Scientific and technical journal
«Oilfield engineering»
ISSN 0207-2351
Back to issue Specific features of mutual solvents influence on low-permeable rocks of the Bazhenov formation
UDC: 622.276.6
DOI: -
Authors:
1,2,3,5,61 Gazpromneft - Technology Partnerships, St. Petersburg, Russia
2 A.N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences (INEOS RAS), Moscow, Russia
3 Gazprom neft, St. Petersburg, Russia
4 World-class scientific center "Rational development of the planet’s liquid hydrocarbon reserves", Moscow, Russia
5 National University of Oil and Gas "Gubkin University", Moscow, Russia
6 Institute of Oil and Gas Problems of the Russian Academy of Sciences
Keywords: low-permeable reservoirs, oil filtration, nuclear magnetic resonance, methanol
Annotation:
The paper aims to highlight the problem of permeability decrease with aqueous solutions injection into low-permeable reservoirs, in particular into the Bazhenov formation serieses. The filtration of oil and then water through the low permeable core samples of the Bazhenov formation was explored, accompanied with nuclear magnetic resonance (NMR) research of the pore volume. A 10-times reduction of the permeability was obtained after water filtration experiments. Then the permeability restoring due to filtration of a mutual solvent (methanol) was observed. The article put forward hypotheses about the effect of mutual solvents on bound oil and water in the pore surface as well as the possibility of using well treatments by chemicals soluble in both oil and water.
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