注气提高煤层气开发效果适应性分析

Analysis of the Adaptability for Increasing Production of Exploitation Coal Bed Methane by Gas Injection

详述了煤层气的赋存状态、吸附与解析机理,分析了注气提高采收率的3个机理:即恢复提高气藏产能、吸附置换及驱替作用。在此基础上,对比了注气前后煤层气产量的变化,指出了注入N2和CO2对煤层气开发的影响,最后给出了煤层气注气开发方式及实施方法,为注气提高煤层气开发效果矿场应用提供了理论与技术支持。

In the paper, occurrences, adsorption, desorption mechanism of coal bed methane are described, three mechanism via gas injection to increase coal bed methane recovery are analyzed,firstly, improve gas recovery capacity; secondly, adsorption replacement; thirdly, displacement function. Furthermore, the production change of coal bed methane before and after adopt to gas injection are compared, and the impact on exploitation to inject CO2 and N2 are pointed out, finally with gas injection to development and implement method for coal bed methane exploitation are given, theoretical and technical support for increasing production of exploitation coal bed methane by gas injection in field application are provided.