豫东地区陈四楼煤矿煤层为单一低透气性突出煤层,瓦斯预抽存在难度大、效率低的问题,严重制约了煤矿安全生产。为增加煤体透气性,提高瓦斯抽采效果,井下水力压裂是一种行之有效的措施。依据瓦斯赋存情况,在煤体瓦斯含量低于5 m 3/t区域...豫东地区陈四楼煤矿煤层为单一低透气性突出煤层,瓦斯预抽存在难度大、效率低的问题,严重制约了煤矿安全生产。为增加煤体透气性,提高瓦斯抽采效果,井下水力压裂是一种行之有效的措施。依据瓦斯赋存情况,在煤体瓦斯含量低于5 m 3/t区域进行水力压裂增透试验,既能大幅降低钻孔工程量,加快区域治理进度,又能有效保证压裂过程中施工安全,防范压裂期间瓦斯异常涌出,引起瓦斯事故,对低瓦斯区域实现科学治理、精准施策具有重要意义,同时也能为高瓦斯区域进行压裂尝试提供借鉴。展开更多
Xinji No. 2 underground coal mine extracts the coal seams #4 and #5. These two seams are highly gassy and gas drainage is required to control mine gas emission and reduce outburst risk. Because the seam permeability c...Xinji No. 2 underground coal mine extracts the coal seams #4 and #5. These two seams are highly gassy and gas drainage is required to control mine gas emission and reduce outburst risk. Because the seam permeability coefficient is very low and around 0.1 m^2/(MPa^2·d), a number of technologies have been trialled to enhance the seam permeability prior to gas drainage. Of these technologies trialled, the deep borehole presplitting blasting technology has been proven to be quite effective in increasing permeability. In Xinji No. 2 mine it doubled or sometimes tripled gas drainage volume. This paper describes the technology, its application in the enhancement of seam permeability in Xinji No. 2 coal mine, and its effect on gas drainage performance.展开更多
文摘豫东地区陈四楼煤矿煤层为单一低透气性突出煤层,瓦斯预抽存在难度大、效率低的问题,严重制约了煤矿安全生产。为增加煤体透气性,提高瓦斯抽采效果,井下水力压裂是一种行之有效的措施。依据瓦斯赋存情况,在煤体瓦斯含量低于5 m 3/t区域进行水力压裂增透试验,既能大幅降低钻孔工程量,加快区域治理进度,又能有效保证压裂过程中施工安全,防范压裂期间瓦斯异常涌出,引起瓦斯事故,对低瓦斯区域实现科学治理、精准施策具有重要意义,同时也能为高瓦斯区域进行压裂尝试提供借鉴。
文摘Xinji No. 2 underground coal mine extracts the coal seams #4 and #5. These two seams are highly gassy and gas drainage is required to control mine gas emission and reduce outburst risk. Because the seam permeability coefficient is very low and around 0.1 m^2/(MPa^2·d), a number of technologies have been trialled to enhance the seam permeability prior to gas drainage. Of these technologies trialled, the deep borehole presplitting blasting technology has been proven to be quite effective in increasing permeability. In Xinji No. 2 mine it doubled or sometimes tripled gas drainage volume. This paper describes the technology, its application in the enhancement of seam permeability in Xinji No. 2 coal mine, and its effect on gas drainage performance.
