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Dorel Alain P: Apparatus and method for directional drilling using coiled tubing. Anadrill Internat, Schlumberger Services Petrol, October 2, 2002: EP1245783-A2 (11 worldwide citation)

A steerable directional drilling tool assembly includes a bent housing (12) defining a bend angle and having a mud motor (13) in its upper section and a drill bit (15) below its lower section, an orienting tool (17) rotatably coupled to such upper section and suspended on coiled tubing (20) that ext ...


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Barlet Gouedard Veronique, Zusatz Ayache Benedicte, Porcherie Olivier: Geopolymer composition and application in oilfield industry. Schlumberger Services Petrol, Schlumberger Technology, Schlumberger Holdings, Prad Res &Amp, Dev, February 13, 2008: EP1887065-A1 (11 worldwide citation)

The invention provides geopolymeric compositions, which have controllable thickening and setting times for a wide range of temperatures and a large range of geopolymer slurry densities. The geopolymer slurry compositions have good mixability and pumpability, whilst the set materials develop good com ...


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Meehan Richard: Method and apparatus for suppressing drillstring vibrations. Anadrill Int, Schlumberger Services Petrol, March 10, 1999: EP0900918-A2 (10 worldwide citation)

Apparatus and methods are described for isolating in a drillstring (30) a device (302) from acoustic noise by introducing between the device (302) and a source (306) of acoustic vibration an noise isolating apparatus (303), wherein the noise isolating apparatus (303) has adjacent zones of different ...


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Evans Michael, Holenka Jacques, Rhein Knudsen Erik: Stand-off compensated formation measurements apparatus and method.. Schlumberger, Schlumberger Services Petrol, Schlumberger Technology, Schlumberger Holdings, September 23, 1992: EP0505261-A2 (10 worldwide citation)

Apparatus and method for measuring density, porosity and other formation characteristics while drilling is disclosed. The apparatus, preferably housed in a drill collar and placed within a drill string, includes a source of neutrons and a source of gamma rays placed within a tubular body which is ad ...


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Chouzenoux Christian, Nouaze Veronique: Method and apparatus for communicating across casing. Schlumberger Services Petrol, Schlumberger Technology, Schlumberger Holdings, Prad Res & Dev, Schlumberger Oilfield Assist, May 31, 2006: EP1662673-A1 (10 worldwide citation)

A system for passing an electromagnetic signal through a casing comprises a tool body that can be positioned inside the casing; means for magnetically saturating the casing in the vicinity of the tool; a transmitter for transmitting an electromagnetic signal from the tool antenna to the outside of t ...


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Fu Diankui, Dismuke Keith, Davies Stephen, Wattana Piyarat Ann: Viscoelastic fluids for oilfield uses. Schlumberger Technology, Schlumberger Holdings, Schlumberger Services Petrol, March 15, 2006: EP1634938-A1 (10 worldwide citation)

The present invention provides viscoelastic fluids that contain nanotube structures that may be used advantageously as oilfield stimulation fluids in many different applications, most particularly as a fracturing fluid. Viscoelastic fluid compositions of the present invention include an aqueous medi ...


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Ehlig Economides Christine: Method for individually characterizing the layers of a hydrocarbon subsurface reservoir.. Schlumberger, Schlumberger Services Petrol, Schlumberger Technology, Schlumberger Holdings, April 22, 1992: EP0481866-A2 (10 worldwide citation)

The invention relates to reservoir evaluation and is more specifically directed to a method of characterizing the individual response of a layer of a multi-layer hydrocarbon reservoir traversed by a well, based on downhole flow rate and pressure measurements performed during transient tests initiate ...


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Barber Thomas D, Minerbo Gerald N, Sijercic Zlatko, Broussard Tracy E: Method and apparatus for evaluating the resistivity of invaded formations at high apparent dip angle. Schlumberger, Schlumberger Services Petrol, Schlumberger Technology, Schlumberger Holdings, July 21, 1999: EP0930519-A2 (10 worldwide citation)

The present invention relates generally to a method and apparatus for evaluating the resistivity of invaded formations at high apparent dip angle. A multi-array induction tool having a plurality of arrays is disposed in a borehole. Signals from a subset of coils of the array are selected to probe di ...


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Parrot Robert A, Brooks James E, Aseltine Clifford L, Lerche Nolan C, Rozek Kenneth E: A perforating gun having a plurality of charges.. Schlumberger Services Petrol, Schlumberger Technology, Schlumberger Holdings, October 4, 1995: EP0675262-A1 (9 worldwide citation)

A perforating apparatus adapted to be disposed in a wellbore includes a plurality of shaped charges, an electrical current carrying conductor, and a plurality of exploding foil or exploding bridgewire initiators disposed, respectively, between the the plurality of charges and the current carrying co ...