天然气勘探与开发2025，Vol.48Issue(5)：91-100,10.DOI:10.12055/gaskk.issn.1673-3177.2025.05.009
不同凝析油含量凝析气藏储层伤害及解除实验
Experimental study on reservoir damage and its relief in condensate gas reservoirs with different condensate contents
摘要
Abstract
The phenomenon of retrograde condensation is a major factor restricting the productivity release in the late stage of condensate gas reservoir development.Condensate gas reservoirs with different condensate contents present various seepage characteristics near the wellbore during retrograde condensation.In order to accurately assess the degree of reservoir damage caused by retrograde condensation,precisely analyze the change laws of productivity,and thus identify efficient measures for eliminating the condensate blockage in pore throats,indoor core depletion experiments were conducted.The gas-phase permeability damage ratio was introduced to quantitatively characterize the degree of reservoir damage in the situation of retrograde condensation at different condensate contents.In addition,an experiment was designed to analyze the relief degree of reservoir permeability damage of condensate gas reservoirs with various condensate contents by injecting nitrogen,CO2,methanol or dry gas.The following results are obtained.(i)Higher condensate content and lower gas-oil ratio lead to more severe reservoir damage.(ii)With the continuous depletion of core pressure,the permeability damage ratio gradually increases.The most severe damage occurs when the pressure reaches the point corresponding to the maximum retrograde condensation liquid volume.Then the damage gradually decreases with further pressure reduction.(iii)Higher condensate content and lower gas-oil ratio result in better permeability recovery through medium injection.CO2 injection demonstrates strong performance in restoring permeability across multiple types of condensate gas reservoirs.It is concluded that the research results provide a valuable reference for evaluating different types of condensate gas reservoirs and selecting methods to mitigate retrograde condensation damage.关键词
凝析气藏/反凝析/储层伤害/注入介质/渗透率恢复/解堵效果Key words
Condensate gas reservoir/Retrograde condensation/Reservoir damage/Medium injection/Permeability recovery/Blockage removal effect分类
能源科技引用本文复制引用
廖恒杰,蒋哲昊,李元生..不同凝析油含量凝析气藏储层伤害及解除实验[J].天然气勘探与开发,2025,48(5):91-100,10.基金项目
中海石油(中国)有限公司科研项目"孔宝武地区弱水驱油藏提高采收率技术研究"(编号:202417716474). （中国）
