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Drochon Bruno: Spacer fluid additive. Prad Res & Dev, Schlumberger Holdings, Schlumberger Technology, Schlumberger Services Petrol, July 1, 2009: EP2075303-A1 (38 worldwide citation)

A spacer fluid comprising a fluid and a viscosity agent wherein the viscosity agent is a mixture of polyvinylalcohols having at least two polyvinylalcohols with different degrees of hydrolysis such that the rheology of the spacer fluid is stable during temperatures changes.


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Rayssiguier Christophe, Allouche Mickael: Method and apparatus to set a plug in a wellbore. Schlumberger Services Petrol, Schlumberger Technology, Schlumberger Holdings, Prad Res & Dev, February 28, 2007: EP1757770-A1 (22 worldwide citation)

The invention provides an apparatus to be lowered in a borehole, comprising: (i) a delivery section for delivering a plugging fluid; (ii) a setting section comprising a longitudinal element and a flexible sleeve into which the plugging fluid is delivered; and (iii) a disconnect mechanism to allow th ...


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Chaudoreille Francois, Permuy Alfred, Donzier Eric: A density and viscosity sensor. Schlumberger Services Petrol, Schlumberger Technology, Schlumberger Holdings, Prad Res & Dev, July 4, 2007: EP1804048-A1 (21 worldwide citation)

A density and viscosity sensor 1 for measuring density and viscosity of fluid F, the sensor 1 comprising: - a resonating element 3, 3A, 3B, 3C, 3D, 3E, 3F, 3G arranged to be immersed in the fluid F, - an actuating/detecting element 4, 4A, 4B coupled to the resonating element, - a connector 7 for cou ...


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Le Roy Delage Sylvaine, Bulte Helene, Bellabarba Mario: Self-repairing isolation systems. Schlumberger Services Petrol, Schlumberger Technology, Schlumberger Holdings, Prad Res & Dev, February 18, 2009: EP2025732-A1 (15 worldwide citation)

The present invention discloses a composition for completing a well comprising a pumpable fluid made of a settable material and a reactive material able to swell in contact with liquid and/or gaseous hydrocarbon and/or water and/or carbon dioxide, said reactive material added in a quantity such that ...


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Chan Keng Seng, Elmarsafawi Youssef: Cementing compositions and application thereof to cementing oil wells or the like. Schlumberger Services Petrol, Schlumberger Technology, Schlumberger Holdings, Prad Res & Dev, Schlumberger Oilfield Assist, August 2, 2006: EP1686234-A1 (14 worldwide citation)

The invention relates to composition particularly suitable for squeeze cementing operations at temperature above 160 DEG C. This composition comprises an aqueous base, a liquid set-retarder and a solid phase including a blend of micro fine alumina, micro fine silica and a micro fine cementitious mat ...


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Guillot Dominique, Maitland Geoffrey, Cooper Iain: Method and apparatus for well construction. Schlumberger Services Petrol, Schlumberger Technology, Schlumberger Holdings, Prad Res & Dev, June 6, 2007: EP1793078-A1 (13 worldwide citation)

A method of constructing a well comprising a borehole drilled through underground formations, comprises: positioning at least one device on the outside of the tubular string (e.g. a drill string or casing string), the device being operable to move between first and second configurations; positioning ...


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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 ( ...


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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 ...


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