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• W2313598936 abstract "Abstract If we are to continue to use acoustic logging as a viable method for characterizing near-wellbore formation characteristics and as a valid method of tying depth-to-time, then logging techniques should be updated and adapted for use with today's tools and in today's unconventional and directional drilling applications. Unlike seismic processes, which have undergone research and changes to adapt to the more complex characterization needs of today's formations, acoustic logging techniques have stayed relatively stagnant. In order to stay relevant, acoustic logging processes must demonstrate that they are adapatable to the current environment of lower margins and complex formations. The following discussion focuses on four seismic techniques adapted for acoustic logging processes, the process for choosing these particular techniques to adapt, and the results achieved. The two questions which set us on this journey were: 1) How do we make better use of the acoustic data currently collected? And 2) How do we provide more robust formation characteristic information from that data? In order to answer these questions, we developed new acoustic logging algorithms and routines inspired by the following four seismic techniques and adapted the research into proprietary software for processing raw, acoustic waveform data. First, we have adapted the use of compressional waves to map drops in energy across natural fractures which allows industry to move away from many of the limitations imposed by more widely used techniques. Second, as part of the workflow presented in the compressional fracture identification methodology, we have adapted stacking to improve results and amplify anomalies. Third, in order to provide a broad available toolsets and usable data, we have incorporated advanced filtering routines based on predictive deconvolution, which can be used to process acoustic data from alternative tools or to enhance data collected using measurement-while- drilling or logging-while-drilling tools. Fourth and last, applicable to both shear and compressional waveform processing, we have chosen to move away from Alford-based azimuth computations, or at least correct for assumptions in Alford-based azimuth computations that are not relevant in unconventionals, so that borehole deviation does not adversely affect the processing. The use of compressional waves to map natural fracture patterns has found great success in both vertical and lateral wells and has been used in the field in the Permian, Eagle Ford, the Bakken, and in various international fields. Comparisons against image and core results demonstrate an 80-85% correlation rate. The following discussion will go over two case studies, the evaluation method used to study the correlation, briefly discuss the workflow used, and also provide an example of how theadvanced filtering produces much cleaner waveforms for processing than relying solely on frequency filtered waveforms. These new processes allow acoustic processing to enter the modern age of exploration and create a new, more direct process for finding the fracture density in the well bore. Furthermore, they may be incorporated in to new and old processing techniques, making the most of the modern tools available." @default.
• W2313598936 created "2016-06-24" @default.
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• W2313598936 date "2016-04-20" @default.
• W2313598936 modified "2023-09-26" @default.
• W2313598936 title "Adopting Seismic Methodologies to Acoustic Logging Applications" @default.
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• W2313598936 doi "https://doi.org/10.2118/180067-ms" @default.
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