Developments in recent years allow chemical experiments that have traditionally been performed in the laboratory to be carried out on small chip-type instruments. This miniaturization of flow and chemical reactions in microchannels is called microfluidics. Only small quantities (i.e. microlitres) of reagent are necessary to perform these tests fast, reliably and cost effectively.

This paper outlines the basics of microfluidics, describing what it is and how it works as a tool for chemical analysis applied to drilling- and production chemistry. The focus is for applications as a measurement tool for the concentrations of ions, scaling ions and scale inhibitors. Results of measurements of chloride concentrations, zinc content, total ion content and calcium concentrations and scaling are discussed. The advantage of a microfluidic test of scaling is discussed using a field example, where unexpected reactions between unspent acids and completion brine were observed in the well and also in microfluidic devices.

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