Measurements to retrograde condensation during the middle and late production periods of condensate gas reservoirs
-
摘要: 在衰竭开发的凝析气藏中,当井底流压低于露点压力时,储层凝析油会析出并且逐渐聚集在近井地带。凝析油的聚集一方面使得凝析气渗透率和气井产能急剧下降,另一方面使得近井地带产生反凝析污染,从而严重影响气藏的最终采收率,故解除近井地带反凝析污染对提高凝析气藏采收率尤为重要。治理反凝析污染的通常做法是注气混相抽提,通过开发实践,探索出大排量、高强度注气驱油解反凝析、单井注气吞吐突破近井地带反凝析油墙解反凝析、酸化改善近井地带储层渗流能力解反凝析等3种技术,既简单经济,又大大提升了解反凝析效果。Abstract: For depleted condensate gas reservoirs, when bottom flow pressure in condensate gas wells is below dew point pressure, condensate oil will occur and gather in the near wellbore area gradually, resulting in not only the sharp decrease of reservoir permeability and production, but also retrograde condensate pollution, which res-tricts gas reservoir recovery. As a result, it is very important to retrograde condensation pollution in the near wellbore area. Several measurements are taken to retrograde condensation. A large amount of gas can be injected with high strength to drive oil. Gas injection huff and puff in single well can break through condensate oil wall. Acidification can improve reservoir permeability. These methods are easy and cheap to carry out, and can retrograde condensation effectively.
-
[1] 刘建仪,郭平,李士伦,等.反凝析污染对凝析气井伤害的试验评价研究[J].天然气工业,2001,21(5):67-70. [2] 周小平,周丽梅.凝析气藏反凝析伤害研究[J].天然气技术,2007,1(3):60-68. [3] 钟太贤,罗凯.循环注气对凝析气藏凝析油的再蒸发作用[J].天然气工业,1997,17(6):34-37. [4] 郭平,邓垒,杨学峰,等.低渗富含凝析油凝析气藏气井干气吞吐效果评价[J].石油勘探与开发,2010,37(3):354-357. [5] 汤勇,孙雷,李士伦,等.用相平衡理论评价注气吞吐消除凝析气井反凝析污染机理[J].天然气工业,2005,25(12):83-86. [6] 汤勇,孙雷,杜志敏,等.注干气吞吐提高凝析气井产能研究[J].石油天然气学报,2006,28(5):85-103. -
计量
- 文章访问数: 807
- HTML全文浏览量: 49
- PDF下载量: 660
- 被引次数: 0
下载:
苏公网安备32021102000780号