Volume 42 Issue 4
Jul.  2025
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HUANG Liping, SUN Lin, ZHOU Jiyong, et al.Study on and application of calcium fluoride precipitation inhibitor for acid jobs[J]. Drilling Fluid & Completion Fluid，2025, 42（4）：560-566 doi: 10.12358/j.issn.1001-5620.2025.04.017
Citation: HUANG Liping, SUN Lin, ZHOU Jiyong, et al.Study on and application of calcium fluoride precipitation inhibitor for acid jobs[J]. Drilling Fluid & Completion Fluid，2025, 42（4）：560-566 doi: 10.12358/j.issn.1001-5620.2025.04.017
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Study on and Application of Calcium Fluoride Precipitation Inhibitor for Acid Jobs

doi: 10.12358/j.issn.1001-5620.2025.04.017

  • CNOOC Ener Tech-Drilling & Production Co., Tianjin 300452

  • Received Date: 2024-12-26
  • Accepted Date: 2025-01-12
  • Rev Recd Date: 2025-01-10
  • Publish Date: 2025-07-31
    Abstract
  • In offshore well stimulation, the secondary precipitation of calcium fluoride (CaF2) generally results in poor acid job quality, and methods for evaluating the quality of inhibitors for secondary precipitation of CaF2 cannot produce stable and reliable results. To deal with this problem, several strong acids were tested for their performance in dissolving the secondary precipitate of CaF2, and the particle size characteristics of the CaF2 generated during acid operation was analyzed. Based on the test results and the analysis, an experimental method of selecting and evaluating CaF2 precipitation inhibitors was established, and a CaF2 precipitation inhibitor BYZ-01 was developed and selected. Field experimental results show that at a concentration of 4%, there is no CaF2 precipitation in mud acid solution, demonstrating that BYZ-01 has remarkable field application effect. The understanding of the characteristics of the CaF2 secondary precipitates generated in acid job and the establishment of the method for evaluating CaF2 precipitation inhibitors for acid job have a significant importance to guiding the study on the inhibition of secondary CaF2 precipitation in acid job and the establishment of new methods for evaluating precipitation inhibitors.

     

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