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