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• W2801349735 abstract "Acoustics enjoys a wide array of applicability in the Oil and Gas industry. Signals with very low-frequencies (tens of Hertz) are routinely used on surface to image the earth subsurface delineating hydrocarbon reservoirs while signals with mid-frequencies (thousands of Hertz) to high-frequencies (hundreds of kilo Hertz) are used in deep boreholes to probe rock mechanical properties and evaluate completion hardware. This article reviews a few recent advances in these applications spanning both measurement concepts and processing and inversion approaches. Three applications are covered, going from high to low frequencies. The first relates to an ultrasonic imager deployed in open boreholes to probe the laminated structure of unconventional shale rock formations at depth of more than 3000 m. The imager yields rock compressional and shear wavespeed images as a function of depth and azimuth revealing a host of geomechanical manifestations of the borehole shape and near-wellbore region at an unprecedented centimetric spatial resolution. The quantitative images have bearing on rock strength and local stresses as they relate to the hydraulic fracturing of these shale formations. The second relates to the interpretation of the complex sonic response in a well cased with double steel strings cemented to the rock formation for the purpose of evaluating the integrity of the cement placed between the outer string and formation. Here, machine learning-based approaches are employed with training on modeling and experimental datasets to develop effective and wellsite diagnosis for the condition of the cement sheath. The third relates to the seismic imaging domain and the deployment of novel accelerometers added to hydrophones on marine seismic cables to capture the subsurface-reflected pressure signals and their spatial gradients. The combination of the two sensors provides the means to deghost the signal from the sea surface reflection, and more importantly, reconstruct the subsurface seismic wavefield that is poorly sampled across cables that are spaced 75m to 150 m apart. Novel compressive-sensing schemes coupled with wave physics are employed for the wavefield reconstruction at virtual sampling rates way beyond Nyquist’s criterion." @default.
• W2801349735 created "2018-05-17" @default.
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• W2801349735 date "2018-01-01" @default.
• W2801349735 modified "2023-09-23" @default.
• W2801349735 title "Recent advances in the use of acoustics across the frequency spectrum in the oil and gas industry" @default.
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• W2801349735 doi "https://doi.org/10.1063/1.5031511" @default.
• W2801349735 hasPublicationYear "2018" @default.
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