公开(公告)号：EP2326790B1

公开(公告)日：2018-11-21

申请号：EP09808514.5

申请日：2009-08-20

申请人： ExxonMobil Upstream Research Company

发明人： OZEKCIN, Adnan ,  JIN, HyunWoo ,  BIEDIGER, Erika, A. Ooten ,  BAILEY, Jeffrey, R. ,  GUPTA, Vishwas ,  ERTAS, Mehmet, Deniz ,  ELKS, William, C. ,  BANGARU, Narasimha-rao, Venkata

IPC分类号： E21B7/04 ,  E21B17/10 ,  C23C14/06 ,  C23C16/26 ,  C23C30/00

CPC分类号： E21B7/046 ,  C23C14/0605 ,  C23C16/26 ,  C23C30/005 ,  E21B17/1085

摘要： Provided are drill stem assemblies with ultra-low friction coatings for subterraneous drilling operations. In one form, the coated drill stem assemblies for subterraneous rotary drilling operations include a body assembly with an exposed outer surface including a drill string coupled to a bottom hole assembly or a coiled tubing coupled to a bottom hole assembly and an ultra-low friction coating on at least a portion of the exposed outer surface of the body assembly, wherein the coefficient of friction of the ultra-low friction coating is less than or equal to 0.15. The coated drill stem assemblies disclosed herein provide for reduced friction, vibration (stick-slip and torsional), abrasion and wear during straight hole or directional drilling to allow for improved rates of penetration and enable ultra-extended reach drilling with existing top drives.