割缝卸压致裂技术在碎软低渗煤层煤巷掘进中的应用
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摘要
为解决碎软低渗煤层掘进工作面瓦斯治理难题,采用数值模拟和现场工业性试验的方法对割缝卸压致裂技术的作用原理以及在碎软低渗煤层的适用性进行了研究。数值模拟表明:水力割缝使缝槽周围的煤岩体卸压,应力转移,消除了应力集中区,有利于煤层卸压增透;现场试验结果表明:割缝深度、宽度分别可达850、43 mm,割缝卸压钻孔的抽采浓度、纯量分别提高至普通钻孔的6.7、10.1倍,割缝卸压致裂后煤体的突出危险性大幅降低约52.71%,水平割缝钻孔与垂直割缝钻孔相间布置的方式能够保证主裂缝的稳定保持。
To solve the problem of gas control in the broken soft and low permeability coal seam face, this paper used numerical simulation and on-site industrial test method to study the principle of squeezing pressure cracking technology and the applicability of the soft and low permeability coal seam. The numerical simulation shows that the hydraulic tapping pressure relieves the stress of the coal seam, and the coal rock mass around the slot shows different degrees of pressure relief in different orientations centering on the slot. The soft coal seam is broken and no significant stress concentration occurs, which is conducive to coal seam pressure relief. The field test results show that the depth and width of the slotting can reach 850 mm and 43 mm respectively, and the extraction concentration and sizing amount of the squeezing pressure relief hole are increased to 6.7 and 10.1 times of the ordinary drilling hole respectively. The outstanding danger of the body is greatly reduced by about 52.71%. The horizontal grooving hole and the vertical grooving hole are arranged in a phase to ensure the stable maintenance of the main crack.
To solve the problem of gas control in the broken soft and low permeability coal seam face, this paper used numerical simulation and on-site industrial test method to study the principle of squeezing pressure cracking technology and the applicability of the soft and low permeability coal seam. The numerical simulation shows that the hydraulic tapping pressure relieves the stress of the coal seam, and the coal rock mass around the slot shows different degrees of pressure relief in different orientations centering on the slot. The soft coal seam is broken and no significant stress concentration occurs, which is conducive to coal seam pressure relief. The field test results show that the depth and width of the slotting can reach 850 mm and 43 mm respectively, and the extraction concentration and sizing amount of the squeezing pressure relief hole are increased to 6.7 and 10.1 times of the ordinary drilling hole respectively. The outstanding danger of the body is greatly reduced by about 52.71%. The horizontal grooving hole and the vertical grooving hole are arranged in a phase to ensure the stable maintenance of the main crack.
引文
[1]赵阳升,杨栋,胡耀青,等.低渗透煤储层煤层气开采有效技术途径的研究[J].煤炭学报,2001,26(5):455-458.
[2]林柏泉,孟凡伟,张海宾.基于区域瓦斯治理的钻割抽一体化技术及应用[J].煤炭学报,2011,36(1):75.
[3]沈春明,林柏泉,吴海进.高压水射流割缝及其对煤体透气性的影响[J].煤炭学报,2011,36(12):2058.
[4]刘明举,孔留安,郝富昌,等.水力冲孔技术在严重突出煤层中的应用[J].煤炭学报,2005,30(4):451.
[5]王兆丰,范迎春,李世生.水力冲孔技术在松软低透突出煤层中的应用[J].煤炭科学技术,2012,40(2):52.
[6]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):45-49.
[7]王海东.突出煤层掘进工作面CO2可控相变致裂防突技术[J].煤炭科学技术,2016,44(3):70-74.
[8]段康廉,冯增朝,赵阳升,等.低渗透煤层钻孔与水力割缝瓦斯排放的实验研究[J].煤炭学报,2002,27(1):50-53.
[9]唐巨鹏,杨森林,李利萍.不同水力割缝布置方式对卸压防突效果影响数值模拟[J].中国地质灾害与防治学报,2012,23(1):61-66.
[10]林柏泉,李子文,翟成,等.高压脉动水力压裂卸压增透技术及应用[J].采矿与安全工程学报,2011,28(3):452-455.
[11]马中飞,俞启香,陈晓祥.工作面水力卸压防突作用的数值模拟[J].中国安全科学学报,2006,16(10):27-31.
[12]蔺海晓,苏现波,刘晓,等.煤储层造缝及卸压增透实验研究[J].煤炭学报,2014,39(S2):432-435.
[13]张玉贵,张子敏,曹运兴.构造煤结构与瓦斯突出[J].煤炭学报,2007,32(3):281-284.
[14]琚宜文,李小诗.构造煤超微结构研究新进展[J].自然科学进展,2009,19(2):131-140.
[15]姜家钰,雷东记,谢向向,等.构造煤孔隙结构与瓦斯耦合特性研究[J].安全与环境学报,2015,15(1):123-128.
[16]林柏泉,周世宁,张仁贵.煤巷卸压带及其在煤和瓦斯突出危险性预测中的应用[J].中国矿业大学学报,1993,22(4):44-52.
[2]林柏泉,孟凡伟,张海宾.基于区域瓦斯治理的钻割抽一体化技术及应用[J].煤炭学报,2011,36(1):75.
[3]沈春明,林柏泉,吴海进.高压水射流割缝及其对煤体透气性的影响[J].煤炭学报,2011,36(12):2058.
[4]刘明举,孔留安,郝富昌,等.水力冲孔技术在严重突出煤层中的应用[J].煤炭学报,2005,30(4):451.
[5]王兆丰,范迎春,李世生.水力冲孔技术在松软低透突出煤层中的应用[J].煤炭科学技术,2012,40(2):52.
[6]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):45-49.
[7]王海东.突出煤层掘进工作面CO2可控相变致裂防突技术[J].煤炭科学技术,2016,44(3):70-74.
[8]段康廉,冯增朝,赵阳升,等.低渗透煤层钻孔与水力割缝瓦斯排放的实验研究[J].煤炭学报,2002,27(1):50-53.
[9]唐巨鹏,杨森林,李利萍.不同水力割缝布置方式对卸压防突效果影响数值模拟[J].中国地质灾害与防治学报,2012,23(1):61-66.
[10]林柏泉,李子文,翟成,等.高压脉动水力压裂卸压增透技术及应用[J].采矿与安全工程学报,2011,28(3):452-455.
[11]马中飞,俞启香,陈晓祥.工作面水力卸压防突作用的数值模拟[J].中国安全科学学报,2006,16(10):27-31.
[12]蔺海晓,苏现波,刘晓,等.煤储层造缝及卸压增透实验研究[J].煤炭学报,2014,39(S2):432-435.
[13]张玉贵,张子敏,曹运兴.构造煤结构与瓦斯突出[J].煤炭学报,2007,32(3):281-284.
[14]琚宜文,李小诗.构造煤超微结构研究新进展[J].自然科学进展,2009,19(2):131-140.
[15]姜家钰,雷东记,谢向向,等.构造煤孔隙结构与瓦斯耦合特性研究[J].安全与环境学报,2015,15(1):123-128.
[16]林柏泉,周世宁,张仁贵.煤巷卸压带及其在煤和瓦斯突出危险性预测中的应用[J].中国矿业大学学报,1993,22(4):44-52.