| 摘要: |
| 针对Fe3+会减弱VES自转向酸酸化效果的问题,基于三种VES自转向酸体系与Fe3+配伍性实验,运用流变性测试、HPLC–CLND、ICP和XPS等方法,进一步了解了Fe3+与表面活性剂作用机理。实验结果表明,随着Fe3+质量浓度增加,VES体系黏度呈先增后降趋势,反应越来越剧烈,Fe3+和VES质量浓度大幅降低,且当Fe3+质量浓度大于4 000 mg/L时,体系会出现非混相状态。XPS结果表明,VES与[FeCl4]-形成螯合物沉淀,使体系黏度下降,酸化效果减弱。实验结果为VES表面活性剂合成与复配优选提供了依据。 |
| 关键词: 酸化 黏弹性表面活性剂 自转向酸 Fe3+ |
| DOI：10.3969/j.issn.1007-3426.2017.04.013 |
| 分类号: |
| 基金项目: |
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| Impact of Fe3+ on the performance of VES used in self-diverting acid |
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Gao Xiang1, Xu Yongnan2, Sun Shixuan3, Wang Ying1, Deng Sen1
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1. The 7th Oil Production Plant, PetroChina Daqing Oilfield Company, Daqing, Heilongjiang, China;2. The 3rd Oil Production Plant, PetroChina Daqing Oilfield Company, Daqing, Heilongjiang, China;3. CNPC CMB Company, Taiyuan, Shanxi, China
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| Abstract: |
| The Fe3+ can weaken acidizing effect of VES self-diverting acid. This paper studied compatibility between Fe3+ and three kinds of VES self-diverting acids and further studied action mechanism between Fe3+ and surface active agent by analysis of rheology, HPLC-CLND, ICP, and XPS. The results showed the viscosity of VES increased at first and decreased later with the increase of Fe3+ concentration. The reaction was become stronger and stronger with the increase of Fe3+ concentration. When the concentration of Fe3+ was up to 4 000 mg/L, the system became immiscible phase. XPS results showed that VES and [FeCl4]- formed chelate precipitates, which reduced the viscosity of the system and weakened the acidizing effect. The experimental results provide the basis for the synthesis and compound optimization of VES surfactants. |
| Key words: acidizing viscoelastic surfactant self-diverting acid oilfield chemistry |
