一种耐盐耐甲醇耐凝析油泡排剂的室内研究

Development of a Gas Well Foam Agent with Salt Resistance,Methanol Tolerance and Condensate Oil Resistance Ability

在天然气开采中后期,通常采用泡沫排水采气工艺来清除井底积液,但井筒积液具有较高矿化度,有时含有甲醇、凝析油等,都会影响泡排剂的性能。为了复配出性能更优的泡排剂,以6种常用的泡排剂为主剂,通过评价分析,优选2种泡排剂,确定最佳配比与浓度后,加入3种助剂,增加起泡高度以及半衰期,以改善泡排剂的起泡性能与稳定性能,最后对所复配出的泡排剂进行各项敏感性分析。最终,证明了所复配出的混合型泡排剂具有很好的耐盐性、耐温性、抗甲醇性以及抗凝析油性。

The process of foam drainage gas recovery is usually used to remove effusion at bottom in the middle and later periods of the gas recovery.However wellbore fluid with high salinity,sometimes containing methanol and condensate,will affect the foam agent performance.In order to compound better foam agent,a series of measures have been taken in this article.Firstly,two foam agents is selected from six main foam agents and the best proportion and concentration is determined by evaluation and analysis.Secondly,in order to improve the foaming performance and stability performance of the foam agents,three kinds of additives are joined to increase the foam height and half-life.Thirdly,sensitivity analysis is performed for the compounded foam agent.Finally it is proved in this that the compounded foam agent has excellent salt resistance,temperature tolerance,methanol resistance and resistance to condensate oil.