煤炭工程 ›› 2017, Vol. 49 ›› Issue (6): 114-116.doi: 10.11799/ce201706033

• 研究探讨 • 上一篇    下一篇

煤矿区煤层气地面钻井抽采方式及关键技术

李丹   

  1. .煤炭科学技术研究院有限责任公司矿山安全技术研究分院
  • 收稿日期:2017-01-03 修回日期:2017-02-18 出版日期:2017-06-09 发布日期:2017-06-20
  • 通讯作者: 李丹 E-mail:18511530097@163.com

Coal-bed Methane Drainage Mode and Key Technology with Surface Drilling Well in Coal Mining Area

LI Dan   

  • Received:2017-01-03 Revised:2017-02-18 Online:2017-06-09 Published:2017-06-20
  • Contact: LI Dan E-mail:18511530097@163.com

摘要: 简述了采前预抽、采中抽采和采空区抽采方式的技术特点及其理论基础。介绍了各种抽采方式的关键技术:采前预抽的关键技术主要有水平井钻进与压裂和智能高效排采技术|而采动井布井与井身结构优化及套管防护技术和采空区资源评估、井位优化及安全监测技术分别为采中抽采和采空区抽采的关键技术。最后指出精细地质导向模型的建立、软弱煤层压裂破裂与裂缝延展机理、压裂裂缝实时监测与煤矿井下现场观测技术以及采空区抽采的安全评价及资源评估等仍是地面钻井抽采所面临的主要问题和重点研究方向。

关键词: 煤矿区, 煤层气, 地面抽采, 钻井

Abstract: In recent years, coal-bed methane drainage technology by ground drilling in coal mining area in China has developed rapidly, in horizontal wells drilling and fracturing, well layout optimization of vertical well and "L" type well in mining area, well body structure optimization and casing protection, evaluation of coal-bed methane resources and well drilling technology in gob, drilling process optimization, safety monitoring of negative pressure drainage and other aspects have a significant technological breakthrough. The extraction technology by ground drilling is developed from a single pre extraction to a comprehensive extraction stage; include pre-drainage, pressure relief drainage and drainage in gob. In our country, the proportion of coal bed methane drainage by ground well in the total extraction volume is increased from 14% in 2009 to 24% in 2015, which increased by 17%. Finally put forward the establishment of fine geological guidance model, fracture mechanism and fracture extension mechanism in soft coal seam, real time monitoring of fracturing fracture, field observation technology in underground coal mine ,safety evaluation and resource evaluation of drainage in gob, is still the main problems and key research directions of surface drilling extraction

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