Selection of optimal flow parameters of acid composition for carbonate reservoirs based on coreflood experiments

UDK: 622.276.63

DOI: 10.24887/0028-2448-2025-10-49-53

Key words: coreflood experiments, acid composition, optimal flow parameters, permeability, time to breakthrough, pore volumes, wormhole

Authors: А.Yu. Dmitrieva (TatNIPIneft, RF, Almetyevsk); D.I. Ganiev (Almetyevsk State Technological University «Petroleum Higher School», RF, Almetyevsk); А.V. Nasubyllin (Almetyevsk State Technological University «Petroleum Higher School», RF, Almetyevsk); E.M. Abusalimov (TATNEFT PJSC, RF, Almetyevsk); А.А. Lutfullin (TATNEFT PJSC, RF, Almetyevsk)

The importance of research on selection of optimal acid treatments is related to the need for improved efficiency of oil and gas production stimulation in carbonate reservoirs. Mineralogy heterogeneity of such formations has a strong effect on dissolution mechanism, wormholes formation, and ultimate modification of reservoir properties; therefore, conducting laboratory coreflood tests enables to develop practical recommendations for field conditions. This paper presents the results of coreflood tests to select the optimal flow conditions of acid composition in carbonate reservoirs. Within the scope of coreflood experiments, pressure drop across the core was measured, permeabilities before and after acid treatment were estimated, the time required for a wormhole to break through the core was determined. For each research target, four injected pore volumes were obtained before breakthrough of acid composition with formation of highly conductive wormhole, corresponding to different desired injection rates of acid composition. Results of coreflood experiments were interpreted, model constants for acid composition in each target were estimated. It was found that the relationship between carbonate reservoirs mineralogy and the Damköhler number (Da) is not direct, but rather is established through the impact of mineralogy on reaction kinetics, which in turn determines the dynamics of channel (wormhole) formation during acid treatment. Relationship between Da and dissolution mechanisms was also established which, in future, would provide practical recommendations for design of acid treatment technology in terms of selection of optimal injection rates and composition.

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