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Estimated and actual production rates of horizontal wells

Authors: S.N. Zakirov (Oil and Gas Research Institute of RAS, RF, Moscow), D.K. Shaikhutdinov (TatNIPIneft, RF, Bugulma)

Key words: Dupuis formula, skin-factor, absolute permeability, production rate, formation volume factor, horizontal well.

This paper discusses the reasons for discrepancy between production rates of horizontal wells calculated by analytic formulas and actual well rates from the Romashkino field. It has been found that analytical formulas derived on the basis of total pore volume concept based on absolute gas permeabilities do not consider formation volume and skin factors. Randomly assumed dimensions of a specific drainage volume model affect simulated results. Besides, analytic formulas do not consider reservoir heterogeneity and transient fluid flow observed after putting a well on stream. Therefore, such formulas should be used mainly for qualitative evaluation. The authors recommend using 3D sector or full-field reservoir models to predict horizontal well rates.
References
1. Grigoryan A.M., Vskrytie plastov mnogozaboynymi i gorizontal'nymi
skvazhinami (Drilling-in using horizontal and multilateral wells), Moscow:
Nedra Publ., 1969, 190 p.
2. Charnyy I.A., Podzemnaya gidromekhanika (The Underground hydromechanics), Moscow: Gostoptekhizdat Publ., 1948, 196 p.
3. Polubarinova-Kochina P.Ya., About directional and horizontal wells of finite length (In Russ.), Prikladnaya matematika i mekhanika, 1956, V. 20, no. 6, pp. 95–108.
4. Tabakov V.P., Determination of flow rate and the effectiveness of multilateral wells in layered reservoir (In Russ.), Proceedings of VNII, Moscow: Gostoptekhizdat Publ., 1960, V. 10, pp. 47–50.
5. Borisov Yu.P., Pilatovskiy V.P., Tabakov V.P., Razrabotka neftyanykh
mestorozhdeniy gorizontal'nymi i mnogozaboynymi skvazhinami (Development of oil fields using horizontal and multilateral wells), Moscow: Nedra Publ., 1964, 154 p.
6. Bady W.J., Odeh A.S., Productivity of horizontal well, SPERE, 1989, Nov.,
pp. 417–421.
7. Besson J., Performance of slanted and horizontal wells on an anisotropic
medium, Paper presented at European Petroleum Conference, 21-24 October,
The Hague, Netherlands, Oct. 22-24, 1990 (SPE-20965-MS).
8. Joshi S.D., Horizontal well technology, Tulsa, PennWell Books, 1991, 533 p.
9. Khakimzyanov I.N., Teoriya i praktika razrabotki neftyanykh mestorozhdeniy skvazhinami s gorizontal'nym okonchaniem (Theory and practice of oil field development using horizontal wells): Thesis of doctor of technical science, Bugul'ma: TatNIPINeft', 2012.
10. Zakirov S.N. et al., Novye printsipy i tekhnologii razrabotki mestorozhdeniy nefti i gaza (New principles and technologies of development the oil and gas fields), Part 2, Moscow – Izhevsk: Publ. of Institute of Computer Science, 2009, 484 p.
11. Ibatullin R.R., Salimov V.G., Nasybullin A.V., Salimov O.V., Estimating productivity of horisontal wells with longitudinal hydraulic fractures, Hydraulic Fracturing Quarterly, 2014, V. 1, no. 1, pp. 79–83.

Key words: Dupuis formula, skin-factor, absolute permeability, production rate, formation volume factor, horizontal well.

This paper discusses the reasons for discrepancy between production rates of horizontal wells calculated by analytic formulas and actual well rates from the Romashkino field. It has been found that analytical formulas derived on the basis of total pore volume concept based on absolute gas permeabilities do not consider formation volume and skin factors. Randomly assumed dimensions of a specific drainage volume model affect simulated results. Besides, analytic formulas do not consider reservoir heterogeneity and transient fluid flow observed after putting a well on stream. Therefore, such formulas should be used mainly for qualitative evaluation. The authors recommend using 3D sector or full-field reservoir models to predict horizontal well rates.
References
1. Grigoryan A.M., Vskrytie plastov mnogozaboynymi i gorizontal'nymi
skvazhinami (Drilling-in using horizontal and multilateral wells), Moscow:
Nedra Publ., 1969, 190 p.
2. Charnyy I.A., Podzemnaya gidromekhanika (The Underground hydromechanics), Moscow: Gostoptekhizdat Publ., 1948, 196 p.
3. Polubarinova-Kochina P.Ya., About directional and horizontal wells of finite length (In Russ.), Prikladnaya matematika i mekhanika, 1956, V. 20, no. 6, pp. 95–108.
4. Tabakov V.P., Determination of flow rate and the effectiveness of multilateral wells in layered reservoir (In Russ.), Proceedings of VNII, Moscow: Gostoptekhizdat Publ., 1960, V. 10, pp. 47–50.
5. Borisov Yu.P., Pilatovskiy V.P., Tabakov V.P., Razrabotka neftyanykh
mestorozhdeniy gorizontal'nymi i mnogozaboynymi skvazhinami (Development of oil fields using horizontal and multilateral wells), Moscow: Nedra Publ., 1964, 154 p.
6. Bady W.J., Odeh A.S., Productivity of horizontal well, SPERE, 1989, Nov.,
pp. 417–421.
7. Besson J., Performance of slanted and horizontal wells on an anisotropic
medium, Paper presented at European Petroleum Conference, 21-24 October,
The Hague, Netherlands, Oct. 22-24, 1990 (SPE-20965-MS).
8. Joshi S.D., Horizontal well technology, Tulsa, PennWell Books, 1991, 533 p.
9. Khakimzyanov I.N., Teoriya i praktika razrabotki neftyanykh mestorozhdeniy skvazhinami s gorizontal'nym okonchaniem (Theory and practice of oil field development using horizontal wells): Thesis of doctor of technical science, Bugul'ma: TatNIPINeft', 2012.
10. Zakirov S.N. et al., Novye printsipy i tekhnologii razrabotki mestorozhdeniy nefti i gaza (New principles and technologies of development the oil and gas fields), Part 2, Moscow – Izhevsk: Publ. of Institute of Computer Science, 2009, 484 p.
11. Ibatullin R.R., Salimov V.G., Nasybullin A.V., Salimov O.V., Estimating productivity of horisontal wells with longitudinal hydraulic fractures, Hydraulic Fracturing Quarterly, 2014, V. 1, no. 1, pp. 79–83.


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