Schlumberger Technology Corporation

Jacques Sellin

Patrice Ligneul

Didier Pohl

Florian Risser

Boris Valkov

Kamran Danaie

Marian Faur

Oliver Clinton Mullins

Xu Wu

Fabien Cens

Felix K Chen

Bernard Parmentier

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 invention concerns a device for measuring the speed and direction of rotation of an object () near to which it is placed. It comprises: Application particularly in the oil industry.

Compact device for measuring the speed and the direction of rotation of an object

A downhole optical apparatus includes an LED source, reflectance and fluorescence detectors, a plurality of fibers, a dichroic mirror (DM), a beam splitter/coupler, a probe, a short-pass filter (SP), a dichroic long-pass filter (LP), and a lens. Source light filtered by the SP is fed to the DM which deflects light of desired wavelengths only. The deflected light is focused by the lens onto a fiber and is ultimately injected into an oil flow by the probe. Light reflected by oil or fluorescing therefrom is received by the probe, and split by the splitter. A small portion is received by the reflectance detector. A large portion is received by the lens and directed to the DM which deflects reflected light and passes light at longer fluorescing wavelengths. Passed light is further filtered by the DM and LP to eliminate remnants of the reflected light, and provided to the fluorescence detector.

Downhole fluorescence detection apparatus

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Boissise le Roi, France

Jacques Sellin