LUBRICATED MODULAR BEARING UNIT FOR A ROTATING CONTROL DEVICE, ROTATING CONTROL DEVICE ADAPTED TO A WELL HEAD, AND METHOD FOR VEDARTUBES PASSING THROUGH A ROTATING TABLE, AND ENTERING AND EXITING A WELL

摘要

lubricated modular bearing unit for a rotary control device, rotary control device adapted to a wellhead, and method for sealing pipes through an operating hole in a rotary table, and in and out of a well, a rotary flow head has a lubricated bearing unit for isolating bearing elements from pressure well fluids. the bearing unit, having a rotating cylindrical sleeve, bearing elements and two sealing assemblies, is secured within a stationary housing mounting hole by a retainer plate accepting a plurality of circumferentially spaced hex head cap screws. an upper part of the stationary housing. each sealing assembly has at least one sealing member having a body, an annular cavity, an inner sealing surface, and a radially outwardly extending flange when axially compressed. a load ring fitted in the annular cavity pushes the inner sealing surface radially inwardly to sealably seal the rotating cylindrical sleeve. the inner sealing surface further includes first and second sealing surfaces and a debris channel therebetween.