Schlumberger Technology Corporation

Prad Research and Development Nv

Services Petroliers Schlumberger

Schlumberger Holdings Limited

Yves G Mathieu

Christian Chouzenoux

Erwann Lemenager

Martin G Luling

Matthe Contant

Sylvain Chambon

Nicolas Renoux

Stéphane Hiron

Patrick Gourdonneau

Erwan Lemenager

Juergen Zach

Erwann Etudes Et Prod Schlumberger Lemenager

Juergen Etudes Et Productions Schlumberger Zach

Techniques involve determining the conductivity profile of a formation from a well between a surface location and a borehole location. The method involves placing a first sensor at the surface location, a second sensor located at the borehole location, obtaining a first signal by detecting Schumann resonances from the electric field occurring at the first location, obtaining a second signal by detecting Schumann resonances from the electric field occurring at the second location with the second sensor; and combining the first and the second signal to determine the conductivity profile of the formation between the first location and the second location.

Method and apparatus for transmitting or receiving information between a downhole equipment and surface

The invention provides a method of receiving and/or transmitting information in a well drilled in a geological formation between a first location and a second location, the well comprising a casing communicating with the geological formation. The method comprises placing a first transducer at a first location, placing a second transducer at a second location. Transmitting an electric signal between the first and second transducers.

Method and apparatus for transmitting or receiving information between downhole equipment and surface

A downhole electromagnetic telemetry unit for use with a tubing string () includes an insulated electrically conductive member () and a processing unit (). The insulated electrically conductive member () is electrically coupled to the tubing string () at an upper measuring point () and a lower measuring point (). The processing unit () is configured to process a voltage difference measured between the upper measuring point () and the lower measuring point () across the insulated electrically conductive member () and to derive therefrom a signal transmitted from a surface location ().

Apparatus for receiving and transmitting signals in electromagnetic telemetry system used in a wellbore

An EM antenna for location on a pipe () surrounded by a casing (). The antenna has a power source () for injecting a current across a first insulated section () of the pipe () and an electrode () for conducting the current from the pipe () to the casing (). There is also a second insulated section () of the pipe arranged to operate together with the electrode () and first insulated section () for directing a path flow of the current. Such antennas are described both in relation to repeater arrangements as well as land and sea applications.

Downhole telemetry system

A well instrumentation system, comprising: a power and data supply; and a plurality of functional units attached to the power and data supply and distributed throughout the well, characterised in that the power and data supply comprises first and second substantially identical cables, and in that each unit comprises a first power supply channel and a first data channel connected to the first cable, a second power supply channel and a second data channel connected to the second cable, and a functional module which draws power from the first power supply channel or the second power channel module, and data from the first data channel or the second data channel. The power and data supply can comprise a surface unit that can be selectably connected to either the first or second cable. The selection of connection of the surface unit to one or other cable is effective to select the corresponding power and data channels in the functional units.

Redundant systems for downhole permanent installations

Growing community of inventors

Les Ulis, France

Yves G Mathieu