Tie-Simplex-Based Phase Behavior Modeling in an IMPEC Reservoir Simulator

2013 ◽  
Author(s):  
M. Rezaveisi ◽  
K. Sepehrnoori ◽  
R.T. Johns
Keyword(s):  
Phase Behavior ◽  
Behavior Modeling ◽  
Reservoir Simulator

Tie-Simplex-Based Phase-Behavior Modeling in an IMPEC Reservoir Simulator

SPE Journal ◽  
2013 ◽  
Vol 19 (02) ◽  
pp. 327-339 ◽  
Author(s):  
M.. Rezaveisi ◽  
K.. Sepehrnoori ◽  
R.T.. T. Johns
Keyword(s):  
Stability Analysis ◽  
Phase Behavior ◽  
Single Phase ◽  
Potential Method ◽  
Phase Region ◽  
Behavior Modeling ◽  
Computational Time ◽  
University Of Texas ◽  
Fully Implicit ◽  
Reservoir Simulator

Summary Recently, tie-simplex-based phase-behavior modeling in reservoir simulators has been applied and investigated as a potential method for improving the computational speed of equation-of-state (EOS) -based reservoir simulators. We implemented compositional-space adaptive tabulation (CSAT), the most promising tie-simplex-based method, in UTCOMP, the University of Texas' in-house IMPEC compositional reservoir simulator, to investigate its computational efficiency compared with the phase-behavior algorithm in UTCOMP. The results show that applying CSAT only to skip stability analysis does improve computational time, but only when a significant portion of the gridblocks are in the single-phase region and no other technique for avoiding stability analysis is used. However, in most cases, there is little or no computational advantage to use of CSAT when the simple option in UTCOMP is used where stability analysis is skipped for blocks surrounded by single-phase regions. We explore in detail the performance of CSAT, which depends significantly on the specific gas flood modeled, and the number of tie-lines generated during adaptive tabulation. The results shed light on applicability of CSAT in the IMPEC-type compositional reservoir simulators and show that the advantages of CSAT in this type of simulator are not as great as are reported in the literature for fully implicit or adaptive implicit formulations.

scholarly journals Curvature-Based Equation of State for Microemulsion-Phase Behavior

SPE Journal ◽  
2018 ◽  
Vol 24 (02) ◽  
pp. 647-659 ◽  
Author(s):  
V. A. Torrealba ◽  
R. T. Johns ◽  
H.. Hoteit
Keyword(s):  
Equation Of State ◽  
Phase Behavior ◽  
Oil Recovery ◽  
Industrial Applications ◽  
Data Availability ◽  
Behavior Modeling ◽  
Average Curvature ◽  
Wide Range ◽  
Definition Of ◽  
Spheroidal Geometry

Summary An accurate description of the microemulsion-phase behavior is critical for many industrial applications, including surfactant flooding in enhanced oil recovery (EOR). Recent phase-behavior models have assumed constant-shaped micelles, typically spherical, using net-average curvature (NAC), which is not consistent with scattering and microscopy experiments that suggest changes in shapes of the continuous and discontinuous domains. On the basis of the strong evidence of varying micellar shape, principal micellar curves were used recently to model interfacial tensions (IFTs). Huh's scaling equation (Huh 1979) also was coupled to this IFT model to generate phase-behavior estimates, but without accounting for the micellar shape. In this paper, we present a novel microemulsion-phase-behavior equation of state (EoS) that accounts for changing micellar curvatures under the assumption of a general-prolate spheroidal geometry, instead of through Huh's equation. This new EoS improves phase-behavior-modeling capabilities and eliminates the use of NAC in favor of a more-physical definition of characteristic length. Our new EoS can be used to fit and predict microemulsion-phase behavior irrespective of IFT-data availability. For the cases considered, the new EoS agrees well with experimental data for scans in both salinity and composition. The model also predicts phase-behavior data for a wide range of temperature and pressure, and it is validated against dynamic scattering experiments to show the physical significance of the approach.

Thermodynamic Analysis of Phase Behavior at High Capillary Pressure

SPE Journal ◽  
2018 ◽  
Vol 23 (06) ◽  
pp. 1977-1990 ◽  
Author(s):  
Mohsen Rezaveisi ◽  
Kamy Sepehrnoori ◽  
Gary A. Pope ◽  
Russell T. Johns
Keyword(s):  
Phase Behavior ◽  
Capillary Pressure ◽  
Thermodynamic Analysis ◽  
Phase Stability ◽  
Tangent Plane ◽  
General Purpose ◽  
Distance Method ◽  
Capillary Equilibrium ◽  
Production Behavior ◽  
Reservoir Simulator

Summary High capillary pressure has a significant effect on the phase behavior of fluid mixtures. The capillary pressure is high in unconventional reservoirs because of the small pores in the rock, so understanding the effect of capillary pressure on phase behavior is necessary for reliable modeling of unconventional shale-gas and tight-oil reservoirs. As the main finding of this paper, first we show that the tangent-plane-distance method cannot be used to determine phase stability and present a rigorous thermodynamic analysis of the problem of phase stability with capillary pressure. Second, we demonstrate that there is a maximum capillary pressure (Pcmax) where calculation of capillary equilibrium using bulk-phase thermodynamics is possible and derive the necessary equations to obtain this maximum capillary pressure. We also briefly discuss the implementation of the capillary equilibrium in a general-purpose compositional reservoir simulator. Two simulation case studies for synthetic gas condensate reservoirs were performed to illustrate the influence of capillary pressure on production behavior for the fluids studied.

Phase behavior modeling of asphaltene precipitation utilizing RBF-ANN approach

2019 ◽  
Vol 37 (16) ◽  
pp. 1861-1867 ◽  
Author(s):  
Mohammad Navid Kardani ◽  
Alireza Baghban ◽  
Mohammad Ehsan Hamzehie ◽  
Mohammad Baghban
Keyword(s):  
Phase Behavior ◽  
Behavior Modeling ◽  
Asphaltene Precipitation

Towards accurate phase behavior modeling for hydrogen sulfide/water mixtures

2020 ◽  
Vol 521 ◽  
pp. 112691
Author(s):  
Shiyu Yin ◽  
Zhiyuan Wang ◽  
Chang Lu ◽  
Huazhou Li
Keyword(s):  
Hydrogen Sulfide ◽  
Phase Behavior ◽  
Behavior Modeling

Phase Behavior Modeling of Bitumen and Light Normal Alkanes and CO2 by PR-EOS and CPA-EOS

2015 ◽  
Vol 30 (1) ◽  
pp. 515-525 ◽  
Author(s):  
Tereza Jindrová ◽  
Jiří Mikyška ◽  
Abbas Firoozabadi
Keyword(s):  
Phase Behavior ◽  
Behavior Modeling ◽  
Normal Alkanes
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