National Oilwell Varco, L.p.

Grant Tfw

John Forester Price

Andrei M Muradov

Frank J Carlin

Michael Joseph Jellison

Guillaume Plessis

Stephen C Hain

Andrei Muradov

A hole cleaning joint for a drill string is deployed into a wellbore penetrating a subterranean formation. The hole cleaning joint includes a tubular body connectable to the drill string and a hole cleaning section positionable about the tubular body. The hole cleaning section has an outer surface engageable with a wall of the well bore. The outer surface has spiral grooves extending therein defining blades therebetween, and an uphole end and a downhole end with a spiral cavity therebetween. The spiral cavity has a width that decreases towards the uphole end of the spiral cavity to define a tapered flow channel to receive cuttings therethrough whereby uphole movement of cuttings is facilitated during drilling.

Downhole hole cleaning joints and method of using same

An apparatus and method are provided for enhancing fatigue properties of subterranean well drill pipe immediate the area of securement to a tool joint by providing a multi-ramp upset series on the drill pipe which, in effect, enhances fatigue resistance properties of the pipe by increasing the wall thickness on the end of the drill pipe conduit to a greater length than that found on prior art, conventional upsets adjacent the drill pipe. The increased length of this upset configuration provides a smoother transition from the thick upset adjacent the tool joint down to the thin drill pipe body.

Apparatus and method for enhancing fatigue properties of subterranean

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Navasota, TX, United States of America

John Forester Price