The effectiveness of the bottom-hole treatment directly depends on the acid composition, which is selected on the assumption of both reservoir and composition characteristics. Nowadays modified acid compositions, including
emulsions, are actively used along with traditional acid compositions. Acid hydrocarbon-containing emulsions have a number of advantages, promoting the increase of the effectiveness of acid treatment. This paper presents the
results of a study of the main technological characteristics of hydrochloric acid compositions of different types and their comparative assessment.
Materials and methods
Different methods and laboratory equipment were used during the study of the properties of acid compositions. Viscosity of the compositions was determined using the Anton Paar rheometer, dispersed properties were detected using the digital microscope Altami and the software for digital data processing. The technological properties of the compositions were identified using the guidelines of the “Rosneft” PJSC. Ability of the compositions to dissolve asphalt-resin-paraffin deposits was investigated using the static basket method with the paraffin type asphalt-resin-paraffin deposits. Corrosiveness of the compositions was defined immersing the steel plates into them with the further evaluation of the weight loss of plates. Compatibility of the compositions with oil was evaluated mixing them with the sample of the high viscosity oil-water emulsion and filtering the mixture through a 100 mesh sieve. Reaction rate of the acid compositions with the carbonate rock was identified immersing the marble cubes into them with the further evaluation of the dissolution rate based on the weight loss of the marble.
hydrochloric acid composition, oil-in-water emulsions, water-in-oil emulsions, technological properties, corrosiveness, solvent power, compatibility with oil, reaction rate with the marble