A recent study has demonstrated the importance of cation exchange capacity in determining optimum use concentrations of cationic clay control agents.

Determining the concentration of polymer required to adequately stabilize clays is dependent upon many factors. Normally, the concentration required for clay control is based only on the clay content of the reservoir. In addition to the clay content, careful consideration should also be given to the type of clay, the natural wettability of the reservoir, the adsorbed cations in equilibrium with the formation, the treating fluid and the additive concentration in the treating fluid. It is important to consider all of these factors for each reservoir to be treated; however, some of the factors may not be known. The most important factor is the cation exchange capacity of the reservoir rock. This may be determined in the laboratory and used to predict the required concentration of the cationic additive to obtain stabilization.

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