Kalacheva L.P.

lpko@mail.ru




Graduated from Irkutsk State University (1993), specialization "chemistry".
PhD in Chemistry.
Leading Researcher of Institute of Oil and Gas Problems of the Siberian Branch of Russian Academy of Sciences (IOGP SB RAS).
Area of scientific interests: gas hydrates, thermodynamics of phase transitions, kinetics of hydrate formation and decomposition.
Author of 120 publications, 1 patent.
Regional petroleum geology
Article # 43_2023 submitted on 10/20/2023 displayed on website on 11/28/2023
18 p.
pdf Assessment of the possibility of carbon dioxide burial in a hydrate state in the sub-permafrost aquifers of the Vilyuy syneclise
The paper presents the results of experimental studies of the carbon dioxide hydrates formation and decomposition processes in porous media with different types of salinity using the method of differential thermal analysis. Equilibrium conditions of carbon dioxide hydrate formation in porous media salinized with solutions of bicarbonate and sodium chloride, the concentration of which corresponds to the composition and mineralization of sheet waters in the sub-permafrost aquifers of the Vilyuy syneclise, were obtained. The boundaries of the carbon dioxide hydrate stability zone were assessed using as the example a geological exploration area 15-Kenkemen. It has been established that, depending on thermobaric conditions and depth, hydrate formation processes can occur from water (ice) and gaseous and liquid carbon dioxide.

Keywords: carbon dioxide hydrate, porous media, equilibrium conditions of hydrate formation, carbon dioxide hydrate stability zone, sub-permafrost aquifers, sodium bicarbonate, sodium chloride, Vilyuy syneclise.
article citation Kalacheva L.P., Ivanova I.K., Portnyagin A.S., Ivanov V.K., Argunova K.K., Bubnova А.R. Otsenka vozmozhnosti zakhoroneniya uglekislogo gaza v gidratnom sostoyanii v podmerzlotnykh vodonosnykh gorizontakh Vilyuyskoy sineklizy [Assessment of the possibility of carbon dioxide burial in a hydrate state in the sub-permafrost aquifers of the Vilyuy syneclise]. Neftegazovaya Geologiya. Teoriya I Praktika, 2023, vol. 18, no. 4, available at: http://www.ngtp.ru/rub/2023/43_2023.html EDN: DLKKNY
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Hard-extracted reserves, unconventional hydrocarbon sources
Article # 35_2022 submitted on 09/30/2022 displayed on website on 10/14/2022
18 p.
pdf Investigation of the natural gas hydrates formation in the systems "stratum water - porous medium - polymer solution" according to the data of differential thermal analysis
The article presents the results of studies of thermodynamic and kinetic characteristics of the natural gas hydrates formation in the systems "stratum water - porous medium - polymer solution". Commercially available polymer samples were used in the experiments: polyacrylamide, sodium carboxymethyl cellulose and polyethylene glycol. A solution of calcium chloride with a concentration of 400 g/l served as a model of stratum water, and quartz monodispersed sand was used as a porous medium. It has been established that the calcium chloride solution has a significant effect on the process of the natural gas hydrates formation. It is shown that in all studied systems, except for the models containing the sodium carboxymethyl cellulose solution, the addition of the calcium chloride solution leads to an increase of the supercooling degree of these systems, and there is a direct dependence between the supercooling degree and the concentration of the calcium chloride. The calculation of the kinetic parameters of the hydrate formation in the studied systems showed that the degree of water conversion into hydrate and the rate of hydrate formation are significantly reduced even at low concentrations of calcium chloride.

Keywords: natural gas hydrates, polymer solutions, porous media, calcium chloride solution.
article citation Portnyagin A.S., Kalacheva L.P., Ivanova I.K. Izuchenie protsessov obrazovaniya gidratov prirodnogo gaza v sistemakh «plastovaya voda - poristaya sreda - rastvor polimera» po dannym differentsial'nogo termicheskogo analiza [Investigation of the natural gas hydrates formation in the systems "stratum water - porous medium - polymer solution" according to the data of differential thermal analysis]. Neftegazovaya Geologiya. Teoriya I Praktika, 2022, vol. 17, no. 4, available at: http://www.ngtp.ru/rub/2022/35_2022.html
DOI https://doi.org/10.17353/2070-5379/35_2022
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Regional petroleum geology
Section editor – PhD in geology and mineralogy Makarevich V.N.
Article # 42_2018 submitted on 10/04/2018 displayed on website on 11/30/2018
16 p.
pdf Studying the possibility of hydratе formation and salt deposition in the bottom hole of wells of Chayanda oil-gas-condensate field
The actual problems of development of the Chayanda oil-gas-condensate field, related to the features of the geological characteristics of productive horizons and reservoir fluids, are considered. To compile recommendations for reducing the risks of natural gas production, the probability of hydrate formation and salt depositions is estimated using the example of the botuobinsky productive horizon.
The equilibrium conditions of hydrate formation are calculated based on the physicochemical properties of formation fluids. It is concluded that in the development and exploitation of the Chayanda oil-gas-condensate field due to an abnormally low reservoir temperature, in spite of the high mineralization of the formation water, it is possible to form gas hydrates. The minimum concentrations of a calcium chloride solution and a water-methanol solution that prevent hydrate formation at a characteristic reservoir temperature are determined. It is established that an increase in the mineralization of calcium chloride solutions leads to the concentration in the clathrate phase of C2-C4 hydrocarbons and to an increase the fat coefficient of gas. It is shown that mixing of highly mineralized formation waters with a water-methanol solution can lead to salt depositions in the bottom hole zone of wells.

Keywords: natural gas, hydrate formation, stratum water, mineralization, water-methanol solution, salt deposition, Chayanda oil-gas-condensate field, Nepа-Botuoba anteclise.
article citation Kalacheva L.P., Rozhin I.I., Sivtsev A.I. Izuchenie vozmozhnosti gidratoobrazovaniya i soleotlozheniya v prizaboynoy zone skvazhin Chayandinskogo neftegazokondensatnogo mestorozhdeniya [Studying the possibility of hydratе formation and salt deposition in the bottom hole of wells of Chayanda oil-gas-condensate field]. Neftegazovaya Geologiya. Teoriya I Praktika, 2018, vol. 13, no. 4, available at: http://www.ngtp.ru/rub/2018/42_2018.html
DOI https://doi.org/10.17353/2070-5379/42_2018
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Hard-extracted reserves, unconventional hydrocarbon sources
Section editor – PhD in geology and mineralogy Petukhov A.V.
Article # 25_2017 submitted on 05/22/2017 displayed on website on 07/07/2017
13 p.
pdf  The influence of the chloride-calcium-type water composition on the properties of natural gas hydrates
The properties of natural gas hydrates obtained from mineralized solutions of chloride-calcium type of different composition were investigated. It is established that, depending on the type of prevailing cation in the solution, the thermodynamic conditions of hydrate formation, the gas content of hydrates, their texture, the component composition of the gas in the solid phase are changed. During hydrate formation, a dry natural gas is converted to a fatty gas with a higher calorific value. The study of dissociation processes of hydrates showed an increase of the decomposition rate of hydrates obtained in electrolytes solutions.

Keywords: natural gas hydrates, mineralization of stratum waters, hydrate formation, gas content of hydrates, component composition of gas-hydrate-forming agent, hydrate texture, kinetics of hydrate decomposition.
article citation Kalacheva L.P., Rozhin I.I. Vliyanie sostava vod khloridno-kal'tsievogo tipa na svoystva gidratov prirodnogo gaza [The influence of the chloride-calcium-type water composition on the properties of natural gas hydrates]. Neftegazovaya Geologiya. Teoriya I Praktika, 2017, vol. 12, no. 3, available at: http://www.ngtp.ru/rub/9/25_2017.pdf
DOI https://doi.org/10.17353/2070-5379/25_2017
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