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DETERMINING RESIDUAL FRICTION REDUCER CONCENTRATIONS FOR SUBTERRANEAN TREATMENT FLUIDS

  • US 20190119563A1
  • Filed: 05/31/2016
  • Published: 04/25/2019
  • Est. Priority Date: 05/31/2016
  • Status: Active Grant
First Claim
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1. A method comprising:

  • introducing a fluid comprising an aqueous base fluid and a friction reducer into a wellbore penetrating at least a portion of a subterranean formation at a pressure sufficient to create or enhance one or more fractures within the subterranean formation;

    recovering at least a portion of the fluid from the wellbore;

    adding a reactive agent to a sample of the portion of the fluid that has been recovered from the wellbore, wherein the reactive agent reacts with the friction reducer to form a photo-detectable compound in the sample;

    measuring a light absorbance of the sample of the fluid that has been recovered from the wellbore at a selected wavelength of light; and

    using the measured absorbance and a calibration curve for the selected wavelength of light to determine the concentration of the friction reducer in the fluid that has been recovered from the wellbore.

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