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The experience of implementation of polymer flooding technology in oil fields characterized by a high degree of salinity of reservoir and injected waters

UDK: 622.276.43:678
DOI: 10.24887/0028-2448-2019-4-74-78
Key words: polymer flooding, high salinity of water, viscoelastic polymer compositions, industrial experimental works, physical-chemical properties of polymers and their solutions, increase of oil recovery, reduction of water cuttings of well production
Authors: N.N. Mikhailov (Gubkin University, RF, Moscow; Oil and Gas Research Institute of RAS, RF, Moscow), S.T. Zakenov (Yessenov Caspian State University of Technology and Engineering, the Republic of Kazakhstan, Aktau), K.K. Kiynov (Mangistaumunaigaz JSC, the Republic of Kazakhstan, Aktau), A.V. Bondarenko (PermNIPIneft Branch of LUKOIL-Engeneering LLC in Perm, RF, Perm), L.K. Nurshakhanova (Yessenov Caspian State University of Technology and Engineering, the Republic of Kazakhstan, Aktau), Li Kai (Lomonosov Moscow State University, RF, Moscow)

The results of implementation of polymer flooding technology in oil fields characterized by high salinity of water are analyzed: Kalamkas (Kazakhstan), Moskudinskoye, Shagirtsko-Gozhanskoye (Russia, Perm Region). It has been established that application of «purely» polymer flooding with standard polyacrylamide is ineffective under these conditions, because there is almost no residual resistance factor for water injected after the slug. An additional feature of polymer flooding is the adsorption of some part of the polymer dissolved in the water by rock, and the forward part of the front of the displacing water turns out to be free of polymer, respectively, with the usual water mobility. An increase in the content of sodium chloride, calcium chloride and other electrolytes from 0,5 to 20% repeatedly increases the adsorption of the polymer on the rock. Adsorption by rocks from mineralized solutions is several times higher than from desalinated waters. With high adsorption, the front of the polymer lags far behind the front of oil displacement by water. The increase of technological efficiency can be achieved due to the combination of polymer flooding with the injection of crosslinked polymer systems, the use of which allows effectively to regulate the flooding process in heterogeneous reservoirs, as evidenced by the experience of work at the Kalamkas field. The results of polymer flooding in the Perm Region show that the technology can be effectively implemented in conditions of low and medium permeability of terrigenous reservoirs characterized by a high salinity of waters with a big content of calcium and magnesium ions due to the use of new types of polymers. As a result of the performed analysis, it is recommended to realize the following arrangement for the subsequent increase of the efficiency of polymer flooding in the Kalamkas field. Research work is required on synthesizing and adapting polymers for the geological and physical conditions for each of the development objects that provide the optimum adsorption range and efficient oil displacement.

References

1. Bondarenko A.V., Eksperimental'noe soprovozhdenie opytno-promyshlennykh rabot po obosnovaniyu tekhnologii polimernogo zavodneniya v usloviyakh vysokoy mineralizatsii plastovykh i zakachivaemykh vod (Experimental support of pilot testing on the justification of polymer flooding technology in conditions of high salinity of reservoir and injected waters): thesis of candidate of technical science, Moscow, 2017.

2. Akul'shin A.I., Prognozirovanie razrabotki neftyanykh mestorozhdeniy (Forecasting the oil fields development), Moscow: Mysl' Publ., 1988, 241 p.

3. Dorofeev V.I. et al., Okazanie nauchno-tekhnicheskoy pomoshchi pri vnedrenii tekhnologii polimernogo vozdeystviya i otsenka ee effektivnosti (Rendering scientific and technical assistance in the implementation of polymer impact technology and assessing its effectiveness), Aktau: Publ. of KazNIPIneft', 1996, 110 p.

4. Kiinov L.K., Osobennosti razrabotki mestorozhdeniy parafinistykh i vyazkikh neftey Zapadnogo Kazakhstana v usloviyakh realizatsii energosberegayushchikh tekhnologiy (Features of development of paraffinic and viscous oils deposits in Western Kazakhstan in conditions of realization of energy saving technologies), Moscow: Publ. of VNIIneft', 1994, 244 p.

5. Nadirov N.K., Vakhitov G.G., Safronov S.V. et al., Novye nefti Kazakhstana i ikh ispol'zovanie. Tekhnologiya povysheniya nefteizvlecheniya (New oil in Kazakhstan and its use. Enhanced oil recovery technology), Alma-Ata: Nauka Publ., 1982, 276 p.

6. Polishchuk A.M., Eksperimental'noe izuchenie mekhanizma vytesneniya nefti iz plasta rastvorami polimerov (Experimental study of the mechanism of oil displacement from the reservoir by polymer solutions): thesis of candidate of technical science, Moscow, 1979.

7. Bondarenko A.V., Perspektivy razvitiya tretichnykh metodov povysheniya nefteotdachi plastov na mestorozhdeniyakh Permskogo kraya (Prospects for the development of tertiary methods for enhancing oil recovery in the fields of the Perm region), Proceedings of Scientific and Practical Conference XVI “Geologiya i razrabotka mestorozhdeniy s trudnoizvlekaemymi zapasami” (Geology and development of deposits with hard-to-recover reserves), Moscow: Neftyanoe khozyaystvo Publ., 2016.

8. Bondarenko A.V., Kudryashova D.A., The application of hydrodynamic modeling for predictive effectiveness assessment of polymer flooding technology on Moskudinskoye field (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2015, no. 10, pp. 102–105.

9. Bondarenko A.V. et al., Laboratory research on justification of polymer flooding technology for specific geological conditions of oil fields’ sites development (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2016, no. 10, pp. 34–42.

10. Bondarenko A.V., Popova N.S., Geophysical and hydrodynamical researches when projecting and implementing polymer flooding technology in the oil fields of Perm region (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2016, no. 4, pp. 15–18.

11. Bondarenko A.V., Farkhutdinova P.A., Kudryashova D.A., Methods for determining the effectiveness of pilot projects on polymer flooding at the Shagirtsko-Gozhanskoye field (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 2, pp. 70–72.

12. Lyadova N.A., Raspopov A.V., Muzhikova L.N. et al., The experience of tertiary recovery methods on Perm Region reservoirs (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2015, no. 7, pp. 92–95.

13. Lyadova N.A., Raspopov A.V., Bondarenko A.V. et al., Perspective application of the polymer flooding technology in the Perm region oil deposits (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 6, pp. 94–96.

The results of implementation of polymer flooding technology in oil fields characterized by high salinity of water are analyzed: Kalamkas (Kazakhstan), Moskudinskoye, Shagirtsko-Gozhanskoye (Russia, Perm Region). It has been established that application of «purely» polymer flooding with standard polyacrylamide is ineffective under these conditions, because there is almost no residual resistance factor for water injected after the slug. An additional feature of polymer flooding is the adsorption of some part of the polymer dissolved in the water by rock, and the forward part of the front of the displacing water turns out to be free of polymer, respectively, with the usual water mobility. An increase in the content of sodium chloride, calcium chloride and other electrolytes from 0,5 to 20% repeatedly increases the adsorption of the polymer on the rock. Adsorption by rocks from mineralized solutions is several times higher than from desalinated waters. With high adsorption, the front of the polymer lags far behind the front of oil displacement by water. The increase of technological efficiency can be achieved due to the combination of polymer flooding with the injection of crosslinked polymer systems, the use of which allows effectively to regulate the flooding process in heterogeneous reservoirs, as evidenced by the experience of work at the Kalamkas field. The results of polymer flooding in the Perm Region show that the technology can be effectively implemented in conditions of low and medium permeability of terrigenous reservoirs characterized by a high salinity of waters with a big content of calcium and magnesium ions due to the use of new types of polymers. As a result of the performed analysis, it is recommended to realize the following arrangement for the subsequent increase of the efficiency of polymer flooding in the Kalamkas field. Research work is required on synthesizing and adapting polymers for the geological and physical conditions for each of the development objects that provide the optimum adsorption range and efficient oil displacement.

References

1. Bondarenko A.V., Eksperimental'noe soprovozhdenie opytno-promyshlennykh rabot po obosnovaniyu tekhnologii polimernogo zavodneniya v usloviyakh vysokoy mineralizatsii plastovykh i zakachivaemykh vod (Experimental support of pilot testing on the justification of polymer flooding technology in conditions of high salinity of reservoir and injected waters): thesis of candidate of technical science, Moscow, 2017.

2. Akul'shin A.I., Prognozirovanie razrabotki neftyanykh mestorozhdeniy (Forecasting the oil fields development), Moscow: Mysl' Publ., 1988, 241 p.

3. Dorofeev V.I. et al., Okazanie nauchno-tekhnicheskoy pomoshchi pri vnedrenii tekhnologii polimernogo vozdeystviya i otsenka ee effektivnosti (Rendering scientific and technical assistance in the implementation of polymer impact technology and assessing its effectiveness), Aktau: Publ. of KazNIPIneft', 1996, 110 p.

4. Kiinov L.K., Osobennosti razrabotki mestorozhdeniy parafinistykh i vyazkikh neftey Zapadnogo Kazakhstana v usloviyakh realizatsii energosberegayushchikh tekhnologiy (Features of development of paraffinic and viscous oils deposits in Western Kazakhstan in conditions of realization of energy saving technologies), Moscow: Publ. of VNIIneft', 1994, 244 p.

5. Nadirov N.K., Vakhitov G.G., Safronov S.V. et al., Novye nefti Kazakhstana i ikh ispol'zovanie. Tekhnologiya povysheniya nefteizvlecheniya (New oil in Kazakhstan and its use. Enhanced oil recovery technology), Alma-Ata: Nauka Publ., 1982, 276 p.

6. Polishchuk A.M., Eksperimental'noe izuchenie mekhanizma vytesneniya nefti iz plasta rastvorami polimerov (Experimental study of the mechanism of oil displacement from the reservoir by polymer solutions): thesis of candidate of technical science, Moscow, 1979.

7. Bondarenko A.V., Perspektivy razvitiya tretichnykh metodov povysheniya nefteotdachi plastov na mestorozhdeniyakh Permskogo kraya (Prospects for the development of tertiary methods for enhancing oil recovery in the fields of the Perm region), Proceedings of Scientific and Practical Conference XVI “Geologiya i razrabotka mestorozhdeniy s trudnoizvlekaemymi zapasami” (Geology and development of deposits with hard-to-recover reserves), Moscow: Neftyanoe khozyaystvo Publ., 2016.

8. Bondarenko A.V., Kudryashova D.A., The application of hydrodynamic modeling for predictive effectiveness assessment of polymer flooding technology on Moskudinskoye field (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2015, no. 10, pp. 102–105.

9. Bondarenko A.V. et al., Laboratory research on justification of polymer flooding technology for specific geological conditions of oil fields’ sites development (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2016, no. 10, pp. 34–42.

10. Bondarenko A.V., Popova N.S., Geophysical and hydrodynamical researches when projecting and implementing polymer flooding technology in the oil fields of Perm region (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2016, no. 4, pp. 15–18.

11. Bondarenko A.V., Farkhutdinova P.A., Kudryashova D.A., Methods for determining the effectiveness of pilot projects on polymer flooding at the Shagirtsko-Gozhanskoye field (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 2, pp. 70–72.

12. Lyadova N.A., Raspopov A.V., Muzhikova L.N. et al., The experience of tertiary recovery methods on Perm Region reservoirs (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2015, no. 7, pp. 92–95.

13. Lyadova N.A., Raspopov A.V., Bondarenko A.V. et al., Perspective application of the polymer flooding technology in the Perm region oil deposits (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 6, pp. 94–96.


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