Nonpolymeric phosphonates are well-known scale inhibitors in the upstream oil and gas industry because they afford several advantages over other classes of inhibitors. But few of these phosphonates show good environmental properties as well as good thermal stability for high-temperature squeeze applications. Given the known high seawater biodegradability of benzoic acid, we have synthesized and tested several easily accessible monoaromatic phosphonates. The tests include dynamic tube-blocking experiments for both calcite and barite scaling, thermal stability, calcium compatibility, and seawater biodegradation according to the OECD 306 protocol. The new aromatic inhibitors were compared to known aminophosphonate scale inhibitors including the aromatic amino acid derivative, phenylalanine diaminomethylenediphosphonate. The results indicate that improved performance can be obtained together with good thermal stability for the phenolic derivatives, but too much aromatic ring substitutions lead to lower biodegradation.

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新型芳族氨基亚甲基膦酸酯作为油田阻垢剂的研究

非聚合膦酸酯是上游石油和天然气工业中众所周知的阻垢剂，因为与其他类型的抑制剂相比，它们具有多种优势。但是这些膦酸酯中很少有对高温挤压应用表现出良好的环境性能以及良好的热稳定性的。已知苯甲酸具有很高的海水可生物降解性，我们已经合成并测试了几种容易获得的单芳族膦酸酯。测试包括根据OECD 306协议进行的方解石和重晶石结垢，热稳定性，钙相容性和海水生物降解的动态管塞实验。将新的芳族抑制剂与已知的氨基膦酸酯阻垢剂进行了比较，其中包括芳族氨基酸衍生物苯丙氨酸二氨基亚甲基二膦酸酯。