公开(公告)号：EP3390849A1

公开(公告)日：2018-10-24

申请号：EP16787957.6

申请日：2016-10-04

申请人： Weatherford Technology Holdings, LLC

发明人： REINHARDT, Paul Andrew

IPC分类号： F16C33/78 ,  F16J15/44 ,  E21B33/08

CPC分类号： E21B33/085 ,  E21B3/00 ,  F16C19/06 ,  F16C19/28 ,  F16C19/54 ,  F16C33/76 ,  F16C33/7893 ,  F16C2352/00 ,  F16J15/441

摘要： A rotating control device (RCD) which partitions the rotating speed of an inner barrel relative to a rotary and stationary seal via a roller bearing assembly. The roller bearing assembly causes the rotary seal to rotate at near half the speed, or portion of the speed thereof, of the inner barrel. Alternatively, a rotary seal assembly is rotatable by frictional contact with the inner barrel, and a stationary seal assembly is in frictional contact with the rotary seal assembly to prevent the rotary seal assembly from rotating at the same speed as the inner barrel. The speed differential between the inner barrel and the rotary seal, as well as between the rotary seal and the stationary seal is reduced by nearly half, which reduces wear and increases performance life of each seal.