Studying the effectiveness of non-stationary drainage technology in the operation of horizontal wells

UDK: 622.276.1/.4:622.243.24

DOI: 10.24887/0028-2448-2020-7-26-29

Key words: oil recovery factor, non-stationary drainage, hard-to-recover reserves, optical methods, chromatography

Authors: I.A. Guskova (Almetyevsk State Oil Institute, RF, Almetyevsk), L.I. Garipova (Almetyevsk State Oil Institute, RF, Almetyevsk), D.R. Khayarova (Almetyevsk State Oil Institute, RF, Almetyevsk), I.F. Galimov (Oil and Gas Production Department Leninogorskneft, RF, Leninigorsk), A.S. Akhmetshina (Oil and Gas Production Department Leninogorskneft, RF, Leninigorsk)

Horizontal technologies are widely used in fields with a high degree of depletion of oil reserves. To enter into the active development of hard-to-recover oil reserves, it is necessary to have a more detailed idea of the quality of the reserves involved in the development to justify the most effective reservoir drainage regimes. In the conditions of oil fields of the Republic of Tatarstan, deposits for drilling horizontal wells include deposits of complex geological structure with increased oil viscosity, which may result in low productivity of conventionally vertical wells. The proposed research experience allows us to justify the effective mode of operation of horizontal wells, to increase the oil recovery coefficient, while improving economic development indicators. The paper presents the results of a comparative analysis of the efficiency of non-stationary drainage regime for vertical and horizontal wells, based on the evaluation of the results of spectrophotometric studies to determine the degree of transformation involved in the development of oil. The change in the drainage regime led to a decrease in the value of the light absorption coefficient of the horizontal well oil to a greater extent than for the conditions of the vertical well, which indicates the involvement in the development of untransformed (matrix) oil and an increase in the reservoir coverage factor. It is noted that the change in the drainage regime did not lead to a qualitative change in the asphaltenes of oil deposits for both horizontal and vertical wells. References 1. Khisamov R.S., Effektivnost' vyrabotki trudnoizvlekaemykh zapasov nefti (Efficiency of stranded oil development), Kazan: Fen Publ., 2013, 310 p. 2. Shaydullin R.G., Gus'kov D.V., Fracture formation model in carbonate array 302, reservoir 303 Romashkinskoye oilfield (In Russ.), Georesursy, 2006, V. 21, no. 4, pp. 14–17. 3. Patent RU 2695183 C1, Method for non-stationary collection of liquid from a fracture-porous type collector, Inventors: Gus'kova I.A., Nurgaliev R.Z., Garipova L.I., Khayarova D.R. 4. Yusupova T.N., Ganeeva Yu.M., Romanov G.V., Barskaya E.E., Fiziko-khimicheskie protsessy v produktivnykh neftyanykh plastakh (Physical and chemical processes in the productive oil reservoirs), Moscow: Nauka Publ., 2015, 412 p. 5. Kayukova G.P., Romanov G.V., Lukyanova R.G., Sharipova N.S., Organicheskaya geokhimiya osadochnoy tolshchi i fundamenta territorii Tatarstana (Organic geochemistry of sedimentary strata and basement of the territory of Tatarstan), Moscow: GEOS Publ., 2009, 487 p. 6. Evdokimov I.N., Losev A.P., Vozmozhnosti metodov issledovaniy v sistemakh kontrolya razrabotki neftyanykh mestorozhdeniy (Possibilities of research methods in oilfield development control systems), Moscow: Neft’ I Gas Publ., 2007, 228 p. 7. Ibatullin R.R., Ibragimov N.G., Takhautdinov Sh.F., Khisamov R.S., Uvelichenie nefteotdachi na pozdney stadii razrabotki mestorozhdeniy. Teoriya. Metody. Praktika (Enhanced oil recovery at a late stage of field development. Theory. Methods. Practice), Moscow: Nedra-Biznestsentr Publ., 2004, 292 p. 8. Petrova L.M., Formirovanie sostava ostatochnykh neftey (Residual oil composition), Kazan: Fen Publ., 2008, 204 p.