The use of squeeze treatments to deploy scale inhibitors requires accurate determination of inhibitor concentrations in the returned fluids. This information is used, in conjunction with water chemistry and production data, to determine when to re-squeeze a well. In addition, with tightening environmental legislation becoming more probable, the concentration of production chemicals (including scale inhibitors) which are disposed of in produced waters need to be closely monitored. Current analysis techniques, especially for polymers, have proved problematic in field situations. Two spectrophotometric methods have been modified to analyse for polyacrylic acid, polyvinylsulphonic acid and phosphinopolycarboxylic acid scale inhibitors. The improved techniques have been tested in real oilfield brines and are simple, rapid, reliable and sensitive at the low concentrations found in oilfield situations.

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