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An Analytical Production Model for Primary Production and Cyclic Solvent Injection in a Heavy-Oil Reservoir

Authors
Hongze Ma (University of Regina) | Gaoming Yu (Yangtze University) | Yuehui She (Yangtze University) | Yongan Gu (University of Regina)
DOI
https://doi.org/10.2118/195697-PA
Document ID
SPE-195697-PA
Publisher
Society of Petroleum Engineers
Source
SPE Journal
Volume
Preprint
Issue
Preprint
Publication Date
July 2019
Document Type
Journal Paper
Language
English
ISSN
1086-055X
Copyright
2019.Society of Petroleum Engineers
Keywords
cyclic solvent injection (CSI), foamy-oil flow and solution-gas drive, material balance model (MBM)
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294 since 2007
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Summary

In this paper, we formulated an analytical material-balance model (MBM) to predict cumulative heavy-oil and gas-production data, as well as the average reservoir pressures, during the primary production and subsequent cyclic solvent injection (CSI) in a heavy-oil reservoir. The theoretical MBM considers the nonequilibrium foamy-oil phase behavior and foamy-oil flow by invoking two kinetic equations with nucleation and decay coefficients. In addition, we conducted four laboratory sandpack tests of the primary production and subsequent CSI to validate the new production model. It was found that the predicted cumulative heavy-oil production data and average reservoir pressures agreed reasonably well with the measured data during the primary production and subsequent CSI. However, there were large discrepancies between the predicted and measured cumulative gas-production data in the CSI owing to its strong gas channeling, which is a major technical issue to be studied further. Moreover, dissolved CH4 in the heavy oil became dispersed CH4 bubbles more quickly when the nucleation coefficient was larger at a higher pressure-drawdown rate or in less-viscous heavy oil. The foamy heavy oil with dispersed CH4 bubbles was more stable when the decay coefficient was smaller at a higher pressure-drawdown rate or in more-viscous heavy oil. It was also found that the foamy-oil isothermal compressibility increased by 10 to 1,000 times and that the dispersed-gas percentage in the foamy oil could reach as high as 14 vol% during the primary production. The foamy-oil viscosity was reduced by 36 to 55%, and the solution CH4/heavy-oil ratio was decreased by 41 to 76% at the end of the CSI.

File Size  533 KBNumber of Pages   16

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