Volume 35 Issue 4
Jul.  2018
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MENG Liyan, HUANG Ning. Improvement of Method for Measuring Degree of Cationic Substitution of Drilling Fluid Polymers[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(4): 51-56. doi: 10.3969/j.issn.1001-5620.2018.04.009
Citation: MENG Liyan, HUANG Ning. Improvement of Method for Measuring Degree of Cationic Substitution of Drilling Fluid Polymers[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(4): 51-56. doi: 10.3969/j.issn.1001-5620.2018.04.009

Improvement of Method for Measuring Degree of Cationic Substitution of Drilling Fluid Polymers

doi: 10.3969/j.issn.1001-5620.2018.04.009
  • Received Date: 2018-02-08
  • Publish Date: 2018-07-30
  • Testing the degree of cationic substitution of quaternary ammonium salts with sodium tetraphenylborate (STB) is one of the most effective methods that have been widely used. The drawbacks of this method are that the interference of inorganic potassium ions and ammonium ions, as well as the molecular structure of the samples make the test inaccurate to some extent. Studies have been conducted on the improvement of the accuracy of the STB method by eliminating ionic interferences to the STB method, optimizing the test conditions of the STB method and investigating the effects of the molecular structure of polymers on the measurement of cationic substitution. In laboratory tests, the polymer samples were purified with 90%-95% ethanol to eliminate interference from potassium ions, ammonium ions and low molecular weight (MW) cationic monomers from outside. The mass of sample was determined to be 0.2 g, pH value for the precipitation between 3.0 and 4.0, temperature for precipitation between 15℃ and 25℃, and pH value for titration between 7.0 and 8.0. H2O2 was used at a certain temperature to reduce the MW of polymers to minimize the effects of molecular structure on the test accuracy of test, thereby improving the accuracy of the STB method. The test results show that the modified STB method has good feasibility and accuracy; the identification limit of the test is 0.1 g, and recovery rate 92%-94%.

     

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