The use of mobile metering station and formation fluid test unit for translation of produced volume of unstable condensate to stable condensate volume

UDK: 622.276.8
Key words: mobile metering station, formation fluid test station, gas condensate production, unstable condensate quantity, translation of produced unstable condensate volume to stable condensate volume, severance tax, unstable condensate shrinkage volume factor
Authors: S.V. Panteleev, A.S. Khoroshev (Giprovostokneft JSC, RF, Samara), V.I. Falovsky (Samara State Technical University, RF, Samaha)

When gas condensate and oil come from wells into field gathering system it is difficult to obtain reliable data on the volume of stable condensate and oil because direct measurement of stable condensate volume is impossible. It is necessary to know exact volume of gas condensate so that severance tax could be applied to condensate, not to oil.

To resolve the problem, unstable condensate volume change test was developed. Amount of unstable condensate is measured at wellhead by mobile test separator. The work included three stages: field tests; laboratory tests of gas and unstable condensate samples; systematization and generalization of materials obtained during first two stages. It was discovered that shrinkage factor is related to well parameters. The relationship was established empirically. For better correlation of field tests and laboratory test of different well samples, results were adjusted using correction system. Adjustments and statistical analysis of test results were embodied in the analytical form. Obtained materials help evaluate the difference of gas amount in unstable condensate calculated by formula, and actual gas amount discovered in samples from mobile test separator. Correlation was found between experimental data and test results of field laboratory. This will allow the use of mobile test separator to establish shrinkage volume factors for all producing wells.
References
1. Gritsenko A.I., Aliev Z.S., Ermilov O.M. et al., Rukovodstvo po issledovaniyu
skvazhin (Guidance on the study of wells), Moscow: Nauka Publ., 1995, 523 p.
2. Stepanova G.S., Fazovye prevrashcheniya uglevodorodnykh smesey
gazokondensatnykh mestorozhdeniy (Phase transformations of hydrocarbon
mixtures of gas condensate fields), Moscow: Nedra Publ., 1974, 224 p.
3. Namiot A.Yu., Fazovye ravnovesiya v dobyche nefti (Phase equilibria in oil
production), Moscow: Nedra Publ., 1976, 183 p.
4. 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.
5. Katz D.L., Cornell D., Kobayashi R., Poettmann F.H., Vary J.A., Elenbaas J.R.,
Weinaug C.F., Properties of natural gases and volatile hydrocarbon liquids, In:
Handbook of natural gas engineering, New York: McGraw-Hill, 1959.
6. Zaydel' A.N., Oshibki izmereniy fizicheskikh velichin (Measurement errors of
physical quantities), Leningrad: Nauka Publ., 1974, 108 p.

When gas condensate and oil come from wells into field gathering system it is difficult to obtain reliable data on the volume of stable condensate and oil because direct measurement of stable condensate volume is impossible. It is necessary to know exact volume of gas condensate so that severance tax could be applied to condensate, not to oil.

To resolve the problem, unstable condensate volume change test was developed. Amount of unstable condensate is measured at wellhead by mobile test separator. The work included three stages: field tests; laboratory tests of gas and unstable condensate samples; systematization and generalization of materials obtained during first two stages. It was discovered that shrinkage factor is related to well parameters. The relationship was established empirically. For better correlation of field tests and laboratory test of different well samples, results were adjusted using correction system. Adjustments and statistical analysis of test results were embodied in the analytical form. Obtained materials help evaluate the difference of gas amount in unstable condensate calculated by formula, and actual gas amount discovered in samples from mobile test separator. Correlation was found between experimental data and test results of field laboratory. This will allow the use of mobile test separator to establish shrinkage volume factors for all producing wells.
References
1. Gritsenko A.I., Aliev Z.S., Ermilov O.M. et al., Rukovodstvo po issledovaniyu
skvazhin (Guidance on the study of wells), Moscow: Nauka Publ., 1995, 523 p.
2. Stepanova G.S., Fazovye prevrashcheniya uglevodorodnykh smesey
gazokondensatnykh mestorozhdeniy (Phase transformations of hydrocarbon
mixtures of gas condensate fields), Moscow: Nedra Publ., 1974, 224 p.
3. Namiot A.Yu., Fazovye ravnovesiya v dobyche nefti (Phase equilibria in oil
production), Moscow: Nedra Publ., 1976, 183 p.
4. 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.
5. Katz D.L., Cornell D., Kobayashi R., Poettmann F.H., Vary J.A., Elenbaas J.R.,
Weinaug C.F., Properties of natural gases and volatile hydrocarbon liquids, In:
Handbook of natural gas engineering, New York: McGraw-Hill, 1959.
6. Zaydel' A.N., Oshibki izmereniy fizicheskikh velichin (Measurement errors of
physical quantities), Leningrad: Nauka Publ., 1974, 108 p.


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