mengyuan Zhang

    (Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China)

  • Hao Chen

    (Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China)

Abstract

The evolution of fracture zone controls the safety of underground coal gasification (UCG) in terms of gas emission and water leakage. In order to understand the fracture propagation in the confining rock of a UCG cavity with various influence factors, this paper implemented a set of numerical models based on different geological and operating conditions. Analysis was implemented on the mechanism of fracture propagation and its evolution characteristics, suggesting that (a) continuum expansion of the cavity leads a near-field fracture circle in confining rock initially, followed by the roof caving and successive propagation of shear band. (b) The key observed influence factors of fracture propagation are the grade of confining rock, overburden pressure, dimension of the cavity and gasifying pressure, the linear relationships between them, and the fracture height. Additionally, the fracture depth in the base board was mainly caused by tensile fracture. (c) A model was proposed based on the evolution of fracture height and depth in roof and base board, respectively. Validation of this model associated with orthogonal tests suggests a good capacity for predicting fracture distribution. This paper has significance in guiding the design of the gasifying operation and safety assessment of UCG cavities.

Suggested Citation

  • Zhen Dong & Haiyang Yi & Yufeng Zhao & Xinggang Wang & Tingxiang Chu & Junjie Xue & Hanqi Wu & Shanshan Chen & Mengyuan Zhang & Hao Chen, 2022. "Investigation of the Evolution of Stratum Fracture during the Cavity Expansion of Underground Coal Gasification," Energies, MDPI, vol. 15(19), pages 1-15, October.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:19:p:7373-:d:935872
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/1996-1073/15/19/7373/pdf
    Download Restriction: no
    File URL: https://www.mdpi.com/1996-1073/15/19/7373/
    Download Restriction: no
    ---><---

    References listed on IDEAS

    as
    1. Daggupati, Sateesh & Mandapati, Ramesh N. & Mahajani, Sanjay M. & Ganesh, Anuradda & Mathur, D.K. & Sharma, R.K. & Aghalayam, Preeti, 2010. "Laboratory studies on combustion cavity growth in lignite coal blocks in the context of underground coal gasification," Energy, Elsevier, vol. 35(6), pages 2374-2386.
    2. Magdalena Pankiewicz-Sperka & Krzysztof Kapusta & Wioleta Basa & Katarzyna Stolecka, 2021. "Characteristics of Water Contaminants from Underground Coal Gasification (UCG) Process—Effect of Coal Properties and Gasification Pressure," Energies, MDPI, vol. 14(20), pages 1-12, October.
    3. Christopher Otto & Thomas Kempka, 2015. "Thermo-Mechanical Simulations of Rock Behavior in Underground Coal Gasification Show Negligible Impact of Temperature-Dependent Parameters on Permeability Changes," Energies, MDPI, vol. 8(6), pages 1-28, June.
    4. Jowkar, Amin & Sereshki, Farhang & Najafi, Mehdi, 2018. "A new model for evaluation of cavity shape and volume during Underground Coal Gasification process," Energy, Elsevier, vol. 148(C), pages 756-765.
    5. Su, Fa-qiang & Hamanaka, Akihiro & Itakura, Ken-ichi & Zhang, Wenyan & Deguchi, Gota & Sato, Kohki & Takahashi, Kazuhiro & Kodama, Jun-ichi, 2018. "Monitoring and evaluation of simulated underground coal gasification in an ex-situ experimental artificial coal seam system," Applied Energy, Elsevier, vol. 223(C), pages 82-92.
    6. Md M. Khan & Joseph P. Mmbaga & Ahad S. Shirazi & Japan Trivedi & Qingzia Liu & Rajender Gupta, 2015. "Modelling Underground Coal Gasification—A Review," Energies, MDPI, vol. 8(11), pages 1-66, November.
    7. Krzysztof Kapusta, 2021. "Effect of Lignite Properties on Its Suitability for the Implementation of Underground Coal Gasification (UCG) in Selected Deposits," Energies, MDPI, vol. 14(18), pages 1-11, September.
    Full references (including those not matched with items on IDEAS)

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Xin, Lin & An, Mingyu & Feng, Mingze & Li, Kaixuan & Cheng, Weimin & Liu, Weitao & Hu, Xiangming & Wang, Zhigang & Han, Limin, 2021. "Study on pyrolysis characteristics of lump coal in the context of underground coal gasification," Energy, Elsevier, vol. 237(C).
    2. Yuteng Xiao & Jihang Yin & Yifan Hu & Junzhe Wang & Hongsheng Yin & Honggang Qi, 2019. "Monitoring and Control in Underground Coal Gasification: Current Research Status and Future Perspective," Sustainability, MDPI, vol. 11(1), pages 1-14, January.
    3. Jacek Nowak & Magdalena Kokowska-Pawłowska & Joanna Komorek & Marian Wiatowski & Krzysztof Kapusta & Zdzisław Adamczyk, 2022. "Optical Properties of Coal after Ex-Situ Experimental Simulation of Underground Gasification at Pressures of 10 and 40 bar," Energies, MDPI, vol. 15(23), pages 1-19, November.
    4. Ján Kačur & Marek Laciak & Milan Durdán & Patrik Flegner, 2023. "Investigation of Underground Coal Gasification in Laboratory Conditions: A Review of Recent Research," Energies, MDPI, vol. 16(17), pages 1-55, August.
    5. Mohammadreza Shahbazi & Mehdi Najafi & Mohammad Fatehi Marji, 2019. "On the mitigating environmental aspects of a vertical well in underground coal gasification method," Mitigation and Adaptation Strategies for Global Change, Springer, vol. 24(3), pages 373-398, March.
    6. Su, Fa-qiang & Wu, Jun-bo & Tao-Zhang, & Deng, Qi-chao & Yu, Yi-he & Hamanaka, Akihiro & Dai, Meng-Jia & Yang, Jun-Nan & He, Xiao-long, 2023. "Study on the monitoring method of cavity growth in underground coal gasification under laboratory conditions," Energy, Elsevier, vol. 263(PE).
    7. Krzysztof Skrzypkowski & Krzysztof Zagórski & Anna Zagórska, 2021. "Determination of the Extent of the Rock Destruction Zones around a Gasification Channel on the Basis of Strength Tests of Sandstone and Claystone Samples Heated at High Temperatures up to 1200 °C and ," Energies, MDPI, vol. 14(20), pages 1-27, October.
    8. Yanpeng Chen & Tianduoyi Wang & Jinhua Zhang & Mengyuan Zhang & Junjie Xue & Juntai Shi & Yongshang Kang & Shengjie Li, 2022. "Simulation of Water Influx and Gasified Gas Transport during Underground Coal Gasification with Controlled Retracting Injection Point Technology," Energies, MDPI, vol. 15(11), pages 1-29, May.
    9. Milan Durdán & Marta Benková & Marek Laciak & Ján Kačur & Patrik Flegner, 2021. "Regression Models Utilization to the Underground Temperature Determination at Coal Energy Conversion," Energies, MDPI, vol. 14(17), pages 1-28, September.
    10. Fa-qiang Su & Akihiro Hamanaka & Ken-ichi Itakura & Gota Deguchi & Wenyan Zhang & Hua Nan, 2018. "Evaluation of a Compact Coaxial Underground Coal Gasification System Inside an Artificial Coal Seam," Energies, MDPI, vol. 11(4), pages 1-11, April.
    11. Jacek Borgulat & Katarzyna Ponikiewska & Łukasz Jałowiecki & Aleksandra Strugała-Wilczek & Grażyna Płaza, 2022. "Are Wetlands as an Integrated Bioremediation System Applicable for the Treatment of Wastewater from Underground Coal Gasification Processes?," Energies, MDPI, vol. 15(12), pages 1-19, June.
    12. Jowkar, Amin & Sereshki, Farhang & Najafi, Mehdi, 2018. "A new model for evaluation of cavity shape and volume during Underground Coal Gasification process," Energy, Elsevier, vol. 148(C), pages 756-765.
    13. Huijun Fang & Yuewu Liu & Tengze Ge & Taiyi Zheng & Yueyu Yu & Danlu Liu & Jiuge Ding & Longlong Li, 2022. "A Review of Research on Cavity Growth in the Context of Underground Coal Gasification," Energies, MDPI, vol. 15(23), pages 1-21, December.
    14. Zhizhen Zhang & Xiao Yang & Xiaoji Shang & Huai Yang, 2022. "A Thermal-Hydrological-Mechanical-Chemical Coupled Mathematical Model for Underground Coal Gasification with Random Fractures," Mathematics, MDPI, vol. 10(16), pages 1-21, August.
    15. Marek Laciak & Ján Kačur & Milan Durdán, 2022. "Modeling and Control of Energy Conversion during Underground Coal Gasification Process," Energies, MDPI, vol. 15(7), pages 1-6, March.
    16. Xi Lin & Qingya Liu & Zhenyu Liu, 2018. "Estimation of Effective Diffusion Coefficient of O 2 in Ash Layer in Underground Coal Gasification by Thermogravimetric Apparatus," Energies, MDPI, vol. 11(2), pages 1-14, February.
    17. Christopher Otto & Thomas Kempka, 2017. "Prediction of Steam Jacket Dynamics and Water Balances in Underground Coal Gasification," Energies, MDPI, vol. 10(6), pages 1-17, May.
    18. Javed, Syed Bilal & Uppal, Ali Arshad & Bhatti, Aamer Iqbal & Samar, Raza, 2019. "Prediction and parametric analysis of cavity growth for the underground coal gasification project Thar," Energy, Elsevier, vol. 172(C), pages 1277-1290.
    19. Su, Fa-qiang & Hamanaka, Akihiro & Itakura, Ken-ichi & Zhang, Wenyan & Deguchi, Gota & Sato, Kohki & Takahashi, Kazuhiro & Kodama, Jun-ichi, 2018. "Monitoring and evaluation of simulated underground coal gasification in an ex-situ experimental artificial coal seam system," Applied Energy, Elsevier, vol. 223(C), pages 82-92.
    20. Hao Chen & Yong Qin & Yanpeng Chen & Zhen Dong & Junjie Xue & Shanshan Chen & Mengyuan Zhang & Yufeng Zhao, 2023. "Quantitative Evaluation of Underground Coal Gasification Based on a CO 2 Gasification Agent," Energies, MDPI, vol. 16(19), pages 1-10, October.

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:gam:jeners:v:15:y:2022:i:19:p:7373-:d:935872. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: MDPI Indexing Manager (email available below). General contact details of provider: https://www.mdpi.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.