Evaluation of black-oil PVT-model applicability for simulation of gas-condensate reservoirs

Creation of geological and simulation models is the necessary condition for decision making towards current development status, planning of well interventions, field development planning and forecasting. In case of isothermal process, for proper phase behavior and phase transitions two key approache...

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Main Authors: O. V. Burachok, D. V. Pershyn, S. V. Matkivskyi, O. R. Kondrat
Format: Article
Language:English
Published: Ukrainian State Geological Research Institute (UkrSGRI) 2020-08-01
Series:Мінеральні ресурси України
Subjects:
Online Access:https://mru-journal.com.ua/index.php/mru/article/view/277
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spelling doaj-efa9d50b1dcc4ba3b3d17b265ee1aab22021-06-24T18:59:51ZengUkrainian State Geological Research Institute (UkrSGRI)Мінеральні ресурси України1682-721X2707-86982020-08-012434810.31996/mru.2020.2.43-48277Evaluation of black-oil PVT-model applicability for simulation of gas-condensate reservoirsO. V. Burachok0D. V. Pershyn1S. V. Matkivskyi2O. R. Kondrat3Ivano-Frankivsk National Technical University of Oil and GasUkrainian Scientific-Research Institute of Natural GasesUkrainian Scientific-Research Institute of Natural GasesIvano-Frankivsk National Technical University of Oil and GasCreation of geological and simulation models is the necessary condition for decision making towards current development status, planning of well interventions, field development planning and forecasting. In case of isothermal process, for proper phase behavior and phase transitions two key approaches are used: a) simplified model of non-volatile oil, so called “black oil” model, in which each phase – oil, water and gas, are represented by respective component, and solution to fiow equations is based on finding the saturations and pressures in each numerical cell, and change of reservoir fiuid properties is defined in table form as a function of pressure; b) compositional model, in which based on equation of state, phase equilibrium is calculated for hydrocarbon and non-hydrocarbon components, and during fiow calculations, apart from saturations and pressures, oil and gas mixture is brought to phase equilibrium, and material balance is calculated for each component in gas and liquid phase. To account for components volatility, the classic black oil model was improved by adding to the formulation gas solubility and vaporized oil content. This allows its application for the majority of oil and gas reservoirs, which are far from critical point and in which the phase transitions are insignificant. Due to smaller number of variables, numerical solution is simpler and faster. But, considering the importance and relevance of increasing the production of Ukrainian gas and optimization of gas-condensate fields development, the issue of simplified black oil PVT-model application for phase behavior characterization of gas-condensate reservoirs produced under natural depletion depending on the liquid hydrocarbon’s potential yield. Comparative study results on evaluation of production performance of synthetic reservoir for different synthetically-generated reservoir fiuids with different С5+ potential yield is provided as plots and tables. Based on the results the limit of simplified black oil PVT-model application and the moment of transition to compositional model for more precise results could be defined.https://mru-journal.com.ua/index.php/mru/article/view/277pvt-modelcompositional modelblack oil modelgas-condensate reservoir development
collection DOAJ
language English
format Article
sources DOAJ
author O. V. Burachok
D. V. Pershyn
S. V. Matkivskyi
O. R. Kondrat
spellingShingle O. V. Burachok
D. V. Pershyn
S. V. Matkivskyi
O. R. Kondrat
Evaluation of black-oil PVT-model applicability for simulation of gas-condensate reservoirs
Мінеральні ресурси України
pvt-model
compositional model
black oil model
gas-condensate reservoir development
author_facet O. V. Burachok
D. V. Pershyn
S. V. Matkivskyi
O. R. Kondrat
author_sort O. V. Burachok
title Evaluation of black-oil PVT-model applicability for simulation of gas-condensate reservoirs
title_short Evaluation of black-oil PVT-model applicability for simulation of gas-condensate reservoirs
title_full Evaluation of black-oil PVT-model applicability for simulation of gas-condensate reservoirs
title_fullStr Evaluation of black-oil PVT-model applicability for simulation of gas-condensate reservoirs
title_full_unstemmed Evaluation of black-oil PVT-model applicability for simulation of gas-condensate reservoirs
title_sort evaluation of black-oil pvt-model applicability for simulation of gas-condensate reservoirs
publisher Ukrainian State Geological Research Institute (UkrSGRI)
series Мінеральні ресурси України
issn 1682-721X
2707-8698
publishDate 2020-08-01
description Creation of geological and simulation models is the necessary condition for decision making towards current development status, planning of well interventions, field development planning and forecasting. In case of isothermal process, for proper phase behavior and phase transitions two key approaches are used: a) simplified model of non-volatile oil, so called “black oil” model, in which each phase – oil, water and gas, are represented by respective component, and solution to fiow equations is based on finding the saturations and pressures in each numerical cell, and change of reservoir fiuid properties is defined in table form as a function of pressure; b) compositional model, in which based on equation of state, phase equilibrium is calculated for hydrocarbon and non-hydrocarbon components, and during fiow calculations, apart from saturations and pressures, oil and gas mixture is brought to phase equilibrium, and material balance is calculated for each component in gas and liquid phase. To account for components volatility, the classic black oil model was improved by adding to the formulation gas solubility and vaporized oil content. This allows its application for the majority of oil and gas reservoirs, which are far from critical point and in which the phase transitions are insignificant. Due to smaller number of variables, numerical solution is simpler and faster. But, considering the importance and relevance of increasing the production of Ukrainian gas and optimization of gas-condensate fields development, the issue of simplified black oil PVT-model application for phase behavior characterization of gas-condensate reservoirs produced under natural depletion depending on the liquid hydrocarbon’s potential yield. Comparative study results on evaluation of production performance of synthetic reservoir for different synthetically-generated reservoir fiuids with different С5+ potential yield is provided as plots and tables. Based on the results the limit of simplified black oil PVT-model application and the moment of transition to compositional model for more precise results could be defined.
topic pvt-model
compositional model
black oil model
gas-condensate reservoir development
url https://mru-journal.com.ua/index.php/mru/article/view/277
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AT orkondrat evaluationofblackoilpvtmodelapplicabilityforsimulationofgascondensatereservoirs
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