NACE TM0374

Abstract

Scope: The test methods described in this standard are static laboratory screening tests designed to measure a scale inhibitor’s ability to prevent calcium sulfate and calcium carbonate precipitation from solution at 71 °C (160 °F). These test methods are recommended only for ranking the performance of different scale inhibitors under laboratory conditions set by these methods. They are not intended to provide actual field treating rates. Many factors, such as reaction kinetics, solution chemistry, fluid velocity, temperature, pressure, scale adherence, and solids dispersion can affect scale deposition under field conditions. These factors are outside the scope of this standard. Field conditions, field brine composition, and other variables noted above should be considered at some point in scale inhibitor evaluation prior to final inhibitor selection and use. Tests should be conducted at multiple scale inhibitor concentrations to obtain a more complete understanding of performance under laboratory conditions set by these methods. The scale inhibitor concentration required for a field application is likely to be different from that determined under these laboratory conditions. This standard lists the necessary apparatus, reagents, and procedures for conducting these laboratory screening tests.