煤炭工程 ›› 2025, Vol. 57 ›› Issue (2): 103-111.doi: 10. 11799/ ce202502015

• 生产技术 • 上一篇    下一篇

松软煤层深孔定向--一体化增透促抽技术

李高健栗海滔   

  1. 山西长平煤业有限责任公司山西 晋城 048000

  • 收稿日期:2024-04-16 修回日期:2024-07-16 出版日期:2025-02-10 发布日期:2025-04-28
  • 通讯作者: 李高健 E-mail:yxyxyx20242024@163.com

Deep directional borehole “drilling-punching-protection” technology for permeability enhancement in gas extraction of soft coal seam

  • Received:2024-04-16 Revised:2024-07-16 Online:2025-02-10 Published:2025-04-28
  • Contact: Gaojian LI E-mail:yxyxyx20242024@163.com

摘要:

为在松软煤层中实现精准、高效、稳定的瓦斯抽采,针对松软煤层深孔钻进轨迹漂移大、透气性低抽采效果差、钻孔易塌孔报废率高等难题,提出松软煤层深孔定向--一体化增透促抽技术。该技术通过滑动钻进和复合钻进相结合的方式实现定向钻进工艺,通过水力冲孔工艺优化煤体应力环境实现增透促抽,通过筛管护孔工艺为孔壁提供一定支撑保证瓦斯抽采通道。工程实践表明:在松软煤层中实施深孔定向--一体化增透促抽技术,单孔最大总进尺达1942m,为保障精准抽采奠定了基础;最长稳定抽采时间超450d,单孔累计抽采瓦斯量超10m3,护孔率最大达92.6%,实现了全孔段护孔,突破了松软煤层抽采区域不精准、抽采效果差和效率低等难题,实现了松软煤层深孔精准、高效、稳定抽采瓦斯。

关键词:

定向钻进 , 水力增透 , 筛管护孔 , 煤层增透 , 瓦斯促抽

Abstract:

In order to achieve accurate, efficient and stable gas drainage in soft coal seams, in view of the problems of large drift of deep borehole drilling trajectory in soft coal seams, low permeability, poor drainage effect, and high scrapping rate of boreholes that are easy to collapse, Deep borehole directionally integrated technology, "drilling-punching-protection " to enhance permeability and promote drainage in soft coal seam was proposed. The technology realizes the directional drilling process through the combination of sliding drilling and composite drilling, changes the stress environment of the coal body through the hydraulic punching process to achieve enhanced permeability and promotes drainage, and provides a certain support for the borehole wall through the screen tube protection technology to ensure gas drainage mining channel. On the basis of directional drilling technology theory, hydraulic punching enhances permeability mechanism, borehole collapse failure characteristics and influencing factors, the technical equipment and process were introduced, and the key parameters of the "drilling-punching-protection" integrated technology were simulated and studied, and the "drilling-punching-protection" integrated enhance permeability and pumping promotion tech-nology was applied in Shanxi Changping Coal Industry Co., Ltd. Engineering practice shows that: in the soft coal seam, the deep borehole directional "drilling-flushing-protection" integrated anti-reflection enhancement and drainage technology is implemented, and the maximum total footage of a single borehole reaches 1942 m, which lays the foundation for ensuring accurate drainage; the longest stable drainage The time exceeds 450 days, the cumulative amount of gas drainage in a single borehole exceeds 100,000 m3, and the borehole protection rate reaches a maximum of 92.6%, realizing the borehole protection of the entire borehole section, breaking through the inaccurate drainage area of soft coal seams, poor drainage effect and low efficiency and other difficult problems, realizing the precise, efficient and stable gas extraction from deep boreholes in soft coal seams.

中图分类号: