Isothermal filtration processes in layered inhomogeneous permeability heavy oil reservoir are considered. The results of hydrodynamic calculations are given. It is shown that thermal treatment of layered inhomogeneous permeability reservoirs are almost always results in positive technological effect. In case of non-uniform permeable stratum, when permeability of layers differs a lot, thermal treatment allows to significantly increase oil recovery, and the effect is quickly growing. At the same time a volume of liquid withdrawals rises. This type of collector is the most favorable for thermal recovery. For such collectors in the long-term prospect the effectiveness of thermal treatment doesn’t depend on the entry level of water-cut. However, to quickly process a positive effect of hot water injection it is recommended to implement thermal recovery from the beginning of deposits development. If the collector consists of the high permeability layers only, when permeability differs by two times or less, the effect of thermal exposure insignificant in magnitude and increases slowly. This case is characterized by a significant dependence on the entry level of water-cut. The largest increase of oil recovery factor is achieved in a variant when the injection of hot water begins at high water-cut.
References
1. Surguchev M.L., Vtorichnye i tretichnye metody uvelicheniya nefteotdachi
plastov (Secondary and tertiary methods of enhanced oil recovery),
Moscow: Nedra Publ., 1985, 308 p.
2. Ponomarev A.I., Povyshenie effektivnosti razrabotki zalezhey uglevodorodov
v nizkopronitsaemykh i sloisto-neodnorodnykh kollektorakh (Improving
the efficiency of the development of hydrocarbon deposits in low permeability
and layered reservoirs), Novosibirsk: Publ. of SB RAS, 2007, 236 p.
3. Muslimov R.Kh., Sovremennye metody upravleniya razrabotkoy neftyanykh
mestorozhdeniy s primeneniem zavodneniya (Modern methods of development
of oil fields with the use the waterflooding), Kazan: Publ. of Kazan University,
2003, 596 p.
4. Vladimirov I.V., Problemy vyrabotki zapasov nefti iz neodnorodnykh po
pronitsaemosti kollektorov pri ikh zavodnenii (Problems of development of oil
reserves of inhomogeneous permeability reservoir during the flooding), Collected
papers “Problemy razrabotki mestorozhdeniy s trudnoizvlekaemymi
zapasami nefti” (Problems of development of deposits with hard to recover
reserves): edited by Kryanev D.Yu., Zhdanov S.A., Proceedings of VNIIneft',
V. 144, Moscow: Publ. of VNIIneft', 2011, 158 p.
5. Vladimirov I.V., Veliev E.M., Studying the non-isothermal filtration processes
in porous reservoirs when applying thermal techniques to develop viscous oil
deposits (In Russ.), Problemy sbora, podgotovki i transporta nefti i nefteproduktov,
2014, no. 2 (96), pp. 27–39.
