1
David R Hall: Diamond thrust bearing and method for manufacturing same. Anadrill, Workman Nydegger & Jensen, March 3, 1992: US05092687 (269 worldwide citation)

A diamond thrust bearing and method for manufacturing the diamond thrust bearing wherein diamond bearing pads are interference fitted at ambient temperatures into a plurality of equidistantly spaced bearing pad recesses located in a circle in a receiving surface of a bearing pad retainer. The bearin ...


2
Ohmer Herve: Apparatus for establishing branch wells from a parent well. Anadrill Int, Schlumberger Services Petrol, February 11, 1998: EP0823534-A1 (130 worldwide citation)

A method and apparatus for creating multiple branch wells from a parent well is disclosed. According to a first embodiment of the invention a multiple branching sub is provided for placement at a branching node of a well. Such sub includes a branching chamber (32) and a plurality of branching outlet ...


3
Bernhard Prevedel, Warren E Askew, Alan Eddison: Directional drilling methods and apparatus. Anadrill, David L Moseley, John J Ryberg, August 18, 1992: US05139094 (77 worldwide citation)

Methods are provided for controlling the direction of a borehole drilled by a downhole motor, including the steps of positioning downhole adjustable bent housing and near-bit stabilizer in the drill string, adjusting the bent housing from its normally straight condition to its bent condition to effe ...


4
David Malone: Sinusoidal pressure pulse generator for measurement while drilling tool. Anadrill, Stephen L Borst, July 11, 1989: US04847815 (61 worldwide citation)

A pressure pulse generator which generates relatively sinusoidal pressure pulses in a fluid flowing in a borehole is disclosed. The pressure pulse generator for a MWD tool broadly comprises: a housing adapted to be connected in a tubing string so that fluid flowing in the string will at least partia ...


5
Stuart Jardine, Dominic McCann, Marc Lesage: Method and apparatus for determining characteristics of the movement of a rotating drill string including rotation speed and lateral shocks. Anadrill, John J Ryberg, September 18, 1990: US04958125 (60 worldwide citation)

The invention is related to a method of determininng the instantaneous rotation speed of a drill string or a drill bit in a borehole or the lateral shocks applied to the string or bit. The centripetal acceleration of the drill string is measured at at least two opposite ends of a drill string diamet ...


6
Pralay K Das: Apparatus and method for measuring differential pressure while drilling. Anadrill, Stephen L Borst, Dave Gordon, February 21, 1989: US04805449 (49 worldwide citation)

An apparatus and method for measuring differential pressure of mud internal a drill string and mud in a borehole annulus is disclosed. The apparatus typically comprises: a drill collar having a pressure balancing piston in hydraulic contact with the borehole annulus mud; a shaped cylinder in contact ...


7
Warren E Askew: Downhole adjustable bent assemblies. Anadrill, David L Moseley, John J Ryberg, June 2, 1992: US05117927 (48 worldwide citation)

In accordance with an illustrative embodiment of the present invention, a downhole adjustable apparatus for creating a bend angle in a drill string includes a mandrel mounted for rotation between first and second angular positions within a housing, the mandrel being telescoped into the housing on an ...


8
David R Hall: High performance bearing pad for thrust bearing. Anadrill, Kent S Burningham, John J Ryberg, Wayne I Kanak, October 19, 1993: US05253939 (48 worldwide citation)

Cylindrical bearing pads are insertable into bearing pad recesses formed in a receiving surface of a bearing pad retainer in a load-carrying structure. The bearing pads have an insertion end which is fixed into the bearing pad recess by brazing or by interference fitting and a bearing end which proj ...


9
Eli Tannenbaum, Trevor Burgess, Vassilios Kalessidis, Andre Orban, John Williams, Klaus Zanker: Measurement system and method for quantitatively determining the concentrations of a plurality of gases in drilling mud. Anadrill, Stephen L Borst, David P Gordon, December 19, 1989: US04887464 (48 worldwide citation)

A system for the quantitative analysis of one or more evolving gases exiting a borehole includes a Venturi ejector for substantially capturing liberated gases in the bell nipple and return line, a rotating disk extractor for substantially extracting gases entrained and dissolved in drilling mud, and ...


10
Pralay K Das: Methods and apparatus for controlled directional drilling of boreholes. Anadrill Incorporated, April 26, 1988: US04739841 (44 worldwide citation)

In the representative embodiments of the present invention described herein, new and improved methods and apparatus are disclosed for measuring various forces acting on an intermediate body between the lower end of a drill string and the earth-boring apparatus coupled thereto whereby the magnitudes ...