Volume 7, Issue 5, September 2019, Page: 103-108
Coal Bed Methane (CBM) Stimulation by Liquid CO2 Phase-transition Fracturing (LCPF) Technology
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
Received: Oct. 10, 2019;       Accepted: Nov. 8, 2019;       Published: Nov. 14, 2019
DOI: 10.11648/j.ogce.20190705.11      View  325      Downloads  113
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.
Cross-boreholes, Liquid CO2 Phase-transition Fracturing, Influence Radius, Extraction Efficiency, Pure Gas Quantity, Gas Concentration
To cite this article
Xiaoyang Cheng, Yunlong Zou, Coal Bed Methane (CBM) Stimulation by Liquid CO2 Phase-transition Fracturing (LCPF) Technology, International Journal of Oil, Gas and Coal Engineering. Vol. 7, No. 5, 2019, pp. 103-108. doi: 10.11648/j.ogce.20190705.11
Copyright © 2019 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
F. Cai, Z. G. Liu, “Intensified extracting gas and rapidly diminishing outburst-risk using deep-hole presplitting blast technology before opening coal seam in shaft influenced by fault,” First International Symposium on Mine Safety Science and Engineering, vol. 26, pp. 418-423, Nov. 2011.
Q. Ye, Z. Z. Jia, C. S. Zhen, “Study on hydraulic-controlled blasting technology for pressure relief and permeability improvement in a deep hole,” J. Petrol. Sci. Eng. vol. 159, pp. 433-442, Jul. 2017.
H. Soyama, Y. Yanauchi, “High-speed observation ultrahigh-speed submerged water jets,” Exp. Therm. Fluid Sci., vol. 12, pp. 411-416, Oct. 1996.
C. M. Shen, B. Q. Lin, Q. Z. Zhang, “nduced drill-spray during hydraulic slotting of a coal seam and its influence on gas extraction,” Int. J. Min. Sci. Technol., vol. 22, pp. 785-791, Nov. 2012.
Q. L. Zou, B. Q. Lin, “Fluid-solid coupling characteristics of gas-bearing coal subject to hydraulic slotting: an experimental investigation,” Energy Fuels, vol. 32, no. 2, pp. 1047-1060, Oct. 2018.
I. Song, B. C. Haimson, “Effect of pressurization rate and initial pore pressure on the magnitude of hydrofracturing breakdown pressure in table rock sandstone,” American Rock Mechanics Association, pp. 235-242, Jul. 2001.
T. Wang, W. B. Zhou, J. H. Chen, X. Xiao, Y. Li, X. Y. Zhao, “Simulation of hydraulic fracturing using particle flow method and application in a coal mine,” Int. J. Coal Geol., vol. 121, pp. 1-13, Jan. 2014.
M. M. Hossain, M. K. Rahman, “Numerical simulation of complex fracture growth during tight reservoir stimulation by hydraulic fracturing,” J. Pet. Sci. Eng., vol. 60, pp. 86-104, Feb. 2008.
B. X. Huang, C. Y. Liu, J. H. Fu, H. Guan, “Hydraulic fracturing after water pressure control blasting for increased fracturing,” Int. J. Rock Mech. Min. Sci., vol. 48, pp. 976-983, Sep. 2011.
F. P. Wu, X. M. Wei, Z. X. Chen, S. S. Rahman, C. S. Pu, X. J. Li, Y. Y. Zhang, “Numerical simulation and parametric analysis for designing high energy gas fracturing,” J. Nat. Gas Sci. Eng., vol. 53, pp. 218-236, May. 2018.
W. C. Zhu, D. Gai, C. H. Wei, S. G. Li, “High-pressure air blasting experiments on concrete and implications for enhanced coal gas drainage,” J. Nat. Gas Sci. Eng., vol. 36, pp. 1253-1263, Nov. 2016.
K. Y. Tian, J. Y. Zheng, “The application of hydraulic fracturing outburst prevention measures,” Pro. Eng., vol. 26, pp. 495-500, Nov. 2011.
S. S. Askarimarnania, G. Willgoosea, “Inferring the shape of fractures and hydraulic properties of the coal seam using inverse modeling on pumping test results-broke, NSW, Australia,” Procedia Environmental Sciences, vol. 25, pp. 11-18, Apr. 2015.
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.
T. K. Lu, Z. F. Wang, H. M. Yang, P. J. Yuan, Y. B. Han, X. M. Sun, “Improvement of coal seam gas drainage by under-panel cross-strata stimulation using highly pressurized gas,” Int. J. Rock Mech. Min. Sci., vol. 77, pp. 300-312, Jul. 2015.
P. Konicek, K. Soucek, L. Stas, R. Singh, “Long-hole destress blasting for rockburst control during deep underground coal mining,” Int. J. Rock Mech. Min. Sci., vol. 61, pp. 141-153, Jul. 2013.
Y. X. Cao, J. S. Zhang, H. Zhai, G. T. Fu, L. Tian, S. M. Liu, “CO2 gas fracturing: a novel reservoir stimulation technology in low permeability gassy coal seams,” Fuel, vol. 203, pp. 197-207, Sep. 2017.
P. Hou, F. Gao, Y. Ju, H. M. Cheng, Y. N. Gao, Y. Xue, Y. G. Yang, “Changes in pore structure and permeability of low permeability coal under pulse gas fracturing,” J. Nat. Gas Sci. Eng., vol. 34, pp. 1017-1026, Aug. 2016.
Browse journals by subject