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: - a radial impeller comprising one or more radial projection(s) extending from the tubular component, the radial projection(s) of the radial impeller being configured to apply a radial thrust to the flow of cuttings in the drilling fluid passing through an annulus between the tubular and the wellbore, so that the cuttings passing the radial projection(s) are urged in a radial direction away from the outer surface of the tubular component; and - first and second axial impellers each comprising a plurality of circumferentially spaced radial projections (11, 21) 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 wellbore, 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, the first axial impeller being at a downhole end of the tubular component and each of the plurality of radial projections of the first axial impeller having a helical part at its downhole end extending helically around the tubular component, and the second axial impeller being at an uphole end of the tubular component and each of the plurality of radial projections of the second axial impeller having a helical part at its uphole end extending helically around the tubular component, characterised in that: each of the plurality of radial projections of the first axial impeller comprises an axial part at its uphole end extending parallel to the axis of the tubular, circumferentially adjacent radial projections of the plurality of radial projections of the first axial impeller defining channels between them with a floor of the channels generally parallel to the axis of the tubular; and each of the plurality of radial projections of the second axial impeller comprises an axial part at its downhole end extending parallel to the axis of the tubular, circumferentially adjacent radial projections of the plurality of radial projections of the second axial impeller defining channels between them with a floor of the channels generally parallel to the axis of the tubular. - a radial impeller comprising one or more radial projection(s) extending from the tubular component, the radial projection(s) of the radial impeller being configured to apply a radial thrust to the flow of cuttings in the drilling fluid passing through an annulus between the tubular and the wellbore, so that the cuttings passing the radial projection(s) are urged in a radial direction away from the outer surface of the tubular component; and - first and second axial impellers each comprising a plurality of circumferentially spaced radial projections (11, 21) 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 wellbore, 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, each of the plurality of radial projections of the first axial impeller comprises an axial part at its uphole end extending parallel to the axis of the tubular, circumferentially adjacent radial projections of the plurality of radial projections of the first axial impeller defining channels between them with a floor of the channels generally parallel to the axis of the tubular; and each of the plurality of radial projections of the second axial impeller comprises an axial part at its downhole end extending parallel to the axis of the tubular, circumferentially adjacent radial projections of the plurality of radial projections of the second axial impeller defining channels between them with a floor of the channels generally parallel to the axis of the tubular.