根据水平井造斜段长、造斜率大、并底有一段较长的水平并段等特点，文章论述了水平并钻柱应具有的特点以及设计水平井钻柱的原则和方法。指出在设计水平并钻柱时，应把钻铤安装在垂直井段或井斜角不大的井段，而在大斜度井段和水平井段使用加重钻杆或普通钻杆。钻柱设计的顺序为：首先根据井眼轨迹及钻压等工作要求，以不失德为条件设计钻柱，最后对设计出的钻柱进行强度校核。 According to the length of the horizontal well, the slope is large and the slope has a long horizontal section. The paper discusses the characteristics of the horizontal well and the principle and method of designing the horizontal well. It is pointed out that in the design of the horizontal and the drill string, the collar should be installed in the vertical section or the section with small inclination, while the heavier or ordinary section should be used in the high-grade section and the horizontal section. The order of drill string design is as follows: Firstly, according to the requirements of wellbore trajectory and weight-on-bit, the drill string should be designed on the condition of not losing virtue, and finally the strength of drill string should be checked.