摘要
针对低透煤层穿层钻孔抽采难题,提出预置导向槽定向水力压穿增透的新技术,利用导向槽和导向槽钻孔周围的控制钻孔的共同定向作用对导向槽钻孔进行定向水力压裂,导向槽钻孔与控制钻孔之间的煤体压穿形成贯穿裂隙并通过高压水携带出大量煤屑,有效地实现煤层卸压和增加煤层透气性。研究了定向水力压穿的定向机理,阐述了导向槽定向水力压穿增透技术及工艺。现场应用表明:应用预置导向槽定向水力压穿增透技术后瓦斯抽采有效影响范围扩大1倍,钻孔瓦斯抽采量增加3.87倍,减少了65%的钻孔工程量,瓦斯抽采效率显著提高。
In view of the problem of gas drainage from holes through coal in the low permeability coal seam, a new per- meability improvement technology of directional hydraulic penetration by guided groove was put forward. The direction- al hydraulic fracturing of guided groove hole directed by guided groove and control hole, the coal between guided groove hole and control hole was penetrated, and took coal out by high pressure water, made the hole controlled coal loose stress, and improved the coal permeability effectively. The directional hydraulic mechanism was put forward and analyzed. Permeability improvement technology of directional hydraulic penetration by guided groove was described and studied in detail. The in-situ experimental results show that gas drainage scope rise more than 1 time, the hole flow increases by an average of 3.87 times ,boreholes engineering reduce 65%.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2012年第8期1326-1331,共6页
Journal of China Coal Society
基金
国家"十二五"大型油气田及煤层气开发科技重大专项资助项目(2011ZX05041-003)
"十二五"国家科技支撑计划资助项目(2012BAK04B01)
关键词
导向槽
定向水力压穿
增透
瓦斯抽采
guided groove
directional hydraulic penetration
permeability improvement
gas drainage
