中国煤炭
中國煤炭
중국매탄
CHINA COAL
2015年
5期
120-123
,共4页
低透气性煤层%放顶煤开采%地面钻井%瓦斯抽采%采空区瓦斯%预警次数
低透氣性煤層%放頂煤開採%地麵鑽井%瓦斯抽採%採空區瓦斯%預警次數
저투기성매층%방정매개채%지면찬정%와사추채%채공구와사%예경차수
low permeability coal sean%top-coal caving mining%ground boreholes%gas drain age%gas in goaf%number of warning
余吾煤业公司采用放顶煤开采技术,针对低透气性煤层提出了地面钻井抽采采空区瓦斯技术,设计了防剪切破断井身结构和最优布井位置,优化了钻井设计方案.工程实践结果表明,地面钻井单井最长抽采期为57 d,纯瓦斯抽采流量最大值为12.94 m3/min,单井累计抽采纯瓦斯39.31×104 m3,上隅角平均预警次数由抽采前8.3次降至1.03次,显著降低了井下瓦斯超限频率,保证了矿井安全高效生产.
餘吾煤業公司採用放頂煤開採技術,針對低透氣性煤層提齣瞭地麵鑽井抽採採空區瓦斯技術,設計瞭防剪切破斷井身結構和最優佈井位置,優化瞭鑽井設計方案.工程實踐結果錶明,地麵鑽井單井最長抽採期為57 d,純瓦斯抽採流量最大值為12.94 m3/min,單井纍計抽採純瓦斯39.31×104 m3,上隅角平均預警次數由抽採前8.3次降至1.03次,顯著降低瞭井下瓦斯超限頻率,保證瞭礦井安全高效生產.
여오매업공사채용방정매개채기술,침대저투기성매층제출료지면찬정추채채공구와사기술,설계료방전절파단정신결구화최우포정위치,우화료찬정설계방안.공정실천결과표명,지면찬정단정최장추채기위57 d,순와사추채류량최대치위12.94 m3/min,단정루계추채순와사39.31×104 m3,상우각평균예경차수유추채전8.3차강지1.03차,현저강저료정하와사초한빈솔,보증료광정안전고효생산.
In view of low permeability and the technical conditions of coal occurrence and top-coal caving of Yuwu Coal Mining Company,the ground drilling technique for the gas drainage in goaf was put forward,the anti-shear-fracture borehole and the optimal location of boreholes were designed,the drilling design scheme was optimized,and the engineering practice was carried out. The results show that the longest drainage is 5 7 days for single borehole from ground,and the maximum drainage rate is 12.94 m3/min.Furthermore,the total flow of pure gas for single bore-hole was 39.31×104 m3 ,the average number of warning in the upper corner was decreased from 8.30 before drainage to 1.03,significantly reducing the overrun frequency of underground gas, ensuring the safe and high-efficient production in coal mine.
