煤层气开采技术应用现状及其改进

为解决我国煤层气平均采收率低的问题,从储层特征和开采技术2个方面进行了分析。在此基础上,探讨了不同开采技术与特定地质条件的开采技术适用性以及各种新型开采技术所具有的优势。研究结果认为,煤储层的＂低含气饱和度、低渗透率、低储层压力＂特征以及现行开采技术适用性差是我国煤层气采收率低的主要原因;套管（压裂）完井、超短半径水平井和多分支水平井综合运用应作为我国煤层气开采的主要模式。分析认为采用注入混合气体增产、多级强脉冲加载压裂、＂固氮酶＂、＂虚拟产层＂等各种新型开采技术来提高我国煤层气采收率,实现高效开采。

Application Status and Improvement of Coal Bed Methane Development Technology

In order to solve the low average drainage and recovery rate of the coal bed methane in China,the paper had an analysis on the reservoir features and mining technology.Based on the circumstances,the paper discussed the suitability of the different development method and the special geological conditions as well as the advantages of the each new development technology.The study held that "low content saturation,low permeability and low reservoir pressure" features of the coal reservoir and the poor suitability of the available development technology were the main two causes to the low drainage and recovery rate of the coal bed methane in China.The casing(fracturing) completion,ultra short radius horizontal well and multi branch horizontal well comprehensive operation could be the main modes of the coal bed methane development in China.The analysis held that the mixed gas injection for gas production increased,multi power pulse loading fracturing,nitrogenase,virtual production layer and each new development technology could be applied to improve the drainage and recovery rate of the coal bed methane in China and to realize the high efficient development.