大采高工作面筛管防治软煤层钻孔塌孔技术研究

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英文篇名：Research on Prevention and Control of Borehole Collapse in Soft Coal Seam with Screen Pipe in Large Mining Height Face 作者：王翔宇 英文作者：WANG Xiang-yu;Changzhi Co.,Ltd.of Shanxi Coal Transport and Marketing Group; 关键词：工作面筛管 ; 钻孔塌孔 ; 软煤层 ; 抽采量 英文关键词：working face screen;;borehole collapse;;soft coal seam;;extraction quantity 中文刊名：煤 英文刊名：Coal 机构：山西煤炭运销集团长治有限公司; 出版日期：2019-03-15 出版单位：煤 年：2019 期：03 基金：国家自然科学基金资助项目(51604126) 语种：中文; 页：9-12 页数：4 CN：14-1171/TD ISSN：1005-2798 分类号：TD712.6

摘要

针对中能煤矿2302大采高工作面正前方、巷道两帮应力集中段及局部构造应力集中段钻孔易出现塌孔问题,利用筛管进行护孔,以实现井下本煤层瓦斯高效预抽,通过现场试验,结果表明:当筛管的长度达到60 m时,煤层的单孔瓦斯抽采混合流量达到0. 134～1. 624 m3/min,平均单孔混合流量为0. 759 m3/min,瓦斯平均浓度基本稳定在12%左右;相比50 m长筛管钻孔瓦斯混合流量有小幅度升高但并不明显,瓦斯浓度与50 m长筛管基本相同,本着经济合理的原则,建议将筛管护孔长度定为50 m。
        Aiming at the problem of hole collapse in front of the working face,stress concentration section of two sides of roadway and local tectonic stress concentration section of 2302 large mining height working face in Zhong Neng coal mine,using screen pipe technology to realize efficient pre-drainage of gas in underground coal seam. Through field trials,the results show: when the length of screen pipe reaches 60 m,the mixed flow rate of single-hole gas extraction in coal seam reaches 0. 134 ～ 1. 624 m3/min,the average mixed flow rate of single-hole is 0. 759 m3/min,and the gas concentration is basically stable at about 12%; compared with the 50 m long screen pipe,the mixed flow rate of borehole gas increases slightly,but it is not obvious,and the gas concentration is basically the same as that of 50 m long screen pipe. Considering the economic and reasonable angle,it is suggested that the length of the screen pipe hole should be set at 50 m.

引文

[1]贾男.低透气性软煤层筛管护孔与CO2相变致裂增透技术联合应用[J].煤矿安全,2018(1):153-156.
    [2]宋海青.马堡煤矿15203工作面筛管防治构造带钻孔塌孔技术研究[J].能源技术与管理,2018,43(4):23-24.
    [3]王鹏,叶川,李阳.松软破碎煤层顺层孔全程下筛管护孔抽采技术研究[J].煤炭技术,2018,37(7):179-181.
    [4]孙新胜,王力,方有向,等.松软煤层筛管护孔瓦斯抽采技术与装备[J].煤炭科学技术,2013,41(3):74-76.
    [5]王四一,刘勇,董昌乐,等.筛管护孔工艺及装备在神华宁煤集团的应用[J].煤矿安全,2015,44(12):151-153.