【摘要】 采用EDAX,XRD和SEM等方法对大庆油田三元复合驱结垢样品中碳酸钙的结晶特性及形貌特征进行了研究.结果表明,结垢样品中的碳酸钙呈现出球形、棒状和花状等形貌特征和层状生长的结晶特征.部分水解聚丙烯酰胺(HPAM)降低了重烷基苯磺酸盐(HABS)表面活性剂的临界胶束浓度(cmc),促进了其胶束化作用;HABS使溶液中HPAM链的刚性增强,负电吸引能力增强;二者均会形成模板,导致结垢样品中的碳酸钙具有不同的形貌特征.聚丙烯酰胺和表面活性剂的存在未改变结垢样品中碳酸钙的层状生长特征.更多还原

【Abstract】 Alkaline surfactant polymer(ASP) flooding could improve oil recovery considerably,however,scales have also been found in the injection and production systems simultaneously.Investigation shows that CaCO 3 of scaled sample has different morphological characters such as stick and sphere,and sliver crystallographic character.Due to the existence of partial hydrolyzed polyacrylamide(HPAM),the critical micelle concentration for the heavy alkyl benzene sulfonate surfactant(HABS) decreases,i.e.,micellization of HABS could be accelerated.On the other hand,the addition of HABS accelerates negative electric attract ability of HPAM and makes the steely properties of the chains stronger.Micelle and HPAM could act as template,which leads to the formation of CaCO 3 in the scaled sample with different morphologies.In addition,the coexistenceof HPAM and surfactant does not change the character of sliver CaCO 3 in the scaled sample.This study will be helpful for deep analysis on ASP flooding scaling mechanism,scale remover and inhibitor,and thereby increase the service life of ASP flooding well,scale up and popularize the ASP flooding.更多还原