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针对陕北某油井稠化酸返排液pH低,SS含量高,低透光率等特点,通过分析稠化酸返排液的水质组成性质,采用Scalechem软件对稠化酸返排液与注入水的不同配比混掺进行结垢预测分析,并选择絮凝方法,对返排液进行处理。结果表明:在井筒水平段,CaCO_3结垢量为522mg/L,BaSO_4结垢量为159mg/L;在地面管线中,CaCO_3结垢量为540 mg/L,BaSO_4结垢量为172 mg/L,均不符合油田回注水标准(SY/T5329-2012)。通过絮凝对稠化酸返排液处理,PAC投加量为500mg/L、CPAM投加量为1.2mg/L、加药间隔时间为20s、搅拌时间为5min时,稠化酸返排液透光率为89.8%,处理后稠化酸返排液和注入水按不同体积比混合,CaCO_3结垢量降低99.9%,BaSO_4结垢量降低超过87.4%,混合水配伍性良好,达到油田回注水标准,且混合后可降低界面张力,有利于提高注入水驱油效率。
Aiming at the characteristics of low viscosity, high SS content and low light transmittance of thickened acid in an oil well in north Shaanxi, by analyzing the water quality composition of the thickened acid backwash, Water mixed with different proportions of fouling prediction and analysis, and select the flocculation method, the return fluid for processing. The results showed that the scale of CaCO_3 was 522mg / L and the amount of BaSO_4 was 159mg / L at the horizontal section of wellbore. The scale of CaCO_3 was 540 mg / L and the amount of scale of BaSO_4 was 172 mg / L , Are not in line with the oilfield injection water standards (SY / T5329-2012). By flocculation of thickened acid back to the liquid, PAC dosage 500mg / L, CPAM dosage 1.2mg / L, dosing interval 20s, stirring time 5min, The light rate was 89.8%. After the treatment, the thickening acid backflow and injection water were mixed at different volume ratios, the scale of CaCO_3 was reduced by 99.9% and the scale of BaSO_4 was reduced by more than 87.4%. The compatibility of mixed water was good, Standard, and after mixing can reduce the interfacial tension, help to improve the efficiency of water flooding.