Patent ID: 7823662

Claim:
A hydrocarbon recovery drill string apparatus, comprising: an elongated assembly within which a rotatable drill rod is received, the assembly comprising a longitudinal axis, a drill rod entrance end, and a drill rod exit end; the assembly comprising a tailcuttings diverter pipe proximate the drill rod exit end, the tailcuttings diverter pipe defining an initial fluid flow path of the tailcuttings from the longitudinal axis which is acute from the longitudinal axis; the assembly comprising a brush construction received about the drill rod, the brush construction havinq a plurality of brush bristles extending radially inward into contact with the rotatable drill rod downstream relative to tailcuttings flow of where the tailcuttings diverter pipe is received; a non-metallic drill rod retainer member encircling the drill rod adjacent the brush bristles to limit radial drill rod movement adjacent the brush bristles; and an elastomeric seal encircling the drill rod and received longitudinally between the brush bristles and the non-metallic drill rod retainer member.