Abstract: In order to speed up the development process in Nanpu 1-3 artificial island,high-inclination directional drilling was investigated.According to anti-collision design requirements and distribution characteristics of well location,dense cluster well trajectories were designed.In view of strong water sensitivity,salt sensitivity and basalt collapse or leakage in this block,a low filtration drilling fluid,with KCl filming and strong sealing property,was selected based on the theory of film sealing;after analyzing basalt thickness in drilled wells,a highly efficient PDC bit was selected to work together with PDM tools.Field application showed that the comprehensive high inclination directional drilling technologies mitigated the risk of wellbore collision and complexities like tight hole,pipe sticking in the drilling at Nanpu 1-3 artificial island,the drilled wells had an average hole enlargement rate of less than 8%,and all were put into production at once.Directional drilling technologies provide engineering and technical support for exploration and development of Nanpu 1-3 artificial island.