73··高瓦斯矿井顺层长钻孔施工工艺改进研究曹志刚1刘俊2(1.国家能源集团新疆能源有限责任公司,新疆乌鲁木齐830027;2.中煤科工集团重庆研究院有限公司,重庆400037)摘要针对乌东煤矿顺层钻孔施工过程中发生卡钻、顶钻及排渣不畅导致钻孔不能正常施工的情况,通过现场考察及理论分析后可知,造成喷孔和卡钻的主要原因是钻杆使得钻孔孔径变小,从而影响了瓦斯和煤粉颗粒的排出,使得内部压力变大。内外形成了压强差使得瓦斯和粉尘颗粒向外喷出,形成喷孔和卡钻,导致钻孔施工深度浅。通过针对性的改进钻孔施工工艺,使钻孔施工长度显著增加。研究结果对乌东煤矿和其他类似矿井今后的顺层长钻孔施工具有重要的指导作用。关键词顺层钻孔喷孔顶钻钻进工艺瓦斯抽采ResearchonimprovementofconstructiontechnologyoflongdrillingalongthelayerinhighgasmineCAOZhigang1LIUJun2(1.NationalEnergyGroupXinjiangEnergyCo.,Ltd.,UrumchiXinjiang830027,China)AbstractInresponsetothesituationthatthedrillholecouldnotbeconstructednormallyduetothejamming,topdrillingandpoorslagdischargeduringthedrillingprocessintheWudongcoalmine,themainreasonforthesprayholeandjammingisthatthedrillpipemakestheholediametersmaller,whichaffectsthedischargeofgasandcoaldustpar-ticlesandmakestheinternalpressurebigger.Thepressuredifferencebetweeninsideandoutsidemakesthegasanddustparticlessprayoutward,resultinginsprayholesandstuckholes,whichleadstoshallowdrillingdepth.Byimpro-vingthedrillingprocess,thedrillinglengthwassignificantlyincreased.TheresultsofthestudywillbeanimportantguideforthefutureconstructionoflongdrillholesinWudongcoalmineandothersimilarmines.Keywordsbeddingdrillingjetholetopdrillingdrillingtechnologygasdrainage0引言乌东煤矿为高瓦斯矿井,主采43#、45#煤层,均为急倾斜特厚煤层,平均煤层倾角45°。随着矿井开采水平的延伸,开采煤层的瓦斯含量和压力都不断增加,使得瓦斯灾害成为影响乌东煤矿安全的第一因素。伴随着煤层瓦斯压力的不断递增,往往会造成钻孔施工困难,甚至出现钻孔卡钻、喷孔现象,造成钻孔无法施工达到设计要求,导致回采工作面出现大面积的空白带和影响掘进工作面正常掘进。钻孔不能按照设计要求完成,直接影响采掘接替工作的开展。乌东煤矿北采区在钻孔施工前期,煤...