地面煤层气抽采效果评价指标初探

地面煤层气抽采是煤层气开发普遍采用的方式，主要以地面垂直井方式为主。建立地面煤层气抽采效果评价指标，有利于同一地区不同地面煤层气井、不同地区的抽采效果比较，也可为国内外抽采效果评价、不同抽采工艺效果比较提供参考手段。目前国内外地面煤层气抽采效果的评价及指标还不完善。本文通过收集晋城成庄区块主要煤层的储层参数和生产数据，采用新型储层模拟软件CBM-SIM进行不同井间距的产能预测，由此探讨地面煤层气抽采效果的有效评价指标。研究表明，评价指标可分为两类：一类是储层特征，主要包括气含量和储层压力；一类是煤层气资源特征，主要包括累计产气量、采收率、日最高产气量、稳产期日均产气量。

EVALUATION INDEX OF SURFACE EXTRACTION OF COALBED METHANE

Surface extraction is commonly used in coalbed methane, mainly through vertical holes. To establish an evaluation index of coalbed methane extraction effect can help compare the extraction effects in different holes in one area, or in different areas, and also worldwide and from different technologies. Currently, the evaluation and index needs optimization. This paper, based on reservoir parameters and production data in Jincheng Chengzhuang coal block, applies CBM-SIM software to predict the production in variable holes, and discusses the effective evaluation indexes. The results indicate that the indexes can be classified into two categories, one is reservoir features which include methane content and reservoir pressure, the other is coalbed methane features which include accumulated gas production, yield rate; daily maximum gas production, and stable daily production.