Estimating the Efficiency of the Wellbore Zone Treatment by a Heat-Produced Binary Mixture

About the authors:

Artem I. Varavva, Chief Specialist, Gazprom Neft (Tyumen); artevar@yandex.ru

Alexey V. Tatosov, Dr. Sci. (Phys.-Math.), Professor, Department of Fundamental Mathematics and Mechanics, University of Tyumen; atatosov@utmn.ru

Vladimir E. Vershinin, Associate Professor, Department of Physical Processes and Systems Modeling, University of Tyumen; eLibrary AuthorID, Scopus AuthorID, v.e.vershinin@utmn.ru

Abstract:

The development of heavy oil reserves is constantly increasing. An implementation of enhanced oil recovery methods and stimulating production methods are required for high viscosity oil production. The evolution of the methods development is becoming more essential. First of all, that includes the methods of stimulating production, which are used to reduce the high filtration resistances in production well equipment and in the bottomhole formation zone.

Recently, there has been an increasing interest in using of the thermogas-chemical well treatments in bottomhole formation zone. One of the most promising technique is the method of well treatment by the heat-produced binary mixture. The chemically active components injected into the well decompose in the bottomhole formation zone with an emission of gas and heat. As a result of treatment by binary mixtures, the viscosity of the oil reduces, the bottomhole zone calmatation disappears, waxes wash out, and the natural fracturing of the carbonate reservoirs increases. These factors lead to well productivity increasing.

This paper studies the process of injection into the productive formation an aqueous mixture with chemically active components. The mathematical model is proposed and resolved numerically. The results are compared with the actual field data of the well treated with the binary mixture. The contribution to additional oil recovery obtained after treatment is estimated by various factors, such as reducing the oil viscosity oil and cleaning the bottomhole zone.

References:

1. Aleksandrov E. N., Kuznecov N. M., Kozlov S. N., Serkin Yu. G., Nizova E. E. 2016. “Dobycha trudnoizvlekaemykh i neizvlekaemykh zapasov nefti s pomoshchyu tekhnologii binarnykh smesey” [Production Numbers and Non-Removable Oil Reserves Using Binary Mixtures]. Georesursy, vol. 18, no 3, pt. 1, pp. 154-159
2. Varavva A. I., Vershinin V. E., Idiyatullin R. A. 2017. “Issledovanie kinetiki razlozheniya binarnoy smesi primenitelno k vozdeystviyu na neftyanoy plast” [Filing Model Responsive Binary Mixtures into the Reservoir]. Izvestiya vysshikh uchebnykh zavedeniy. Neft i gaz, no 6, pp. 67-72
3. Vargaftik. N. B. 1972. Spravochnik po teplofizicheskim svoystvam gazov i zhidkostey [Handbook of Thermal Properties of Gases and Liquids]. Moscow: Nauka.
4. Vershinin V., Fedorov K., Lishchuk A. 2016. “Mechanisms of thermal-pressure induced impact of binary mixture reaction near wellbore”. Paper presented at SPE Russian petroleum technology conference and exhibition (Moscow). SPE 182048-RU.
5. Gimatudinov Sh. K. 1971. Fizika neftyanogo i gazovogo plasta [Physics of Oil and Gas Reservoir]. Moscow: Nedra.
6. Kuznetsov S. V. 2016. “Issledovanie teplofizicheskikh protsessov pri filtracii parafinistoy nefti k gorizontalnoy skvazhine” [Research of Thermophysical Processes while Filtering Parafine oil by Horizontal Borehole]. Cand. Sci. (Phys.-Math.) diss. Tyumen: University of Tyumen.
7. Idiyatullin A. R., Zavolzhskiy V. B., Ilyin V. P., Sadriev F. L. et. al. 2014. RF Patent no 2525386с2, 10 August. Termogazokhimicheskiy sostav i sposob primeneniya dlya obrabotki prizaboynoy i udalennoy zony produktivnogo plasta [Termal Gas and Chemistry Composition and Method of Use for Processing of Bottomhole Formation Zone and a Remote Reservoir]. No 2012150375/03.
8. Ring J. N. et al. 1994. “Simulation of Paraffin Deposition in Reservoir”. SPE Production & Facilities., vol. 9, no 01. pp. 36-42. SPE-24069.
9. Viswanath D. S., Ghosh T. K., Prasad D. H. L., Dutt N. V. K., Rani K. Y. 2007. Viscosity of Liquids: Theory, Estimation, Experiment, and Data. Dordrecht, The Netherlands: Springer Science & Business Media.