Varco I/p, Inc.

Ronaldus R M Roling

David Brian Mason

George I Boyadjieff

Brian L Eidem

Hans Van Rijzingen

Daniel P Juhasz

Gustaaf Louis Van Wechem

Herman M Kamphorst

Hans Joachim Dietrich Böttger

Johannes Wilhelmus Henricus Van Rijzingen

An oil and gas well drilling system is provided that includes a top drive assembly having an output shaft; and a pipe running tool having a top drive extension shaft connected to the top drive output shaft and engageable with a pipe string to transmit translational and rotational forces from the top drive assembly to the pipe string, wherein the pipe running tool further includes a cementing pipe connected to the top drive extension shaft and having a fluid passageway which receives cement during a cementing operation.

Pipe running tool having a cement path

An oil or gas well slip system is provided that includes a first movable member having an interactive contact surface and a second movable member having a mating interactive contact surface for slidable engagement with the interactive contact surface of the first movable member. The first and second movable members are each comprised of a first material. A second material, compositionally different from the first material, is attached to the interactive contact surface of either the first or the second movable member.

Non-seize material attachment for a drill slip system

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Rosmalen, Netherlands

Ronaldus R M Roling