液态CO_2压裂技术在煤层气压裂中的应用

Application of Hydraulic CO_2 Fracturing Technique in Coalbed Gas Fracturing

煤层气是一种非常规天然气资源。煤层气储层与常规天然气储层相比具有很大的差异。煤层通常以多个煤层组形式存在,各组之间相距的距离不等,这一特征加上煤岩本身的一些特性,使得煤层压裂与常规储层压裂之间存在一些差异。文章介绍了液态CO2压裂技术的原理、优缺点以及工艺技术特点,对利用液态CO2施工的步骤及效果进行了对比分析,建议在煤层气压裂中有针对性地利用该项技术。

Coalbed gas is a kind of non-conventional natural gas resource .The difference is exist between coalbed gas reservoir and conventional reservoir .Coalbed gas is always exist in different organizations, the distance between different compositions are not equal. This characteristic added itself characteristic of coal rock make the hydraulic fracture treatment be different from conventional hydraulic fracture treatment. This paper introduces the theory, the pros and cons, as well as technique characters of hydraulic CO2 fracturing treatment, and compares and analyzes the construction procedure and the effect of hydraulic CO2 fracturing, and suggests this kind of technique can be apply in coal bed methane reservoir fracturing treatment.