强化泡沫体系气液界面流变性对驱油效果的影响  

Effect of enhanced rheological behavior of gas liquid interface on displacement efficiency of foam system

作　　者：李星[1] LI Xing(Exploration&Development Research Institute of Dagang Oilfield Co.,Ltd.,PetroChina,Daqing,Heilongjiang163712,China)

机构地区：[1]中国石油大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《石油地质与工程》2021年第2期72-75,79,共5页Petroleum Geology and Engineering

摘　　要：以α烯烃磺酸钠和商品稳泡剂作为发泡表面活性剂,添加不同类型聚合物,通过气泡悬滴驰豫震荡法,测定不同强化泡沫体系的气液界面扩张流变参数,并测定其半衰期,得出不同扩张流变性能对泡沫稳定性和驱油效果的影响。实验表明,聚合物溶液浓度增加时,界面黏弹模量也增加,大幅增加气液界面黏性模量能够达到稳泡效果,驱油效果得到大幅改善。生物聚合物有很高的界面黏弹模量,界面黏性模量是影响泡沫半衰期的主要因素,增加气液界面黏性模量是提高泡沫半衰期的有效方法。界面弹性模量对泡沫驱油效果和注入能力影响很大,过高的弹性模量会导致泡沫变形阻力增大,造成地层堵塞注入困难,选择适当气液界面黏弹模量的泡沫体系,能达到较好的泡沫驱油效果。Sodiumα-olefin sulfonate and commercial foam stabilizer were used as foaming surfactants,and different types of polymers were added.Through the bubble drop relaxation oscillation method,the dilatational rheological parameters of different reinforcement foam systems were measured and their half-life period was measured.The effect of different expansion rheology on foam stability and oil displacement efficiency was obtained.The results show that the interfacial viscoelastic modulus increases with the increase of polymer concentration.Biopolymers have high interfacial viscoelastic modulus.The interfacial viscosity modulus is the main factor affecting the half-life period of foam.Increasing the viscosity modulus of gas-liquid interface is an effective way to improve the foam half-life period.The elastic modulus of the interface has great influence on the foam flooding effect and injection ability.The excessive elastic modulus will lead to the increase of foam deformation resistance,resulting in difficulty in formation plugging and injection.The foam system with proper gas liquid interface viscoelastic modulus can achieve better foam flooding effect.

关 键 词：大庆油田 界面扩张流变 泡沫半衰期 泡沫驱油 界面黏弹模量 

分 类 号：TE357[石油与天然气工程—油气田开发工程]