An Analysis of Reservoir Chemical Treatments

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Abstract
Summary: In chemical well treatments, success or failure is often difficult or impossible to anticipate. The near-wellbore pressure drawdown and fines migration contribute to the overall well damage, but the effect of the chemical treatment alone can induce damage by reprecipitation when the spent treatment solution is produced over the treated zone. The identity, amount, and rate of return of this reprecipitation damage are discussed here. Our procedure considers the chemical interaction of formation minerals and brine with the treatment solution in the presence of an immiscible phase. Although this analysis contains several simplifying assumptions, the results can be applied, with care, to lend insight and direction to practical problems. If relative permeabilities and mineral and injected water compositions are known, the analysis procedure will estimate the success of the treatment and indicate approximate treatment duration.