The research of composition, properties and dehydration kinetics of oils in the East Siberian petroleum province

UDK: 665.622.4
DOI: 10.24887/0028-2448-2020-9-63-67
Key words: emulsion, dehydration, Lumifuge device, asphaltenes, instability, resins, oil, kinetics, chemical composition, Eastern Siberia
Authors: I.P. Lebedeva (Irkutsk Oil Company LLC, RF, Irkutsk), Yu.A. Dobrzhanskaya (Irkutsk Oil Company LLC, RF, Irkutsk), A.V. Evseyenko (Irkutsk Oil Company LLC, RF, Irkutsk), E.V. Shakirova (Irkutsk National Research Technical University, RF, Irkutsk), N.A. Buglov (Irkutsk National Research Technical University, RF, Irkutsk), O.V. Belozerova (Irkutsk National Research Technical University, RF, Irkutsk)

Oil production is inevitably accompanied by the formation of oil-water emulsions, and the main task in the oil field treatment is oil-water emulsions separation. Oil emulsions significantly affect the technological processes of separation, preliminary dehydration, demulsification and lead to the accumulation of an intermediate emulsion layer. This paper presents the research of oils of four fields of the Irkutsk Oil Company: Yaraktinskoye, Ichedinskoye, Machchobinskoye, and Bolshetirskoye. The physical and chemical properties of these are given. Based on the results of the IR spectra, the spectral coefficients of oil were calculated as the ratio of the optical densities of the corresponding absorption bands of the IR spectra; the group chemical composition was analyzed and the types of oil were determined. The influence of natural emulsifiers and mechanical impurities on the stability of oil emulsions has been investigated. High concentration of mineral salts in the produced water has a significant effect on the stabilization of oil emulsions in the East Siberian petroleum province; the produced waters have low pH values. The article also indicates the composition, physical and chemical characteristics of formation waters. The microphotographs of microscopic examination of the emulsion are presented. With the help of these microphotographs it was found that the composition of the emulsion includes a crystalline phase and the size of crystals is up to 300μ. The stability of dispersed systems was evaluated using the Lumifuge 116 analyzer (L.U.M. GmbH, Germany). Based on the results of the studies, the dependence of the emulsion phase boundary position on the time was found; it also made it possible to observe the kinetics of the process in real time mode. The studies carried out in Lumifuge device are the beginning of a creation of library of passing through profiles of dispersed systems for oilfield treatment use, which will make it possible to solve the problems associated with field development quickly and efficiently.

References

1. Chertovskikh E.O., Salikhov R.M., Alternative solutions to the problem of halite and gypsum formation during oil production in Eastern Siberia (In Russ.), Inzhenernaya praktika, 2017, no. 4.

2. Syunyaev Z.I., Safieva R.Z., Syunyaev R.Z., Neftyanye dispersnye sistemy (Oil dispersed systems), Moscow: Khimiya Publ., 1990, 226 p.

3. Unger F.G., Andreeva N.G., Fundamental'nye aspekty khimii nefti. Priroda smol i asfal'tenov (Fundamental aspects of petroleum chemistry. The nature of resins and asphaltenes), Novosibirsk: Nauka Publ., 1995, 185 p.

4. Tumanyan B.P., Nauchnye i prikladnye aspekty teorii neftyanykh dispersnykh sistem (Scientific and applied aspects of the theory of oil dispersed systems), Moscow: of Tekhnika Publ., 2000, 336 p.

5. Magomedsherifov N.I., Tarasov M.Yu., Stolbov I.V., Optimization of an oil treating process at booster pump system with preliminary water discharge unit (In Russ.), Neftyanoe khozyaĭstvo = Oil Industry, 2006, no. 12, pp. 95–96.

6. Pozdnyshev G.N., Stabilizatsiya i razrushenie neftyanykh emul’siy (Stabilization and destruction of oil emulsions), Moscow: Nedra Publ., 1982, 221 p.

7. Baĭbotaeva S.E., Moldabaeva G.Zh., Nadirov K.S., Scientific and technical foundations of methods for the destruction of water-oil emulsion during oil preparation (In Russ.), Vestnik Natsional'noĭ inzhenernoĭ akademii RK, 2018, no. 1 (67), pp. 46–51.

8. Frömer D., Lerche D., An experimental approach to the study of the sedimentation of dispersed particles in a centrifugal field, Arch. Appl. Mechanics, 2002, V. 72, pp. 85–95. 

9. Sobisch T., Lerche D., Application of a new separation analyser for the characterization of dispersions stabilized with clay derivates, Colloid Polym. Sci., 2000, V. 228, pp. 369–374. 

10. Mathies E., Sobisch T., Lerche D., A new method for rapid classification of demulsifiers to separate crude oil–water emulsions, Oil and Gas Chemistry, 2002. V. 1, pp. 485–491.

11. Syunyaev Z.I., Neftyanoy uglerod (Petroleum carbon), Moscow: Khimiya Publ., 1980, 270 p.

Oil production is inevitably accompanied by the formation of oil-water emulsions, and the main task in the oil field treatment is oil-water emulsions separation. Oil emulsions significantly affect the technological processes of separation, preliminary dehydration, demulsification and lead to the accumulation of an intermediate emulsion layer. This paper presents the research of oils of four fields of the Irkutsk Oil Company: Yaraktinskoye, Ichedinskoye, Machchobinskoye, and Bolshetirskoye. The physical and chemical properties of these are given. Based on the results of the IR spectra, the spectral coefficients of oil were calculated as the ratio of the optical densities of the corresponding absorption bands of the IR spectra; the group chemical composition was analyzed and the types of oil were determined. The influence of natural emulsifiers and mechanical impurities on the stability of oil emulsions has been investigated. High concentration of mineral salts in the produced water has a significant effect on the stabilization of oil emulsions in the East Siberian petroleum province; the produced waters have low pH values. The article also indicates the composition, physical and chemical characteristics of formation waters. The microphotographs of microscopic examination of the emulsion are presented. With the help of these microphotographs it was found that the composition of the emulsion includes a crystalline phase and the size of crystals is up to 300μ. The stability of dispersed systems was evaluated using the Lumifuge 116 analyzer (L.U.M. GmbH, Germany). Based on the results of the studies, the dependence of the emulsion phase boundary position on the time was found; it also made it possible to observe the kinetics of the process in real time mode. The studies carried out in Lumifuge device are the beginning of a creation of library of passing through profiles of dispersed systems for oilfield treatment use, which will make it possible to solve the problems associated with field development quickly and efficiently.

References

1. Chertovskikh E.O., Salikhov R.M., Alternative solutions to the problem of halite and gypsum formation during oil production in Eastern Siberia (In Russ.), Inzhenernaya praktika, 2017, no. 4.

2. Syunyaev Z.I., Safieva R.Z., Syunyaev R.Z., Neftyanye dispersnye sistemy (Oil dispersed systems), Moscow: Khimiya Publ., 1990, 226 p.

3. Unger F.G., Andreeva N.G., Fundamental'nye aspekty khimii nefti. Priroda smol i asfal'tenov (Fundamental aspects of petroleum chemistry. The nature of resins and asphaltenes), Novosibirsk: Nauka Publ., 1995, 185 p.

4. Tumanyan B.P., Nauchnye i prikladnye aspekty teorii neftyanykh dispersnykh sistem (Scientific and applied aspects of the theory of oil dispersed systems), Moscow: of Tekhnika Publ., 2000, 336 p.

5. Magomedsherifov N.I., Tarasov M.Yu., Stolbov I.V., Optimization of an oil treating process at booster pump system with preliminary water discharge unit (In Russ.), Neftyanoe khozyaĭstvo = Oil Industry, 2006, no. 12, pp. 95–96.

6. Pozdnyshev G.N., Stabilizatsiya i razrushenie neftyanykh emul’siy (Stabilization and destruction of oil emulsions), Moscow: Nedra Publ., 1982, 221 p.

7. Baĭbotaeva S.E., Moldabaeva G.Zh., Nadirov K.S., Scientific and technical foundations of methods for the destruction of water-oil emulsion during oil preparation (In Russ.), Vestnik Natsional'noĭ inzhenernoĭ akademii RK, 2018, no. 1 (67), pp. 46–51.

8. Frömer D., Lerche D., An experimental approach to the study of the sedimentation of dispersed particles in a centrifugal field, Arch. Appl. Mechanics, 2002, V. 72, pp. 85–95. 

9. Sobisch T., Lerche D., Application of a new separation analyser for the characterization of dispersions stabilized with clay derivates, Colloid Polym. Sci., 2000, V. 228, pp. 369–374. 

10. Mathies E., Sobisch T., Lerche D., A new method for rapid classification of demulsifiers to separate crude oil–water emulsions, Oil and Gas Chemistry, 2002. V. 1, pp. 485–491.

11. Syunyaev Z.I., Neftyanoy uglerod (Petroleum carbon), Moscow: Khimiya Publ., 1980, 270 p.


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