Thermal performance challenges and prospectives of the Russian largest carbonate reservoir with heavy oil

Stanislav Ursegov, Evgenii Taraskin, Armen Zakharian

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    3 Citations (Scopus)

    Abstract

    In carbonate reservoirs with heavy oil, the implementation of "classical" thermal EOR methods such as cyclic steam stimulations, steamflooding, and steam assisted gravity drainage usually demonstrates a lower efficiency in comparison with sandstones. The key performance problems are a very complicated porous structure of carbonates represented by matrix blocks, fractures, and vuggs, and a negative wettability of carbonate rocks, which remains mostly oil-wet even with heating. These suggestions are fully confirmed by actual and laboratory results of the Permian - Carboniferous reservoir of the Usinsk field located in Northwest European Russia. The reservoir has the largest heavy oil remaining reserves in the carbonate reservoirs of Russia. Since the viscosity of its oil is more than 700 mPa*s, in some areas of the reservoir, there is a steam injection at ~300°C and ~10 MPa, which are being used for 25 years via vertical and horizontal wells. However, the current oil recovery numbers of the pilots are estimated only between 12 and 15 %. This work includes the analysis the results of recently conducted experimental studies with stacked core models and the actual production and injection data of the thermal pilots with different well configurations.

    Original languageEnglish
    Title of host publicationSociety of Petroleum Engineers - SPE EOR Conference at Oil and Gas West Asia 2018
    PublisherSociety of Petroleum Engineers
    ISBN (Electronic)9781613995693
    DOIs
    Publication statusPublished - 2018
    EventSPE EOR Conference at Oil and Gas West Asia, OGWA 2018 - Muscat, Oman
    Duration: 26 Mar 201828 Mar 2018

    Publication series

    NameSociety of Petroleum Engineers - SPE EOR Conference at Oil and Gas West Asia 2018
    Volume2018-March

    Conference

    ConferenceSPE EOR Conference at Oil and Gas West Asia, OGWA 2018
    Country/TerritoryOman
    CityMuscat
    Period26/03/1828/03/18

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