低渗透凝析气藏反凝析水锁伤害解除方法现状

低渗透凝析气藏的反凝析污染、水锁伤害对气井生产、气藏采收率等产生严重影响,因此研究解除凝析气藏近井地层反凝析、反渗吸地层伤害,提高气井产能的技术方法,具有重要的实际意义。调研了国内外文献,详细阐述了反凝析和水锁效应机理,提出了各种解除此两种伤害的方法,并提出在注气吞吐之前先注入一个有限尺寸的甲醇溶液前置段塞来解除反凝析油和水锁产生的地层堵塞,以改善注气吞吐,提高凝析气井产能的效果,该方法在现场得到了成功应用。

Development and Methods of Removing Retrograde Condensate and Water Blocking Impairment in the Low Permeability Condensate Gas Reservoir

The retrograde condensate and water blocking im pairment in the low permeability condensate gas reservoir have serious effects on the gas well production and the recovery rate. So it is significant to study the retrograde condensate, water blocking damage near the wellbore and the technical methods for improving the production. This paper investigates literatures, describes the mechanisms of the retrograde condensate and water blocking, also puts forwards different methods to remove the damages, further raises a new method: Inject a limited plug of methanol solution to remove the formation clogging caused by the retrograde condensate and water blocking to improve the effects of huff and puff This treatment has been applied successfully on site.