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Effective method for creating and adapting PVT-model of reservoir fluid of gas-condensate deposits and gas cap for oil-gas-condensate reservoirs

Authors: T.S. Yushchenko, A.I. Brusilovsky (Gazpromneft NTC LLC, RF, Saint-Petersburg)

Key words: reservoir gas condensate mixture, pVT-model, equation-of-state, gas-oil ratio, z-factor, CVD process.

The article is considering a new engineering method for creating PVT-models of natural gas condensate mixtures. The method can be applied for fluids of gas condensate reservoirs and gas cap of two-phase deposits. The method is based on the reproducing of the results of field measurements and basic laboratory studies of representative samples in thermodynamic modeling using equation of state. The procedure of equation of state parameters consequent setting was developed. PVT-models created on the base of the proposed method, provide reliable information on the properties of a reservoir fluid in development of flow simulation both using a reservoir simulation compositional models and using pseudo models “black oil” with “wet gas”. The method is illustrated by the example of creation of the adequate PVT-models of various regions of Russia reservoir condensate field’s mixtures.
References
1. Tokarev D.K., Fateev D.G., Kozubovskiy A.G., Efimov A.D., Adaptation
scheme of creation of adequate models of gas-condensate systems (for example, the Achimov deposits of the Urengoy gas condensate field) (In Russ.), Territoriya Neftegaz, 2012, no. 12, pp. 46-53.
2. Brusilovskiy A.I., The methodology of the application of cubic state equations for the simulation of natural gas condensate mixtures (In Russ.), Gazovaya promyshlennost' = GAS Industry of Russia, 2004, no. 4, pp.16-19.
3. Shchebetov A.V., Galkin M.V., Quality assessment and modeling of gas
condensate studies in conditions of input data uncertainty (In Russ.), Gazovaya promyshlennost' = GAS Industry of Russia, 2009, no. 9, pp. 40-44.
4. Aguilar Z.R., McCain W.D. Jr., An efficient tuning strategy to calibrate cubic EOS for compositional simulation, SPE 77382, 2002.
5. Schebetov A., Rimoldi A., Piana M., Quality check of gas-condensate PVT
studies and Eos modeling under input data uncertainty, SPE 133258, 2010.
6. Hosein R., McCain W.D. Jr., Extended analysis for gas condensate systems,
SPE Reservoir Evalution and Engineering, 2009.
7. Joergensen M., Stenby E.H., Optimization of pseudo-component selection
for compositional studies of reservoir fluids, SPE 30789, 1995.
8. Brusilovskiy A.I., Nugaeva A.N., Khvatova I.E., A rational approach to the formation of reservoir oils models for hydrodynamic calculations in the design
and monitoring of field development (In Russ.) Vestnik TsKR Rosnedra, 2009, no. 4, pp. 48-57.
9. Whitson C.H., Characteristing hydrocarbon plus fraction, SPE. – 1983.
10. R Gazprom 2-3, 3-303-2009, Rukovodstvo po issledovaniyu prirodnykh
gazokondensatnykh sistem s tsel'yu podscheta balansovykh i izvlekaemykh
zapasov komponentov prirodnogo gaza, proektirovaniya, analiza i kontrolya
za razrabotkoy mestorozhdeniy OAO “Gazprom” (Guidelines for the study of
natural gas condensate systems for calculate the balance and recoverable
reserves of natural gas components, design, analysis and monitoring of development of Gazprom's fields), Moscow: Publ. of Gazprom, 2009, 39 p.
11. Brusilovskiy A.I., Fazovye prevrashcheniya pri razrabotke mestorozhdeniy nefti i gaza (Phase transformations in the development of oil and gas fields), Moscow: Graal' Publ., 2002, 575 p.
12. Poroskun V.I., Gabrielyants G.A., Podturkin Yu.A. et al., Principles of classification and accounting of reserves and resources of oil and combustible
gases (In Russ.), Annex to the journal “Nedropol'zovanie XXI vek”, 2007, 40 p.
13. Whitson C.H., Fevang O., Yang T., Gas condensate PVT – What’s really important and Why, IBC conference Optimisation of gas condensate fields,
London, 1999.
14. Whitson C.H., Brule M.R., Phase behavior, SPE, 2000.

Key words: reservoir gas condensate mixture, pVT-model, equation-of-state, gas-oil ratio, z-factor, CVD process.

The article is considering a new engineering method for creating PVT-models of natural gas condensate mixtures. The method can be applied for fluids of gas condensate reservoirs and gas cap of two-phase deposits. The method is based on the reproducing of the results of field measurements and basic laboratory studies of representative samples in thermodynamic modeling using equation of state. The procedure of equation of state parameters consequent setting was developed. PVT-models created on the base of the proposed method, provide reliable information on the properties of a reservoir fluid in development of flow simulation both using a reservoir simulation compositional models and using pseudo models “black oil” with “wet gas”. The method is illustrated by the example of creation of the adequate PVT-models of various regions of Russia reservoir condensate field’s mixtures.
References
1. Tokarev D.K., Fateev D.G., Kozubovskiy A.G., Efimov A.D., Adaptation
scheme of creation of adequate models of gas-condensate systems (for example, the Achimov deposits of the Urengoy gas condensate field) (In Russ.), Territoriya Neftegaz, 2012, no. 12, pp. 46-53.
2. Brusilovskiy A.I., The methodology of the application of cubic state equations for the simulation of natural gas condensate mixtures (In Russ.), Gazovaya promyshlennost' = GAS Industry of Russia, 2004, no. 4, pp.16-19.
3. Shchebetov A.V., Galkin M.V., Quality assessment and modeling of gas
condensate studies in conditions of input data uncertainty (In Russ.), Gazovaya promyshlennost' = GAS Industry of Russia, 2009, no. 9, pp. 40-44.
4. Aguilar Z.R., McCain W.D. Jr., An efficient tuning strategy to calibrate cubic EOS for compositional simulation, SPE 77382, 2002.
5. Schebetov A., Rimoldi A., Piana M., Quality check of gas-condensate PVT
studies and Eos modeling under input data uncertainty, SPE 133258, 2010.
6. Hosein R., McCain W.D. Jr., Extended analysis for gas condensate systems,
SPE Reservoir Evalution and Engineering, 2009.
7. Joergensen M., Stenby E.H., Optimization of pseudo-component selection
for compositional studies of reservoir fluids, SPE 30789, 1995.
8. Brusilovskiy A.I., Nugaeva A.N., Khvatova I.E., A rational approach to the formation of reservoir oils models for hydrodynamic calculations in the design
and monitoring of field development (In Russ.) Vestnik TsKR Rosnedra, 2009, no. 4, pp. 48-57.
9. Whitson C.H., Characteristing hydrocarbon plus fraction, SPE. – 1983.
10. R Gazprom 2-3, 3-303-2009, Rukovodstvo po issledovaniyu prirodnykh
gazokondensatnykh sistem s tsel'yu podscheta balansovykh i izvlekaemykh
zapasov komponentov prirodnogo gaza, proektirovaniya, analiza i kontrolya
za razrabotkoy mestorozhdeniy OAO “Gazprom” (Guidelines for the study of
natural gas condensate systems for calculate the balance and recoverable
reserves of natural gas components, design, analysis and monitoring of development of Gazprom's fields), Moscow: Publ. of Gazprom, 2009, 39 p.
11. Brusilovskiy A.I., Fazovye prevrashcheniya pri razrabotke mestorozhdeniy nefti i gaza (Phase transformations in the development of oil and gas fields), Moscow: Graal' Publ., 2002, 575 p.
12. Poroskun V.I., Gabrielyants G.A., Podturkin Yu.A. et al., Principles of classification and accounting of reserves and resources of oil and combustible
gases (In Russ.), Annex to the journal “Nedropol'zovanie XXI vek”, 2007, 40 p.
13. Whitson C.H., Fevang O., Yang T., Gas condensate PVT – What’s really important and Why, IBC conference Optimisation of gas condensate fields,
London, 1999.
14. Whitson C.H., Brule M.R., Phase behavior, SPE, 2000.


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