Improved Aero/Hydro Flow-Rate Model Using Acoustics
- Muralidhar Seshadri (Halliburton) | Jonathan B. Freund (University of Illinois at Urbana-Champaign) | Pranab N. Jha (L&T Technology Services) | Atchyuta Ramayya Venna (L&T Technology Services) | Darren Walters (Halliburton) | Srinivasan Jagannathan (Halliburton)
- Document ID
- Society of Petrophysicists and Well-Log Analysts
- Publication Date
- August 2018
- Document Type
- Journal Paper
- 429 - 438
- 2018. Society of Petrophysicists & Well Log Analysts
- 7 in the last 30 days
- 95 since 2007
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Over the entire life cycle of a well there is a concentrated focus on well integrity, specifically through leak detection. Hydrophones mounted on a downhole chassis enable the extraction and transmission of acoustic-signal data used to detect potential leaks in wellbores. By suitably processing the acoustic signals, the location, phase, and rate of the leak flow can be estimated using models based on theory and empirical data. The model presented in this paper proposes a direct relation between flow rate and acoustic amplitude by combining their dependence on fluid properties and environmental parameters, such as pressure and temperature. Experiments were conducted for various leak scenarios for a wide range of differential pressures to obtain acoustic amplitudes. The proposed model was calibrated in two steps: (1) A numerical wave-propagation model was used to convert the acoustic amplitude for the leak geometry used in experiment to an equivalent in free space, and (2) partial experimental data were used to obtain coefficients for the proposed model. The model was validated by comparing its flow-rate predictions with the rest of the experimental data. Statistics for the accuracy and success rate of the predictions of the proposed model are provided.
Well integrity is imperative during the entire life cycle of a well. Leak-detection tools provide effective means to monitor and enhance well integrity through timely intervention. The rate of the leak flow can be estimated using models based on turbulence theory and empirical data. Most existing models consider leak flow rate to be a function of acoustic amplitude and pressure differential across the leak. This paper introduces an improved aero/hydro acoustic model using input from fluid dynamics.
|File Size||11 MB||Number of Pages||10|