Modeling of Tubing Pickling in Conjunction With Acidizing Treatments
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The main purpose of the chemical stimulation treatment is to remove formation damage and enhance well productivity. Proposed mechanisms to explain the behavior of acid contact with the tubing are presented and a mathematical model for predicting acid consumption and dissolution of tubular contaminants is developed. The model is developed for the bull-heading case where the pickling acid is pumped down the tubing, then flowed back to the surface. The model considers the reaction of acid with mill scale (Fe3O4). The equations formulated are solved numerically to predict the concentrations of major chemical species as a function of position along the tubing and in the effluent form the well during flowback. This is an abstract of a paper presented at the SPE International Symposium on Oilfield Chemistry (Houston, TX 2/2-4/2005).
author list (cited authors)
Al-Mutairi, S. H., Hill, A. D., & Nasr-El-Din, H. A.