Justification of the development system and measures to increase the productivity of wells in the oil field of the eastern part of the Pechora sea

Articles in Press

Document Type : Saint Petersburg Mining University (SPMU) 2024

Authors

1 Petroleum department, Empress Catherine II Saint Petersburg Mining University, Saint Petersburg, Russian Federation

2 «Surgutneftegas» Public Joint Stock Company, Russian Federation

3 Department of Oil and Gas Fields Development and Exploitation, Oil and Gas Faculty, Empress Catherine II Saint Petersburg Mining University, Saint-Petersburg, Russia

Abstract

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 the 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, resulting 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 over 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.

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International Journal of Engineering

Articles in Press, Accepted Manuscript
Available Online from 07 May 2024

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