No.1(45),2026 PP.219-250

Neftyanaya provintsiya No. 1(45), 2026

Improvement of well acidizing efficiency in carbonate and terrigenous reservoirs

N.I. Baturin, I.G. Fattakhov
DOI: https://doi.org/10.25689/NP.2026.1.219-250

Abstract

The research performed has resulted in the development of a specific algorithm to select acid systems for well treatment operations in carbonate and terrigenous reservoirs. This analytical study is based on analyzing the effect of physical and chemical characteristics of acid systems on treatment efficiency in carbonate and terrigenous reservoirs when used for injection and production well stimulation. To enhance the efficiency of well acidizing in carbonate and terrigenous reservoirs, a new approach to selecting acid systems is considered. This approach includes determination of technical and operational parameters related to the mineralogical features of reservoirs and physical-chemical properties of oil. A number of methods and key parameters are used to develop new technologies and acid systems, as well as to adjust the existing ones to specific reservoir conditions. These methods can be classified as general and specialized. General methods include standard procedures to determine physical and chemical properties, such as appearance, density and concentration of the basic component, interfacial tension (IFT), dissolution rate of St.3 steel, and freezing point. Specialized methods are focused on studying the interaction between acids and the reservoir rock, for example, solubility of core samples or individual minerals (such as marble, quartz, etc.). These methods also involve studying interaction between acids and reservoir fluids, including compatibility with oil and formation water, as well as permeability tests using models and core samples. Solution to this problem is based on theoretical and experimental studies supported by preliminary review of domestic and foreign experience using public sources. The results of experimental studies were processed by analytical methods. This paper presents justification of the key standard parameters and their values used in technical and process requirements and conditions applied to acid systems for well acidizing operations in carbonate and terrigenous reservoirs. This includes determination of their significance, reviewing domestic and foreign research experience, description of procedures, determination of basic requirements for acid systems to ensure their efficiency during well acidizing operations in carbonate and terrigenous reservoirs, definition of key techniques and parameters to assess the efficiency of well acidizing, as well as justification of selection and significance of physical and chemical characteristics and their values.

Key words:

acid system, acidizing, wellbore zone, carbonate and terrigenous reservoirs, physical and chemical characteristics, optimum values

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Authors

N.I. Baturin, Engineer, Well stimulation and water shutoff laboratory, Well operation and workover department, TatNIPIneft Institute – PJSC Tatneft
186А Sovetskaya St., Almetyevsk, 423462, Russian Federation
E-mail: BaturinNI@tatnipi.ru

I.G. Fattakhov, DSc, Director for EOR, wave and bio-technologies, TatNIPIneft Institute – PJSC Tatneft
186A Sovetskaya St., Almetyevsk, 423462, Russian Federation
E-mail: fattakhovig@tatneft.ru

For citation:

N.I. Baturin, I.G. Fattakhov Povysheniye effektivnosti kislotnykh obrabotok priskvazhinnykh zon karbonatnykh i terrigennykh kollektorov [Improvement of well acidizing efficiency in carbonate and terrigenous reservoirs]. Neftyanaya Provintsiya, Neftyanaya Provintsiya, No. 1(45), 2026. pp. 219-250. DOI https://doi.org/10.25689/NP.2026.1.219-250. EDN ISRGEO (in Russian)

© Non-governmental organization Volga-Kama Regional Division of the Russian Academy of Natural Science, 2015-2026 All the materials of the journal are available under the Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by/4.0/)

Improvement of well acidizing efficiency in carbonate and terrigenous reservoirs N.I. Baturin, I.G. Fattakhov DOI: https://doi.org/10.25689/NP.2026.1.219-250

Key words: acid system, acidizing, wellbore zone, carbonate and terrigenous reservoirs, physical and chemical characteristics, optimum values

Improvement of well acidizing efficiency in carbonate and terrigenous reservoirs

N.I. Baturin, I.G. Fattakhov
DOI: https://doi.org/10.25689/NP.2026.1.219-250

Key words:

acid system, acidizing, wellbore zone, carbonate and terrigenous reservoirs, physical and chemical characteristics, optimum values