Mechanistic modelling of counter-current slug flows in vertical annuli

Firouzi,Mahshid, Towler, Brian and Rufford, Thomas (2015). Mechanistic modelling of counter-current slug flows in vertical annuli. In: SPE Asia Pacific Unconventional Resources Conference and Exhibition, Brisbane, QLD, Australia, (). 9-11 November 2015. doi:10.2118/176885-MS


Author Firouzi,Mahshid
Towler, Brian
Rufford, Thomas
Title of paper Mechanistic modelling of counter-current slug flows in vertical annuli
Conference name SPE Asia Pacific Unconventional Resources Conference and Exhibition
Conference location Brisbane, QLD, Australia
Conference dates 9-11 November 2015
Convener Stephen Kelemen
Journal name Society of Petroleum Engineers - SPE Asia Pacific Unconventional Resources Conference and Exhibition
Place of Publication Richardson, TX, United States
Publisher Society of Petroleum Engineers (SPE)
Publication Year 2015
Sub-type Fully published paper
DOI 10.2118/176885-MS
Open Access Status Not Open Access
ISBN 9781613993880
Total pages 14
Language eng
Abstract/Summary A range of mathematical models and correlations is used to estimate the pressure drop for co-current two-phase flows in vertical wells in the conventional oil and gas industry. However, in the annulus between casing and tubing of a coal seam gas (CSG) well, the upward flow of gas and downward flow of water results in counter-current two-phase flows. The flow regimes developed in such a counter-current system are noticeably different to co-current flow regimes, and thus the existing models used to predict pressure profiles in co-current wells do not adequately describe two phase flows in a (pumped) CSG well. In this study, we modified existing mechanistic models for co-current flow and counter-current flow in a pipe to predict liquid holdup and pressure profiles of counter-current flows in vertical annuli for the slug flow, which is the dominant flow regime. A model, based on the work of Taitel and Barnea (1983), was also developed to predict the transition from slug flow to annular flow in counter-current flows in annuli. Our comparison of the pressure profiles of co-current and counter-current flows in annuli for the slug flow regime indicates that the pressure loss of counter-current flows could be appreciably different to that in co-current flows under the same conditions. This highlights the need to modify the models that are currently applied in typical commercial well flow simulators to better predict the pressure drop across CSG wells.
Keyword Two-phase flow
Countercurrent
Slug regime
Annuli
Pressure drop
Q-Index Code EX
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Conference Paper
Collections: School of Chemical Engineering Publications
Non HERDC
 
Versions
Version Filter Type
Citation counts: Scopus Citation Count Cited 1 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Mon, 30 Nov 2015, 19:04:55 EST by Dr Thomas Rufford on behalf of School of Chemical Engineering