پديدآورندگان :
Mohammadzadeh Shirazi Meisam mmohshirazi@gmail.com Sharif University of Technology , Ghotbi Cyrus Ghotbi@sharif.ir Sharif University of Technology , Safian Gholam Abbas safian.gh@gmail.ir Sharif University of Technology , Ayatollahi Shahab shahab@sharif.ir Sharif University of Technology
كليدواژه :
Asphaltic sludge , Acidizing , compatibility , Formation damage
چكيده فارسي :
Acidizing is one of the most effective technique to overcome formation damage and restore (or even increase) the permeability of near wellbore region. Although this technique is proven and widely used to eliminate damages, it could be induced new damages itself that hinder the fluid flow and decrease (or stopping) well production, consequently. Acid sludge formation is known as a major induced formation damage and one main reason for oil well acid treatment failures. In this study, the asphaltic sludge caused due to acid-oil contact was evaluated quantitatively. Several compatibility tests were conducted between HCl and four Iranian acid sensitive crude oils (A, B, C, D) to determine the influence and interaction of operational factors. The acid concentration, iron ion presence and acid-mixture ratio were selected as variable factors. Results revealed the factors were affected on the sludge formation regarding to the crude oil property and their influence was severely interacted with each other. Besides incremental behaviors of acid and ferric concentration, the acid-mixture ratio was impacted sludge formation extraordinary. By regulating these factors and without using any preventative additives, the risk of dried asphaltic sludge formed were dropped to 7%, 5.6%, 7.5%, 22%, for the crude oils A, B, C and D, respectively.
