韩城地区煤层气多层合采开发效果评价

单一煤层的煤层气资源丰度通常都比较低，且各向异性特征显著，为了提高单井产能，常把纵向上彼此邻近、特征相似的多个煤层组合在一起，以合采的方式进行开发。通过理论分析层间差异下的多层合采煤层气井开发动态，并基于韩城地区3号、5号和11号煤储层特征，经过分析该地区煤层气多层合采井的排采实例，对多层合采井的开发效果进行了评价。结果表明:低丰度煤层气藏的开发宜采用多层合采方式进行，但需注意多层合采的时机与顺序、水层倒灌与煤粉产出问题，应在生产过程中调整措施。 

Multi-layer production evaluation of coalbed methane wells in Hancheng area

Coalbed methane reservoir is in low abundance and anisotropic. In order to improve the well productivity, some thin layers are usually developed together, which are adjacent to each other vertically and have the similar characteristics. The multi-layer CBM wells' production performance under the condition of interlayer differences has been studied using the reservoir parameters of seams No.3, 5, 11. Then the development effect has been evaluated according to the field data. The results show that multi-layer development is favorable for low-abundance coalbed methane wells. But there are three problems:the timing and sequence of multi-layer production, water flood backward and pulverized coal. Production measures should be regulated during production.