Justification of Developed System Measures to Increase Productivity of Wells in Eastern Part of Pechora Sea Oil Field

This study details the enhancements to operational procedures aimed at intensifying the flow in producing horizontal wells within the oil field located in the eastern part of Pechora Sea. Situated on the Arctic shelf, this field is subject to severe weather and heavy ice conditions and is characterized by low-permeable, high-temperature carbonate reservoirs. Consequently, acid treatment is identified as the optimal method for flow stimulation. An acid composition (AC) tailored for carbonate reservoir rocks is proposed in this study. Laboratory evaluations of the AC have been conducted, resulted in the substantiation of the selected concentrations of acids and additive reagents. Dependencies of the rate and degree of dissolution of the carbonate material of the proposed AC with respect to time have been established. Additionally, it was determined how the AC’s stabilizing capacity for iron ions depends on the complexing agent concentration, and how interfacial tension at the boundary with the hydrocarbon phase varies with the surfactant type and concentration in the AC. The concentration of the corrosion inhibitor within the AC has also been determined. A methodology along with an illustrative calculation for estimating the volumes of primary acid components and additive reagents for the proposed AC under field conditions are presented. Moreover, to incorporate the results from laboratory physicochemical and filtration experiments of the AC, a methodology along with a calculation example is provided to estimate changes in the skin factor relative to the volume of acid composition injected per meter of horizontal well completion.