51
Holenka Jacques M, Sloan William R, Evans Michael L, Best David L, Kurkoski Philip L: Logging while drilling method and apparatus for measuring formation characteristics as a function of angular position within a borehole.. Schlumberger Services Petrol, Anadrill Int, July 19, 1995: EP0663511-A2 (13 worldwide citation)

A method and apparatus for measuring formation characteristics as a function of angular distance segments about the borehole is disclosed. The measurement apparatus includes a logging while drilling tool which turns in the borehole while drilling. Such characteristics as bulk density, photoelectric ...


52
Vercaemer Claude, Orban Jacques: Methods and apparatus for expanding tubular members. Schlumberger Services Petrol, Schlumberger Technology, Schlumberger Holdings, Prad Res & Dev, Schlumberger Oilfield Assist, November 2, 2006: EP1717411-A1 (12 worldwide citation)

A tool (10) for expanding a tubular member in a well, comprises: a locating device for locating the tool in the tubular member to be expanded; and an expanding device for expanding the tubular member beyond its starting diameter, the expanding device comprising a radial array of expanding elements ( ...


53
Moriarty Keith: Retrievable radiation source carrier.. Schlumberger, Schlumberger Services Petrol, Schlumberger Technology, Schlumberger Holdings, September 23, 1992: EP0505260-A2 (12 worldwide citation)

A retrievable radiation source carrier assembly for a logging while drilling tool is disclosed. The carrier includes a solid rod or member of high strength and low elastic modulus that connects the housings of at least two radiation sources. In a preferred embodiment, the carrier includes a sheath o ...


54
Baur Vincent, Rothnemer Pascal: A visualization system for a downhole tool. Schlumberger Services Petrol, Schlumberger Technology, Schlumberger Holdings, Prad Res & Dev, June 3, 2009: EP2065557-A1 (12 worldwide citation)

Apparatus for visualizing a downhole tool in a subsurface environment. The apparatus comprising: an input for receiving data on at least one of the downhole tool and the subsurface environment, a physical model processing said input for generating a representation of the downhole tool moving through ...


55
Auzerais Francois M, Schroeder Robert J: Down-hole tool and method for providing images of earth formations on a microscopic scale. Schlumberger, Schlumberger Services Petrol, Schlumberger Technology, December 11, 1996: EP0747569-A2 (12 worldwide citation)

Images of rock formations below the earth's surface can be obtained on a microscopic scale. A borehole tool uses a seal to isolate an interval of the formation from borehole fluids which are outside the seal. A probe of the toot engages a wall of the formation and then draws formation fluid from the ...


56
Ciglenec Reinhart, Kurkjian Andrew: Earth formation pressure measurement with penetrating probe. Schlumberger Holdings, Schlumberger Services Petrol, April 19, 2000: EP0994238-A2 (11 worldwide citation)

The present invention relates to an apparatus and method for measuring a property of a subsurface formation intersected by a wellbore, which contemplate the use of a tool body adapted for movement through the wellbore. Actuating means is carried by the tool body, and a probe is propelled by the actu ...


57
Eddison Alan, Ingold Charles, Leising Lawrence J: Directional drilling with downhole motor on coiled tubing.. Anadrill Int, Schlumberger Services Petrol, November 24, 1993: EP0571045-A1 (11 worldwide citation)

A downhole adjustable orienting sub is included in a directional drilling tool string that is run into the borehole on coiled tubing. The bent housing of the tool string defines a bend angle and a bend point, and the bend point is oriented about the center of the bore by operating the orienting sub. ...


58
Simon Mathieu, Budan Henri, Mosse Laurent, Hizem Medhi: An electromagnetic probe. Schlumberger Services Petrol, Schlumberger Technology, Schlumberger Holdings, Prad Res & Dev, Schlumberger Oilfield Assist, August 23, 2006: EP1693685-A1 (11 worldwide citation)

An electromagnetic probe (1) measures the electromagnetic properties of a subsurface formation (GF) in a limited zone surrounding a well-bore hole (WBH). The well-bore hole is filled with a well-bore fluid (DM). The probe comprises a pad (2) having a first face defining a first area arranged to be p ...


59
Zanker Klaus, Orban Jacques: Method and system for measurement of fluid flow in a drilling rig return line.. Anadrill Int, Schlumberger Services Petrol, July 24, 1991: EP0437872-A2 (11 worldwide citation)

Improved methods and systems are provided for determining a volumetric flow rate of mud in a return line without the aid of a velocity probe. A mud level sensor is located in a return line chimney preferably in close proximity to the bell nipple. The sensor senses the height of the mud flowing in th ...


60
Guillot Dominique, Anxionnaz Herve, Orban Jacques: Method and apparatus for well treatment. Schlumberger Services Petrol, Schlumberger Holdings, Schlumberger Technology, May 3, 2006: EP1653043-A1 (11 worldwide citation)

A well treatment tool, comprising: a tool body; a clamping system for locating the tool body in a well; a positioning system for orienting the tool body in the well axially and azimuthally; a reservoir system comprising at least one fluid reservoir in the tool body; and a pumping system for pumping ...