A.S. Komisarenko, A.V. Kochetov, A.A. Zagorovskii, E.G. Kuznetsov, I.V. Fedortsov
Cavernous-fractured carbonate reservoir: problem of water-oil displacement ratio substantiation
Key words: CT-scanner; nondestructive method; whole core; core quality; control; fractured-cavernous cavitation; double porosity; flow testing.
For citation: Komisarenko A.S., Kochetov A.V., Zagorovskii A.A., Kuznetsov E.G., Fedortsov I.V. Cavernous-fractured carbonate reservoir: problem of water-oil displacement ratio substantiation. Geologiya nefti i gaza. 2021;(4):51–57. DOI: 10.31087/0016-7894-2021-4-51-57. In Russ.
The authors discuss a problem of displacement ratio estimation in cavernous-fractured carbonate reservoir in a laboratory waterflood simulation. Process of oil displacement with water was reproduced using a filtration setup providing P-T reservoir conditions and Toshiba Aquilion 16 medical CT-scanner integrated with it. Experimental studies were carried out on core plug cut out of whole cavernous-fractured carbonate core. In order to compare the results with the classical approach, experiments of carbonate reservoir physical modelling were carried out on standard-size samples cut out of the whole core tested in the first stage. Analysis of the data obtained showed the influence of “scale effect”. CT-scanning method and material balance method for calculation of all fluids released from the modelled reservoir were both used in estimation of oil saturation/displacement ratio determination.