Abstract
In view of the problems of rapid attenuation of concentration and flow rate and the small extraction influence radius in the process of gas extraction in Huanglong Coalfield, the evolution characteristics of in situ stress and coal compressive strength on hydraulic fracturing cracks in the study area were analyzed using RFPA2D-Flow simulation software. A self-developed complete set of coal mine underground hydraulic fracturing equipment was also used to develop the high-efficiency gas extraction technology of the coal seam open-hole quick-sealing hydraulic fracturing. The engineering application test was conducted in No. 2 coal mine in Huanglong Coalfield. The findings suggest that the higher the in situ stress deviation and coal firmness coefficient are, the more the hydraulic fracturing crack direction tends to be single. Moreover, the coal seam fracture pressure in the test area should be 7.3–15.4 MPa. On the site, five directional long-hole drilling operations were completed, with a single-hole depth of 240–285 m and a single-hole maximum pumping pressure of 19 MPa. After fracturing, the concentrations of single-hole gas extraction and the pure quantity of 100 m extraction were increased by 0.720.5 and 1.79.8 times, respectively. The gas drainage effect was clearly improved, and the coal seam gas drainage ability was enhanced when the hydraulic fracturing and permeability enhancement methods were adopted.
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Acknowledgement
This study was financially supported by the National Natural Science Foundation of China (Nos. 5173-4007, 5217-4207, 5187-4236, 5167-4192 and 5190-4236) and Science Fund of Shaanxi Province for Distinguished Young Scholars (No. 2020JC-48).
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Jingfei Zhang performed data analysis and writing—original draft preparation.
Siqing Sun did conceptualization, methodology, and funding acquisition.
Shugang Li contributed to writing—review and editing and funding acquisition.
Dongdong Chen performed methodology.
Jizhan Zhao did data curation.
Haifei Lin validated the study.
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Zhang, J., Sun, S., Li, S. et al. Research and engineering practice of high-efficiency gas extraction technology by hydraulic fracturing: a case study of Huanglong Coalfield in China. Arab J Geosci 15, 1012 (2022). https://doi.org/10.1007/s12517-022-10299-9
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DOI: https://doi.org/10.1007/s12517-022-10299-9