«Oilfield engineering»

Fault determination at the oil field by well-test data in the presence of errors in formation parameters estimation. Part II. Presence of errors in oil viscosity estimation

UDC: 622.276.1/.4.001.57
DOI: 10.33285/0207-2351-2023-11(659)-28-35

Authors:

¹ Scientific Research Institute for System Analysis of the Russian Academy of Sciences, Moscow, Russia

Keywords: well tests, faults, fault determination, impermeable fault, partially permeable fault, faults filtration description, well test computer modeling, oil viscosity, errors in oil viscosity determination

Annotation:

Results of multi-variant numerical modeling of hydrodynamic well testing at oil field were used for investigating the possibility of fault detecting and identifying its filtration characteristics. It was supposed that drawdown curve (DC) is registered during trial production of the exploration well located near the expected fault. The abovementioned goal was achieved by the comparison of experimental DC with DC calculated for different supposed fault filtration characteristics. The pre-determined set of formation parameters was used for calculation. It was analyzed the influence of errors in oil viscosity estimation on the result of such comparison. Different methods of oil viscosity evaluation were reviewed and possible errors were estimated. It was shown that influence of errors in oil viscosity estimation on fault filtration characteristics determination is rather high. Such errors can lead to a false conclusion about fault hydroconductivity. But influence of these errors can be eliminated by using in numerical modeling the near-borehole hydroconductivity value determined from experimental DC plus special permeability normalization.

Bibliography:

1. Vyyavlenie razlomov na neftyanykh mestorozhdeniyakh po dannym gidrodinamicheskikh issledovaniy skvazhin pri nalichii pogreshnostey gidrodinamicheskogo modelirovaniya. Chast’ 1. Pogreshnosti v otsenke effektivnykh tolshchin / V.A. Yudin, S.G. Vol’pin, N.P. Efimova [i dr.] // Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy. – 2023. – № 11(383). – S. 46–55. – DOI: 10.33285/2413-5011-2023-11(383)-46-55

2. Sudo R.M. Gidrogeologiya neftyanykh mestorozhdeniy tsentral’noy chasti Zapadnoy Sibiri v estestvennykh usloviyakh i pri razrabotke: dis. … kand. geol.-miner. nauk: 25.00.07. – M., 2007. – 198 s.

3. Lesnoy A.N. Issledovanie vliyaniya diz"yunktivnykh narusheniy v yurskikh otlozheniyakh na stroenie zalezhey neftyanykh mestorozhdeniy Kogalymskogo neftegazonosnogo rayona: dis. … kand. geol.-miner. nauk: 25.00.12. – M., 2015. – 178 s.

4. Vozmozhnost’ opredeleniya fil’tratsionnykh parametrov diz"yunktivnykh narusheniy na neftyanykh mestorozhdeniyakh po dannym gidrodinamicheskikh issledovaniy plastov i skvazhin / S.G. Vol’pin, I.V. Afanaskin, V.A. Yudin, N.P. Efimova – M., 2018. – 262 s.

5. Gavrilov V.P. Geotektonika: ucheb. dlya vuzov. – M.: Izd-vo "Neft’ i gaz" RGU nefti i gaza im. I.M. Gubkina, 2005. – 368 s.

6. Metodicheskie ukazaniya po sozdaniyu postoyanno deystvuyushchikh geologo-tekhnologicheskikh modeley neftyanykh i gazoneftyanykh mestorozhdeniy. Chast’ 1. Geologicheskie modeli / A.G. Averbukh, S.I. Bilibin, D.N. Bolotnik [i dr.] – M.: OAO "VNIIOENG". – 2003. – 164 s.

7. Otsenka fil’tratsionnykh kharakteristik tektonicheskikh narusheniy na neftyanykh mestorozhdeniyakh po dannym gidrodinamicheskikh issledovaniy skvazhin / V.A. Yudin, S.G. Vol’pin, N.P. Efimova [i dr.] // Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy. – 2023. – № 1(373). – S. 65–76. – DOI: 10.33285/2413-5011-2023-1(373)-65-76

8. Chodri A. Gidrodinamicheskie issledovaniya neftyanykh skvazhin: per. s angl. – M.: OOO "Premium Inzhiniring", 2011. – 687 s.

9. Sposob opredeleniya zonal’nogo kharaktera raspredeleniya ostatochnykh neftey v razrabatyvaemom plaste / K.D. Ashmyan, S.G. Vol’pin, O.V. Kovaleva [i dr.] // Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy. – 2021. –№ 10(358). – S. 58–62. – DOI: 10.33285/2413-5011-2021-10(358)-58-62

10. OST 153-39.2-048-2003. Neft’. Tipovoe issledovanie plastovykh flyuidov i separirovannykh neftey. – M.: OAO "VNIIneft’", 2003. – 89 s.

11. Prilozhenie k Svidetel’stvu ob utverzhdenii tipa sredstv izmereniy RU.S.29.006A № 36479/1 "Ustanovki dlya issledovaniya plastovykh neftey UIPN". – URL: https://nd-gsi.ru/grsi/410xx/41553-09.pdf

12. Amerkhanov I.M., Amerkhanov I.I. Faktory, vliyayushchie na tochnost’ opredeleniya srednikh velichin parametrov nefti po zalezhi // Geologiya nefti i gaza. – 1989. – № 5. – S. 49–51.

13. O primenenii korrelyatsionnykh zavisimostey dlya opredeleniya fizicheskikh svoystv neftey belorusskikh mestorozhdeniy / I.G. Mel’nikov, V.I. Petrushenko, V.M. Tkachev, R.E. Gutman // Vestn. GGTU im. P.O. Sukhogo. – 2016. – № 1. – S. 24–29.

14. Khadavimogaddam F. Razrabotka metodiki rascheta i prognozirovaniya osnovnykh svoystv nefti s ispol’zovaniem eksperimental’nykh dannykh pri nepolnoy iskhodnoy informatsii: dis. … kand. tekhn. nauk: 25.00.17. – M., 2021. – 167 s.

15. Imamverdiyev Y.N., Hajirahimova M.Sh. Evaluation of Oil Viscosity Based Various Empirical Correlations for Azerbaijan Crude Oils // International J. of Information Technology and Computer Science. – 2019. – Vol. 11, № 6. – P. 18–27. – DOI: 10.5815/ijitcs.2019.06.03

16. Sorokin A.V., Sorokin V.D. Diapazon znacheniy fiziko-khimicheskikh svoystv prob nefti po zalezhi na mestorozhdeniyakh Zapadnoy Sibiri // Vestnik nedropol’zovatelya Khanty-Mansiyskogo avtonomnogo okruga. – 2009. – № 19. – S. 54–59.

17. STO RMNTK № 153-39.2-002-2003. Neft’. Otbor prob plastovykh flyuidov. – M.: OAO "VNIIneft’", 2003. – 30 s.