61
Tannenbaum Eli, Burgess Trevor, Kelessidis Vassilios, Orban Andre, Williams John, Zanker Klaus: Measurement system and method for quantitatively determining the concentrations of a plurality of gases in drilling mud.. Anadrill Int, May 30, 1990: EP0370548-A1 (6 worldwide citation)

A system for the quantitative analysis of one or more evolving gases exiting a borehole includes a Venturi ejector (42) for substantially capturing liberated gases in the bell nipple (43) and return line (27), a rotating disk extractor (90-92-95) for substantially extracting gases entrained and diss ...


62
Wu Peter T, Tabanou Jacques R: Well logging method and apparatus. Anadrill Int, Schlumberger Services Petrol, September 3, 1997: EP0793119-A2 (6 worldwide citation)

A well logging method and apparatus are disclosed for determining borehole corrected formation resistivity, borehole diameter, and borehole fluid (mud) resistivity with improved accuracy. A logging device in the borehole transmits electromagnetic energy from a transmitter, which energy is received a ...


63
Eddison Alan M: Directional drilling motor assembly. Anadrill Int, Schlumberger Services Petrol, May 8, 1996: EP0710764-A2 (5 worldwide citation)

An articulated directional drilling tool assembly for use in drilling a borehole having a short radius of curvature includes a mud motor whose housing is pivotally connected to a lower housing having upper and lower sections that are joined together in a manner to define a bend angle. The lower hous ...


64
Orban Jacques J H, Zanker Klaus J, Orban Andre E: Method and apparatus for measurement of fluid flow in a drilling rig return line.. Anadrill Int, August 17, 1988: EP0278671-A1 (5 worldwide citation)

An improved method and apparatus is disclosed for use in a return line system (26) of a drilling rig to determine a volumetric fluid flow rate and, therefore, to aid in detecting a kick in a well. The apparatus comprises an ultrasonic level sensor (10), an ultrasonic doppler velocity sensor (12) and ...


65
Eddison Alan M, Kotsonis Spyro J: Steerable drilling tool and system. Anadrill Int, Schlumberger Services Petrol, March 19, 1997: EP0763647-A2 (5 worldwide citation)

A steerable rotary drilling tool includes a drill bit mounted on the lower end of a housing by a drive shaft having an articulative coupling that allows the bit's rotation axis to be inclined relative to the rotation axis of the housing, an eccentric weight in the housing that maintains the bit axis ...


66
Das Pralay K, Song Haoshi: Load cells for sensing weight and torque on a drill bit while drilling a well bore.. Anadrill Int, Schlumberger Services Petrol, March 1, 1995: EP0640743-A2 (5 worldwide citation)

A load cell for sensing weight and torque on a drill bit during a drilling operation includes a cylindrical load cell made from a material with minimum residual stress. A plurality of strain gages are arranged symmetrically on each load cell and electrically coupled to form two Wheatstone bridges. T ...


67
Rasmus John: Pore pressure formation evaluation while drilling.. Anadrill Int, November 2, 1989: EP0339752-A1 (4 worldwide citation)

Formation Strength and other measurement while drilling parameters are combined in a formation volumetric analysis which produces not only the traditional volumetric components of clay volume, mineral volume, total porosity, and water filled porosity, but also, in shaley formations, an excess or ove ...


68
Wick Christian: Method for controlling a drilling operation.. Anadrill Int, October 11, 1989: EP0336490-A1 (4 worldwide citation)

A method for drilling a borehole with a rotating bit connected to another downhole component includes generating a load signal which indicates the mechanical loading placed on the downhole drilling components as a quantified indication of drilling roughness and deriving therefrom an indication of th ...


69
Nitis Spyros S, Ohmer Herve, Gotlib Mikhail V: Method and apparatus for drilling and re-entering multiple lateral branches in a well. Anadrill Int, Schlumberger Services Petrol, April 8, 1998: EP0834643-A2 (4 worldwide citation)

A method and apparatus for landing and orienting selected tools to selected depths within a well casing. The well casing is provided with a plurality of casing nipples located at selected depths with each of the landing and orienting joints defining a differing internal landing profile and having a ...


70
Montaron Bernard: Methods and devices for real-time formation imaging through measurement-while-drilling telemetry.. Anadrill Int, Schlumberger Services Petrol, November 29, 1995: EP0684490-A2 (4 worldwide citation)

Methods for providing an image at the surface of a formation surrounding a borehole in real-time include associating resistivity measurements with a predetermined number of preselected toolface positions. The resistivity measurements are subjected to data compression and transmitted uphole by MWD te ...