摘要
高浅北区稠油油藏平均地层温度65℃,原油地下黏度90.34 m Pa·s,已经历多次调剖调驱,含水已达97%。为了寻找提高采收率接替技术,进行了空气泡沫驱室内实验研究。微观模型驱油实验表明,泡沫驱的主要机理是封堵和乳化作用。在静态空气氧化实验中,该油藏原油可在模拟油藏条件下缓慢氧化,氧化速率为(2.261×10-5~2.448×10-5mol O2·h-1·[m L(oil)]-1,随压力、温度升高而增大。在物理模拟驱油实验中,在水驱采收率12.35%的基础上,依次进行的空气驱、空气泡沫驱、后续水驱、后续空气驱分别提高采收率36.47%、14.12%、11.18%、0;驱替过程中产出气中CO2和O2含量变化指明原油发生了氧化;注入压力变化指明空气泡沫的封堵作用。对于高浅北区稠油油藏,空气泡沫驱是可行的。
In the titled reservoir of average stratum temperature 65℃ and oil in place viscosity 90.34 m Pa·s, a series of profiling and/or flooding operations were performed and led to a water cut of 97%. To seek for ways of further oil recovery, a laboratory experimental study on air foam flooding was made. The microscopic simulating experiment demonstrated that plugging/blocking and emulsifying mechanisms were involved in oil displacement. In static oxidation experiment, it was found that the oil could be oxidized slowly under simulated reservoir conditions with an oxidation rate of(2.261×10-5—2.448×10-5mol O·h2-1·[m L(oil)]-1determined, which increased with raising pressure and temperature. In the physical modeling experiment on sandpacks, air, air foam, water, and air again were injected successively after an initial water injection, which stopped at 12.35% oil recovery obtained, and an enhancement in oil recovery of 36.47%, 14.12%, 11.18%, and 0%, respectively, was observed; the changes in CO2 and O2contents in the produced gas mixture indicated oxidation of experimental viscous oil and the variation in injecting pressure indicated plugging/blocking effect of the air foam. For the titled reservoir, air foam flood seems to be a practical method of EOR.
出处
《油田化学》
CAS
CSCD
北大核心
2014年第4期527-530,共4页
Oilfield Chemistry
关键词
稠油
超高含水油藏
空气泡沫驱
驱油机理
低温氧化
提高采收率
viscous oil
ultra high water cut reservoir
air foam flood
oil displacing mechanisms
low temperature oxidation
enhanced oil recovery(EOR)