公开(公告)号：US20170122055A1

公开(公告)日：2017-05-04

申请号：US14932206

申请日：2015-11-04

申请人： Freudenberg Oil & Gas, LLC

发明人： Phillip D. EMBURY

IPC分类号： E21B33/03 ,  F16J15/3264 ,  F16J15/3232 ,  E21B3/00 ,  F16J15/18

CPC分类号： E21B33/03 ,  E21B3/00 ,  E21B33/085 ,  E21B2033/005 ,  F16J15/18 ,  F16J15/3232 ,  F16J15/3264 ,  F16J15/3268 ,  F16J15/3284

摘要： A wash pipe stuffing box sealing assembly includes a wash pipe stuffing box with a mandrel sleeve disposed in a bore there through. A plurality of stuffing box adapter rings are disposed in the wash pipe stuffing box and surrounding the mandrel sleeve. An annular seal ring is disposed between a pair of the adapter rings, and includes an annular seal body made of a first material including a radially outer portion and an annular radially inner portion extending radially inward from the outer portion. The inner portion includes an inner surface with an annular contact lip portion and an annular recess portion disposed adjacent to the annular contact lip portion. A secondary sealing ring made of a PTFE (Polytetrafluoroethylene) is disposed in the annular recess portion of the inner portion of the annular seal body and creates additional sealing action from a thermally stable, low friction coefficient material.