Walkaway VSP Using Multimode Optical Fibres in a Hybrid Wireline

Yu, Gang; Chen, Y.Z.; Wang, X.M.; Zhang, Q.H.; Li, Y.P.; Zhao, Baoyin; Wu, Jinyong; Greer, Joe

doi:10.3997/2214-4609.201601602

Cited by 5 publications

(2 citation statements)

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“…However, there are a significant number of drilled wells in which only the use of wireline DAS technology is possible. Nevertheless, only a limited amount of data examples recorded using temporarily installed wireline cable are available (Hartog et al ., 2014; Borland, Hearn and Sayed, 2016; Yu et al ., 2016a; Yu et al ., 2016b; Willis et al ., 2019).…”

Section: Introductionmentioning

confidence: 99%

Cable reverberations during wireline distributed acoustic sensing measurements: their nature and methods for elimination

Martuganova

Stiller

Bauer

et al. 2021

Geophysical Prospecting

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The application of distributed acoustic sensing in borehole measurements allows for the use of fibre optic cables to measure strain. This is more efficient in terms of time and costs compared with the deploying of conventional borehole seismometers. Nevertheless, one known drawback for temporary deployment is represented by the freely hanging wireline cable slapping and ringing inside the casing, which introduces additional coherent coupling noise to the data. The present study proposes an explanation for the mechanism of noise generation and draws an analogy with similar wave propagation processes and phenomena, such as ghost waves in marine seismics. This observation allows to derive a ringing noise filter function, to study its behaviour and to consider known effects of the gauge length filter. After examining existing methods aimed at eliminating ringing noise and results of their application, we propose a two‐step approach: (1) developing a denoising method based on a matching pursuit decomposition with Gabor atoms and (2) subtracting the noise model for imaging improvement. The matching pursuit method focuses on decomposing the original input signal into a weighted sum of Gabor functions. Analysing Gabor atoms properties for frequency, amplitude and position in time provides the opportunity to distinguish parts of the original signal denoting noise caused by the vibrating cable. The matching pursuit decomposition applied to the distributed acoustic sensing‐vertical seismic profiling data at the geothermal test site Groß Schönebeck provides a versatile processing instrument for noise suppression.

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Section: Introductionmentioning

confidence: 99%

Cable reverberations during wireline distributed acoustic sensing measurements: their nature and methods for elimination

Martuganova

Stiller

Bauer

et al. 2021

Geophysical Prospecting

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show abstract

“…Also fiber Bragg grating (FBG) sensors have been successfully commercialized for strain, temperature, and pressure monitoring [5][6][7]. Distributed optical fiber sensors have been breaking the ground in many fields including oil/gas exploration, earthquake monitoring, safety inspection, and structural health monitoring [8][9][10][11]. Most successes of optical fiber sensors are for physical parameter sensing and comparatively, optical fiber biochemical sensing is still on the way.…”

Section: Introductionmentioning

confidence: 99%

Recent Progress in Fiber Optofluidic Lasing and Sensing

et al. 2021

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Fiber optofluidic laser (FOFL) integrates optical fiber microcavity and microfluidic channel and provides many unique advantages for sensing applications. FOFLs not only inherit the advantages of lasers such as high sensitivity, high signal-to-noise ratio, and narrow linewidth, but also hold the unique features of optical fiber, including ease of integration, high repeatability, and low cost. With the development of new fiber structures and fabrication technologies, FOFLs become an important branch of optical fiber sensors, especially for application in biochemical detection. In this paper, the recent progress on FOFL is reviewed. We focuse mainly on the optical fiber resonators, gain medium, and the emerging sensing applications. The prospects for FOFL are also discussed. We believe that the FOFL sensor provides a promising technology for biomedical analysis and environmental monitoring.

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