关键词：煤层气参数井；钻井；防斜；取心 [gap=476]Key words：parameter well for coalbed methane；well drilling；deviation preventing；coring
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本文主要论述了空气潜孔锤跟管取心钻进规程。
This paper discusses the procedures of DTH hammer and core drilling with casing.
利用钻井取心分析化验结果和粒度中值，计算地层束缚水饱和度。
We use analyzed results of drill cores and median grain diameter to compute bound water saturation of formation.
基岩钻探方法以采取普通硬质合金清水回转垂直取心钻进，覆盖层采用干钻。
For bedrock drilling ordinary hard alloy driller can be adopted for vertical core-drilling with the addition of clear water during rotation. for overburden dry drilling process can be adopted.
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