Robust Multiphase-Split Calculations Based on Improved Successive Substitution Schemes

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Robust Multiphase-Split Calculations Based on Improved Successive Substitution Schemes

Popis výsledku v původním jazyce

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%.

Název v anglickém jazyce

Robust Multiphase-Split Calculations Based on Improved Successive Substitution Schemes

Popis výsledku anglicky

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%.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10102 - Applied mathematics

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Society of Petroleum Engineers journal

ISSN

1086-055X

e-ISSN

1930-0220

Svazek periodika

29

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

16

Strana od-do

3702-3717

Kód UT WoS článku

001274982500005

EID výsledku v databázi Scopus

2-s2.0-85198837240