«Oilfield engineering»

Application of spirits and surfactants in well killing technologies in the low-permeable Jurassic reservoirs of the Kharampur group of fields

UDC: 622.276.6
DOI: -

Authors:

¹ RN-Geology Research Development, Tyumen, Russia
² Kharampurneftegaz, Tyumen, Russia

Keywords: well killing, Jurassic reservoirs, water saturation, bottomhole formation zone, water absorber, surfactant, water plugging

Annotation:

The use of conventional killing fluids in low-permeable Jurassic reservoirs leads to the formation of a man-induced zone of higher water saturation in production wells, blocking the oil flow due to saturation of the pore space by water and a decrease of phase permeability. The oil inflow can be restored and increased by using water-absorbing agents, surface-active agents (surfactants), and agents which change the wettability of the pore space. The introduction of spirit solutions and surfactants into process fluids reduces the interfacial tension of the solution at the oil-rock interface, helps to remove water saturating the formation and to destroy micro-emulsions in the bottomhole zone, ensuring a more complete removal of the killing fluid from the formation. For low-permeable Jurassic reservoirs, various concentrations of water-spirit and surfactant solutions were tested to select the optimal dosage and assess their effect on the rock water saturation and oil relative permeability. Laboratory tests were conducted on oil-saturated cores from low-permeable Jurassic reservoirs of the Kharampur group of fields. The experiments confirmed an increase of the oil permeability recovery factor and a decrease of the amount of water absorbed by the rock when introducing multicomponent surfactants into water-based fluids. It is noted that in order to maintain oil mobility in a low-permeable reservoir, the surfactant concentration in the fluid should be above the CCM point. According to laboratory data, the greatest effect of reducing the water saturation of cores is achieved when injecting water-spirit solutions. When exposed to a spirit solution with added surfactant, a synergistic effect of the simultaneous presence of spirit and surfactant in water-based fluid is manifested. As a result of applying killing fluids with an increased surfactant dosage into production wells in field conditions, the high performance of the proposed technological solutions is shown, which is manifested by maintaining oil rates and wells productivity after repair as well as reducing the duration of rate stabilization period.

Bibliography:

1. Analiz sovremennykh tekhniko-tekhnologicheskikh resheniy pri glushenii i promyvke skvazhin / S.A. Shadymukhamedov, Yu.V. Smykov, T.M. Fakhitov, R.M. Safuanov // Elektronnyy nauchnyy zhurnal "Issledovano v Rossii". – 2008. – S. 724–736.

2. Glushchenko V.N., Silin M.A. Neftepromyslovaya khimiya. T. 3. Prizaboynaya zona plasta i tekhnogennye faktory ee sostoyaniya. – M.: Interkontakt Nauka, 2010. – 650 s.

3. Tekhnologii glusheniya skvazhin v usloviyakh mnozhestvennykh rabot / V.N. Gusakov, A.Yu. Korolev, R.A. Yagudin [i dr.] // Neftegazovoe delo. – 2023. – T. 21, № 2. – S. 17–24.

4. Problemy glusheniya skvazhin Priobskogo mestorozhdeniya i puti ikh resheniya / S.E. Zdol’nik, I.M. Zgoba, A.G. Telin, V.N. Gusakov // Nauchno-tekhnicheskiy vestnik OAO "NK "Rosneft’". – 2006. – № 1. – S. 35–37.

5. Rezul’taty ispol’zovaniya inertnykh solevykh rastvorov pri glushenii skvazhin na neftyanykh mestorozhdeniyakh Zapadnoy Sibiri / A.V. Chernyshev, V.V. Mazaev, D.B. Krivosheev, S.P. Khlebnikov // Neftyanoe khozyaystvo. – 2005. – № 8. – S. 90–93.

6. Issledovanie vosstanovleniya pronitsaemosti modeli produktivnogo plasta neftyanykh mestorozhdeniy posle vozdeystviya zhidkosti glusheniya / A.V. Pesterev, D.N. Mezentsev, E.V. Tupitsin, V.V. Evseev // Neftepromyslovoe delo. – 2016. – № 10. – S. 47–52.

7. Novye tekhnologii OAO "OTO" v oblasti intensifikatsii dobychi nefti / K.V. Strizhnev, E.A. Rumyantseva, N.I. Akimov, M.V. Lapshina // Interval. – 2005. – № 4-5. – S. 58–63.

8. Peredovye tekhnologii glusheniya skvazhin / M.A. Silin, L.A. Magadova, O.V. Akimov [i dr.] // Neftyanoe khozyaystvo. – 2015. – № 1. – S. 66–70.

9. Fundamentals of wettability / W. Abdallah, J.S. Buckey, A. Carnegie [et al.] // Schlumberger Oilfild Review. – Amsterdam: Elsevier, 2007. – Vol. 19, № 2. – P. 44–61.

10. Demakhin S.A., Demakhin A.G., Gubanov V.B. Izuchenie vliyaniya gidrofobiziruyushchikh sostavov na vodonasyshchennost’ i pronitsaemost’ prizaboynoy zony neftyanogo plasta // Neftepromyslovoe delo. – 2009. – № 6. – S. 25–28.

11. O netselesoobraznosti gidrofobizatsii prizaboynoy zony skvazhin / V.N. Sergienko, N.A. Cherepanova, E.F. Kutyrev, G.V. Lozhkin // Neftyanoe khozyaystvo. – 2006. – № 11. – S. 34–37.

12. Issledovanie poverkhnostno-aktivnykh veshchestv (PAV) razlichnogo tipa, primenyaemykh v sostave tekhnologicheskikh zhidkostey / M.A. Silin, L.A. Magadova, E.G. Gaevoy [i dr.] // Territoriya Neftegaz. – 2011. – № 8. – S. 50–55.