介绍了长裸眼中斜度定向井的钻井液体系及处理方案 ,以及润滑防卡、井眼净化和井壁稳定等 3个关键技术问题的解决方法。列举了 4口井的应用情况及钻井液性能。实践证明 ,所选择的钻井液工艺技术较好地满足了钻深 36 2 3m、井斜 49°、井底水平位移 12 2 9m、裸眼井段长达 32 2 4.5 m、裸眼斜井段长达 2 2 92 m的定向井对钻井液的要求。 This paper introduces the drilling fluid system and treatment scheme for the directional well in long-open-hole, as well as the solution to the three key technical problems such as lubrication anti-carding, wellbore purification and wellbore stability. The application of 4 wells and drilling fluid properties are listed. Practice has proved that the selected drilling fluid technology to better meet the drilling depth of 3623m, inclination of 49 °, the bottom of the horizontal displacement of 12 2 9m, open hole section up to 32 2 4.5 m, open-hole inclined section up to Drilling fluid requirements for 2292 m directional wells.