溶解气驱油藏提高采收率方法实验  

Laboratory evaluation of further enhanced oil recovery in dissolved gas flooding reservoir

作　　者：刘杨[1] 

机构地区：[1]大庆油田有限责任公司第二采油厂,黑龙江大庆163414

出　　处：《大庆石油学院学报》2008年第2期32-35,共4页Journal of Daqing Petroleum Institute

基　　金：中国石油天然气集团公司科技攻关项目(020102-2-2)

摘　　要：溶解气驱的采收率一般为5%～25%,溶解气驱后还有大量原油残留地下,利用室内高压物性和现代物理模拟实验方法,评价印度尼西亚某溶解气驱油藏进一步提高采收率技术措施的应用效果.研究结果表明,在均质模型上,溶解气驱采收率为21.2%,溶解气驱后,气驱可以进一步提高采收率29.4%,水驱为33.2%,聚合物驱为42.5%.在非均质模型上,溶解气驱平均采收率为14.7%,溶解气驱后,气驱可以进一步提高采收率24.0%,水驱为22.5%,聚合物驱为41.9%.聚合物驱后,通过降低回压还可以步提高采收率6%～10%.由此可见,溶解气驱后采用气驱、水驱、聚合物驱或降低井底流压,能够较大幅度地提高采收率,是溶解气驱油藏进一步提高采收率的有效技术措施.Dissolved gas flooding is a development stage depending on the formation's energy in the reservoir.The practice of reservoir development shows that the recovery of dissolved gas flooding is generally 5%～25%,a lot of crude oil still remains in the stratum after dissolved gas flooding.Therefore,other measures must be adopted to further enhanced oil recovery.The author uses PVT and modern physical simulated experimental method to assess the applied effectiveness of the further enhancing recovery technique in one dissolved gas-flooding reservoir in Indonesia.The research results show that,for homogeneous model,the recovery of dissolved gas flooding is 21.2%,after it,the recovery that can be further enhanced is 29.4% by gas flooding and is 33.2% by water flooding and is 42.5% by polymer flooding.For heterogeneous model,the average recovery of dissolved gas flooding is 14.7%,after it,the recovery that can be further enhanced is 24.0% by gas flooding,is 22.5% by water flooding and is 41.9% by polymer flooding.The experimental results also show that the recovery can be further enhanced by 6%～10% through declining back pressure after polymer flooding.We can see from what mentioned above,gas flooding,water flooding,polymer flooding and declining flow pressure all can enhance recovery to a great degree,they are effective measures to further enhance recovery in dissolved gas flooding reservoir.

关 键 词：溶解气驱油藏 气驱 水驱 聚合物驱 物理模拟 

分 类 号：TE357.42[石油与天然气工程—油气田开发工程]