摘要
随着我国油气勘探逐渐向纵深探索,凝析气藏的开采已成为推动"非常规油气革命"的重要部分之一。如何通过正确的方式进行反凝析伤害评价,进而对其进行解除,已成为各大凝析气藏亟待处理的问题。本文针对吉林油田凝析气藏反凝析伤害情况开展实验研究,依据吉林油田不同渗透率级别的现场岩心,进行反凝析损害程度室内评价;选择注CO2焖井方式进行伤害解除实验,对比不同焖井时间渗透率恢复效果。实验结果表明:吉林油田不同渗透率岩心均受到中等程度的反凝析伤害,而采用注CO2焖井对于反凝析伤害有良好的解除效果,渗透率伤害率最高可由60.04%下降到19.2%;当焖井时间为48h时,渗透率恢复效果最佳,最高可恢复为处理前的102%。
With the development of oil and gas exploration in China,the exploitation of condensate gas reservoir has become one of the important parts to promote the"unconventional oil and gas revolution".How to evaluate the damage of retrograde condensation in a correct way and then remove it has become an urgent problem to be solved.According to the field cores of different permeability levels in Jilin oilfield,the laboratory evaluation of the degree of retrograde condensate damage was carried out;and the method of CO2 injection was selected to carry out the damage relief experiment,and the permeability recovery effect of different soaking time was compared.The experimental results showed that different cores in Jilin oilfield were all suffered from moderate degree of retrograde condensate damage,while CO2 injection soak well had good relief effect for retrograde condensate damage,the highest permeability damage rate was reduced from 60.02%to 19.2%;when soaking well time was 48 h,the permeability recovery effect was the best,the highest permeability was recovered to 102%of that before treatment.
作者
张宇飞
赵法军
徐天晓
朱光猛
刘灏亮
ZHANG Yu-fei;ZHAO Fa-jun;XU Tian-xiao;ZHU Guang-meng;LIU Hao-liang(School of Petroleum Engineering,Northeast Petroleum University,Daqing 163318,China;Drilling and Production Engineering Research Institute of Yumen Oilfield,Jiuquan 735000,China)
出处
《当代化工》
CAS
2021年第1期217-220,224,共5页
Contemporary Chemical Industry
基金
“十三五”国家重大专项,稠油多介质蒸汽驱技术研究与应用(项目编号:2016ZX05012-001)
“十三五”国家重大专项,稠油火驱提高采收率技术(项目编号:2016ZX05055-006)资助
关键词
凝析气藏
反凝析伤害
焖井时间
伤害率
Condensate gas reservoir
Retrograde condensate damage
Soaking time
Damage rate
