低渗透油藏二氧化碳驱油防窜实验研究  

Experimental Study on Anti-channeling during CO_2 Flooding for Low Permeability Reservoirs

作　　者：高树生[1,2] 胡志明 侯吉瑞[1] 熊伟 

机构地区：[1]中国石油大学,北京102249 [2]中油勘探开发研究院廊坊分院,河北廊坊065007

出　　处：《特种油气藏》2013年第6期105-108,147,共4页Special Oil & Gas Reservoirs

基　　金：国家"973"项目"提高石油采收率的资源化利用及地下埋存研究"的部分研究成果(2006CB705800)

摘　　要：低渗透油藏注CO2驱油技术优势明显,一是注气阻力远小于注水阻力;二是CO2可有效提高驱油效率,但也存在一定的局限性,其中气窜是影响CO2驱采收率的重要因素。针对低渗油藏CO2驱油气窜问题,提出了将石灰水作为防窜剂注入储层,利用石灰水与CO2的化学反应实现CO2气体在储层纵向剖面的均匀推进,解决气窜问题。运用核磁共振技术和岩心驱替模拟实验,研究了CO2气窜的主要机理,对比评价了CO2驱油过程中石灰水的防窜效果。结果表明:石灰水可以有效防止或延缓气窜,改善CO2驱油效果,对于低渗油藏注CO2驱油高效开发具有重要指导意义。CO2 flooding is an extremely advantageous process for low permeability reservoir. On the one hand,the resistance in gas injection is much less than that in water injection. On the other hand,CO2 flooding can effectively improve oil displacement efficiency. But there are some limitations. For example,gas channeling is an important factor affecting oil recovery of CO2 flooding. To address the gas channeling in CO2 flooding in low permeability reservoir,the paper provides limewater as an anti-channeling additive injected into the reservoir. Limewater reacts with CO2 to drive the gas to migrate along the reservoir longitudinal section. Thus,the problem of gas channeling is solved. NMR techniques and core displacement test are used to analyze the main mechanism of CO2 channeling. The anti-channeling effect of limewater during CO2 flooding is evaluated. Results show that limewater can effectively prevent or delay the gas channeling, and improve CO2 flooding effect. CO2 flooding plays a guiding role in efficient development of low permeability reservoir.

关 键 词：低渗透油藏 CO2驱油 气窜 石灰水 防窜剂 

分 类 号：TE348[石油与天然气工程—油气田开发工程]