瓦斯抽采钻孔“钻-割-封”技术研究及应用
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摘要
为提高煤层透气性、改善抽采钻孔封孔质量,强化瓦斯抽采效果,消除煤层突出危险性,依据高压水射流破煤机理,提出"钻-割-封"技术,即对瓦斯抽采钻孔及封孔段周边煤体切割径向环形缝槽,然后注浆封孔。通过现场试验,验证采用"钻-割-封"技术钻孔的瓦斯抽采效果。现场试验结果表明:采用"钻-割-封"技术的抽采钻孔瓦斯浓度提高20%～30%,瓦斯抽采纯量相较于常规钻孔提高约1倍,实现煤层的卸压增透,提高了钻孔密封性。
In order to improve the permeability of coal seam and the sealing quality of gas drainage borehole, strengthening the effect of gas drainage and eliminating the danger of coal seam outburst, this paper proposed the drilling-slotting-sealing technology based on the mechanism of high pressure water jet breaking coal. That is to cut radial annular seam groove around gas extraction borehole and sealing hole section, and then grouting sealing hole. The effect of gas drainage borehole applied the drilling-slotting-sealing technology is verified through field test. The field test shows that: the gas concentration of the borehole using drilling-slotting-sealing technology increases 20% and 30%, and the net amount of gas extraction is about 1 times higher than that of conventional drilling, which realizes pressure relief and permeability improvement of coal seam and improves the tightness of drilling.
In order to improve the permeability of coal seam and the sealing quality of gas drainage borehole, strengthening the effect of gas drainage and eliminating the danger of coal seam outburst, this paper proposed the drilling-slotting-sealing technology based on the mechanism of high pressure water jet breaking coal. That is to cut radial annular seam groove around gas extraction borehole and sealing hole section, and then grouting sealing hole. The effect of gas drainage borehole applied the drilling-slotting-sealing technology is verified through field test. The field test shows that: the gas concentration of the borehole using drilling-slotting-sealing technology increases 20% and 30%, and the net amount of gas extraction is about 1 times higher than that of conventional drilling, which realizes pressure relief and permeability improvement of coal seam and improves the tightness of drilling.
引文
[1]林柏泉.矿井瓦斯防治理论与技术[M].徐州:中国矿业大学出版社,2010.
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[10]宋宜猛,王启飞,王安虎,等.液态CO2预裂爆破增透技术试验研究[J].中国煤炭,2015,41(8):112.
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[12]张永民,邱爱慈,秦勇.电脉冲可控冲击波煤储层增透原理与工程实践[J].煤炭科学技术,2017,45(9):79-85.
[13]李晓红,卢义玉,赵瑜,等.高压脉冲水射流提高松软煤层透气性的研究[J].煤炭学报,2008,33(12):33.
[14]刘非非,黄渊跃,徐全,等.进退式高压水射流割缝对煤层卸压增透效果的影响[J].煤矿安全,2014,45(9):165-168.
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[16]黄振飞,赵旭生,戴林超,等.水射流割缝深度分析及现场试验研究[J].煤矿安全,2017,48(2):5-8.
[17]黄振飞.煤层水力割缝影响因素及割缝深度预测模型研究[D].北京:煤炭科学研究总院,2017.
[2]于不凡.煤矿瓦斯灾害防治及利用技术手册[M].北京:煤炭工业出版社,2000.
[3] Zhou Fubao, Xia Tongqiang, Wang Xinxin, et al. Recent developments in coal mine methane extraction and utilization in China:A review[J]. Journal of Natural Gas Science&Engineering, 2016, 31:437-458.
[4]程远平,付建华,俞启香.中国煤矿瓦斯抽采技术的发展[J].采矿与安全工程学报,2009,26(2):127-139.
[5]张铁岗.矿井瓦斯综合治理技术[M].北京:煤炭工业出版社,2001.
[6]袁亮.卸压开采抽采瓦斯理论及煤与瓦斯共采技术体系[J].煤炭学报,2009,34(1):1-8.
[7]王兆丰.我国煤矿瓦斯抽放存在的问题及对策探讨[J].焦作工学院学报(自然科学版),2003(4):242.
[8]高峰,许爱斌,周福宝.保护层开采过程中煤岩损伤与瓦斯渗透性的变化研究[J].煤炭学报,2011,36(12):1979-1984.
[9]王海东.深部开采低渗透煤层预裂控制爆破增透机理研究[D].哈尔滨:中国地震局工程力学研究所,2012.
[10]宋宜猛,王启飞,王安虎,等.液态CO2预裂爆破增透技术试验研究[J].中国煤炭,2015,41(8):112.
[11]袁亮,林柏泉,杨威.我国煤矿水力化技术瓦斯治理研究进展及发展方向[J].煤炭科学技术,2015,43(1):45.
[12]张永民,邱爱慈,秦勇.电脉冲可控冲击波煤储层增透原理与工程实践[J].煤炭科学技术,2017,45(9):79-85.
[13]李晓红,卢义玉,赵瑜,等.高压脉冲水射流提高松软煤层透气性的研究[J].煤炭学报,2008,33(12):33.
[14]刘非非,黄渊跃,徐全,等.进退式高压水射流割缝对煤层卸压增透效果的影响[J].煤矿安全,2014,45(9):165-168.
[15]顾北方.高压水射流割缝煤体损伤演化规律研究与应用[D].北京:中国矿业大学(北京),2016.
[16]黄振飞,赵旭生,戴林超,等.水射流割缝深度分析及现场试验研究[J].煤矿安全,2017,48(2):5-8.
[17]黄振飞.煤层水力割缝影响因素及割缝深度预测模型研究[D].北京:煤炭科学研究总院,2017.