Drilling technology for Zhuanghai 8Es-H5 extended-reach horizontal well

The beach of Dagang Oilfield has entered into a substantial stage of development since 2007. Being subject to surface conditions, the drilling-cluster-wells-on- artificial- island method is adopted to develop shallow-water oilfield in order to achieve high efficiency exploitation. During the recent two years, a lot of advanced extended -reach horizontal wells have been drilled (the maximum ratio of displacement to vertical depth is 3.92). Taking Zhuanghai 8Es-H5 well as an example, the advanced techniques and measures taken in the planning and drilling phases are introduced in this paper, including optimization of well structure and well path, prediction and control of torque and drag, accurate control of well trajectory, hole stabilizing and cleaning, running casing in long hold section with big inclination, monitoring of ECD (equivalent circulating density) in annulus, hole anti-collision, application of high quality drilling fluid. These techniques offer significant reference for planning and drilling of extended -reach horizontal wells.