Robust Multiphase-Split Calculations Based on Improved Successive Substitution Schemes
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F24%3A00379253" target="_blank" >RIV/68407700:21340/24:00379253 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.2118/219490-PA" target="_blank" >https://doi.org/10.2118/219490-PA</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.2118/219490-PA" target="_blank" >10.2118/219490-PA</a>
Alternative languages
Result language
angličtina
Original language name
Robust Multiphase-Split Calculations Based on Improved Successive Substitution Schemes
Original language description
Successful large- scale compositional reservoir simulations require robust and efficient phase- split calculations. In recent years, there has been progress in three- phase- split calculations. However, there may be convergence issues when the number of equilibrium phases increases to four. Part of the problem is from the poor initial guesses. In phase- split computations, the results from stability provide good initial guesses. Successive substitution (SS) is a key step in phase- split calculations. The method, if efficient, can provide good initial guesses for the final step, the Newton method that has a rapid rate of convergence. In this contribution, we present a robust algorithm with high efficiency and robustness in phase- split calculations in two, three, and four phases. We find that a key step is the SS. The convergence may even be very slow away from the critical point and phase boundaries. A modified SS is used which may reduce the number of iterations many times. In the course of this investigation, we observe some regions often inside the phase envelopes (far from the phase boundary or critical points) with a very high number of SS iterations. The adoption of the improved SS iterations leads to a significant speedup of the multiphase- split computations. In some mixtures, the average reduction is more than 70%.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10102 - Applied mathematics
Result continuities
Project
—
Continuities
S - Specificky vyzkum na vysokych skolach
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Society of Petroleum Engineers journal
ISSN
1086-055X
e-ISSN
1930-0220
Volume of the periodical
29
Issue of the periodical within the volume
7
Country of publishing house
US - UNITED STATES
Number of pages
16
Pages from-to
3702-3717
UT code for WoS article
001274982500005
EID of the result in the Scopus database
2-s2.0-85198837240