Coal Bed Methane (CBM) Stimulation by Liquid CO<sub>2</sub> Phase-transition Fracturing (LCPF) Technology

Xiaoyang Cheng; Yunlong Zou

doi:doi:10.11648/j.ogce.20190705.11

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Coal Bed Methane (CBM) Stimulation by Liquid CO₂ Phase-transition Fracturing (LCPF) Technology

Xiaoyang Cheng, Yunlong Zou

Published in International Journal of Oil, Gas and Coal Engineering (Volume 7, Issue 5)

Received: 10 October 2019 Accepted: 8 November 2019 Published: 14 November 2019

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Abstract

The permeability of coal seam is the main factor restricting the safe production of coal bed methane (CBM). In order to improve the extraction efficiency of CBM and reduce the probability of coal and gas outburst, it is of great significance to adopt artificial measures to enhance the connectivity of fracture network of coal reservoir. In this paper, the modification test of the fracture network in soft and low permeability coal seam is carried out by using the liquid CO₂ phase-transition fracturing (LCPF) technology through cross-boreholes in bottom drainage roadway. The results showed that the diameter of the borehole is obviously increased, and the gas flow rate and gas concentration are greatly enhanced, which indicates that the pores and fractures of the coal reservoir are effectively connected, and the influence radius of gas extraction is about 10m. Although, at the later stage of gas drainage period, the pure gas quantity and gas concentration show a decay trend, they still maintained at a high level, which is favorable for CBM extraction. Compared with hydraulic fracturing, the LCPF technology has better effect on permeability enhancement of coal seam in the early drainage stage after fracturing. The LCPF technology not only enhance the CBM extraction efficiency, but also shorten the driving period of roadways.

Published in	International Journal of Oil, Gas and Coal Engineering (Volume 7, Issue 5)
DOI	10.11648/j.ogce.20190705.11
Page(s)	103-108
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Cross-boreholes, Liquid CO₂ Phase-transition Fracturing, Influence Radius, Extraction Efficiency, Pure Gas Quantity, Gas Concentration

References

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[14]	F. Z. Yan, B. Q. Lin, C. J. Zhu, C. M. Shen, Q. L. Zou, C. Guo, T. Liu, “A novel E-CBM extraction technology based on the integration of hydraulic slotting and hydraulic fracturing,” J. Nat. Gas Sci. Eng., vol. 22, pp. 571-579, Jan. 2015.
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APA Style

Xiaoyang Cheng, Yunlong Zou. (2019). Coal Bed Methane (CBM) Stimulation by Liquid CO2 Phase-transition Fracturing (LCPF) Technology. International Journal of Oil, Gas and Coal Engineering, 7(5), 103-108. https://doi.org/10.11648/j.ogce.20190705.11

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ACS Style

Xiaoyang Cheng; Yunlong Zou. Coal Bed Methane (CBM) Stimulation by Liquid CO2 Phase-transition Fracturing (LCPF) Technology. Int. J. Oil Gas Coal Eng. 2019, 7(5), 103-108. doi: 10.11648/j.ogce.20190705.11

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AMA Style

Xiaoyang Cheng, Yunlong Zou. Coal Bed Methane (CBM) Stimulation by Liquid CO2 Phase-transition Fracturing (LCPF) Technology. Int J Oil Gas Coal Eng. 2019;7(5):103-108. doi: 10.11648/j.ogce.20190705.11

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@article{10.11648/j.ogce.20190705.11,
  author = {Xiaoyang Cheng and Yunlong Zou},
  title = {Coal Bed Methane (CBM) Stimulation by Liquid CO2 Phase-transition Fracturing (LCPF) Technology},
  journal = {International Journal of Oil, Gas and Coal Engineering},
  volume = {7},
  number = {5},
  pages = {103-108},
  doi = {10.11648/j.ogce.20190705.11},
  url = {https://doi.org/10.11648/j.ogce.20190705.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ogce.20190705.11},
  abstract = {The permeability of coal seam is the main factor restricting the safe production of coal bed methane (CBM). In order to improve the extraction efficiency of CBM and reduce the probability of coal and gas outburst, it is of great significance to adopt artificial measures to enhance the connectivity of fracture network of coal reservoir. In this paper, the modification test of the fracture network in soft and low permeability coal seam is carried out by using the liquid CO2 phase-transition fracturing (LCPF) technology through cross-boreholes in bottom drainage roadway. The results showed that the diameter of the borehole is obviously increased, and the gas flow rate and gas concentration are greatly enhanced, which indicates that the pores and fractures of the coal reservoir are effectively connected, and the influence radius of gas extraction is about 10m. Although, at the later stage of gas drainage period, the pure gas quantity and gas concentration show a decay trend, they still maintained at a high level, which is favorable for CBM extraction. Compared with hydraulic fracturing, the LCPF technology has better effect on permeability enhancement of coal seam in the early drainage stage after fracturing. The LCPF technology not only enhance the CBM extraction efficiency, but also shorten the driving period of roadways.},
 year = {2019}
}

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TY  - JOUR
T1  - Coal Bed Methane (CBM) Stimulation by Liquid CO2 Phase-transition Fracturing (LCPF) Technology
AU  - Xiaoyang Cheng
AU  - Yunlong Zou
Y1  - 2019/11/14
PY  - 2019
N1  - https://doi.org/10.11648/j.ogce.20190705.11
DO  - 10.11648/j.ogce.20190705.11
T2  - International Journal of Oil, Gas and Coal Engineering
JF  - International Journal of Oil, Gas and Coal Engineering
JO  - International Journal of Oil, Gas and Coal Engineering
SP  - 103
EP  - 108
PB  - Science Publishing Group
SN  - 2376-7677
UR  - https://doi.org/10.11648/j.ogce.20190705.11
AB  - The permeability of coal seam is the main factor restricting the safe production of coal bed methane (CBM). In order to improve the extraction efficiency of CBM and reduce the probability of coal and gas outburst, it is of great significance to adopt artificial measures to enhance the connectivity of fracture network of coal reservoir. In this paper, the modification test of the fracture network in soft and low permeability coal seam is carried out by using the liquid CO2 phase-transition fracturing (LCPF) technology through cross-boreholes in bottom drainage roadway. The results showed that the diameter of the borehole is obviously increased, and the gas flow rate and gas concentration are greatly enhanced, which indicates that the pores and fractures of the coal reservoir are effectively connected, and the influence radius of gas extraction is about 10m. Although, at the later stage of gas drainage period, the pure gas quantity and gas concentration show a decay trend, they still maintained at a high level, which is favorable for CBM extraction. Compared with hydraulic fracturing, the LCPF technology has better effect on permeability enhancement of coal seam in the early drainage stage after fracturing. The LCPF technology not only enhance the CBM extraction efficiency, but also shorten the driving period of roadways.
VL  - 7
IS  - 5
ER  -

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Author Information

Xiaoyang Cheng

State Key Laboratory of Gas Disaster Monitoring and Emergency Technology, Chongqing, China; China Coal Technology and Engineering Group Chongqing Research Institute, Chongqing, China
Yunlong Zou

State Key Laboratory of Gas Disaster Monitoring and Emergency Technology, Chongqing, China; China Coal Technology and Engineering Group Chongqing Research Institute, Chongqing, China

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Plain Text BibTeX RIS

APA Style

Xiaoyang Cheng, Yunlong Zou. (2019). Coal Bed Methane (CBM) Stimulation by Liquid CO2 Phase-transition Fracturing (LCPF) Technology. International Journal of Oil, Gas and Coal Engineering, 7(5), 103-108. https://doi.org/10.11648/j.ogce.20190705.11

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ACS Style

Xiaoyang Cheng; Yunlong Zou. Coal Bed Methane (CBM) Stimulation by Liquid CO2 Phase-transition Fracturing (LCPF) Technology. Int. J. Oil Gas Coal Eng. 2019, 7(5), 103-108. doi: 10.11648/j.ogce.20190705.11

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AMA Style

Xiaoyang Cheng, Yunlong Zou. Coal Bed Methane (CBM) Stimulation by Liquid CO2 Phase-transition Fracturing (LCPF) Technology. Int J Oil Gas Coal Eng. 2019;7(5):103-108. doi: 10.11648/j.ogce.20190705.11

Copy | Download

@article{10.11648/j.ogce.20190705.11,
  author = {Xiaoyang Cheng and Yunlong Zou},
  title = {Coal Bed Methane (CBM) Stimulation by Liquid CO2 Phase-transition Fracturing (LCPF) Technology},
  journal = {International Journal of Oil, Gas and Coal Engineering},
  volume = {7},
  number = {5},
  pages = {103-108},
  doi = {10.11648/j.ogce.20190705.11},
  url = {https://doi.org/10.11648/j.ogce.20190705.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ogce.20190705.11},
  abstract = {The permeability of coal seam is the main factor restricting the safe production of coal bed methane (CBM). In order to improve the extraction efficiency of CBM and reduce the probability of coal and gas outburst, it is of great significance to adopt artificial measures to enhance the connectivity of fracture network of coal reservoir. In this paper, the modification test of the fracture network in soft and low permeability coal seam is carried out by using the liquid CO2 phase-transition fracturing (LCPF) technology through cross-boreholes in bottom drainage roadway. The results showed that the diameter of the borehole is obviously increased, and the gas flow rate and gas concentration are greatly enhanced, which indicates that the pores and fractures of the coal reservoir are effectively connected, and the influence radius of gas extraction is about 10m. Although, at the later stage of gas drainage period, the pure gas quantity and gas concentration show a decay trend, they still maintained at a high level, which is favorable for CBM extraction. Compared with hydraulic fracturing, the LCPF technology has better effect on permeability enhancement of coal seam in the early drainage stage after fracturing. The LCPF technology not only enhance the CBM extraction efficiency, but also shorten the driving period of roadways.},
 year = {2019}
}

Copy | Download

TY  - JOUR
T1  - Coal Bed Methane (CBM) Stimulation by Liquid CO2 Phase-transition Fracturing (LCPF) Technology
AU  - Xiaoyang Cheng
AU  - Yunlong Zou
Y1  - 2019/11/14
PY  - 2019
N1  - https://doi.org/10.11648/j.ogce.20190705.11
DO  - 10.11648/j.ogce.20190705.11
T2  - International Journal of Oil, Gas and Coal Engineering
JF  - International Journal of Oil, Gas and Coal Engineering
JO  - International Journal of Oil, Gas and Coal Engineering
SP  - 103
EP  - 108
PB  - Science Publishing Group
SN  - 2376-7677
UR  - https://doi.org/10.11648/j.ogce.20190705.11
AB  - The permeability of coal seam is the main factor restricting the safe production of coal bed methane (CBM). In order to improve the extraction efficiency of CBM and reduce the probability of coal and gas outburst, it is of great significance to adopt artificial measures to enhance the connectivity of fracture network of coal reservoir. In this paper, the modification test of the fracture network in soft and low permeability coal seam is carried out by using the liquid CO2 phase-transition fracturing (LCPF) technology through cross-boreholes in bottom drainage roadway. The results showed that the diameter of the borehole is obviously increased, and the gas flow rate and gas concentration are greatly enhanced, which indicates that the pores and fractures of the coal reservoir are effectively connected, and the influence radius of gas extraction is about 10m. Although, at the later stage of gas drainage period, the pure gas quantity and gas concentration show a decay trend, they still maintained at a high level, which is favorable for CBM extraction. Compared with hydraulic fracturing, the LCPF technology has better effect on permeability enhancement of coal seam in the early drainage stage after fracturing. The LCPF technology not only enhance the CBM extraction efficiency, but also shorten the driving period of roadways.
VL  - 7
IS  - 5
ER  -

Copy | Download