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2019/4
Development of thermostable dry acid composition based on sulfamic acid
Chemical sciences

Authors: Lyubov A. MAGADOVA graduated from Gubkin Moscow Institute of Petrochemical and Gas Industry in 1975. She is Doctor of Technical Sciences. Professor of the Department of Chemical Reagents for Oil and Gas Industry from Gubkin Russian State University of Oil and Gas (National Research University). She is specialist in the field of oilfield chemistry, reagents and technologies for hydrocarbons recovery processes. She is author of more than 180 scientific publications. E-mail: lubmag@gmail.com
Mikhail D. PAKHOMOV graduated from Gubkin Moscow Institute of Petrochemical and Gas Industry in 1976. He is Head of the Surfactant and Acid Systems Division at the Research and Educational Center “Oilfield Chemistry”. He is specialist in the field of acid treatment, applications of surfactants. He is author of more than 40 scientific publications. E-mail: pahomov.m.d@mail.ru
Timur I. YUNUSOV graduated from Gubkin Russian State University of Oil and Gas (National Research University) in 2018. He is Engineer of the Surfactant and Acid Systems Division at the Research and Educational Center “Oilfield Chemistry”. E-mail: timyun96@gmail.com
Vadim A. TSYGANKOV graduated from Gubkin Russian State University of Oil and Gas in 2006. He is Candidate of Technical Sciences, Associate professor of the Department of Chemical Reagents for Oil and Gas Industry from Gubkin Russian State University of the Oil and Gas (National Research University). He is specialist in the field of oilfield chemistry, technologies and reagents for well stimulation, in particular, acid treatment technologies. He is author of more than 40 scientific publications. E-mail: tsygankov.v@gubkin.ru

Abstract: This article is dedicated to the development of the dry acid composition based on sulfamic acid for well bottomhole zone acid treatment after injection profile flattening treatment. The main disadvantage of the compositions of this kind is complications occurring at temperatures higher than 60oC due to intense hydrolysis of sulfamic acid. The presented results showed that this disadvantage could be eliminated. Thermal stability is attributed to sulfamic acid by addition of specific modifiers that shift the equilibrium of sulfamic acid hydrolysis to the original agents. The developed composition is workable, meets industrial standards and may be recommended for use during the injectivity profile flatte- ning treatment.

Index UDK: 622.276.63

Keywords: acid treatment, sulfamic acid, hydrolysis, dry acid composition, amho-lytic surfactant

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