我国注气驱替煤层瓦斯技术应用现状与展望

注气驱替煤层瓦斯技术的应用可以显著提高煤层瓦斯采收率,并具有环保性。基于国内外注气驱替煤层瓦斯发展状况及主要机理,从注气位置(地面和地下)、注气模式(自然涌出、负压抽采、只注不抽、边注边抽和间歇注气等)和注入气体种类(纯CO_2、纯N_2和混合气体等)等三个方面对比分析了我国注气驱替煤层瓦斯技术的应用现状。最后,结合注气驱替煤层瓦斯现阶段的发展现状,从低煤阶煤层气注气技术、多储层联合开采注气技术、深部煤层气注气技术、新型气体注气技术和多措施联合注气技术等五个方面对注气驱替煤层瓦斯技术进行了展望。

Present situation and prospect of coal seam gas recovery by gas injection technology utilization in China

Gas injection technology can significantly improve the gas recovery rate, and is friendly to the environment. Based on the development status and main mechanism of gas injection, present status of coal seam gas recovery by gas injection technology utilization in China are compared and analyzed in three aspects, including gas injection location (surface and underground), gas injection models (natural emission, negative pressure drainage, injection without drainage, injection with drainage and intermittent gas injection, etc.) and injected gas type (pure CO₂, pure N₂ and mixed gas, etc.). At last, combined with the development situation of gas injection technology, the following development prospects were proposed: the gas injection technology to low rank coal seam, the gas injection technology to recover multi reservoir, the gas injection technology to the deep coal seam, the gas injection technology with new gas type and the injection technology combined with other methods.