Experimental Study of the Change in Porosity of Imeri Oilsand Rock Contaminated with CO2

Adebayo, Thomas Ayotunde, Nwafor-Orizu Ezejanu N, Aria Osiwi


This research studies the effect of CO2 on Imeri oilsand located in Ogun East, Nigeria. The experiment is to investigate the possibility of using the oilsand as a possible CO2 storage reservoir and also to investigate the possible effect of CO2 leakage from nearby stored reservoir on the oilsand reservoir. It was observed that there was gradual increase in porosity of the oilsand core up to 7.89% in the first 16days after intermittent injection of CO2. After this maximum change in porosity there was a sudden gradual decrease in the measured porosity. The oilsand core outer surface was observed to have become hardened, with an increase of 30.94% in the fracture pressure, after 30 days of initial CO2 injection and after exposure to air forming and the formation of a seal-like material at the exposed outer surface. This is suspected to be due to reaction of this oilsand with the injected CO2 resulting into formation of cementing material or a type of CO2 hydrates. The material formed is been investigated in the second part of this research as it may be a very good sealing material which could provide clue to the storage ability of oilsand as a CO2 storage.

Keywords: Oilsand, CO2 contamination, CSS, crude viscosity, Imeri oilsand, Nigeria oilsand

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ISSN (Paper)2224-7467 ISSN (Online)2225-0913

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