砂岩酸化用多氢酸体系螯合性实验分析
Experimental Analysis of Chelating Performance for Sandstone Acidizing Fluid Multi-Hydrogen Acid
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- 引用格式:
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蒋建方,高翔,王瑛,许永楠.砂岩酸化用多氢酸体系螯合性实验分析[J].天然气与石油,2016,34(4):0.doi:
Jiang Jianfang, Gao Xiang, Wang Ying, Xu Yongnan.Experimental Analysis of Chelating Performance for Sandstone Acidizing Fluid Multi-Hydrogen Acid[J].Natural Gas and Oil,2016,34(4):0.doi:
- DOI:
- 作者:
- 蒋建方1 高 翔2 王 瑛2 许永楠3
Jiang Jianfang, Gao Xiang, Wang Ying, Xu Yongnan
- 作者单位:
- 1.中国石油大学(北京)提高采收率研究院,2.大庆油田第七采油厂,3.大庆油田第三采油厂
1. Institute of Enhanced Oil Recovery, CUPB;2.Daqing Oilfield Development Company Ltd., Production Factory 7 ; 3.Daqing Oilfield Development Company Ltd., Production Factory 3
- 关键词:
- 砂岩酸化;多氢酸;19F核磁共振;实验
Sandstone acidizing; Multi-hydrogen acid; 19F NMR; Experiment
- 摘要:
- 为了进一步研究多氢酸与砂岩矿物的反应特性，分析多氢酸体系的螯合性，在用X射线X-ray)衍射仪分析长庆油田长3、长8储层岩心矿物含量的基础上,通过长岩心酸化流动仪进行岩心酸化流动模拟实验,使用电感耦合等离子体质谱仪(ICP)和核磁共振(19F NMR)技术分析多氢酸螯合性。ICP实验结果表明,多氢酸在实验条件下具有良好的螯合性,随着酸液浓度的增加,多氢酸的螯合性加强,但当浓度增加到6 以后,其螯合性加强不明显;多氢酸的螯合性会随着反应温度和酸液注入速率的增加而下降,且温度大于150 ℃后酸液不能起到良好的螯合作用。19F NMR结果显示废液样共检测出3组吸收峰(-167.6~-163.6、-155.7~-154.7和-146.4),表明多氢酸与砂岩矿物反应生成了氟铝酸盐(AlF(3-x)+x)系列化合物,抑制二次沉淀AlF3的生成。实验结果可以为多氢酸的应用推广提供依据。
To further study the reation characteristics between multi-hydrogen acid and sandstone mineral, on the basis of analysis to mineral composites of Chang 3 and 8 formation from Daqing oilfield by X-ray, acidizing flow simulation experiments was conducted by long cores acidizing flow device. ICP and 19F NMR technique was used to analyze the chelating performance of multi-hydrogen acid. The ICP experiment demonstrated that under the condition of experiment multi-hydrogen acid has an excellent chelating performance. With the increasing of acid concentration, the chelating performance of multi-hydrogen acid will be strengthened and when the increasing of acid concentration is over 6%, the strengthening effect of chelating is not as obvious as before. The chelating performance of multi-hydrogen acid will be decreased with the increasing of reaction temperature and acid injection rate. When temperature is beyond 150 °C , chelating performance is deeply decreased. The results of the 19F NMR showed that 3 groups of absorption peak were detected ( -167.6～-163.6, -155.7～-154.7 and-146.4) , which indicated that fluoaluminate (AlFx(3-x)+) be formed during the chemical reaction between multi-hydrogen acid and sandstone minerals and restrained the formation of AlF3. The results can serve as basis for the application of multi-hydrogen acid.
