Application of extended-reach directional well drilling technology in PY10-8/5 Oilfield

Well PY10-8/5 is an extended reach well and it is a key and difficult project of CNOOC in the South China Sea. Its directional drilling is seriously restricted by surface anti-collision, whipstocking of surface large borehole, operation speed increase of long displacement sections with high hold angle and abrasion of down hole tools. In this paper, the technical difficulties of this direction well drilling project were analyzed thoroughly. Then, the technologies for dealing with these directional drilling difficulties were researched and optimized in reference to the direction well drilling technologies used in other extended reach well projects at home and abroad, especially the drilling experience in this block. And finally, the supporting technologies suitable for the directional well drilling of this extended reach well project were gradually developed by optimizing the trajectory and bottom hole assembly (BHA), adopting the rotary-steering drilling tools and simulating and real-time tracking and analyzing the operational engineering parameters. After these drilling technologies are applied in PY10-8/5 extended reach well project, the drilling is completed smoothly, efficiently and economically. The research results are of instructive significance to other projects.