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Decrease of permeability in terrigenous productive deposits while formation drilling-in in the Eastern Siberia

UDK: 622.244.442.063:543
DOI: 10.24887/0028-2448-2019-6-33-37
Key words: drilling fluids, Eastern Siberia, mineralization, formation exposing, permeability, productivity
Authors: R.R. Akhmetzyanov (Tyumen Branch of SurgutNIPIneft, Surgutneftegas PJSC, RF, Tyumen)

Insufficient development of formation exposing technology in the Eastern Siberia may be reasoned by the problem of identifying primary and secondary reasons why formation permeability value decreases. Besides, region seems perspective considering presence of oil transport system, developing deposits with significant recoverable reserves and requires more accurate expert control. In attempt to specify the reasons of permeability decrease while formation exposing, it is necessary to observe geological-and-physical characteristics of terrigenous formations of Nepa-Botuoba oil-and-gas bearing region, especially B10 formation which is the most prevalent over estimated region, amongst most common factors. B10 formation is characterized by complex structure and development of lithological, stratigraphic and tectonic factors in various degrees. The post-sedimentation strata transformation processes associated with secondary cementation caused major effect on reservoir spreading. Sandstone salinization was one of them. In addition, several responsible for reservoir characteristics lithotypes are distinguished in the formation. Reservoir characteristics of B10 formation are variable, depending on geological profile and deposit location. High value of formation water mineralization and halite presence could be referred to the main reasons of permeability decrease. Low-mineralized drilling fluids based on sodium chloride solution and their filtrate could quickly penetrate productive layer in high volume, bypassing the largest pore throats, usual for the first lithotype. Negative effect of such fluids on the high-permeable layers is low. However, it could decrease permeability of adjoined productive layers. Such layers are composed with aleurolite and silt sandstone, including sulphate and carbonate formations. Considering interrelation between formation exposing result, various lithological and petrophysical properties and formation fluids saturation, it is necessary to prevent infiltration of drilling mud and its filtrate to reservoir formation at the significant depth while maintaining water-based mud.

References

1. Fuks B.A., Kazanskiy V.V., Moskalets G.N. et al., Vskrytie produktivnykh plastov i ispytanie skvazhin v usloviyakh zasolonennogo razreza (Sompletion and well testing in conditions of salinization), Moscow: Nedra Publ., 1978, 127 p.

2. Nikolaeva L.V., Vasenyova E.G., Buglov E.N., Features of drilling in production horizons at oil fields in Eastern Siberia (In Russ.), Vestnik IrGTU, 2012, no. 9, pp. 68–71.

3. Levanov A., Ignat'ev N., Ostyakov E. et al., Challenges in the development of saline terrigenous reservoirs of Eastern Siberia field (In Russ.), SPE 191570-18RPTC-RU, 2018, https://doi.org/10.2118/191570-18RPTC-RU.

4. Strakhov P.N., Koloskov V.N., Bogdanov O.A. et al., Development of hydrocarbon reserves dedicated to the reserve rocks with a complex structure (In Russ.), Vestnik Assotsiatsii burovykh podryadchikov, 2017, no. 3, pp. 39–43.

5. Akhmetzyanov R.R., Zhernakov V.N., Improving the drilling fluid composition for drilling-in terrigenous deposits of Eastern Siberia (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2017, no. 8, pp. 80–82.

6. Safronov A.F., Zones of oil and gas accumulation in the north-east of the Nepsko-Botuobinsky anteclise (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2006, no. 7, pp. 18–27.

7. Vorob'ev V.N., Moiseev S.A., Topeshko V.A., Sitnikov V.S., Oil and gas fields in the central part of the Nepsko-Botuobinsky anteclise (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2006, no. 7, pp. 4–17.

8. Vorob'ev V.S., Zhukovskaya E.A., Mukhidinov Sh.V., Consideration of the salinization effect of reservoir rocks layers B10, B13 of the Nepa Formation in order to improve the exploration drilling efficiency at the Ignyalinskiy, Tympuchikanskiy and Vakunayskiy license areas (Eastern Siberia) (In Russ.), Geologiya nefti i gaza, 2017, no. 6, pp. 49–57.

9. Polyakov E.E., Pylev E.A., Churikova I.V. et al., Productivity of complex terrigenous reservoirs of the Vendian of the Chayandinskoe field depending on the lithological and petrophysical properties and geological and technical conditions of the opencut of sediments (In Russ.), Territoriya Neftegaz, 2017, no. 12, pp. 22–32.

10. Andreeva O.V., Novoselov D.V., Method of determining the content of abnormal rock-forming minerals (In Russ.), Izvestiya vuzov. Neft' i gaz, 2011, no. 2, pp. 45–49.

11. Belyakov M.A., Danilko N.K., Kosterina V.A., Sokolov D.I., The experience of studying the riphean-vendian clastic reservoirs of eastern Siberian on core and log data (In Russ.), Geofizika, 2013, no. 4, pp. 22–28.

12. Sokolova O.V., Sostav porodoobrazuyushchego kompleksa vend-nizhnekembriyskikh otlozheniy Sibirskoy platformy po dannym IK-spektrometrii (The composition of the rock-forming complex of the Vendian-Lower Cambrian sediments of the Siberian platform according to IR spectrometry), Proceedings of SurgutNIPIneft', 2006, V. 7, pp. 64–72.

13. Safronov A.F., Chalaya O.N., On the nature of the high salinity of oil from the Talakan field (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2006, no. 7, pp. 35–37.

14. Vozhov V.I., Chernova L.S., Secondary mineral formation in the Vendian-Lower Cambrian sediments of the Nepsko-Botuobinsky anteclise (In Russ.), Geologiya nefti i gaza, 1999, no. 11–12, pp. 41–48.

15. Abramov D.A., Abramov A.S., Malyshev A.G., Hydrates formation at modeling of conditions of oil displacement by consecutive fringes of water and gas (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2006, no. 5, pp. 88–90.

16. Betekhtin A.G., Kurs mineralogii (Mineralogy course), Moscow: KDU Publ., 2007, 721 p.

Insufficient development of formation exposing technology in the Eastern Siberia may be reasoned by the problem of identifying primary and secondary reasons why formation permeability value decreases. Besides, region seems perspective considering presence of oil transport system, developing deposits with significant recoverable reserves and requires more accurate expert control. In attempt to specify the reasons of permeability decrease while formation exposing, it is necessary to observe geological-and-physical characteristics of terrigenous formations of Nepa-Botuoba oil-and-gas bearing region, especially B10 formation which is the most prevalent over estimated region, amongst most common factors. B10 formation is characterized by complex structure and development of lithological, stratigraphic and tectonic factors in various degrees. The post-sedimentation strata transformation processes associated with secondary cementation caused major effect on reservoir spreading. Sandstone salinization was one of them. In addition, several responsible for reservoir characteristics lithotypes are distinguished in the formation. Reservoir characteristics of B10 formation are variable, depending on geological profile and deposit location. High value of formation water mineralization and halite presence could be referred to the main reasons of permeability decrease. Low-mineralized drilling fluids based on sodium chloride solution and their filtrate could quickly penetrate productive layer in high volume, bypassing the largest pore throats, usual for the first lithotype. Negative effect of such fluids on the high-permeable layers is low. However, it could decrease permeability of adjoined productive layers. Such layers are composed with aleurolite and silt sandstone, including sulphate and carbonate formations. Considering interrelation between formation exposing result, various lithological and petrophysical properties and formation fluids saturation, it is necessary to prevent infiltration of drilling mud and its filtrate to reservoir formation at the significant depth while maintaining water-based mud.

References

1. Fuks B.A., Kazanskiy V.V., Moskalets G.N. et al., Vskrytie produktivnykh plastov i ispytanie skvazhin v usloviyakh zasolonennogo razreza (Sompletion and well testing in conditions of salinization), Moscow: Nedra Publ., 1978, 127 p.

2. Nikolaeva L.V., Vasenyova E.G., Buglov E.N., Features of drilling in production horizons at oil fields in Eastern Siberia (In Russ.), Vestnik IrGTU, 2012, no. 9, pp. 68–71.

3. Levanov A., Ignat'ev N., Ostyakov E. et al., Challenges in the development of saline terrigenous reservoirs of Eastern Siberia field (In Russ.), SPE 191570-18RPTC-RU, 2018, https://doi.org/10.2118/191570-18RPTC-RU.

4. Strakhov P.N., Koloskov V.N., Bogdanov O.A. et al., Development of hydrocarbon reserves dedicated to the reserve rocks with a complex structure (In Russ.), Vestnik Assotsiatsii burovykh podryadchikov, 2017, no. 3, pp. 39–43.

5. Akhmetzyanov R.R., Zhernakov V.N., Improving the drilling fluid composition for drilling-in terrigenous deposits of Eastern Siberia (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2017, no. 8, pp. 80–82.

6. Safronov A.F., Zones of oil and gas accumulation in the north-east of the Nepsko-Botuobinsky anteclise (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2006, no. 7, pp. 18–27.

7. Vorob'ev V.N., Moiseev S.A., Topeshko V.A., Sitnikov V.S., Oil and gas fields in the central part of the Nepsko-Botuobinsky anteclise (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2006, no. 7, pp. 4–17.

8. Vorob'ev V.S., Zhukovskaya E.A., Mukhidinov Sh.V., Consideration of the salinization effect of reservoir rocks layers B10, B13 of the Nepa Formation in order to improve the exploration drilling efficiency at the Ignyalinskiy, Tympuchikanskiy and Vakunayskiy license areas (Eastern Siberia) (In Russ.), Geologiya nefti i gaza, 2017, no. 6, pp. 49–57.

9. Polyakov E.E., Pylev E.A., Churikova I.V. et al., Productivity of complex terrigenous reservoirs of the Vendian of the Chayandinskoe field depending on the lithological and petrophysical properties and geological and technical conditions of the opencut of sediments (In Russ.), Territoriya Neftegaz, 2017, no. 12, pp. 22–32.

10. Andreeva O.V., Novoselov D.V., Method of determining the content of abnormal rock-forming minerals (In Russ.), Izvestiya vuzov. Neft' i gaz, 2011, no. 2, pp. 45–49.

11. Belyakov M.A., Danilko N.K., Kosterina V.A., Sokolov D.I., The experience of studying the riphean-vendian clastic reservoirs of eastern Siberian on core and log data (In Russ.), Geofizika, 2013, no. 4, pp. 22–28.

12. Sokolova O.V., Sostav porodoobrazuyushchego kompleksa vend-nizhnekembriyskikh otlozheniy Sibirskoy platformy po dannym IK-spektrometrii (The composition of the rock-forming complex of the Vendian-Lower Cambrian sediments of the Siberian platform according to IR spectrometry), Proceedings of SurgutNIPIneft', 2006, V. 7, pp. 64–72.

13. Safronov A.F., Chalaya O.N., On the nature of the high salinity of oil from the Talakan field (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2006, no. 7, pp. 35–37.

14. Vozhov V.I., Chernova L.S., Secondary mineral formation in the Vendian-Lower Cambrian sediments of the Nepsko-Botuobinsky anteclise (In Russ.), Geologiya nefti i gaza, 1999, no. 11–12, pp. 41–48.

15. Abramov D.A., Abramov A.S., Malyshev A.G., Hydrates formation at modeling of conditions of oil displacement by consecutive fringes of water and gas (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2006, no. 5, pp. 88–90.

16. Betekhtin A.G., Kurs mineralogii (Mineralogy course), Moscow: KDU Publ., 2007, 721 p.



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