1983年地矿部勘探所在我队李楼矿床进行螺杆钻小口径定向钻进试验，经三年工作获得成功，取得了良好的效果。近二年我队又完工定向钻孔8个，中靶精度较高，地质效果好，技术效果喜人，经济效果明显。实验表明，受控定向孔设计的可靠性，直接关系到施工的成败，必须认真对待。现就定向孔设计问题谈几点认识。 In 1983, the Exploration and Production Department of the Ministry of Geology and Mineral Resources conducted a small diameter drilling test of screw drilling in Li Lou deposit of our team. After three years of work, it achieved great success. Nearly two years my team has completed directional drilling 8, targeting a higher accuracy, good geological effects, technical results gratifying, economic effect is obvious. Experiments show that the reliability of the design of controlled directional holes is directly related to the success or failure of construction and must be taken seriously. Now on the design of directional holes to talk about some understanding.