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RELATION BETWEEN CATIONIC EXCHANGE CAPACITY, CLAY SWELLING AND CHEMICAL FORMATION DAMAGE OF PETROLEUM RESERVOIR

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Author(s): Abouzar Mirzaei Paiaman

Journal: Petroleum and Coal
ISSN 1337-7027

Volume: 51;
Issue: 4;
Start page: 255;
Date: 2009;
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Keywords: Chemical formation damage | clay swelling | CEC and pH.

ABSTRACT
Chemical formation damage as a result of clay swelling in Asmari reservoir, SW Iran, was investigated. In the first part of the work, a relation between pH of water based mud (WBM) filtrate and cationic exchange capacity (CEC) of clays was investigated. Clay samples were prepared from sample rocks. XRD method was applied for air dried, ethylene glycol solvated and heat treated clay samples. CEC values at standard and non standard pH values of filtrate were measured. There was a non linear relationship between pH of WBM filtrate and CEC. As pH of WBM filtrate increases, CEC decreases. In the second part of this work, permeability reduction due to the injection of WBM filtrate into core samples of shaly dolomite was measured. Filtrate with different pH values was injected into the core samples and percentage of permeability reduction due to clay swelling was measured. As pH of injected filtrate increases, severity of chemical formation damage reduces. The results could be used to investigate a qualitative relation between pH of filtrate, CEC of clay minerals, clay swelling and chemical formation damage potential of shaly dolomite.
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