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Combining active and passive acoustic methods to image hydraulic fracture growth in laboratory experiments

Publications associées (32)

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Parity-Time Symmetry in Acoustics: Theory, Devices, and Potential Applications

Romain Christophe Rémy Fleury

Parity-time (PT) symmetric systems based on bal- anced distributions of gain and loss have attracted significant attention in wave physics, enabling the possibility of compen- sating material losses in photonic systems, and of inducing ex- ceptional scatte ...

Institute of Electrical and Electronics Engineers2016

Multi-stage fracturing is the current preferred method of completion of horizontal wells in unconventional hydrocarbon reservoirs. Its core component consists in simultaneously initiating and propagating an array of hydraulic fractures. We develop a numeri ...

Pergamon-Elsevier Science Ltd2015

Robustness to formation geological heterogeneities of the limited entry technique for multi-stage fracturing of horizontal wells is investigated. It is necessary to simulate the complete process of initiation and propagation of multiple hydraulic fractures ...

Springer Wien2015

Particle laden fluids in hydraulic fracturing

Brice Tanguy Alphonse Lecampion

The aim of hydraulic fracturing is to create a highly conductive pathway in the reservoir formation of interest. This is typically achieved by ``propping'' the created fracture with solid particles (i.e. proppant) in order to prevent complete closure of th ...

2015

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Variable acoustic properties can be obtained at the diaphragm of an electroacoustic transducer, with the help of very basic control strategies, among which is the simple electrical shunting of the transducer. These shunt techniques are compared to active a ...

2011

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The acoustic impedance at the diaphragm of an electroacoustic transducer can be varied using a range of basic electrical control strategies, amongst which are electrical shunt circuits. These passive shunt techniques are compared to active acoustic feedbac ...

Acoustical Society of America2011

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Usually acoustic beamformer or directive microphones are used in order to focus on known potential locations emitting sounds so as to identify and extract their major noise components. However performances of these techniques depend on the number of microp ...

2009

Spatio-temporal analysis of spontaneous speech with microphone arrays

Guillaume Lathoud

Accurate detection, localization and tracking of multiple moving speakers permits a wide spectrum of applications. Techniques are required that are versatile, robust to environmental variations, and not constraining for non-technical end-users. Based on di ...

EPFL2007

Spatio-Temporal Analysis of Spontaneous Speech with Microphone Arrays

Guillaume Lathoud

IDIAP2006

Spatio-Temporal Analysis of Spontaneous Speech with Microphone Arrays

Guillaume Lathoud

École Polytechnique Fédérale de Lausanne2006