Patent ID: 8286734

Claim:
A system for forming a borehole using a rotatable tubular, the system comprising: a housing having a height and disposed above the borehole, said housing having a lateral port; a bearing assembly having an inner member and an outer member and being positioned with said housing, one of said members rotatable with the tubular relative to the other said member and one of said members having a longitudinal passage through which the tubular may extend; a seal having a height to sealably engage the rotatable tubular with said bearing assembly; a plurality of bearings disposed between said inner member and said outer member; a flange having an outer diameter and a port, wherein said housing lateral port communicating with said flange port; a conduit disposed between said housing port and said flange, wherein said conduit having a width perpendicular to a height, and wherein said conduit width being greater than said conduit height at said housing port; a lower member above the borehole; and an attachment member for attaching said housing to said lower member, wherein said housing lateral port is in alignment with said seal; and wherein said bearing assembly partially blocks said lateral port.