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2020/1
Development of viscoelastic composition based on surfactants for hydraulic fracturing
Chemical sciences

Authors: Denis N. MALKIN graduated from Gubkin Russian State University of Oil and Gas in 2007. He is assistant lecturer at the Department of Chemical Technology for Oil and Gas Industry of Gubkin Russian State University of Oil and Gas (National Research University). He is specialist in the field of chemicals and technologies for oil and gas production. He is author of more than 20 scientific publications. E-mail: malkindn@gmail.com
Ljubov’ A. MAGADOVA graduated from Gubkin Moscow Institute of Petrochemical and Gas Industry 1975. She is Doctor of Technical Sciences, Professor at the Department of Chemical Technology for Oil and Gas Industry of Gubkin Russian State University of Oil and Gas (National Research University). She is Head of Laboratory of Scientific and Educational Center for Field Chemistry. She is specialist in the field of oilfield chemistry. She is author of more than 230 scientific publications. E-mail: lubmag@gmail.com
Mihail A. SILIN graduated from Gubkin Moscow Institute of Petrochemical and Gas Industry in 1978. He is Doctor of Chemical Sciences, Head at the Department of Chemical Technology for Oil and Gas Industry of Gubkin Russian State University of Oil and Gas (National Research University). He is specialist in the field of chemicals and technologies for oil and gas production. He is author of more than 250 scientific publications. E-mail: silin.m@gubkin.ru
Polina K. KRISANOVA graduated from Gubkin Russian State University of Oil and Gas (National Research University) in 2017. She is postgraduate student at the Department of Chemical Technology for Oil and Gas Industry of Gubkin Russian State University of Oil and Gas (National Research University). E-mail: krisanova_polina@mail.ru
Varvara A. KRASHEVNIKOVA is student at the Department of Chemical Technology for Oil and Gas Industry of Gubkin Russian State University of Oil and Gas (National Research University). E-mail: krashevnikova_va@mail.ru

Abstract: Aqueous solutions of polymers are most common hydraulic fracturing fluid, however, when applied they deteriorate reservoir properties due to the formation damage with the remains of an undamaged polymer gel. This work describes studies aimed at creating a modified polymer-free fluid for hydraulic fracturing based on a viscoelastic surfactant of national production NEFTENOL VUPAV. To give the viscoelastic composition the necessary technological properties of the fracturing fluid (high viscosity, elasticity, proppant-support properties, etc.), a new activator reagent was proposed, which is an aqueous solution of salts of metals of different chemical valences. It has been established that the introduction of the developed activator into the composition of a polymer-free fracturing fluid makes it possible to create systems with high elastic and viscous properties with lower concentrations of the surfactant. A comparative analysis of the characteristics of the widely used polymer fracturing fluids and the developed composition based on NEFTENOL VUPAV with the addition of an activator has been carried out. It was found that the NEFTENOL VUPAV-activator system can be used as a potential proppant fracturing fluid

Index UDK: 622.276.64/66

Keywords: hydraulic fracturing, gel, viscoelastic surfactant, viscosity, proppant

Bibliography:
1. Magadova L.A., Silin M.A., Gluschenko V.N. Neftepromyslovaja himija. Tehnologicheskie aspekty i materialy dlja gidrorazryva plasta [Oilfield chemistry. Technological aspects and materials for hydraulic fracturing]. Moscow, RGU nefti i gaza imeni I.M. Gubkina Publ., 2012, 423 p.
2. Shipilov A.I., Babkina N.V., Men’shikov I.A. Issledovanie svojstv tehnologicheskoj zhidkosti dlja gidrorazryva plasta na osnove vjazkouprugih PAV [Study of the properties of a process fluid for fracturing based on a viscoelastic surfactant]. Neftyanoe khozyaistvo [Oil Industry], 2018, no. 3, p. 30-33.
3. Rawat A., Tripathi A., Gupta C. (2014, March 25). Case Evaluating Acid Stimulated Multilayered Well Performance in Offshore Carbonate Reservoir: Bombay High. Offshore Technology Conference. DOI: 10.4043/25018-MS.
4. Kurjashov D.A. Samoorganizacija v smeshannyh micelljarnyh rastvorah cvitter-ionnogo i anionnogo poverhnostno-aktivnyh veshhestv [Self-organization in mixed micellar solutions of zwitterionic and anionic surfactants]. Vestnik Kazanskogo tehnologicheskogo universiteta [Bulletin of Kazan Technological University], 2013, vol. 16, no. 1, p. 32-36.
5. Silin M.A., Magadova M.A., Malkin D.N., Krisanova P.K., Borodin S.A., Fan Vu An’. Bespolimernaja tehnologicheskaja zhidkost’ dlja gidrorazryva plasta na osnove vjazkouprugih poverhnostno-aktivnyh veshhestv [Polymer-free fluid for hydraulic fracturing based on viscoelastic surfactants]. TERRITORIJA NEFTEGAZ [OIL AND GAS TERRITORY], 2017, no. 5, p. 14-19.
6. Samuel М., Polson D., Graham D., Kordzie W., Waite T., Waters G., Vnod P.S, Fu D. and Downey R. (2000, January 1). Viscoelastic Surfactant Fracturing Fluids: Applications in Low Permeability Reservoirs. Society of Petroleum Engineers. DOI: 10.2118/ 60322-MS.

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.