密封巷道—钻孔联合预抽瓦斯技术研究

发布时间：2018-03-07 02:04

本文选题：瓦斯抽采　切入点：水封钻场　出处：《辽宁工程技术大学》2013年硕士论文　论文类型：学位论文

【摘要】：影响钻孔瓦斯抽采浓度的关键问题是钻孔孔口的封孔质量,无论是本层抽采,邻近层抽采或采空区抽采,在保证孔内(孔底)有足够的瓦斯源的基础上,只有封孔质量好,孔口严密不漏气,才能抽出高浓度瓦斯,提高抽采效果。水封钻场是一种新型的瓦斯预抽采技术,它依据甲烷难溶于水的性质,钻孔不用封孔,用水将抽采巷道中的瓦斯与通风巷道隔开,避免漏入空气,从而保证了良好的密封性,能抽出高浓度的瓦斯。应用数值模拟、理论分析和现场工业试验相结合的方法,研究了应用水封钻孔技术抽采高浓度瓦斯的方法。利用数值分析理论,建立数学模型,编制数值模拟程序,研究瓦斯在水封钻场的流动规律。选取山西焦煤西山煤电集团公司杜儿坪矿北三盘区68305预抽巷为试验地点,进行了水封钻场抽采瓦斯试验研究,提出了水封钻场合理的施工工艺和技术方案。试验结果表明,水封钻场稳定抽采期间的瓦斯浓度在60%以上,最高浓度可达85%。同时,研究水封钻场的钻孔布置方式、抽采负压、试验区域的地质构造等因素对瓦斯抽采的影响规律。
[Abstract]:The key problem affecting the concentration of gas extraction in borehole is the quality of hole sealing at the hole opening. Whether it is the drainage of this layer, the drainage of adjacent strata or the extraction of goaf, the quality of sealing holes is good on the basis of ensuring that there are enough gas sources in the hole (bottom of the hole). In order to extract high concentration gas and improve the effect of drainage, the hole mouth is tight and not leaking gas. The water seal drilling field is a new type of gas pre-extraction technology. It is based on the property of methane insoluble in water, the borehole does not need to seal holes, the gas in the drainage roadway is separated from the ventilation roadway with water, and the air leakage is avoided, thus the good sealing property is ensured. High concentration of gas can be pumped out. By using the method of numerical simulation, theoretical analysis and field industrial test, the method of extracting high concentration gas by using water seal drilling technique is studied. The mathematical model is established by using the theory of numerical analysis, and the numerical simulation program is compiled. This paper studies the flow rule of gas in the water seal drilling yard. Taking 68305 pre-drainage roadway of North Sanpan District of Duerping Coal Power Group Company of Shanxi Coking Coal Xishan Coal Power Group Company as the experimental site, the gas extraction test of water seal drilling field is carried out. The reasonable construction technology and technical scheme of water seal drilling yard are put forward. The test results show that the gas concentration is above 60% and the highest concentration can reach 85. At the same time, the drilling arrangement of water seal drilling yard is studied, and the negative pressure is extracted. The influence of geological structure and other factors on gas drainage in the test area.
【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】：2013
【分类号】：TD712.6

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