Thickener based on a cationic polymer, a method for production thereof and a heat-resistant fluid for hydraulic fracturing of a formation, obtained using it

FIELD: chemistry.SUBSTANCE: invention relates to a thickener based on a cationic polymer obtained as follows: using methanol as a solvent, N,N-dimethyl-1,3-propanediamine and benzaldehyde are heated under reflux at 70 °C for 2–12 hours; temperature of reaction system is reduced to 0–5 °C; several times sodium borohydride is added in small amounts; obtaining N-benzyl-N,N-dimethylamino-1,3-propanediamine; methylene chloride, N-benzyl-N,N-dimethylamino-1,3-propanediamine and aqueous NaOH solution are added to a three-necked flask; slowly adding acryloyl chloride dropwise; temperature is raised to room temperature; reaction is carried out for 2–12 hours; obtaining N-benzyl-N-(3-(dimethylamino)propyl)acrylamide; using acetone as a solvent, N-benzyl-N-(3-(dimethylamino)propyl)acrylamide and bromalkane are heated under reflux at 50–60 °C for 36 hours to obtain a cationic monomer; acrylamide, a cationic thickener and an initiator are added to the distilled water, placed in a photoinitiator and the reaction is carried out for 3–5 hours to obtain a thickener based on the cationic polymer. Heat-resistant fluid for hydraulic fracturing of the formation is obtained using said thickener.EFFECT: high stability, heat resistance, salt resistance when used in hydraulic fracturing at oil and gas fields.4 cl, 2 ex, 6 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 722 804 C1 (51) МПК C09K 8/68 (2006.01) C09K 8/584 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК C09K 8/584 (2020.02); C09K 8/68 (2020.02); C09K 2208/10 (2020.02); Y10S 507/932 (2020.02) (21)(22) Заявка: 2019130729, 30.09.2019 (24) Дата начала отсчета срока действия патента: Дата регистрации: (73) Патентообладатель(и): Саусвест Петролиэм Юниверсити (СВПЮ) (CN) 04.06.2020 10.06.2019 CN 201910497386.4 (45) Опубликовано: 04.06.2020 Бюл. № 16 2 7 2 2 8 0 4 R U (54) ЗАГУСТИТЕЛЬ НА ОСНОВЕ КАТИОННОГО ПОЛИМЕРА, СПОСОБ ЕГО ПОЛУЧЕНИЯ И ТЕРМОСТОЙКАЯ ЖИДКОСТЬ ДЛЯ ГИДРОРАЗРЫВА ...

Method of producing modified corrosion inhibitor by acidification of chitosan

Изобретение относится к получению модифицированного ингибитора коррозии подкислением хитозана. В способе хитозан растворяют в разбавленном растворе кислоты с получение разбавленного кислотного раствора хитозана, альдегиды растворяют в этаноле, пропаноле или изопропаноле с получением спиртового раствора альдегидов. Далее медленно добавляют спиртовой раствор альдегидов к разбавленному кислотному раствору хитозана, нагревают раствор до 80-100°C и перемешивают раствор для обеспечения его реакции в течение 2-4 часов. Потом добавляют кетоны, используют соляную кислоту для доведения значения pH до 3-5, продолжают реакцию в течение 8-10 часов. После завершения реакции выполняют вакуумную дистилляцию, промывку и высушивание с получением тем самым модифицированного ингибитора коррозии на основе подкисленного хитозана. Альдегиды представляют собой коричный альдегид, анисовый альдегид, ванилин, цитраль или периллальдегид, а кетоны представляют собой 2-пентанон, бензальацетон или п-ацетамидоциклогексанон. Обеспечивается получение ингибитора коррозии, обладающего хорошими характеристиками ингибирования коррозии при высоких температурах, оказывающего ингибирующее воздействие на кислотную коррозию углеродистой стали в нефтяных и газовых скважинах. 3 з.п. ф-лы, 1 табл., 5 пр. РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 769 376 C1 (51) МПК C23F 11/14 (2006.01) C09K 8/54 (2006.01) C08B 37/08 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК C23F 11/14 (2021.08); C09K 8/54 (2021.08); C08B 37/003 (2021.08) (21)(22) Заявка: 2021102728, 05.02.2021 (24) Дата начала отсчета срока действия патента: (73) Патентообладатель(и): Саусвест Петролиэм Юниверсити (СВПЮ) (CN) Дата регистрации: 31.03.2022 03.08.2020 CN 202010767417.6 (45) Опубликовано: 31.03.2022 Бюл. № 10 2 7 6 9 3 7 6 R U (54) СПОСОБ ПОЛУЧЕНИЯ МОДИФИЦИРОВАННОГО ИНГИБИТОРА КОРРОЗИИ ПОДКИСЛЕНИЕМ ХИТОЗАНА (57) Реферат: Изобретение относится к получению вакуумную дистилляцию, ...

Installation for testing with respect to deformation of metal casing pipe in process of waiting for hardening of cement mortar for well cementing

FIELD: testing technology. SUBSTANCE: invention relates to a device for testing deformation of a metal casing while waiting for hardening of a cement mortar for cementing a well, which comprises a high temperature and high pressure boiler; air compressor pump; container for mixing and accumulation of cement mortar; device for increasing fluid pressure; rulers for measuring deformation of the casing and a computing device with a data display system; high temperature and high pressure boiler on the left side is equipped with an oil inlet hole for heat-conducting oil and pressure sensors, and on the right side it is equipped with an oil return hole for heat-conducting oil and a heating device; open holes are made in the boiler cover, into which thermocouples are inserted; boiler bottom is equipped with a hole for pumping cement mortar; inside the boiler there is a cylinder for simulating a casing pipe; heating device, thermocouples and pressure sensors are connected to a computing device with a data display system; rulers for measuring deformation of the casing pipe contain a horizontal ruler for measuring deformation and a vertical ruler for measuring deformation, which are used to perform measurements when simulating horizontal and vertical deformation of the casing pipe. EFFECT: rationalization of the design is provided, which enables to conduct tests for the value of the casing pipe deformation caused by the fact that at different temperature and pressure the cement mortar for cementing the well expands, wherein the test process is convenient and fast, and the test results are as close as possible to real working conditions under the ground. 6 cl, 2 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 766 992 C1 (51) МПК E21B 17/00 (2006.01) E21B 47/00 (2012.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК E21B 17/00 (2022.01); G01N 3/02 (2022.01); G01N 3/18 (2022.01) (21)(22) Заявка: 2021122684, 29.07.2021 (24) Дата ...

Method of calculating productivity of horizontal wells in deposits of shale gas during hydraulic fracturing in conditions of non-stationary diffusion

FIELD: mining. SUBSTANCE: invention relates to a method of calculating the productivity of horizontal wells in deposits of shale gas during hydraulic fracturing under conditions of non-stationary diffusion. Method comprising steps of: collecting hydraulic fracturing parameters obtained as a result of a hydraulic fracturing operation, and calculating coefficient of elastic capacity of shale gas deposit, coefficient of permeation between pores under conditions of non-stationary diffusion, module of dimensionless permeability, adsorption/desorption coefficient of shale gas and limited throughput capacity of fractures from hydraulic fracturing. Position of cracks from hydraulic fracturing is determined in rectangular coordinate system; cracks are separated from hydraulic fracturing and coordinates of microelements of all cracks are determined; on the basis of the theory of the point source function and the superposition principle for pressure drops pressure is found at the end of each fracture from hydraulic fracturing. Based on the principle of equivalent area, a model of leakage through fractures from hydraulic fracturing is created with obtaining pressure for each fracture from hydraulic fracturing in the horizontal wellbore. Productivity of a horizontal well in deposits of shale gas during hydraulic fracturing under conditions of non-stationary diffusion is calculated. EFFECT: present invention is reliable and simple to use, wherein on the basis of the specified parameters of the shale gas collector and parameters of fractures from hydraulic fracturing, productivity of horizontal wells in deposits of shale gas during hydraulic fracturing under conditions of non-stationary diffusion can be accurately predicted. 1 cl, 2 dwg, 1 tbl РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 732 868 C1 (51) МПК E21B 47/10 (2012.01) E21B 43/26 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК E21B 47/10 (2020.02); E21B 43/26 (2020. ...

Method of calculating volume of reverse flow of fluid for hydraulic fracturing of formation during hydraulic fracturing in horizontal wells in gas deposits of fractured sandstones

FIELD: oil and gas industry.SUBSTANCE: present invention relates to development of oil and gas deposits, and, in particular, it relates to calculation of volume of reverse flow of fluid for hydraulic fracturing of formation at hydraulic fracturing in horizontal wells in gas deposits of fractured sandstones. Method includes steps of fractal distribution of cracks in the area of target collector D, fractures length fractal dimension D, based on crack data on-site, coefficient of density of fractures location α and Fisher constant K. Then on the basis of obtained parameters of cracks model of fractal discrete network of cracks for collector is created. After that, equivalent permeability tensor of model of fractal discrete network of cracks is calculated. Further, equivalent permeability tensor is substituted into equation of continuity of two-phase, gas-liquid, filtration flow with creation of model of reverse fluid flow for formation hydraulic fracturing. Mathematical model of reverse flow of fluid for formation hydraulic fracturing is solved, and liquid phase saturation is found with further calculation of back flow volume for formation hydraulic fracturing.EFFECT: technical result consists in improvement of reliability and accuracy of calculation results, as well as reliability and ease of use.5 cl, 1 tbl, 3 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 723 769 C1 (51) МПК E21B 47/10 (2012.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК E21B 47/10 (2020.02) (21)(22) Заявка: 2019131934, 10.10.2019 (24) Дата начала отсчета срока действия патента: Дата регистрации: (73) Патентообладатель(и): Саусвест Петролиэм Юниверсити (СВПЮ) (CN) 17.06.2020 04.06.2019 CN 201910482321.2 (45) Опубликовано: 17.06.2020 Бюл. № 17 2 7 2 3 7 6 9 R U (54) СПОСОБ РАСЧЕТА ОБЪЕМА ОБРАТНОГО ПОТОКА ЖИДКОСТИ ДЛЯ ГИДРОРАЗРЫВА ПЛАСТА ПРИ ГИДРОРАЗРЫВЕ В ГОРИЗОНТАЛЬНЫХ СКВАЖИНАХ В ЗАЛЕЖАХ ГАЗА ТРЕЩИНОВАТЫХ ПЕСЧАНИКОВ (57) Реферат: Настоящее ...

Installation for testing the influence of the heat of hydration of cement or drilling mud on the stability of natural gas hydrate

FIELD: testing devices.SUBSTANCE: present invention relates to an apparatus for testing the effect of the heat of hydration of a cement or drilling mud on the stability of natural gas hydrate, which comprises a gas source 1; pressure control valve 2; device 3 for measuring the mass flow of gas; pressure gauge 4; thermostatic tank 6; switching valve 7 water source; made with the possibility of observation of the reaction boiler 8; control panel 13; computing device 16; heating jacket 23; pressure sensor 24; temperature sensor 25; at the same time, the reaction boiler, made with the possibility of observation, is connected in series with a pressure gauge, a gas mass flow measurement device, a pressure control valve and a gas source, and is also connected to a thermostatic tank by means of a water source switching valve. The reaction boiler is surrounded on the outside by a heating jacket, on which several temperature sensors and pressure sensors are respectively located on both sides. When used in the process of cementing a well, a cylinder with a cement slurry is fixed in the center of the boiler body, while a cement slurry is placed in the cylinder with a solution; when used in a well drilling process, a drilling fluid circulation line is located in the center of the boiler body, wherein the drilling fluid circulation line is connected to the drilling fluid pumping line.EFFECT: present invention is characterized by a simple and fast testing process and can be used in studies of the effects of heat released during hydration of cement slurry and drilling fluid on the stability of natural gas hydrate.4 cl, 3 dwg

Способ определения времени кипения скважины после гидроразрыва с использованием распространения ползучести трещин гидроразрыва