Research on Segmented Hydraulic Fracturing Technology for Directional Long Boreholes in Coal Mines

Zhanjin Lu

doi:10.54097/rj63z660

Authors

Zhanjin Lu

DOI:

https://doi.org/10.54097/rj63z660

Keywords:

Coal Mines; Directional Long Drilling; Segmented Hydraulic Fracturing; Crack Propagation; Extraction.

Abstract

Hydraulic fracturing in coal mines is an advanced technology that reduces pressure, increases permeability, and effectively improves the effectiveness of coal seam gas extraction. In order to improve coal seam gas extraction and effectively prevent gas disasters in Daning Coal Mine, the segmented hydraulic fracturing process and its crack propagation law were analyzed. The directional long borehole segmented hydraulic fracturing technology in the coal mine was applied on-site in Daning Coal Mine. The research results show that the segmented hydraulic fracturing process can be divided into four stages: system water filling, system pressurization, crack propagation, and system pressure relief. Under the same extraction time conditions, the average increase in pure drilling extraction after hydraulic fracturing at the Xida 1-05 drilling site of Daning Coal Mine is 30%.

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