Changes in composition and properties of crude oil resulting from application of enhanced oil recovery technologies

UDK: 622.276.6 + 665.61.03
DOI: 10.24887/0028-2448-2017-9-100-103
Key words: enhanced oil recovery (EOR), geochemical survey, composition and properties of crude oil
Authors: А.А. Nafikov (Tatneft PJSC, RF, Almetyevsk), М.R. Khisametdinov, А.V. Fedorov (TatNIPIneft, RF, Bugulma), T.N. Yusupova, Е.Е. Barskaya, Yu.М. Ganeeva (Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center of RAS, RF, Kazan)

Chemical methods of enhanced oil recovery (EOR) efficiency is associated with improved displacement of oil with original or slightly altered properties from unswept reservoir zones, and better displacement of mobile residual oil with high content of resin and asphaltene components from flushed zones. Studies on the effects of various production stimulation technologies remain important. The results of field-scale research provide the most valuable data necessary for feasibility studies and development of innovative technologies as well as for improvement of existing improved (IOR) and enhanced oil recovery methods.

The paper presents the results of comparative analysis of the composition and properties of crude oil samples collected before and after stimulation with the aim to improve sweep efficiency and oil recovery. To analyze oil composition, a number of physical and chemical methods were used including thermoanalysis, gas-liquid chromatography, gas-solid chromatography, infrared spectroscopy. It has been found that stimulation treatments promote oil displacement from unswept reservoir intervals containing oil with original or slightly altered properties. Injection of alkaline-polymer systems resulted in reduction of oil viscosity and asphaltene content while the content of middle distillates and light hydrocarbons increased. Similar changes were observed after application of integrated stimulation technology that consists in gel treatments followed by acid injection.

The results suggest that the applied technologies improve oil displacement from reservoir intervals and zones containing low-viscosity oil. These findings have been confirmed by well logging data. Chemical floods result in decrease of asphaltene content, increase of middle distillates and light hydrocarbons in produced oil, and overall mobilization of residual oil. Monitoring of composition and properties of produced oil makes it possible to understand the mechanisms of chemical EOR and confirms efficiency of chemical flooding.

References

1. Sabakhova G.I., Rafikova K.R., Khisametdinov M.R., Nuriev D.V., Zaripov A.T., Foreign experience in the application of enhanced oil recovery methods (In Russ.), Neft'. Gaz. Novatsii, 2015, no. 4, pp. 25-30.

2. Yusupova T.N., Romanov A.G., Barskaya E.E., Ganeeva Yu.M., Evaluation of the effects of encapsulated polymer systems on the formation using the changes in the composition of produced oil (In Russ.), Elektronnyy nauchnyy zhurnal Neftegazovoe delo, 2007, URL: http://www.ogbus.ru/ authors/ Yusupova/Yusupova_1.pdf

3. Yusupova T.N., Petrova L.M., Ganeeva Yu.M. et al., Use of thermal analysis in identification of tatarstan crude oils (In Russ.), Neftekhimiya = Petroleum Chemistry, 1999, V. 39, no. 4, pp. 254–259.

4. Aspekty geneticheskikh svyazey neftey i organicheskogo veshchestva porod (Aspects of the genetic relationships of oils and organic matter of rocks): edited by Eremenko N.A., Maksimov S.P., Moscow: Nauka Publ., 1986, 134 p.

5. Sovremennye metody analiza v organicheskoy geokhimii (Modern methods of analysis in organic geochemistry): edited by Kontorovicha A.E., Novosibirsk: Publ. of SNIIGGiMS, 1973, 100 p.

6. Rybak B.M., Analiz nefti i nefteproduktov (Analysis of oil and oil products), Moscow: Gostoptekhizdat Publ., 1962, 888 p.

7. Yusupova T.N., Barskaya E.E., Ganeeva Yu.M., Romanov A.G., Development of methodology for producing fields crude oil typing (In Russ.), Tekhnologii nefti i gaza, 2010, no. 1, pp. 46–53.

8. Yusupova T.N., Ganeeva Yu.M., Romanov G.V., Barskaya E.E., Fiziko-khimicheskie protsessy v produktivnykh neftyanykh plastakh (Physical and chemical processes in the productive oil reservoirs), Moscow: Nauka Publ., 2015, 412 p.

Chemical methods of enhanced oil recovery (EOR) efficiency is associated with improved displacement of oil with original or slightly altered properties from unswept reservoir zones, and better displacement of mobile residual oil with high content of resin and asphaltene components from flushed zones. Studies on the effects of various production stimulation technologies remain important. The results of field-scale research provide the most valuable data necessary for feasibility studies and development of innovative technologies as well as for improvement of existing improved (IOR) and enhanced oil recovery methods.

The paper presents the results of comparative analysis of the composition and properties of crude oil samples collected before and after stimulation with the aim to improve sweep efficiency and oil recovery. To analyze oil composition, a number of physical and chemical methods were used including thermoanalysis, gas-liquid chromatography, gas-solid chromatography, infrared spectroscopy. It has been found that stimulation treatments promote oil displacement from unswept reservoir intervals containing oil with original or slightly altered properties. Injection of alkaline-polymer systems resulted in reduction of oil viscosity and asphaltene content while the content of middle distillates and light hydrocarbons increased. Similar changes were observed after application of integrated stimulation technology that consists in gel treatments followed by acid injection.

The results suggest that the applied technologies improve oil displacement from reservoir intervals and zones containing low-viscosity oil. These findings have been confirmed by well logging data. Chemical floods result in decrease of asphaltene content, increase of middle distillates and light hydrocarbons in produced oil, and overall mobilization of residual oil. Monitoring of composition and properties of produced oil makes it possible to understand the mechanisms of chemical EOR and confirms efficiency of chemical flooding.

References

1. Sabakhova G.I., Rafikova K.R., Khisametdinov M.R., Nuriev D.V., Zaripov A.T., Foreign experience in the application of enhanced oil recovery methods (In Russ.), Neft'. Gaz. Novatsii, 2015, no. 4, pp. 25-30.

2. Yusupova T.N., Romanov A.G., Barskaya E.E., Ganeeva Yu.M., Evaluation of the effects of encapsulated polymer systems on the formation using the changes in the composition of produced oil (In Russ.), Elektronnyy nauchnyy zhurnal Neftegazovoe delo, 2007, URL: http://www.ogbus.ru/ authors/ Yusupova/Yusupova_1.pdf

3. Yusupova T.N., Petrova L.M., Ganeeva Yu.M. et al., Use of thermal analysis in identification of tatarstan crude oils (In Russ.), Neftekhimiya = Petroleum Chemistry, 1999, V. 39, no. 4, pp. 254–259.

4. Aspekty geneticheskikh svyazey neftey i organicheskogo veshchestva porod (Aspects of the genetic relationships of oils and organic matter of rocks): edited by Eremenko N.A., Maksimov S.P., Moscow: Nauka Publ., 1986, 134 p.

5. Sovremennye metody analiza v organicheskoy geokhimii (Modern methods of analysis in organic geochemistry): edited by Kontorovicha A.E., Novosibirsk: Publ. of SNIIGGiMS, 1973, 100 p.

6. Rybak B.M., Analiz nefti i nefteproduktov (Analysis of oil and oil products), Moscow: Gostoptekhizdat Publ., 1962, 888 p.

7. Yusupova T.N., Barskaya E.E., Ganeeva Yu.M., Romanov A.G., Development of methodology for producing fields crude oil typing (In Russ.), Tekhnologii nefti i gaza, 2010, no. 1, pp. 46–53.

8. Yusupova T.N., Ganeeva Yu.M., Romanov G.V., Barskaya E.E., Fiziko-khimicheskie protsessy v produktivnykh neftyanykh plastakh (Physical and chemical processes in the productive oil reservoirs), Moscow: Nauka Publ., 2015, 412 p.


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