General introduction on drilling techniques used in China’s First Deep Scientific Drilling Well CCSD-1

Abstract：This paper introduces the operation of China′s first deep hole, hard rock continuous coring project, CCSD-1 drilling project, concerning the drilling technical design, hole structure and casing program , as well as the techniques used in core drilling, hole reaming and directional drilling. In addition, the drilling process of CCSD-1 and the technical problems encountered in drilling and the measures adopted to solve the problems are described, and the main technical and economic indices are presented. Many special and new drilling technologies have been used in the drilling operation of CCSD-1, and high-efficiency, good-quality and low-cost drilling results have been achieved.