西南石油大学学报(自然科学版) ›› 2007, Vol. 29 ›› Issue (2): 37-40.DOI: 10.3863/j.issn.1000-2634.2007.02.010

• 特邀专栏 • 上一篇    下一篇

凝析气藏解除反凝析污染、提高气井产能方法

潘 毅1 孙 雷1 李士伦1 孙良田1 张庆生2   

  1. (1. “油气藏地质及开发工程”国家重点实验室·西南石油大学,四川 成都 610500; 2.中原油田分公司采油工程技术研究院)
  • 收稿日期:2007-01-04 修回日期:1900-01-01 出版日期:2007-04-20 发布日期:2007-04-20
  • 通讯作者: 潘 毅

THE METHOD SOLVING CONDENSATE BLOCK AND IMPROVING PRODUCTIVITY OF GAS CONDENSATE RESERVOIR

PAN Yi 1 SUN Lei 1 LI Shi-lun 1 et al.

  

  1. (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation·Southwest Petroleum University,Chengdu Sichuan 610500,China)
  • Received:2007-01-04 Revised:1900-01-01 Online:2007-04-20 Published:2007-04-20

摘要: 针对凝析气藏特别是低渗透凝析气藏在开发过程中,地层压力降低到露点压力以后,凝析油会析出到地层中,造成反凝析污染,使气井产能下降;有时有水锁效应,产能将进一步降低,从而对凝析油、气采收率等产生严重影响的问题,在调研了国内外文献的基础上, 探索了注甲醇段塞+N2(干气)吞吐解除反凝析、反渗吸污染,恢复气井产能方法,并设计了甲醇地层水凝析油气三相体系PVT相态测试方法和注甲醇段塞+N2(干气)吞吐解除反凝析、反渗吸实验测试及评价方法,该方法在现场得到了成功应用。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。

关键词: 凝析气藏, 反凝析污染, 水锁效应, 注气, 注甲醇

Abstract: During the exploitation of gas condensate reservoir, especially the low permeability reservoir, the condensate oil will come out when the pressure drops down to the dewpoint pressure, which will cause condensate block and decreases the well productivity, the situation will be worse if the water block exist. So there is significant value to solve these two problems. After investigating domestic and aboard literatures, authors of the paper designe a method of injecting methanol plug +N2(dry gas) puff & huff to decrease the condensate and water block to improve the well productivity. A new methanol/formation water/condensate gas system PVT phase behavior test is also carried out and injecting methanol plug +N2(dry gas) puff & huff experiment conducted, and the method is effectively applied to oil field.

Key words: gas condensate reservoir, condensate, water block, gas injection, methanol injection

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