Логин:
Пароль:
Регистрация
Забыли свой пароль?

Simulation of the SAGD process taking into account the threshold pressure gradient

UDK: 622.276.65
DOI: 10.24887/0028-2448-2018-8-48-51
Key words: SAGD, bitumen, super viscous oil, horizontal wells, flow rate, cumulative steam-oil ratio, steam chamber, threshold pressure gradient
Authors: R.S. Khisamov (Tatneft, RF, Almetyevsk), P.E. Morozov (IME FIC KazanSC of RAS, RF, Kazan), M.Kh. Khairullin (IME FIC KazanSC of RAS, RF, Kazan), M.N. Shamsiev (IME FIC KazanSC of RAS, RF, Kazan), A.I. Abdullin (IME FIC KazanSC of RAS, RF, Kazan)

Steam-assisted gravity drainage (SAGD) is an efficient method for super viscous oil and natural bitumen recovery. The SAGD method uses a series of pairs of injection-producing horizontal wells. The steam chambers formed above each pair of wells, reaching the top of the formation, propagate horizontally until they coalescence. As the angle of inclination of the steam chamber boundary decreases, the rate of drainage also decreases. The efficiency of a SAGD project depends strongly on bitumen-production rate, recovery factor, and cumulative steam-oil ratio (CSOR). Hence, an accurate CSOR and production rate predictions are the important task for the planning and implementation of SAGD project.

In this paper an analytical model for calculating the production rate of a horizontal well and the CSOR in the SAGD method is proposed. Verification with the results of experiments on physical models has shown that the proposed analytical model describes the SAGD process adequately. It is shown that due to non-Newtonian nature of the super viscous oils flow, the stagnant zones are formed in the inter-well space, which are not covered by the impact. The limiting angle of inclination of the steam chamber boundary at which the SAGD process terminates is obtained. The effect of the threshold pressure gradient on the horizontal well production rate and the cumulative steam oil ratio is investigated. The results of simulation showed that the threshold pressure gradient has a significant impact on the dynamics of the main indicators of the SAGD process at all stages of the steam chamber growth.

References

1. Zargar Z., Farouq Ali S.M., Analytical treatment of steam-assisted gravity drainage: old and new, SPE 185778-MS, 2017.

2. Butler R.M., Horizontal wells for the recovery of oil, gas and bitumen, Petroleum Society of CIM, Monograph no. 2, 1994.

3. Butler R.M., Thermal recovery of oil and bitumen, New Jersey: Prentice Hall, 1991, 528 p.

4. Reis J.C., A steam-assisted gravity drainage model for tar sands: linear geometry, J. Can. Pet. Tech., 1992, V. 31, no. 10, pp. 14–20.

5. Khisamov R.S., Morozov P.E., Khayrullin M.Kh. et al., The analytical model for development of heavy oil deposit by steam-assisted gravity drainage method (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2015, no. 2, pp. 62–64.

6. Mirzadzhanzade A.Kh., Voprosy gidrodinamiki vyazkoplastichnykh i vyazkikh zhidkostey v primenenii k neftedobyche (Issue of hydrodynamics of viscoplastic and viscous liquids in application to oil production), Baku: Aznefteizdat Publ., 1959, 409 p.

7. Bernadiner M.G., Entov V.M., Gidrodinamicheskaya teoriya fil'tratsii anomal'nykh zhidkostey (Hydrodynamic theory of the filtration of anomalous liquids), Moscow: Nauka Publ., 1975, 199 p.

8. Khisamov R.S., Musin M.M., Musin K.M., Obobshchenie rezul'tatov laboratornykh i opytno-promyshlennykh rabot po izvlecheniyu sverkhvyazkoy nefti iz plasta (Generalization of the results of laboratory and pilot-industrial work on the extraction of super-viscous oil from the reservoir), Kazan': Fen Publ., 2013, 232 p.

9. Miura K., Wang J., An analytical model to predict cumulative steam/oil ratio (CSOR) in thermal-recovery SAGD process, J. Can. Pet. Tech., 2012, V. 51, no. 4, pp. 268–275.

10. Chow L., Butler R.M., Numerical simulation of the steam-assisted gravity drainage process (SAGD), J. Can. Pet. Tech., 1996, V. 35, no. 6, pp. 55–62.

11.В  Shijun H., Hao X., Shaolei W. et al., Physical simulation of the interlayer effect on SAGD production in mackay river oil sands, Fuel, 2016, V. 183, no. 3, pp. 373–385.

Steam-assisted gravity drainage (SAGD) is an efficient method for super viscous oil and natural bitumen recovery. The SAGD method uses a series of pairs of injection-producing horizontal wells. The steam chambers formed above each pair of wells, reaching the top of the formation, propagate horizontally until they coalescence. As the angle of inclination of the steam chamber boundary decreases, the rate of drainage also decreases. The efficiency of a SAGD project depends strongly on bitumen-production rate, recovery factor, and cumulative steam-oil ratio (CSOR). Hence, an accurate CSOR and production rate predictions are the important task for the planning and implementation of SAGD project.

In this paper an analytical model for calculating the production rate of a horizontal well and the CSOR in the SAGD method is proposed. Verification with the results of experiments on physical models has shown that the proposed analytical model describes the SAGD process adequately. It is shown that due to non-Newtonian nature of the super viscous oils flow, the stagnant zones are formed in the inter-well space, which are not covered by the impact. The limiting angle of inclination of the steam chamber boundary at which the SAGD process terminates is obtained. The effect of the threshold pressure gradient on the horizontal well production rate and the cumulative steam oil ratio is investigated. The results of simulation showed that the threshold pressure gradient has a significant impact on the dynamics of the main indicators of the SAGD process at all stages of the steam chamber growth.

References

1. Zargar Z., Farouq Ali S.M., Analytical treatment of steam-assisted gravity drainage: old and new, SPE 185778-MS, 2017.

2. Butler R.M., Horizontal wells for the recovery of oil, gas and bitumen, Petroleum Society of CIM, Monograph no. 2, 1994.

3. Butler R.M., Thermal recovery of oil and bitumen, New Jersey: Prentice Hall, 1991, 528 p.

4. Reis J.C., A steam-assisted gravity drainage model for tar sands: linear geometry, J. Can. Pet. Tech., 1992, V. 31, no. 10, pp. 14–20.

5. Khisamov R.S., Morozov P.E., Khayrullin M.Kh. et al., The analytical model for development of heavy oil deposit by steam-assisted gravity drainage method (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2015, no. 2, pp. 62–64.

6. Mirzadzhanzade A.Kh., Voprosy gidrodinamiki vyazkoplastichnykh i vyazkikh zhidkostey v primenenii k neftedobyche (Issue of hydrodynamics of viscoplastic and viscous liquids in application to oil production), Baku: Aznefteizdat Publ., 1959, 409 p.

7. Bernadiner M.G., Entov V.M., Gidrodinamicheskaya teoriya fil'tratsii anomal'nykh zhidkostey (Hydrodynamic theory of the filtration of anomalous liquids), Moscow: Nauka Publ., 1975, 199 p.

8. Khisamov R.S., Musin M.M., Musin K.M., Obobshchenie rezul'tatov laboratornykh i opytno-promyshlennykh rabot po izvlecheniyu sverkhvyazkoy nefti iz plasta (Generalization of the results of laboratory and pilot-industrial work on the extraction of super-viscous oil from the reservoir), Kazan': Fen Publ., 2013, 232 p.

9. Miura K., Wang J., An analytical model to predict cumulative steam/oil ratio (CSOR) in thermal-recovery SAGD process, J. Can. Pet. Tech., 2012, V. 51, no. 4, pp. 268–275.

10. Chow L., Butler R.M., Numerical simulation of the steam-assisted gravity drainage process (SAGD), J. Can. Pet. Tech., 1996, V. 35, no. 6, pp. 55–62.

11.В  Shijun H., Hao X., Shaolei W. et al., Physical simulation of the interlayer effect on SAGD production in mackay river oil sands, Fuel, 2016, V. 183, no. 3, pp. 373–385.



Attention!
To buy the complete text of article (a format - PDF) or to read the material which is in open access only the authorized visitors of the website can. .

Mobile applications

Read our magazine on mobile devices

Загрузить в Google play

Press Releases

15.10.2019
08.10.2019
04.10.2019
SPE 2019