低渗透油藏CO_(2)驱前缘移动规律及主控因素研究  

Study on CO_(2) Flooding Fronts Movement Law and Primary Control Factors in Low Permeability Reservoirs

作　　者：毛振强 高同 董平志 樊超 刘赛军 Mao Zhenqiang;Gao Tong;Dong Pingzhi;Fan Chao;Liu Saijun(Chunliang Oil Production Plant,Sinopec Shengli Oilfield,Binzhou,China)

机构地区：[1]中国石化胜利油田分公司纯梁采油厂,山东滨州

出　　处：《科学技术创新》2023年第11期47-53,共7页Scientific and Technological Innovation

摘　　要：低渗透油藏CO_(2)驱替可以大幅度提高开发效果,但是CO_(2)气窜严重,CO_(2)气水交替可以降低气窜现象。为了治理气窜,提出了混相压力前缘、组分前缘和CO_(2)相前缘的概念,建立典型井组概念模型,刻画了三个前缘的运行特征和影响因素。研究表明,随着注入井的不断注入,三个前缘的半径都在逐渐的扩大,但混相压力前缘相比于气相前缘和组分前缘传播速度更快。影响前缘的主要敏感因素有地层渗透率、注入速度、压力保持水平等参数,其中压力前缘主要受到地层渗透率和流体物性影响,组分前缘主要受到扩散系数水平影响,相前缘主要受到注入速度影响。该研究对低渗透油藏CO_(2)驱油的高效开发提供了一定的技术指导。CO_(2)flooding is an innovative technique with significant potential to improve reservoir performance in low permeability reservoirs.However,the CO_(2)flooding suffers from severe gas channeling,which can be effectively mitigated and suppressed by alternating gas-water mode.In order to govern gas channeling,three fronts are invented,corresponding to the minimum miscibility pressure front,CO_(2)component front,CO_(2)phase front,respectively.A typical well group model is established by a commercial simulator to sketch the movement characteristics and influencing factors of the three fronts.Research indicates that the radii of all three fronts are gradually spreading as the injection wells are continuously injected,but the minimum miscibility pressure front is spreading faster than the gas-phase front and component fronts.The major sensitive factors affecting the front are parameters such as formation permeability,injection rate,and pressure maintaining level,among which the pressure front is principally influenced by formation permeability and fluid properties,the component front is principally influenced by diffusion coefficient level,and the phase front edge is principally influenced by injection rate.This investigation provides a certain technical guidance for the efficient development of CO_(2)flooding in low permeability reservoirs.

关 键 词：CO_(2)驱 数值模拟 气水交替驱 驱替前缘 

分 类 号：TE357.45[石油与天然气工程—油气田开发工程]