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对在表面活性剂驱过程中木质素磺酸盐作为牺牲剂的可行性进行了研究。该技术是基于高效液相色谱 (HPLC)分析 ,来测定木质素磺酸盐和石油磺酸盐的浓度。建立木质素磺酸盐和石油磺酸盐的吸附等温线来评价木质素磺酸盐的牺牲效果。开发了一个用来描述在木质素磺酸盐存在下的离子交换的简单模型 ,这个模型中包含了阳离子与木质素磺酸盐的联系。本项研究的主要结果有四个方面。第一 ,用木质素磺酸盐预冲洗处理孔隙介质 ,可以显著地降低表面活性剂的损失 (降低量大于 50 % ) ,然而 ,当木质素磺酸盐与表面活性剂段塞混合在一起时 ,表面活性剂损失的降低就很少。第二 ,在木质素磺酸盐存在时有更多的阳离子从岩石上进行交换 ,这种阳离子交换的增强是二价阳离子与木质素磺酸盐结合的结果。第三 ,与盐水和石油磺酸盐相比 ,木质素磺酸盐会导致可溶性矿石的更大程度的溶解 ,产生了不需要的二价阳离子。第四 ,木质素磺酸盐对石油磺酸盐的耐盐度和最优矿化度的影响并不大。从这些实验室结果 ,总结出在表面活性剂驱中木质素磺酸盐是很有潜力的吸附牺牲剂
The feasibility of using lignosulfonate as a sacrificial agent during surfactant flooding was investigated. The technique is based on high performance liquid chromatography (HPLC) analysis to determine the concentration of lignosulphonate and petroleum sulfonate. The adsorption isotherms of lignosulfonates and petroleum sulfonates were established to evaluate the sacrificial effects of lignosulfonates. A simple model was developed to describe ion exchange in the presence of lignosulfonates. This model contains the linkages of cations with lignosulfonates. The main results of this study have four aspects. First, pretreatment of pore media with lignosulfonate significantly reduced the surfactant loss by> 50%, however, when the lignosulfonate was mixed with the surfactant slug , The reduction of surfactant loss is very small. Second, more cations are exchanged from the rock in the presence of lignosulfonates. This enhancement of cation exchange is the result of the combination of the divalent cation with the lignosulfonate. Third, lignosulfonates lead to a greater degree of dissolution of soluble ores than brine and petroleum sulfonates, creating unwanted divalent cations. Fourth, the effect of lignosulfonates on the salinity and optimal salinity of petroleum sulfonates is not significant. From these laboratory results, it is concluded that lignosulfonate is a potential adsorption sacrificial agent in surfactant flooding