Abstract
Abstract Acid in diesel emulsified acids have been used in the oilfield for many years. Unlike other acid systems, such as gelled and viscoelastic surfactant-based (VES) acids, where the mobility of hydrogen ion controls the overall rate of the reaction, emulsified acid/rock reaction involves the transport of acid droplets in the diesel phase to the rock surface. Upon contact with rock surface, acid droplets breaks and then the actual reaction on the surface occurs. The emulsified acid has several advantages including the minimum number of acid additives and low corrosion rate. The most important properties of emulsified acid are the viscosity, stability and reactivity. These properties are greatly affected by acid droplet size. Based on our knowledge, the effect of the droplet size on the elastic properties of emulsified acid was not studied before. The main objective of this paper is to provide a detailed description of the elastic properties of the emulsified acid. In order to perform that, a HPHT rheometer was used. The oscillatory shear measurements were carried out on a series of emulsified acid samples. Different parameters can affect the behavior of the viscoelastic properties of the emulsified acid; such as emulsifier concentration, acid to diesel volume ratio, and acid additives. The rheological properties depend on the droplet size. At low emulsifier concentration, coarse emulsion, elastic properties were dominant only at high frequency. At high emulsifier concentration, fine emulsions, viscous properties were dominant. Acid additives that affect the droplet size will affect the rheological properties of emulsified acid.
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