复合体系在超低界面张力状态下对采收率的贡献程度  

Contributions of combination flooding systems to oil recovery in an ultra-low interfacial tension state

作　　者：尚丹森 侯吉瑞[1,2,3] SHANG Dansen;HOU Jirui(Institute of Enhanced Oil Recovery, China University ofPetroleum-Beijing, Beijing 102249, China;Basic Theory Laboratory of Enhanced Oil Recovery in Low Permeability Oilfields, Key Laboratory of Tertiary Oil Recovery PetroChina, Beijing 102249, China;PetroChina Research Institute of Petroleum Exploration ＆ Development, Beijing 100083, China)

机构地区：[1]中国石油大学(北京)提高采收率研究院,北京102249 [2]中石油三次采油重点实验室低渗油田提高采收率应用基础理论研究室,北京102249 [3]石油工程教育部重点实验室,北京100083

出　　处：《石油科学通报》2018年第1期106-112,共7页Petroleum Science Bulletin

基　　金：国家科技重大专项"油田开采后期提高采收率技术(2011ZX05009-004);国家示范工程"大庆长垣特高含水油田提高采收率示范工程(2011ZX05052-006)";国家自然科学基金项目"ASP复合驱油藏油水界面张力变化规律及残余油启动机制研究(NO.51174216)"联合资助

摘　　要：为研究超低界面张力状态在地层中的有效作用距离及其对采收率的贡献,本研究用大庆天然油砂制作了10 m长填砂管物理模型,对ASP三元和SP二元复合体系在地层中的运移情况进行模拟。结果表明,水驱过后,剩余油分布呈阶梯形变化,大部分剩余油集中在模型后半段(4 m以后)。超低界面张力有效作用距离仅为2.5~3.5 m,且作用在剩余油较少的区域,对采收率的贡献程度为30%~40%。SP二元和ASP三元复合驱在10^(-3)、10^(-2)、10^(-1)、10~0 mN/m数量级界面张力下对采收率的贡献程度分别为33%、33%、20%、14%左右和39%、35%、18%、8%左右。碱能延长超低界面张力有效作用距离,增加其对采收率的贡献程度,提高10^(-2) mN/m数量级界面张力的驱油效率。复合体系在10^(-2) mN/m数量级界面张力下对采收率的贡献与超低界面张力时基本相当。To investigate the contribution of an ultra-low IFT state to oil recovery, a 10 m sand-packed physical model was built with Daqing natural oil sand and studies on the migration of alkaline surfactant polymer（ASP） and surfactant polymer（SP） in stratum were carried out in this model. The results shown that the distribution of remaining oil presented a ladder type change after water flooding, and most of the remaining oil was concentrated after 40% of the model length. The ultra-low interfacial tension state could only be maintained for 25%~35% of the model length, and played a role in the area where remaining oil was comparatively less, and its contribution to oil recovery is 30%~40%. In SP flooding and ASP flooding, contribution of 10-3, 10-2, 10-1 and 100 m N/m order of magnitude to oil recovery were 33%, 33%, 20%, 14% and 39%, 35%, 18%, 8% respectively. Alkali could prolong the effective action distance of the ultra-low interfacial tension state, increase its contribution to oil recovery, and improve the displacement efficiency of interfacial tension at a 10-2 m N/m order of magnitude. The contribution of interfacial tension state at a 10-2 m N/m magnitude to oil recovery is almost the same as that of the ultra-low interfacial tension state, and the properties of the composite system under non-ultra-low interfacial tension should also be considered. The results could provide an experimental reference for the design and optimization of combination flooding.

关 键 词：复合体系 超低界面张力 有效作用距离 提高采收率 

分 类 号：TE327[石油与天然气工程—油气田开发工程]