Spontaneous imbibition experiments for enhanced oil recovery with silica nanosols

Experimental oil displacement as a result of spontaneous imbibition of silica nanosols has been carried out using two types of sandstone as the reservoir rock. The permeability of the cores ranged from 0.34 to 333 mD, while the porosity was 11% and 22%, respectively. During the research, the influence of the concentration and nanoparticle size, as well as the permeability of the rock, on the process of spontaneous imbibition, was studied. Silica nanosols were considered as an object of study. The nanoparticle size ranged from 10 to 35 nm. The mass concentration of nanoparticles varied from 0.01% to 0.25%. It was found that the use of silica nanosols significantly increases the rate of the spontaneous imbibition process. It was established that a silica nanosol with a nanoparticle size of 10 nm and a concentration of 0.25% allows to displace more than six times oil compared to the reservoir water model in the same time. As a result, it was shown that the oil displacement efficiency and the efficiency of spontaneous imbibition increase along with an increase in the nanoparticle concentration and a decrease in the nanoparticle size.Document Type: Original articleCited as: Pryazhnikov, M. I., Zhigarev, V. A., Minakov, A. V., Nemtsev, I. V. Spontaneous imbibition experiments for enhanced oil recovery with silica nanosols. Capillarity, 2024, 10(3): 73-86. https://doi.org/10.46690/capi.2024.03.0

Superconducting properties of the In-substituted topological crystalline insulator, SnTe

We report detailed investigations of the properties of a superconductor obtained by substituting In at the Sn site in the topological crystalline insulator (TCI), SnTe. Transport, magnetization and heat capacity measurements have been performed on crystals of Sn$_{0.6}$In$_{0.4}$Te, which is shown to be a bulk superconductor with $T_c^{\rm{onset}}$ at $\sim4.70(5)$~K and $T_c^{\rm{zero}}$ at $\sim3.50(5)$~K. The upper and lower critical fields are estimated to be $\mu_0H_{c2}(0)=1.42(3)$~T and $\mu_0H_{c1}(0)=0.90(3)$~mT respectively, while $\kappa=56.4(8)$ indicates this material is a strongly type II superconductor

Application of Additive Technologies for the Development of Microfluidic Chip Models of Rocks

В статье представлены результаты работы по апробации возможности применения современных и доступных аддитивных технологий на основе фотополимерного принтера для изготовления прототипов микрофлюидных устройств, пригодных для решения задач нефтегазовой индустрии. Исследовано два способа создания микрофлюидных устройств с помощью аддитивных технологий. Первый – изготовление мастер- формы для последующей отливки в ней ПДМС, второй – изготовление микрофлюидного чипа с полностью трехмерными каналами. Отработана методика создания мастер- формы с каналами необходимой геометрии для заливки ПДМС из фотоотверждаемого полимера методом стереолитографической печати. Данная методика была успешно протестирована на изготовлении микрофлюидного чипа с каналами минимальной ширины 100 мкм. Был спроектирован и изготовлен микрофлюидный чип с трехмерной структурой каналов. Показано, что с помощью печати мастер-формы для последующей отливки в ней ПДМС возможно изготавливать микрофлюидные чипы с шириной канала 100 мкм при высоте 50 мкм. Такие устройства могут найти своё применение при моделировании процессов нефтевытеснения из твёрдых горных породThe article presents the results of work on testing the possibility of using modern and affordable additive technologies based on a photopolymer printer for the manufacture of prototypes of microfluidic devices suitable for solving problems in the oil and gas industry. Two methods for creating microfluidic devices using additive technologies have been studied. The first one is the production of a master mold for subsequent casting of PDMS in it, the second is the production of a microfluidic chip with fully three-dimensional channels. A technique has been developed for creating a master mold with channels of the required geometry for pouring PDMS from a photocurable polymer using stereolithographic printing. This technique was successfully tested for the production of a microfluidic chip with channels with a minimum width of 100 μm. A microfluidic chip with a three-dimensional channel structure was designed and fabricated. It was shown that by printing a master mold for subsequent casting of PDMS in it, it is possible to produce microfluidic chips with a channel width of 100 μm and a height of 50 μm. Such devices can find their application in modeling processes of oil displacement from solid rock

Study of Colloidal Stability and Rheological Properties of Invert Emulsion with Vegetable Oil as the Base for Drilling Fluid

Работа посвящена проведению комплексных исследований коллоидной устойчивости и реологических свойств обратных эмульсий на основе технического рапсового масла и разработке на их основе рекомендаций использования данных экологически чистых компонентов в качестве основы для создания буровых растворов. Исследование свойств эмульсий производилось в зависимости от концентрации масла (от 50 до 90 об.%), концентрации эмульгатора (от 1 до 3 об.%) и температуры (от 20 до 80 оС). Были получены устойчивые инвертные эмульсии, которые сохраняют свои свойства с ростом температуры, что говорит о возможности их практического применения в качестве компонентов для создания экологически более безопасных буровых растворовThe paper is devoted to comprehensive studies of the colloidal stability and rheological properties of inverse emulsions based on technical rapeseed oil and developing on their base recommendations for using these environmentally friendly components as the base for synthesis drilling fluids. The study of the properties of emulsions was carried out depending on the concentration of oil (from 50 to 90 vol.%), the concentration of the emulsifier (from 1 to 3 vol.%) and temperature (from 20 to 80 °C). Stable invert emulsions were obtained, which retain their properties with increasing temperature, which indicates the possibility of their practical application as components for synthesis environmentally safer drilling fluid

EXPERIMENTAL STUDY OF THE SWIRLING FLOW EFFECT ON THE EFFICIENCY OF THE LOCAL VENTILATION SYSTEM

The paper presents the results of an experimental study of the local ventilation system. It is shown that the use of radially swirled counter-flow jet leads to significant increase in the efficiency of gas removing. This fact is confirmed by the flow visualization for different operating regimes of the device (with and without swirling). The velocity distribution along the central axis of the device was also measured. It is also shown that the use of swirling flow leads to significant increase in the velocity of removal flow. Study of the system operating parameters for different direct and counter flow ratio was carried out

Experimental study of the swirling flow effect on the efficiency of the local ventilation system

The paper presents the results of an experimental study of the local ventilation system. It is shown that the use of radially swirled counter-flow jet leads to significant increase in the efficiency of gas removing. This fact is confirmed by the flow visualization for different operating regimes of the device (with and without swirling). The velocity distribution along the central axis of the device was also measured. It is also shown that the use of swirling flow leads to significant increase in the velocity of removal flow. Study of the system operating parameters for different direct and counter flow ratio was carried out