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Method for delaying gelation of aequeous polymer solutions, solutions obtained by said method, and their use in oil wells

机译:延迟水性聚合物溶液胶凝的方法,通过所述方法获得的溶液及其在油井中的用途

摘要

A method has been discovered to delay the onset of gelation of partially hydrolysed polyacrylamides using polyphosphonate additives in the presence of a hexavalent chromium compound and a reducing agent. The preferred reducing agents are thiourea and sodium sulfite. By altering the temperature, pH and solution composition, high delays in gelation have been observed.
机译:已经发现一种在六价铬化合物和还原剂存在下使用多膦酸酯添加剂延迟部分水解的聚丙烯酰胺的胶凝作用的开始的方法。优选的还原剂是硫脲和亚硫酸钠。通过改变温度,pH和溶液组成,已观察到凝胶化的高度延迟。

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