利用磷硅酸盐-表面活性剂-聚合物复合体系提高原油采收率

Phosphorus silicate-surfactant-polymer complex system applied to enhance oil recovery in chemical flooding

"表面活性剂-碱-聚合物"三元复合体系是提高采收率的实用技术之一,但其中强碱NaOH会引起采油设备腐蚀和地层结垢问题,这影响了该技术的大规模推广应用。SJT-B助剂是一种磷硅酸盐化学助剂,用助剂代替碱进行了三元复合体系驱油实验。对表面活性剂-SJT-B助剂-聚合物三元复合体系的缓蚀防垢作用、界面张力、吸附、色谱分离、流动特性和驱油效果进行的研究结果表明,表面活性剂-SJT-B助剂-聚合物三元复合体系具有缓蚀防垢、降低界面张力的效果,且其动静吸附量低。以大庆杏树岗油田的地质特征为基础建立的物理模型上进行了驱油实验,结果证实,表面活性剂-SJT-B助剂-聚合物三元复合体系的调驱效果好于现有表面活性剂-碱-聚合物三元复合体系。

Alkaline-surfactant-polymer （ASP） flooding is one of the technologies for enhancing oil recovery. But its application is often restricted by some problems such as corrosion and scaling in the oil production equipments caused by NaOH in ASP flooding. The SJT-B aid is a newly developed phosphorus silicate chemical additive. Some experiments on the corrosion-prevention and anti-scaling properties, interracial tension,adsorption, the chromatographic separation degree of mixed solution, and the oil-displacement effect of the SJT-B aid-surfactant-polymer complex system were carried out. The results indicated that the complex system could efficiently decrease the interfacial tension and prevent the corrosion and scaling. The dynamic and static adsorptions of the surfactant-SJT-B aidpolymer complex system is almost the same as ASP in scale-prevention and anti-corrosion. The flooding experiments on the physical model with the same geological characteristics as Xingshugang Oilfield in Daqing validated that the flooding effect of the SJT-B aidsurfactant-polymer complex system was better than that of ASP.