Astec Developments Limited

Japan National Oil Corporation

Diamant Boart Societe Anonyme

Weatherford/lamb, Inc.

Paradigm Drilling Services Limited

Neil Andrew Simpson

Alexander Craig Mackay

David Michael Haugen

Mark E Hopmann

David H Grant

Andrew Michael Duggan

Duncan James Trinder

Grant Adams

James Kennon Whanger

William Ball Roy

John Strachan Nicoll

Robert Cowman

Graham Mackay

Walter Aldaz

Paul Raymond Coey

David Stephenson

Simon John Harrall

A rotary shaft assembly including a mechanism by which one part of the shaft rotates about a rotation axis which is controllably deviated from the rotation axis of the other part of the shaft. The angular extent of deviation is controllably varied by mutually rotating adjacent shaft supports about an axis which is at a non-zero angle with respect to both rotation axes. The direction in which the shaft is deviated is controlled by rotating the non-deviated shaft support with respect to a reference shaft support. The assembly includes remote control of direction and deviation and is is particularly applicable to drilling of deviated wells. Further, the assembly includes a remotely actuated and de-actuated temporary anchoring system for downhole direction sensing and deviation adjustment.

Shaft alignment

Downhole tools having circumferentially spaced rolling elements

A two-part investment casting process is described which involves first casting a hard material shell (32) such as stellite, which is threaded or profiled internally to allow attachment to a pre-machined shank (44) such that the advantages of a fluid and wear resistant investment casting of complex shape may be combined with a tough and machinable shank to allow attachment to the drill string.

Drill bit or corehead manufacturing process

A well bore enlarger comprising, in its fixed-arm embodiment, a tubular housing member having an enlarged section with an outer diameter substantially the same as the well bore diameter, the enlarged section having a plurality of longitudinal cut-out portions defining blades of the enlarged section therebetween; a longitudinal slot within the blade; a cutting arm mounted to the blade within the slot having cutting edges and a fluid gallery between the cutting edges which gallery communicates with the slot and the well bore; synthetic diamond material attached to the cutting arm; and means on the tubular housing member for directing a fluid through the fluid gallery of the cutting arm. In the expandable-arm embodiment of the well bore enlarger, the tubular housing member is formed with the enlarged section as previously described, with slots, blades and cut-out portions. The expandable-arm embodiment further comprises a cutting arm which is pivotally mounted within the blade and moveable between radially retracted position wherein the cutting arm is disposed essentially within the outer diameter of the enlarged section and a radially extended position wherein the outer edge of the cutting arm is disposed essentially outside the diameter of the enlarged section and the inner edge of the cutting arm remains at all times essentially within the outer diameter of the enlarged section; stop means within the blade and engageable with the cutting arm to limit outward movement of the cutting arm; synthetic diamond material attached to the cutting arm; a tubular drive member slidably mounted within the tubular housing member, the drive member including a piston actuated by hydraulic fluid; means on the cutting arm and drive member for moving the cutting arm from its retracted position to its extended position; and means on the drive member for directing fluid toward the cutting edges of the cutting arm.

Well bore enlarger

Growing community of inventors

Aberdeen, United Kingdom

Neil Andrew Simpson