فهرست نشریات علمی دسترسی آزاد ایران

Water injection into oil reservoirs is a common method to compensate for the pressure drop due to oil production. Injection water is mainly seawater, which contains ions such as sulfate and carbonate. Formation water generally contains cations such as calcium, barium, strontium, etc. Therefore, mineral scales are formed as a result of mixing injection water with formation brine. One of the most important problems in water injection operation is the formation of mineral scales, which causes reservoir damage, loss of production, pressure reduction, depreciation of the wellhead equipment, and in more severe cases, well closure. Using scale inhibitors is an effective method to prevent scale formation. In this study, olive leaf extract was used as a green inhibitor to prevent and reduce barite scale formation. For this purpose, water samples were synthesized according to real ionic composition of formation brine and sea water, and mixed at different mixing ratios. The inhibition performance of olive leaf extract was explored at different concentrations. Characterization of the used extract was carried out using FTIR analysis. The highest amount of barium sulfate precipitation was observed 0.37 gr/l in the mixture containing 90% formation brine. Experimental results indicated that the most effective concentration of the inhibitor for reduction of scale formation is 20 ml/l. Moreover, the effect of pH value and salinity of injection water was investigated and the best performance of inhibitor was observed at 4100 ppm salinity and pH 7.7.