SiO_2/SDS复合体系CO_2泡沫驱油性能实验研究  

Experimental Study on Oil Displacing Ability of CO_2 Foam Stabilized by SiO_2/SDS Composite System

作　　者：王鹏 李兆敏[2] 李杨[3] 袁泽波[1] 张弛[4] 

机构地区：[1]塔里木油田分公司油气工程研究院,新疆库尔勒841000 [2]中国石油大学(华东)石油工程学院,山东青岛266580 [3]塔里木油田分公司勘探开发研究院,新疆库尔勒841000 [4]塔里木油田分公司勘探事业部,新疆库尔勒841000

出　　处：《西安石油大学学报（自然科学版）》2016年第6期72-79,共8页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家自然科学基金"改性纳米二氧化硅和表面活性剂协同作用的CO2泡沫稳定机理及渗流特征"(编号:51274228);国家自然科学基金"油藏条件下超临界CO2乳液转相乳化规律及渗流特征"(编号:51304229);山东省自然科学基金"改性二氧化硅纳米颗粒对CO2泡沫稳定性的影响机理及应用研究"(编号:2012ZRE28014)

摘　　要：以无机SiO2纳米颗粒与SDS协同稳定的CO2泡沫为研究对象,研究了该复合体系泡沫的耐温、耐油性能,并通过物理模拟实验研究了其驱油机理及性能。结果表明：复合体系中SDS质量分数为0.25%、SiO2纳米颗粒质量分数为1.5%时,CO2泡沫在80℃条件下半衰期可达25.3 min,相比较单一SDS体系CO2泡沫半衰期延长23.8 min;原油体积分数10%时,复合体系CO2泡沫半衰期相较于单一SDS体系CO2泡沫延长18 min;复合体系CO2泡沫对于附着在岩石壁面上的原油具有更为明显的“擦除”作用,这种作用与泡沫在多孔介质中的快速反复运动相结合能够进一步提高洗油效率;随着复合体系质量分数的增加,采收率增幅逐渐增加,当SiO2纳米颗粒质量分数达到1.5%时,可提高采收率30.3%;22-80℃实验温度范围内,复合体系CO2泡沫提高采收率均达到20%以上。The temperature resistance and the oil tolerance of the CO2 foam system stabilized by SiO2 nanoparticles and SDS were dis- cussed, and the oil displacement mechanism and the oil displacement capability of it were studied using simulation experiments. It is shown that when the mass fraction of SDS and SiO2 nanoparticle in the system is 0.25% and 1.5% respectively,the half life of the C02 foam system can reach to 25.3 min at 80-C ,and it is longer 23.8 min than that of the CO2 foam stabilized only by SDS. When the volume fraction of crude oil is 10% ,the half life of the CO2 foam system is longer 18.0 min than that of the CO2 foam stabilized only by SDS. The CO2 foam system has stronger ＂erasing＂ effect on the crude oil attached to the wall of a rock ,and the ＂erasing＂ effect being combined with the fast repeated movement of foam in porous media combination can further improve oil displacement efficiency. With the increase of the mass fraction of SDS and SiO2 nanoparticle in the composite CO2 foam system, the increase of recovery factor enhancees gradually, and when the mass fraction of Si02 nanoparticles reaches 1.5 % , the recovery factor can be increased by 30.3 %. In the experimental temperature range of 22 -80℃,the oil recovery factor enhanced by the composite CO2 foam system is higher than 20%.

关 键 词：SiO2纳米颗粒 CO2泡沫驱 耐温性 耐油性 驱油机理 

分 类 号：TE357[石油与天然气工程—油气田开发工程]