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Issue:ISSN 1006-5539
          CN 51-1183/TE

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    Your Position ：Home->Past Journals Catalog->2016 Vol.4

    Experimental Analysis of Chelating Performance for Sandstone Acidizing Fluid Multi-Hydrogen Acid
    Author of the article:Jiang Jianfang, Gao Xiang, Wang Ying, Xu Yongnan
    Author's Workplace：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
    Key Words：Sandstone acidizing; Multi-hydrogen acid; 19F NMR; Experiment
    Abstract：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.

     


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