水平井是实现煤层气高效开发的关键技术，为了优化水平井井型及配套钻井技术，提高煤层气井产量，基于煤层气排水降压采气的基本开发原理，提出了煤层气水平井井型和钻井工艺设计的基本原则，研究了各类煤层气水平井井型的优点和缺点，并针对高效水平井井型提出了配套钻井工艺优化方法。研究结果表明：水平井井型和钻井工艺优化应遵循便于排水降压、增加产气面积、力求井眼稳定和走低成本道路的原则；V型井、Ｌ型井与其他井型比，共用或取消排采直井，大幅降低了成本；从多分支井到单支井实现了套管、筛管完井，实现了水平井井眼支撑和重入，增强了稳定性，实现了增产措施应用；从多分支到单支压裂，保持了较大的产气面积；L型水平井是未来煤层气水平井的主要井型，但由于排采工艺不过关， 常规地面抽采L型水平井不能大规模推广，Ｖ型水平井是目前最为高效、适宜排采的水平井井型，但采动区L型水平井不需要排水降压则是煤矿瓦斯抽采的有效技术，可以大规模推广。钻井工艺由三开变为二开，一开采用φ444.5 mm大钻头，水平井眼直径由139.7 mm增加至339.7 mm，提高了水平井日产气量。通过直斜段固井技术，实现了水平煤层段不固井和筛管、套管完井，为保护和改善水平段储层渗透率奠定了基础，该工艺技术在沁水盆地南部和鄂尔多斯盆地东缘试验获得了较好的效果。

Horizontal well is the key technology for the efficient development of CBM.In order to optimize the horizontal well types and related drilling technology and increase the production of CBM wells，based on the basic development principles of coalbed methane drainage and pressure reduction gas production of CBM development，the basic optimization principle of CBM horizontal well was put forward，the advantages and disadvantages of all types of CBM horizontal well were studied，and an optimized drilling process methods was proposed for efficient horizontal well types.The results show that the optimization of well types and drilling processes should follow the following principals such as facilitating water drainage and depressurization，increasing the gas-production area，boosting the stability of borehole and cutting down the cost.V-type wells，L-type wells were compared with other well types，sharing or eliminating vertical wells，which greatly reduced costs；.from multi-branch wells to single wells，casing and screen completions were achieved，and horizontal wellbore support was achieved..With the variation from multi-branch to stimulated single branch type，a large gas production area was maintained.L type well will be the promising type in the future，but due to the poor drainage technology of L-type horizontal wells，V-type horizontal wells were the most efficient and suitable horizontal well type at present.It is an effective technology for coal mine gas drainage，which can be promoted on a large scale..The drilling process was changed from three to two，and a large ϕ444.5 mm drill bit was adopted，resulting the diameter of horizontal borehole increase from 139.7 mm to 339.7 mm，which improved the gas production greatly.Through the straightslope cementing technology，the completion of the horizontal coal seam without cementing and sieve tube and casing completion was achieved，which laid the foundation for protecting and improving the reservoir permeability in the horizontal section.This process technology was used in the southern Qinshui Basin and the eastern margin of Ordos Basin，and better results were obtained.