Schlumberger Technology Corporation

Schlumberger Holdings Limited

Service Pétroliers Schlumberger

Prad Research Development Limited

Roman Korkin

Kenneth Edward Stephenson

Oleg Zhdaneev

Wolfgang P Ziegler

Gilles Roux

Andrey Vladimirovich Fedorov

Lev Zakharov

Demid Valeryevich Demidov

Artem Valeryevich Kabannik

Methods for locating fluid interfaces in a cased wellbore include generating vibrations in the casing, thereby forming oscillations in the wellbore fluids and the casing. The oscillations are detected by a vibration detector. The oscillations are recorded by a data acquisition system. Mathematical processing of the oscillations by cepstrum analysis is performed to determine the depths of interfaces between fluids in the annulus. The methods may also be employed to determine the time at which a cement slurry begins to set and harden. The methods may be performed in real time.

Methods for determining positions of fluid interfaces and detecting cement setting in a subterranean wellbore

A neutron detector is provided which may include a neutron converting layer, and a scintillator layer adjacent the neutron converting layer. The neutron detector may further include a photomultiplier adjacent the scintillator layer. By way of example, the neutron detector may be used in a well logging apparatus to determine a neutron flux incident upon the neutron converting layer, and thereby determine the neutron porosity of a geological formation around a wellbore.

Photomultipler-based neutron detector

A method, apparatus and computer program product for measuring a composition of a multiphase fluid, including radiating a photon beam through the multiphase fluid and measuring radiation absorption by the multiphase fluid for at least three energy levels to obtain measured radiation absorption data, and providing the measured radiation absorption data to processing unit configured to calculate the composition of the multiphase fluid using the measured radiation absorption data, whereby an effect of an injected fluid on the absorption of the photon beam is taken into account during calculation of the composition of the multiphase fluid.

Method and apparatus for determining volume fractions in a multiphase flow

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Lawrenceville, NJ, United States of America

Roman Korkin