Patent ID: 6109374
Filing Date: 2000-08-29
Classification: E21B

Abstract:
A stabilizing tool for drilling having a plurality of roller assemblies disposed in pockets about the surface of the tool, the assemblies each including at least one rotatable grinding roller disposed for frictional contact with the walls of a bore hole being drilled, said tool comprising:a fluid passageway formed axially through said tool for the flow of drilling fluid, said passageway having a first zone wherein the pressure of said fluid is relatively high and a second zone wherein said pressure is relatively low; andmeans for placing said passageway in fluid communication with the interior of each of said rollers, said placing means including first conduit means providing fluid communication between said first zone of relatively high pressure and the interior of said roller for the ingress of said fluid to said interior, and second conduit means providing fluid communication between the interior of said roller and said second zone of relatively low pressure for the egress of said fluid back to said passageway, said interior of each roller being sealed to prevent the ingress or egress of fluid other than through said first and said second conduit means.