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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

Bibliography:
1. Khisamov R.S., Gazizov A.A., Gazizov A.Sh. Increase of treated formations sweep efficiency. M: OAO “VNIIOENG”, 2003, 568 p.
2. Kelland M.A. Production chemicals for the oil and gas industry. Taylor&Fransis Group, 2009, 404 p.
3. Gluschenko V.N., Silin M.A. Oilfield chemistry. Published as 5 volumes. Volume 4. Acid treatment. Edited by I.T. Mischenko. M.: Interkontakt Nauka, 2010, 703 p.
4. New guidebook for chemists and technologists. Chemical equilibrium. Solutions properties. Edited by S.N. Simanova. SPb.: ANO “NPO Professional”, 2004, 998 p.
5. Amiyan V.A., Ugolev V.S., Pankratova M.N. Temperature influence on the efficiency of well acidizing with sufamic acid. Oil industry, 1971, no. 2, p. 35-38.
6. Amiyan V.A., Ugolev V.S., Kuznetsov G.N. Results of investigation of metal corrosion in sulfamic acid solutions. Oil industry, 1969, no. 10, p. 62-65.
7. Amiyan V.A., Ugolev V.S. Physical and chemical methods of well stimulation. M.: Nedra, 1970, 280 p.
8. Silin M.A., Magadova L.A., Tsygankov V.A., Mukhin M.M., Davletshina L.F. Acid treat- ment and methods of acid compositions testing: Guidebook. M.: Gubkin University of Oil and Gas, 2011, 142 p.

2019/3
Approach to development of liquid and solid crosslinkers of aqueous polysaccharide gels for fracturing
Chemical sciences

Authors: 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
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
Kirill V. STRIZHNEV graduated from Ufa State Petroleum Technological University in 1999. He is Doctor of Technical Sciences, Head of the specialized Department of Technologies for Enhanced Oil Recovery of Hard-To-Recover Reserves from Gubkin Russian State University of Oil and Gas (National Research University). He is specialist in the field of deve-lopment and exploitation of oilfields in particular containing hard-to-recover reserves. He is author of more than 60 scientific publications. E-mail: strizhnev.k@gubkin.ru
Denis N. MALKIN graduated from Gubkin Russian State University of Oil and Gas in 2007. He is Head of Division of Chemical Reagents for Hydraulic Fracturing, Research and Educational Center “Oilfield Chemistry” from Gubkin Russian State University of Oil and Gas (National Research University). He is specialist in the field of reagents and technologies for well stimulation. He is author of more than 20 scientific publications. E-mail: malkindn@gmail.com

Abstract: The process of hydraulic fracturing is now one of the most effective methods of oil production stimulation. This has become an integral part of almost every development project. Hydraulic fracturing, however, entails a lot of difficulties and risks. A large number of parameters as well as variability of conditions should be taken into account during the preparation and implementation stage. Risks can be minimized and the quality of the processing can be improved by optimizing chemical reagent handling (transportation, storage, utilization). A special approach helps to optimize the work flow with chemical reagents when not individual chemicals are used, but compositions of chemicals of multifunctional purpose. The development of such compositions can be algorithmized and vary depending on tasks

Index UDK: 622.234.573

Keywords: hydraulic fracturing, crosslinked polysaccharide gel, crosslinking process, commercial form, dry crosslinking composition, granulated crosslinker, li- quid crosslinking composition, liquid crosslinker

Bibliography:
1. Magadova L.A., Silin M.A., Malkin D.N., Tsygankov V.A., Savasteev V.G. New reagents for the hydraulic fracturing. Coiled Tubing Times, 2013, no. 2, p. 64-69.
2. Strizhnev K.V., Tsygankov V.A., Magadova L.A., Kunakova A.M., Duplyakov V.M. Hydraulic fracturing water-based polysaccharide gel crosslinking process analysis. Technologies of oil and gas, 2018, no. 4, p. 38-43.
3. Strizhnev K.V., Tsygankov V.A., Magadova L.A., Kunakova A.M., Gogolev A.A. Solid crosslinker of aqueous polysaccharide gel. Chemistry and Technology of Fuels and Oils, 2018, no. 4, p. 13-15.