摘要
针对寺河煤矿西三集中回风巷掘进过程中工作面瓦斯浓度高、超前钻孔预抽效果差的问题。提出了通过地面煤层气井压裂井下定向长钻孔增加煤层透气性技术并进行了现场试验。该技术是利用井下掘进岩巷所揭露的地面煤层气井作为地面与井下连接通道,采用高压油管作为压裂液流动管路,在地面采用油气井压裂设备对井下定向长钻孔进行压裂,然后再在井下针对压裂控制范围施工瓦斯抽放钻孔。通过现场实践表明,地面钻井抽采可有效提升井下定向钻孔的抽采效率,压裂后其抽采流量较压裂前可增长4倍以上,回采面的回采进度基本可提高3倍以上,有效提升了工作面的瓦斯治理能力和煤炭回采效率。
To address the problems of high gas concentration and poor pre-drainage performance of advanced boreholes during roadway excavation in the No.3 West Centralized Return Airway of Sihe Coal Mine,a new technique that enhances coal seam permeability by fracturing underground directional long boreholes in surface coalbed methane wells is proposed and field-tested.This method utilizes existing coalbed methane wells exposed by underground roadway excavation as communication channels between the surface and underground.High-pressure tubing is used to transport fracturing fluid,and surface oil and gas well fracturing equipment is employed to fracture the underground directional boreholes.Gas drainage boreholes are drlled within the effective fracturing zone.Field practice shows that this method significantly improves the extraction efficiency of underground directional boreholes.Post-fracturing drainage flow rates increased by more than four times compared to pre-fracturing levels,and the advancement rate of the working face improved by over three times.This technique effectively enhances gas control capacity and coal recovery efficiency in the working face.
作者
段忻岐
DUAN Xinqi(Dongda Energy Co.,Ltd.,Jinneng Holding Shanxi Coal Sales Group,Shanxi 048006)
出处
《中国煤层气》
2025年第2期12-16,共5页
China Coalbed Methane
关键词
压裂
煤层气井
定向长钻孔
瓦斯
透气性
Fracturing
coalbed methane wells
long directional borehole
gas
permeability
