低渗透油藏CO_2驱替过程中的混相特征实验研究  

Study on dynamic miscibility of CO_2 flooding for low permeability reservoirs

作　　者：王锐[1,2] 吕成远[1,2] 伦增珉[1,2] 赵淑霞[1,2] 潘伟义[1,2] 周宇[1,2] 

机构地区：[1]中国石油化工集团公司海相油气藏开发重点实验室,北京100083 [2]中国石化石油勘探开发研究院采收率所,北京100083

出　　处：《陕西科技大学学报（自然科学版）》2015年第3期105-108,共4页Journal of Shaanxi University of Science & Technology

基　　金：国家863科技计划项目(2009AA063406)

摘　　要：针对低渗透油藏CO2驱替过程中注采压差大导致的压力分布不均匀的问题,开展了低渗透油藏CO2驱替过程中的沿程压力分布监测实验;根据最小混相压力测定实验,计算并获得了低渗透油藏CO2驱替过程中的混相程度;基于混相程度的概念,分别进行了不同注入模式下的CO2驱油实验.研究结果表明,低渗透油藏CO2驱替过程中的沿程压力分布呈动态变化特性,随着CO2的注入,CO2驱混相程度逐步提高;不同注入模式下的混相程度不同,高压低速注入混相程度最高、驱油效果最好,低压高速注入次之,低压低速注入最差.低渗透油藏CO2驱开发,应当补充能量,尽可能提高混相程度,才能达到较好的驱油效果.In the view of uneven pressure distribution in CO2 flooding for low permeability reservoirs, the monitoring test for the pressure distribution along the long core sample in CO2 flooding was carried out. The miscibility of CO2 flooding for low permeability reservoirs was calculated and acquired according to the MMP value measured by the slim tube test. And the injection mode of CO2 flooding was optimized through the miscibility. The results show that the pressure distribution of CO2 flooding for low permeability reservoirs characterizes to be dynamic. The miscibility extent of CO2 flooding gradually increases with increase of CO2 injection. The injection mode at high pressure and injection rate acquires high miscibility and high displacement efficiency. And the injection mode at low pressure and high injection rate takes the second. The injection mode at low pressure and low injection rate takes the worst. Consequently, it CO2 injection for low complement formation energy and increase reservoir pressure before permeability reservoirs.

关 键 词：低渗透 CO2驱 混相程度 沿程压力分布 注入模式 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]