Abstract

The paper presents the results of integrated cavernous core sample studies with imitation of rock saturation typical for NMR studies area using a specially designed structure that allows fluid retention in outer caverns during NMR measurements. GeoSpec DRX-HF NMR-relaxometer has been selected for the studies whose resonant frequency is the same as of a downhole logging tool. Standard cutoffs for irreducible water and caverns in carbonate reservoirs applied for NMR interpretation are 90 ms and 750 ms, respectively. Their application often results in incorrect values of residual oil saturation and vuggy porosity. The paper discusses a common technique to define a cutoff that differentiates irreducible water from free water, as well as offers an efficient method to define cavern cutoffs by combination of laboratory NMR studies and X-ray computer tomography.

Key words:

total porosity according to NMR studies, cavernous porosity, well logging, X-ray computer tomography, nuclear magnetic logging (NML), nuclear magnetic resonance (NMR), specialized structure to retain fluid in caverns, NMR T2 distribution, bulk relaxation, surface relaxation, diffusional relaxation, irreducible water cutoff value, cavern cutoff value, fixed cutoff value method, spectral method, hydrogen content, permeability and porosity, residual water saturation, formation pay zone, extraction, desalting, bitumen, process liquids

References

V.M. Dobrynin, B.Yu. Vendelshtein, D.A. Kozhevnikov Petrophysics: textbook for higher education. Moscow, Nedra Publ., 1991 (in Russian)

M.A. Mikhaltsev, E.V. Terleeva М.А. Kompleksnoe izuchenie karbonatnyh kollektorov preobrazhenskogo gorizonta s cel'yu vybora optimal'nyh tekhnologij po uvelicheniyu nefteotdachi plasta [Carbonate reservoir characterization in Preobrazhensky horizon to select optimum EOR technologies]. 2013, pp.261-262 (in Russian)

V.G. Toporkov Yaderno-magnitnye skvazhinnye i analiticheskie metody v komplekse GIS pri reshenii petrofizicheskih, geofizicheskih i geologicheskih zadach na neftegazovyh mestorozhdeniyah [Nuclear magnetic downhole and analytical methods in a logging suite to solve petrophysical, geophysical and geological issues in oil-and-gas fields]. All-Russian Conference proceedings, 2014, pp. 233-248 (in Russian)

D.R. Koates, Li Chi Hiao, M.D. Prummer NMR logging: principles and application. Houston, Halliburton Energy Services, 1999, pp.71-88 (in English)

I.A. Vakhrusheva, Ya.I. Gilmanov, M.Yu. Nikolaev, M.I. Zagidullin Kompleksnaya metodika laboratornyh issledovanij kavernoznyh obrazcov kerna [Procedure for laboratory examination of cavernous core samples]. SPE-187871-RU, 2017, 17 p (in Russian)

V.G. Toporkov, P.V. Koshkin, M.Yu. Zubkov, A.G. Potapov Sopostavlenie rezul'tatov izmerenij relaksacionnyh krivyh YAMR, vypolnen-nyh na odnoj kollekcii obrazcov v pyati laboratoriyah Rossii [Comparison of NMR relaxation curve measurement results]. Proceedings of the conference “Nuclear magnetic downhole and analytical methods in a logging suite to solve petrophysical, geophysical and geological issues in oil-and-gas fields”. Moscow, VNIIgeosystem, 2014, 352 p (in Russian)

Authors

M.I. Zagidullin, LLC «Tyumen Petroleum Research Center»
42, M. Gorky st., Tyumen, 625002, Russian Federation
E-mail: mizagidullin2@tnnc.rosneft.ru

E.G. Kuznetsov, LLC «Tyumen Petroleum Research Center»
42, M. Gorky st., Tyumen, 625002, Russian Federation
E-mail: egkuznetsov2@tnnc.rosneft.ru

A.G. Potapov, LLC «Tyumen Petroleum Research Center»
42, M. Gorky st., Tyumen, 625002, Russian Federation
E-mail: agpotapov@tnnc.rosneft.ru

Ya.I. Gilmanov, PhD, LLC «Tyumen Petroleum Research Center»
42, M. Gorky st., Tyumen, 625002, Russian Federation
E-mail: YIGilmanov@tnnc.rosneft.ru

D.A. Lokshin, LLC RN-KrasnoyarskNIPIneft
65d, 9 May st., Krasnoyarsk, 660098, Russian Federation
E-mail: LokshinDA@knipi.rosneft.ru

For citation:

M.I. Zagidullin, E.G. Kuznetsov, A.G. Potapov, Ya.I. Gilmanov, D.A. Lokshin Ocenka vlijanija proniknovenija fil'trata burovogo rastvora v kavernoznyh kollektorah plasta B5 Danilovskogo mestorozhdenija na rezul'taty JaMK [Effect of mud filtrate invasion in cavernous reservoirs of B5 horizon in the Danilovsky field on NMR results]. Neftyanaya Provintsiya, No. 4(24), 2020. pp.175-196. DOI https://doi.org/10.25689/NP.2020.4.175-196 (in Russian)