Volume 35 Issue 3
May  2018
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LIU Guoliang, SU Huimin, LU Yongjun, ZHANG Fusheng. The Detection of Bromide Tracer in Hydraulic Fracturing Flowback[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(3): 119-123. doi: 10.3969/j.issn.1001-5620.2018.03.021
Citation: LIU Guoliang, SU Huimin, LU Yongjun, ZHANG Fusheng. The Detection of Bromide Tracer in Hydraulic Fracturing Flowback[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(3): 119-123. doi: 10.3969/j.issn.1001-5620.2018.03.021

The Detection of Bromide Tracer in Hydraulic Fracturing Flowback

doi: 10.3969/j.issn.1001-5620.2018.03.021
  • Received Date: 2017-11-22
  • Publish Date: 2018-05-30
  • With increasing scale in reservoir fracturing, more rigorous requirement has been placed on chemical tracers and their detection whose sensitivity and accuracy are both affected by the addition of fracturing fluid additives. In laboratory studies, two simulated fracturing fluid samples formulated with HPGG and HPAM respectively, were detected for the bromide ions using phenol red spectrophotometry method, and the factors affecting the detection were also studied. Key factors affecting the detection, such as amount of phenol red and chloramine T, and time for the oxidation reaction were optimized based on the analysis of the measurement principles of the phenol red spectrophotometry. It is pointed out in the paper that for the bromide ions to be detected, it is critical that at pH between 4.7-5.7 (acidic), the equivalent number of phenol red should be greater than that of chloramine T, whose equivalent number should in turn be greater than that of the bromide ions. Working curves were calculated for the detection of bromide ions in two hydraulic fracturing flowback fluids with the phenol red spectrophotometry. Using the two working curves, concentrations of bromides up to 2-20 mg/L can be detected with linearly dependent coefficient not less than 99%. When detecting the bromide ions, the fracturing flowback fluids should first be filtered, ensuring that the operational conditions for the standard working curve of bromide ions are in agreement with the operational conditions under which the samples are detected, thereby to eliminate the effects of other complex components that may exist in the fracturing flowback fluids. This detection method is instructive in promoting the use of bromide tracers in fracturing fluids.

     

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