乌鲁木齐矿区大倾角地层煤层气水平井技术研究

Technical study on horizontal coalbed methane wells in high dip strata in the Urumqi Mining Area

摘要:

准南煤田乌鲁木齐矿区是新疆煤层气勘探开发的重点区域，相比常规的丛式井，水平井作为一种成本不是很高但增产效果非常好的井型,已经越来越多地应用于矿区煤层气开发。但乌鲁木齐矿区具有地层倾角大、目标煤层结构复杂等特点，需要结合实际地质特征对水平井钻井技术进行优化和适宜性研究。结合水平井施工特点，开展了井壁失稳机理研究、低伤害钻井液体系研究和井身结构优化设计，并进行现场试验，取得了良好的效果。

Abstract:

The Zhunnan Coalfield Mining Area in Urumqi is the key area of coalbed methane exploration in Xinjiang Region. Compared with conventional cluster wells, horizontal wells have been used more and more in coalbed methane exploration due to its benefits of low cost and good yield-increasing effect. However, the Urumqi Mining Area has the characteristics of high dip and complex structured target coal seams. So it is necessary to optimize and adapt the horizontal well drilling technology to the local geological characteristics. In light of the horizontal well construction characteristics, research has been conducted on wellbore instability mechanism, low harm drilling fluid systems, and the optimization design of wellbore structure; and field tests were carried out with good effects.