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Dynamic Secondary Borehole-Sealing Method for Gas Drainage Boreholes along the Coal Seam

机译：煤层气排水钻孔的动态二级钻孔密封方法

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摘要

Under the influence of advanced abutment pressure, the tightness of a borehole is destroyed, so secondary borehole sealing is needed; however, the opportune time for a secondary borehole sealing is unclear. In addition, current borehole-sealing devices do not have a secondary borehole-sealing functionality. In this paper, an opportunity election model of secondary borehole sealing was established, and a dynamic secondary borehole-sealing device was developed. In working face 3908 of the Kaiyuan Coal Mine, an in situ dynamic secondary borehole-sealing test was conducted. The test results show that the tightness of the boreholes sealed with high-water-expansion slurry is obviously better than that of the boreholes sealed with cement mortar and polyurethane. When a borehole is destroyed by the peak of the advanced abutment pressure, the secondary borehole-sealing measures can significantly improve borehole suction pressure, gas concentration, and gas drainage amount in the advanced abutment pressure loading stage.
机译：在晚期邻接压力的影响下，钻孔的紧张性被破坏，因此需要辅助钻孔密封;然而，次级钻孔密封的适当时间尚不清楚。另外，电流钻孔密封装置不具有次级钻孔密封功能。在本文中，建立了二次钻孔密封的机会选举模型，开发了一种动态的二级钻孔密封装置。在开元煤矿的工作面3908中，进行了原位动态的二级钻孔密封试验。测试结果表明，用高水膨胀浆料密封的钻孔的紧张显着优于用水泥砂浆和聚氨酯密封的钻孔。当通过先进的邻接压力的峰值破坏钻孔时，次级钻孔密封措施可以显着改善晚期邻接压力负载阶段的钻孔吸力压力，气体浓度和瓦斯排水量。

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    Wei Qin; Jialin Xu;

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  • 年度 2018
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  • 正文语种 eng
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