The dynamic production environments of the oil industry continually drive the demand for more effective scale control, while increasing environmental concerns push forward the development of environmentally friendly, preferably bio-degradable production chemicals. This constant chemical evolution presents challenges for the detection of new polymeric scale inhibitors at threshold levels in produced waters.
Scaled Solutions have well-established analysis techniques for conventional scale inhibitors via ICP and wet-chemical methods. As part of the SWELL JIP series, new analytical techniques have been developed for analysing residual scale inhibitor concentrations, providing accurate, repeatable and reliable results. These methodologies focus on automated HPLC-based, solid-phase extraction and Fluorescence based techniques, and analyse for the “active” scale inhibitor component, as opposed to other analysable moiety that can be detected by less focused techniques.
Scaled Solutions have developed a range of methods, including the use of Gel Permeation, Reversed Phase and Ion Chromatography. We utilise a number of different detection techniques including Evaporative Light Scattering (ELSD), Charged Aerosol Detector (CAD), UV/Vis and Conductivity. We have vast method development experience with automated HPLC based methods for phosphonates and other P-containing chemicals, polymers and other additives such as surfactants.
Residual scale inhibitor analysis in produced waters By Solid Phase Extraction (SPE) techniques have been developed within Scaled Solutions that demonstrate near 100% retention of polymeric species in brines of different salinities, and therefore negate the requirement for dialysis. Present advances made in the separation and assay of these and other polymeric species including the ability to obtain reliable separation and, when required, concentration using SPE methods, as well as the utility of a variety of different detection systems. Extensive validation tests in a range of high salinity brines demonstrates the limits of detection and repeatability at ppm and sub ppm level for a variety of different polymers including PVS, VS-Co and more conventional polyacrylate, as well as phosphorous containing polymers.