Mechanisms and experimental research of ion-matched waterflooding to enhance oil recovery in carbonate reservoirs: A case of Cretaceous limestone reservoirs in Halfaya Oilfield, Middle East

PENG Yingfeng,LI Yiqiang,ZHU Guangya,PAN Deng,XU Shanzhi,WANG Xiuyu

Fig. 7. The relationships between the sum of concentration, the sum of effective concentration and the activity coefficient of PDIs in formation water with IS.