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Determining the fluids distribution in the pore space of core samples by centrifuge tests

Authors: I.V. Yazynina, E.V. Shelyago (Gubkin Russian State University of Oil and Gas, RF, Moscow), A.D. Kurochkin (VNIIneft OAO, RF, Moscow)

Key words: wettability, capillary pressure, centrifuge, drainage, imbibition, pore distribution, saturation, core.

The article describes a new experimental method for determining the oil and water distribution in the pore space of core samples. The authors present a comparison of processes of drainage and capillary imbibition. Evaluation of existing methodologies is provided. The method and device of modern ultracentrifuge is described.

References
1. Fedortsov V.K., Methods of selecting the tested zone in terrigenous hydrophilic reservoirs of exploration wells (In Russ.), Collected papers “Geologopromyslovye metody izucheniya polimiktovykh kollektorov Zapadnoy Sibiri” (Geological and field methods for studying the polymictic collectors of Western Siberia), Proceedings of ZapSibNIGNI, 1990, V. 151, pp. 25-44.
2. Mikhaylov N.N., Sechina L.S., The role of adsorbed fluids in the evaluation of the effectiveness of enhanced oil recovery methods (In Russ.), Proceedings
of IV International Scientific Symposium “Teoriya i praktika primeneniya
metodov uvelicheniya nefteotdachi plastov” (Theory and practice of enhanced
oil recovery methods), Part 2, Moscow: Publ. of VNIIneft', 2013,
pp. 14–17.
3. Abramzon A.A., Poverkhnostno-aktivnye veshchestva. Svoystva i primenenie (Surfactants. Properties and Applications), Leningrad: Khimiya Publ., 1975, 248 p.
4. Gudok N.S., Bogdanovich N.N., Martynov V.G., Opredelenie fizicheskikh
svoystv neftevodosoderzhashchikh porod (Determination of physical properties of the oil-water-bearing rocks), Moscow: Nedra Publ., 2007, 592 p.
5. Tul'bovich B.I., Metody izucheniya porod-kollektorov nefti i gaza (Methods
of study of oil and gas bearing reservoir rocks), Moscow: Nedra Publ., 1979,
199 p.
6. Slobod R.L., Chambers A., Prehn W.L., Use of centrifuge for determining
connate water, residual oil and capillary curves of small core samples, Trans.
of AIME, 1951, V. 192, pp. 127.
7. Khanin A.A., Porody-kollektory nefti i gaza i ikh izuchenie (Reservoir rocks of oil and gas and their study), Moscow: Nedra Publ., 1976, 295 p. 

Key words: wettability, capillary pressure, centrifuge, drainage, imbibition, pore distribution, saturation, core.

The article describes a new experimental method for determining the oil and water distribution in the pore space of core samples. The authors present a comparison of processes of drainage and capillary imbibition. Evaluation of existing methodologies is provided. The method and device of modern ultracentrifuge is described.

References
1. Fedortsov V.K., Methods of selecting the tested zone in terrigenous hydrophilic reservoirs of exploration wells (In Russ.), Collected papers “Geologopromyslovye metody izucheniya polimiktovykh kollektorov Zapadnoy Sibiri” (Geological and field methods for studying the polymictic collectors of Western Siberia), Proceedings of ZapSibNIGNI, 1990, V. 151, pp. 25-44.
2. Mikhaylov N.N., Sechina L.S., The role of adsorbed fluids in the evaluation of the effectiveness of enhanced oil recovery methods (In Russ.), Proceedings
of IV International Scientific Symposium “Teoriya i praktika primeneniya
metodov uvelicheniya nefteotdachi plastov” (Theory and practice of enhanced
oil recovery methods), Part 2, Moscow: Publ. of VNIIneft', 2013,
pp. 14–17.
3. Abramzon A.A., Poverkhnostno-aktivnye veshchestva. Svoystva i primenenie (Surfactants. Properties and Applications), Leningrad: Khimiya Publ., 1975, 248 p.
4. Gudok N.S., Bogdanovich N.N., Martynov V.G., Opredelenie fizicheskikh
svoystv neftevodosoderzhashchikh porod (Determination of physical properties of the oil-water-bearing rocks), Moscow: Nedra Publ., 2007, 592 p.
5. Tul'bovich B.I., Metody izucheniya porod-kollektorov nefti i gaza (Methods
of study of oil and gas bearing reservoir rocks), Moscow: Nedra Publ., 1979,
199 p.
6. Slobod R.L., Chambers A., Prehn W.L., Use of centrifuge for determining
connate water, residual oil and capillary curves of small core samples, Trans.
of AIME, 1951, V. 192, pp. 127.
7. Khanin A.A., Porody-kollektory nefti i gaza i ikh izuchenie (Reservoir rocks of oil and gas and their study), Moscow: Nedra Publ., 1976, 295 p. 


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