DRILL STRING TUBULAR COMPONENT

摘要

A drill string tubular component for use in an oil or gas well, in the form of a tubular having a central bore and a mechanism for mobilising drill cuttings comprising at least one radial impeller (30) configured to apply radial thrust cuttings passing it, the radial impeller being located between first and second axial impellers (10, 20) configured to apply axial thrust to the fluids in opposite directions. Typically helical components of the first and second axial impellers extend in respective opposite directions, typically toward the radial impeller. Fluids are thus diverted radially away from the outer surface of the tubular component, and thereby enter a more turbulent region of the annulus, there reducing the tendency of the drill cuttings to settle out of suspension.

主权项

1. A drill string tubular component in the form of a tubular having a central bore extending along an axis of the tubular, and two ends, the tubular component having an end connector at each end for connection of the drill string tubular component into a drill string for use in drilling a wellbore into a formation, the tubular component having a mechanism for mobilising drill cuttings in an oil or gas well, wherein the mechanism comprises:
at least one radial impeller in the form of a radial projection extending from the tubular component, the radial projection being configured to apply a radial thrust to the flow of cuttings in the drilling fluid passing through the annulus between the tubular and the hole, so that the cuttings passing the radial projection are urged in a radial direction away from the outer surface of the tubular component; and first and second axial impellers in the form of radial projections extending radially from the tubular component, the first and second axial impellers being provided at axially spaced apart locations on the tubular component with respect to the radial impeller such that the radial impeller is located axially between the axial impellers, the axial impellers being configured to apply axial thrust to the fluids passing through the annulus between the tubular and the hole, and wherein the direction of axial thrust applied to the fluid by the first axial impeller is opposite to the direction of axial thrust applied to the fluid by the second axial impeller.