Chongqing Research Institute,China Coal Technology and Engineering Group

煤矿区煤层气地面井采动区卸压抽采充分利用了煤层采动过程中的卸压增透效应,可有效抽采煤矿卸压瓦斯,但井身结构、布井位置等对地面井的抽采效果影响较大。介绍了煤矿区煤层气地面井采动卸压抽采技术的重大进展、应用效果和发展前景,重点分析了地面井优化设计关键技术取得的重大突破;同时,针对煤矿区煤层气中煤层气浓度变化范围大、波动大的特点,分析了体积分数低于30%的煤层气掺混发电、高于30%的煤层气含氧液化制作LNG产品的完整产业化方案及技术发展情况。已形成的集开发利用于一体的成套技术及完整产业链,将有助于提高我国煤层气抽采率和利用率,煤矿区煤层气地面井采动卸压抽采已经成为了煤层气开发领域一个重要的组成部分。

With a full tilization of pressure released and permeability improved effect in the mining process of seam,the coal seam methane surface well with pressur e released gas drainage in mining operation zone of coal mine area could effectively drain pressure released gas from coal mine.The well structure,well layout location and others would have high influences to the gas drainage effect of surface well. The paper introduced the major progress,application effect and development prospect of minin g pressure released drainage technology for coal seam methane surface well in coal mine area and analyzed significant breakthrough in key technology of optimized desig n for surface well.Meanwhile,according to high variation scope and high fluctuation features of coal seam methane density in coal seam methane of the coal mine area,the paper analyzed the integrated industrial plan and technical development condition of coal seam methane with a volume fraction under 30% for mixing power generation and the coal seam methane with a volume fraction over 30% for coal seam methane oxyenbearing liquidization to make LNG products.The completed technology and integrated industrial chain integrated with development and utilization could be favorable to promote coal seam methane drainage rate and utilization rate. The mining pressure releas ed gas drainage from coal seam methane surface well in coal mine area could be an important component part of coal seam methane development.

国家科技重大专项资助项目(2011ZX05040-004)；国家自然科学基金资助项目(51374236)；