新疆石油地质

新疆石油地质 ›› 2007, Vol. 28 ›› Issue (2): 207-209.

• 油藏工程 • 上一篇    下一篇

注甲醇解除凝析气井反凝析污染的机理

石德佩1, 李相方1, 刘华1, 孙雷2   

  1. 1.中国石油大学 石油天然气工程学院, 北京 102249;
    2.西南石油大学 石油工程学院, 成都 610500
  • 收稿日期:2006-06-11 修回日期:2006-09-15 出版日期:2007-04-01 发布日期:2020-07-31
  • 作者简介:石德佩(1976-), 男, 山东莒南人, 在读博士研究生, 气田与凝析气田开发,(Tel) 010-89734978(E-mail) shidepei@sina.com.
  • 基金资助:
    国家“973”科技攻关项目, 气/液/固复杂相变及渗流理论研究(2001CB209108); 国家自然科学基金项目, 深层含水凝析气藏多相渗流理论研究(90210018)共同资助

Mechanism of Eliminating Retrograde Condensate Damage in Gas Condensate Well by Methanol Injection Process

SHI De-pei1, LI Xiang-fang1, LIU Hua1, SUN Lei2   

  1. 1. College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China;
    2. Institute of Petroleum Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
  • Received:2006-06-11 Revised:2006-09-15 Online:2007-04-01 Published:2020-07-31

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摘要： 用PR状态方程计算气相组分逸度,建立了含醇类的烃-醇体系气-液相平衡计算模型;为了描述醇类的极性,用正规溶液理论借助活度系数计算了液相组分逸度,模拟了烃-醇体系的相态变化特征,揭示了注甲醇解除凝析气井近井带反凝析污染的机理。研究表明,在实例凝析气样的原始温度和压力下,随注入凝析气体系中甲醇摩尔分数的增加,体系的露点显著降低;模拟注入不同摩尔分数甲醇的凝析气体系的等组分膨胀和定容衰竭过程,结果表明,随甲醇摩尔分数增加,等组分膨胀过程中凝析液饱和度不断降低;定容衰竭过程中的反凝析液量和凝析液粘度也明显降低;甲醇对凝析油产生有效的再蒸发作用,是一种有效的解除反凝析污染的溶剂。

关键词: 甲醇, 凝析气, 反凝析, 污染, 相平衡

Abstract: By using PR state equation, the gas compositional fugacity is calculated, and the gas-liquid equilibrium model for hydrocarbonmethanol system is developed to simulate the phase behavior of this system in order to reveal the mechanism of eliminating retrograde condensate damage near wellbore in gas condensate well by methanol injection process. The study shows that the dew point pressure of this system can be reduced with increase of injected methanol amount in gas condensate well under the real initial temperature and pressure; the condensate saturation in constant composition expanding process will be cut down and the retrograde condensate amount and condensate viscosity are obviously decreased in constant volume depletion process. It is concluded that methanol as an effective solvent for eliminating the retrograde condensate damage is of re-vaporizing effect on condensate oil.

Key words: methanol, gas condensate, retrograde condensate, damage, contamination, phase equilibrium

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