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| Application of pre-drainage gas technology of ground water sand fracturing well in coal uncovering in vertical shaft |
| Zhao Jinlong |
| Shanxi Huayang Group Xinneng Co., Ltd., Yangquan 045000, China |
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Abstract A total of five shafts were arranged in Boli Coal Mine of Huayang New Material Group Co., Ltd. After evaluation, No.3 ~ 15 coal seams in the mine field had outburst risk. In order to effectively prevent coal and gas outburst during wellbore construction, put an end to gas overrun during coal uncovering, and accelerate wellbore construction progress, surface pre-drainage gas wells are constructed beside the wellbore. Through the hydraulic sand fracturing process transformation of the target coal seam, the fracturing fracture extends to cover the wellbore and improves the stress concentration state of the wellbore pre-uncovering coal seam. A total of 4 ground pre-drainage gas wells were constructed in Boli Coal Mine before shaft construction. During the construction of 5 shafts, more than 30 coal seams were exposed successively, and no outburst accident occurred, which shortened the shaft construction period and ensured safe and efficient shaft construction.
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