煤层气又称作煤层瓦斯，是近20年来在世界上崛起的新型能源，是一种以吸附状态赋存于煤层中的非常规天然气，在我国埋深2000m以浅的煤层气资源量为31.46×1012m3，与常规天然气储量相当。近期的勘探数据显示，在韩城目标区储藏了大量煤层气，但是由于研究区存在煤储层低压、低渗、低饱和及高吸附性的特点，使广泛使用的直井难以取得良好的商业化勘探开发价值。因此需要在研究韩城地区煤储层特征的基础上，结合现有水平井施工经验，探索出适合研究区煤储层的煤层气水平井钻井工艺。 首先，本文从韩城地区煤层气储层分析出发，通过对该区煤层气性质和压力特征、储层的物性和孔隙结构的研究，为钻井过程中的储层损害机理分析提供了论据，为钻井的设计和施工提供了理论支撑。其次，在总结分析区水平井失败和其他地区水平井经验的基础上，对研究区煤层气水平井失败的关键因素，即煤储层段煤岩失稳进行了分析，并提出了解决办法。第三，在研究分析国内外水平井钻井工艺技术的基础上，特别是晋城煤层气水平井钻井工艺技术的基础上，对研究区水平井钻井从以下几个方面进行研究：井身类型选型；轨迹设计与计算；钻具选配及钻进参数的确定；轨迹控制的方法；储层保护方案的确定。 本文为研究区的水平井的设计提供了理论依据，也为水平井钻井工艺在韩城地区的有效利用提供了技术支持，对提高煤层气产量起到了积极的推动作用。

Coalbed Methane(CBM) , namely Coalbed Gas, is a new-born energy source in recent 20 years in the world. It is unconventional natural has which exists in coalbed by adsorptive state. In our country, the resource of CBM which depth low than 2000m is about 31.46×1012m3, which is the same quantity as nuatural gas’s reserves. The recent exploration statistics tells，in HanCheng target area,there is a great number of CBM stored in coalbed. But because of coalbed’s low pressure, low penetration, low saturation and high absorption, vertical well widely used hardly reaches its expected business value on exploration.. Therefore,in addition to investigation of HanCheng coalbed characteristics, have to combined with current horizontal well project experiences，we should develop the most proper coalbed gas horizontal well drilling technology . First,this article starts with the analysis of HanCheng area coalbed，studied on coalbed gas’s characteristics and pressure , analyzed reservoir property and pore structure, given proofs to support formation damage analysis and for drilling design and construction.Then, on the basis of worldwide horizontal well techniques study，especially JinCheng’s techniques，this article mainly investigates research techniques for HanCheng area，which contains：confirming research area horizontal well’s well body structure; design and calculation of path，drilling tool choices and matching drilling parameters，accord to different part of well given ways to control path, stabilizing borehole， and reservoir protection，etc. This paper supports the Horizontal Well design in research area，and supports the efficient use of horizontal well drilling technology in HanCheng,actively stimulates the output of coalbed gas.