摘要：

采用原子吸收法测定了高矿化度压裂返排液水样中钠、钙、镁、铁、钡、铝、锰等7种金属元素的含量，通过分析Ca²⁺、Mg²⁺、Fe³⁺对疏水缔合聚合物溶解能力的影响，确定了Ca²⁺是主要因素。室内开发了能络合游离Ca²⁺的处理剂，使其形成水溶性螯合物，消除金属离子对疏水缔合聚合物溶解能力的影响。在长庆油田15口井进行了现场应用，回收处理液3 900 m³，不仅促进了水资源的循环利用，而且减少了环境污染。

关键词: 高矿化度, 疏水缔合聚合物, 返排液

Abstract:

The contents of sodium, calcium, magnesium, iron, barium, aluminum, manganese in the high salinity fracturing flowback fluid were determined by atomic absorption spectrum. From the analysis on the effect of Ca²⁺, Mg²⁺, Fe³⁺ on the solubility of hydrophobically associating polymer, it was found that Ca²⁺ was main factor. The ion treatment agent which could quickly react with calcium ions has been developed indoors to form water-soluble chelating polymers. This could largely eliminate the effects of metal ions on the solubility of hydrophobically associating polymer. This treatment agent had been applied in15 wells of Changqing Gasfield and 3 900 m³ treatment fluid had been recovered. It could not only accelerate the recycling of water resources, but also reduce environmental pollutions.

Key words: high salinity, hydrophobically associating polymer, fracturing flowback fluid

中图分类号: 

• X703

• TE4