复配阻垢剂对碳酸钙阻垢效果及垢晶微观形貌影响

针对石南1631注水井结垢问题，以该注水井水样分析数据为基础，应用Scale-Chem结垢预测软件对该注水井的结垢类型进行了预测，得到该注水井的主要结垢类型为碳酸钙垢，并与现场垢样分析结果进行了对比。为了减缓结垢对注水的影响，选用五种阻垢剂对该注水井水样开展了阻垢效果研究。在阻垢剂单剂对注入水水样阻垢效果实验研究的基础上，将优选出的阻垢剂PESA与DTPMPA以2:1 复配，当阻垢剂浓度为80mg/L时，阻垢率达到90.26%。为明确复配阻垢剂的阻垢机理，对加入不同复配阻垢剂浓度前后形成的垢晶进行了扫描电镜分析与X-射线衍射分析，分析结果表明，复配阻垢剂对碳酸钙晶体的形貌与晶体粒径均有一定程度的影响，在实验所用复配阻垢剂浓度范围内，阻垢剂浓度越高，碳酸钙晶体的平均粒径越小；复配阻垢剂主要通过螯合增溶与晶格畸变，在碳酸钙垢的形成过程起到了抑制作用。

Study on the influence of compound scale inhibitor on the scale inhibition effect and scale crystal morphology of calcium carbonate

Aiming at the Scaling problem of Shinan1631 injection well, scale-Chem Scale prediction software was used to predict the Scale formation type of the injection well based on the analysis result of the injection well. It was found that calcium carbonate was the main fouling type of the injection well, and the prediction result was compared with the field Scale samples. In order to reduce the influence of scale formation on water injection, five scale inhibitors were selected to study the scale inhibition effect of the injected water samples in this well. The experiments confirmed that the best ratio of compound inhibitor is 2:1(PESA:DTPMPA), the anti-scaling efficiency reached 90.26% when the concentration of inhibitor was 80mg/L. X-ray analysis and scanning electron microscopy studies of the calcium carbonate in the absence and presence of different inhibitor showed that compound inhibitor could obviously affected the morphology and particle size of calcium carbonate. The average particle size of scale was inversely proportional to the concentration of inhibitor in the experimental concentration. The compound scale inhibitor can restrain the growth of calcium carbonate scale by chelation and lattice distortion mechanism.