邓家庄矿顺层钻孔抽采瓦斯增透技术研究

发布时间：2018-01-06 03:35

本文关键词：邓家庄矿顺层钻孔抽采瓦斯增透技术研究　出处：《辽宁工程技术大学》2014年硕士论文　论文类型：学位论文

【摘要】：瓦斯是制约煤矿安全生产的一个重要因素,抽采瓦斯是防治瓦斯灾害的根本措施,而煤层透气性是决定瓦斯抽采效果的关键因素,因此,改善煤层透气性成为煤矿井下抽采瓦斯的重要研究内容。针对单一低透气性煤层瓦斯抽采效率低的技术难题,结合邓家庄矿5#煤层15200工作面的实际赋存条件,决定采用水力压裂的方法提高5#煤层的透气性,首先理论分析了水力压裂过程中裂缝产生的条件及裂缝的扩展形式和方向,决定在每两个压裂孔之间布置一个抽采孔(控制孔),并对该控制孔进行扩孔以增加其抽采半径；其次理论计算了水力压裂增透技术的参数。利用RFPA2d-Flow软件对是否含有控制孔条件下的压裂范围和渗流孔隙水压力进行了数值模拟分析,得出在相同注水压力下,当有控制孔存在时,增透效果更好。最后,介绍了水力压裂注水系统、封孔材料和封孔工艺。在此基础上,进行了现场试验,与普通顺层钻孔相比,在抽采流量提高了8倍,最后维持在0.3 m~3/min,抽采的瓦斯浓度达到80%以上。经过5个月的预抽瓦斯含量由11.98 m~3/t降为4.5 m~3/t,瓦斯抽采率达到了62.4%,透气性系数提高234倍,试验取得了较好的抽采效果,为相似条件的瓦斯抽采提供了理论和技术基础。
[Abstract]:Gas extraction is the fundamental measure to prevent gas disaster, and the permeability of coal seam is the key factor to determine the effect of gas extraction. Improving the permeability of coal seam has become an important research content of gas extraction in coal mine, aiming at the technical problem of low efficiency of gas extraction in single low permeability coal seam. Combined with the actual occurrence conditions of 15200 coal face in Dengjiazhuang Coal Mine, hydraulic fracturing method was adopted to improve the permeability of coal seam. Firstly, the condition of fracture formation, the form and direction of fracture propagation in the process of hydraulic fracturing are analyzed theoretically, and a pumping hole (control hole) is decided to be arranged between each two fracturing holes. The control hole is expanded to increase the extraction radius. Secondly, the parameters of hydraulic fracturing antitransmittance technology are calculated theoretically. The fracturing range and percolation pore pressure under the condition of controlling pore are analyzed by RFPA2d-Flow software. Under the same water injection pressure, the antireflection effect is better when there are control holes. Finally, the hydraulic fracturing water injection system, pore sealing material and sealing technology are introduced. On this basis, field tests are carried out. Compared with the normal bedding drilling, the drainage flow rate is increased by 8 times, and finally maintained at 0.3 mm / min. The concentration of gas extracted is more than 80%. After 5 months of pre-drainage, the content of gas is reduced from 11.98 mg / t to 4.5mV / t, and the rate of gas extraction is up to 62.4%. The permeability coefficient is increased 234 times, the experiment has obtained the better extraction effect, has provided the theory and the technical foundation for the similar condition gas drainage.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TD712.6

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