Case study of hydraulic fracture monitoring using low-frequency components of DAS data

“…A majority of the current DAS applications utilize the high-frequency components of the data. More recently, low-frequency (< 1 Hz) DAS acquisitions have shown promise in a low rate, unconventional wells for production logging, as well as in cross-well monitoring of completions during hydraulic fracturing operations and for detecting flow behind cemented casing/tubing [13,14,15,16]. A unique characteristic of low-frequency DAS is that it is sensitive to both temperature and strain effects.…”

Section: Introductionmentioning

confidence: 99%

Low-Frequency Distributed Acoustic Sensing for Early Gas Detection in a Wellbore

et al. 2021

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An unexpected and unwanted influx of gas or "kick" into the wellbore during hydrocarbon drilling can cause catastrophic blowout incidents, resulting in human casualties, ecological damage, and asset losses. The ability of the oil and gas industry to control gas kick depends on our ability to accurately detect and monitor gas migration in a borehole in real-time. This study demonstrates the application of optical fiber-based Distributed Acoustic Sensors (DAS) for early detection and monitoring of gas in wellbore. Multiphase flow experiments conducted in a 5000 ft. deep test-well are analyzed for different injection, circulation, and pressure conditions. In each case, the low-frequency component of DAS demonstrates a superior capability to detect gas signatures both inside the tubing and the annulus of the well, even at small gas volumes. In comparison, the highfrequency DAS data seems limited in detail. The gas influx velocity was calculated using the frequency-wavenumber analysis of the gradient of the low-frequency DAS phase with respect to time, which shows good agreement with theoretical velocity estimates using flow models and surface gauge measurements. This study demonstrates a novel workflow to analyze low-frequency DAS to qualitatively and quantitatively map gas influx in a wellbore.

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A Literature Review

Li¹,

Karrenbach²,

Ajo‐Franklin³

2021

Geophysical Monograph Series

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Case study of hydraulic fracture monitoring using low-frequency components of DAS data

Cited by 22 publications

References 4 publications

Application and research progress of distributed optical fiber acoustic sensing monitoring for hydraulic fracturing

Application and research progress of distributed optical fiber acoustic sensing monitoring for hydraulic fracturing

Low-Frequency Distributed Acoustic Sensing for Early Gas Detection in a Wellbore

A Literature Review

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