National Oilwell Varco, L.p.

Grant Prideco, Inc.

Michael Joseph Jellison

Andrei M Muradov

Andrei Muradov

John Forester Price

Stephen C Hain

Guillaume Plessis

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

A tubular member has a longitudinal axis, a first end, and a second end. The tubular member includes a pin connector including an external shoulder, an internal shoulder axially spaced from the external shoulder, and a plurality of threads in a region between the external shoulder and the internal shoulder that taper relative to the longitudinal axis at 1.0 to 1.5 inches per foot. The threads include an axial density measured in a number of threads per inch (TPI), and when the pin connector is threadably engaged with a box connector, each of the threads contacts a corresponding box thread on the box connector along a projected radial distance H. In addition, the threads are configured such that the product of 2(&#x221a;{square root over (3)})(H)(TPI) is greater than or equal to 0.95 and less than or equal to 1.05.

Balanced thread form, tubulars employing the same, and methods relating thereto

A system and method are provided for gauging multi-start threads on an oilfield tubular connection include a pin memberand a box member. One or more external starting threads are successively gauged with a single thread ring gauge, and the same threads are simultaneously gauged with a multi-thread ring gauge. Each of two or more internal starting threads are successively gauged with a single thread plug gauge, and the same threads are simultaneously gauged with a multi-thread plug gauge

Growing community of inventors

Houston, TX, United States of America

Michael Joseph Jellison