Schlumberger Technology Corporation

Didier Pohl

Patrice Ligneul

Jacques Sellin

Florian Risser

Boris Valkov

Kamran Danaie

Philippe Gambier

Christian Chouzenoux

Emmanuel Rioufol

Yves Manin

Philippe Souhaite

Resonating sensors for use in high-pressure and high-temperature environments are provided. In one embodiment, an apparatus includes a sensor with a double-ended tuning fork piezoelectric resonator that includes a first tine and a second tine. These tines are spaced apart from one another so as to form a slot between the first and second tines. The width of the slot from the first tine to the second tine varies along the lengths of the first and second tines. Various other resonators, devices, systems, and methods are also disclosed.

Resonating sensor for high-pressure and high-temperature environments

The present invention includes a communications system to measure and transmit date from a zone of interest below a downhole assembly to a remote location. The communications system preferably includes a sensor gauge engaged through a communications port of the downhole assembly upon a communications cable whereby the communications cable and sensor gauge have substantially the same outer profile diameter.

Integral flush gauge cable apparatus and method

Apparatus for monitoring an underground formation through which a borehole passes, comprises a conductive casing () located in the borehole () passing through the formation (); a plurality of sensors (-) for measuring an electrical property of the formation () located in the borehole () outside the casing () and electrically insulated therefrom; and an electrical current source () positioned in the borehole () passing through the formation () and arranged to inject a current into the formation (); the casing () having an electrically insulating coating () over the surface thereof, at least in the region of the sensors (-), and an electrically conductive portion () in electrical contact with the formation (); and a current supply () being connected to the casing () such that current flows into the formation () from the electrically conductive portion () which acts as the current source, the sensors (-) measuring the electrical property of the formation () resulting from such current flow.

Permanent apparatus for monitoring a well by injecting current through the casing into the formations

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Paris, France

Didier Pohl