Effects of Ultrasound on Silicon Scale Ions and Antiscaling Performance
1. School of Chemistry & Chemical Engineering, Northeast Petroleum University, Daqing 163318, China；
2. No 2 Petroleum Production of Daqing Oil Field, Daqing 163414, China
Abstract The application of the ASP(alkaline, surfactant and polymer) flooding oil production technology causes serious scaling in oil field pipelines and equipments. Silicate scale is the main ingredient. In this paper, the mechanism of the ultrasonic antiscaling was briefly described and the effects of single and double ultrasound with different frequency ultrasonic waves on ion concentration were studied through contrast experiments in the saturated solution of calcium silicate. Discussion on the scale inhibition effect was followed. It was found that there was the concentration difference of the scale ions between the filtered and unfiltered liquids, which proved the presence of crystallites in the solution. Meanwhile, the low-frequency double ultrasonic antiscaling efficiency for silicon scale was found to be the best. The characterization results of X-ray diffraction (XRD) and scanning electron microscopy (SEM) showed that ultrasound could suppress ion into the crystallite formation, delay the induction period and interfere the crystallites on aggregating into scale, therefore, reduce the fouling rate greatly.
