IJE TRANSACTIONS A: Basics Vol. 31, No. 10 (October 2018) 1793-1800   

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A. Khormali, Anar R. Sharifov and Dmitry I. Torba
( Received: November 28, 2017 – Accepted: August 17, 2018 )

Abstract    Scale formation is one of the main problems during waterflooding. Barium sulfate (BaSO4) is often formed due to mixing incompatible waters. Injecting scale inhibitors into the reservoirs is an effective method for prevention of salt depositions. Prediction of amount of salt precipitation can help to effectively use scale inhibitors. In this work, scaling tendency of BaSO4 and its amount of precipitation was determined depending on temperature, pressure and mixing ratio of injection and formation waters. Results showed that BaSO4 precipitation is largely dependent on mixing ratio. Temperature and pressure have no influence on BaSO4 precipitation. Different scale inhibitors, including a new inhibitor, were used for preventing BaSO4 precipitation. Interfacial tension was investigated on the boundary of oil and new inhibitor for determining required concentration of hydrochloric acid in the inhibitor. The lowest interfacial tension occurred at 10% of hydrochloric acid. In addition, effect of temperature, mixing ratio and barium concentration on the inhibition efficiency of BaSO4 formation was studied. Moreover, formation damage due to BaSO4 formation with and without scale inhibitors was determined by core flood tests. Results showed that the new inhibitor has the highest efficiency for preventing BaSO4 precipitation at any temperature, mixing ratio and barium concentration. In the presence of new inhibitors, rock permeability was improved from 59% to 92.4% of its initial value. Also, a change in the inhibitor concentration during injecting into the reservoir was simulated depending on the amount of water cut, production period and radial distance from well.


Keywords    Barium Sulfate, Formation Damage, Scale Inhibition, Scale Prediction


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