Experimental Study of CO2 Contamination on the Porosity of Dry Kwale Field Reservoir Rock

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Author(s) Adebayo, Thomas Ayotunde | Olawumi Bukola Funke
Pages 343-345
Volume 1
Issue 7
Date July, 2012
Keywords porocity variation, CO2 contamination, CSS, Kwale field, Niger delta.
Abstract

Experimental study was carried out to investigate the effect of CO2 injection on the porosity of Kwale Field, Niger-Delta, reservoir rock samples. The drill cuttings used have porosity higher than the average Kwale field porosity and this could have been due to fracturing during drilling but it is still very applicable and authentic in this research. This is because investigation made was on variation in porosity due to reaction with injected CO2 and was carried out at moderate pressure of about 750oC that cannot worsen any existing fractures, if there is any at all. There was an increase in the porosity of sample 1 from 0.3773 to 0.5139 representing 36.2% increase while sample 2 has its porosity increased from 0.3727 to 0.8484 representing an increase of 29.48%. Since both were dry cores and injected at same CO2 pressure and temperature, it shows that the texture of the core has been eroded by the injected CO2. If the porosity variation was purely due to injection pressure, then there would have been same percentage increase in porosity but in this case the content of the samples must have contributed to porosity variation during contamination with CO2.

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