The collection of factors affecting the efficiency of low-permeable reservoirs development using flooding

UDK: 622.276.1/.4.553.98Н.П.
DOI: 10.24887/0028-2448-2020-12-106-109
Key words: displacement efficiency, reservoir pressure maintenance system intensity, watering of wells, low-permeability reservoirs, growth of man-made cracks due to the injection of untreated water, stress-strain state of the reservoir
Authors: A.A. Izotov (Tyumen Petroleum Research Center LLC, RF, Tyumen), D.G. Afonin (Tyumen Petroleum Research Center LLC, RF, Tyumen)

The general downward trend in oil production requires a constant increase in recoverable reserves. Most of the currently developing deposits have low reservoir properties and are characterized by a relatively low final oil recovery. Nowadays economic factors play a decisive role in the design of the development of such deposits. The implemented development system is selected in the first technological document, which, due to the lack of initial knowledge of the reservoir, is characterized by an optimistic idea of the reserves quality. With the input of the field into commercial development, the active implementation of the adopted design solutions is realized with the maximum possible rate of reserves development.

Waterflooding, especially for low-permeability objects, is often implemented under conditions of insufficiently expedient in relation to production intensity of the pressure maintenance system. This is reflected in the optimization of the number of injection wells, a less intensive option for their completion, which is compensated by an increase in the injection pressure; rapid flooding of production wells. The authors have identified and shown the relationship of factors affecting the dynamics and rate of watering of wells in low-permeability reservoirs. It is shown that even in the presence of mobile reserves in the drainage area the formation of through man-made cracks multiplies the recovery time reserves and reduces the intensity of displacement.

References

1. Zakirov S.N., Zakirov E.S., Zakirov I.S. et al., Novye printsipy i tekhnologii razrabotki mestorozhdeniy nefti i gaza (The new principles and technologies of oil and gas fields development), Moscow: Nedra Publ., 2004, 520 p. 

2. Afanas'eva A.V., Gorbunov A.T., Shustef I.N., Zavodnenie neftyanykh mestorozhdeniy pri vysokikh davleniyakh nagnetaniya (Waterflooding of oil fields at high injection pressures), Moscow: Nedra Publ., 1975, 216 p.

3. Mal'tsev V.V., Asmandiyarov R.N., Baykov V.A. et al., Testing of auto hydraulic-fracturing growth of the linear oilfield development system of Priobskoye oil field (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2012, no. 5, pp. 70-73.

4.  Gavura V.E., Geologiya i razrabotka neftyanykh i gazoneftyanykh mestorozhdeniy (Geology and development of oil and oil-and-gas fields), Moscow: Publ. of VNIIOENG, 1995, 496 p.

5. Klyachko V.A., Apel'tsin I.E., Ochistka prirodnykh vod (Purification of natural waters), Moscow: Stroyizdat Publ., 1971, 579 p.

6. Chepkasova E.V., Ivanov M.G., Technological efficiency evaluation applying water like as displacement agent in low permeable formation (In Russ.), Territoriya neftegaz, 2016, no. 2, pp. 82-86.

7. Nazarov V.D. et al., Preparation of produced water for pressure maintenance system in low permeable oil reservoir (In Russ.), Neftegazovoe delo, 2017, no. 6, URL: http://ogbus.ru/files/ogbus/issues/6_2017/ogbus_6_2017_p35-56_NazarovVD_ru.pdf

8. Kuznetsov V.S., Dependence of injectivity of injection wells on the quality of water injected into oil reservoirs (In Russ.), Neftepromyslovoe delo, 1978, no. 8.

9. Neyman Yu.I., Landa P.S., Statisticheskie i khaoticheskie kolebaniya (Statistical and chaotic fluctuations), Moscow: Nauka Publ., 1987, 424 p.

10. Zaynetdinov T.I. et al., On the deterministic nature of permeability fluctuations during filtration of heterogeneous systems (In Russ.), Neftepromyslovoe delo, 1999, no. 3.

11. Khasanov M.M. et al.,  Technical and economical evaluation of waterflood patterns formed by hydraulically fractured wells (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2009, no. 2, pp. 92–96.

12. Kuzmina S.S., Butula K.K., Reservoir pressure depletion and water flooding influencing hydraulic fracture orientation in low permeability oilfields, SPE-120749-MS, 2009.

13.  Baykov V.A., Davletbaev A.Ya., Usmanov T.S., Stepanova Z.Yu., Special well tests to fractured water injection wells (In Russ.), Neftegazovoe delo, 2011, no. 1, pp. 65–75, URL: http://ogbus.ru/files/ogbus/authors/Baikov/Baikov_1.pdf

The general downward trend in oil production requires a constant increase in recoverable reserves. Most of the currently developing deposits have low reservoir properties and are characterized by a relatively low final oil recovery. Nowadays economic factors play a decisive role in the design of the development of such deposits. The implemented development system is selected in the first technological document, which, due to the lack of initial knowledge of the reservoir, is characterized by an optimistic idea of the reserves quality. With the input of the field into commercial development, the active implementation of the adopted design solutions is realized with the maximum possible rate of reserves development.

Waterflooding, especially for low-permeability objects, is often implemented under conditions of insufficiently expedient in relation to production intensity of the pressure maintenance system. This is reflected in the optimization of the number of injection wells, a less intensive option for their completion, which is compensated by an increase in the injection pressure; rapid flooding of production wells. The authors have identified and shown the relationship of factors affecting the dynamics and rate of watering of wells in low-permeability reservoirs. It is shown that even in the presence of mobile reserves in the drainage area the formation of through man-made cracks multiplies the recovery time reserves and reduces the intensity of displacement.

References

1. Zakirov S.N., Zakirov E.S., Zakirov I.S. et al., Novye printsipy i tekhnologii razrabotki mestorozhdeniy nefti i gaza (The new principles and technologies of oil and gas fields development), Moscow: Nedra Publ., 2004, 520 p. 

2. Afanas'eva A.V., Gorbunov A.T., Shustef I.N., Zavodnenie neftyanykh mestorozhdeniy pri vysokikh davleniyakh nagnetaniya (Waterflooding of oil fields at high injection pressures), Moscow: Nedra Publ., 1975, 216 p.

3. Mal'tsev V.V., Asmandiyarov R.N., Baykov V.A. et al., Testing of auto hydraulic-fracturing growth of the linear oilfield development system of Priobskoye oil field (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2012, no. 5, pp. 70-73.

4.  Gavura V.E., Geologiya i razrabotka neftyanykh i gazoneftyanykh mestorozhdeniy (Geology and development of oil and oil-and-gas fields), Moscow: Publ. of VNIIOENG, 1995, 496 p.

5. Klyachko V.A., Apel'tsin I.E., Ochistka prirodnykh vod (Purification of natural waters), Moscow: Stroyizdat Publ., 1971, 579 p.

6. Chepkasova E.V., Ivanov M.G., Technological efficiency evaluation applying water like as displacement agent in low permeable formation (In Russ.), Territoriya neftegaz, 2016, no. 2, pp. 82-86.

7. Nazarov V.D. et al., Preparation of produced water for pressure maintenance system in low permeable oil reservoir (In Russ.), Neftegazovoe delo, 2017, no. 6, URL: http://ogbus.ru/files/ogbus/issues/6_2017/ogbus_6_2017_p35-56_NazarovVD_ru.pdf

8. Kuznetsov V.S., Dependence of injectivity of injection wells on the quality of water injected into oil reservoirs (In Russ.), Neftepromyslovoe delo, 1978, no. 8.

9. Neyman Yu.I., Landa P.S., Statisticheskie i khaoticheskie kolebaniya (Statistical and chaotic fluctuations), Moscow: Nauka Publ., 1987, 424 p.

10. Zaynetdinov T.I. et al., On the deterministic nature of permeability fluctuations during filtration of heterogeneous systems (In Russ.), Neftepromyslovoe delo, 1999, no. 3.

11. Khasanov M.M. et al.,  Technical and economical evaluation of waterflood patterns formed by hydraulically fractured wells (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2009, no. 2, pp. 92–96.

12. Kuzmina S.S., Butula K.K., Reservoir pressure depletion and water flooding influencing hydraulic fracture orientation in low permeability oilfields, SPE-120749-MS, 2009.

13.  Baykov V.A., Davletbaev A.Ya., Usmanov T.S., Stepanova Z.Yu., Special well tests to fractured water injection wells (In Russ.), Neftegazovoe delo, 2011, no. 1, pp. 65–75, URL: http://ogbus.ru/files/ogbus/authors/Baikov/Baikov_1.pdf



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