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| Research on reasonable drilling length optimization of directional long borehole in Gaojiazhuang Coal Mine |
| Liu Dong1, Li Runzhi2, 3 |
| 1. Shanxi Zhongyang Rongxin Coking Co., Ltd., Lvliang 033400, China; 2. Shenyang Research Institute Co., Ltd., Fushun 113122, China; 3. State Key Laboratory of Coal Mine Safety Technology, Fushun 113122, China |
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Abstract In order to ensure the extraction effect of directional long borehole in the whole area and improve the extraction efficiency of directional long borehole. Taking No.3 coal seam of Gaojiazhuang Coal Mine as the research object, the attenuation law of negative pressure in directional long borehole along the direction of borehole length was simulated by COMSOL Multiphysics, and then the regional characteristics of coal seam under the influence of borehole extraction were analyzed, which provided scientific basis for optimizing borehole length and determining reasonable extraction time. The results show that with the increase of the negative pressure of the orifice, the negative pressure loss in the orifice has little change, and the negative pressure loss per 100 meters is 0.93 ~ 1.037 kPa. The reasonable construction length of directional drainage borehole in No.3 coal seam is 300 ~ 400 m. The extraction pure amount and daily cumulative pure amount are proportional to the extraction negative pressure. With the increase of extraction time, the negative pressure loss is significantly lower than that in the early stage of extraction, and the pure amount of extraction and daily cumulative pure amount gradually increase.
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