Use of computational topology to quantify changes in pore space due to chemical dissolution of core matrix: A numerical study

Author(s):  
V. Lisitsa ◽  
T. Khachkova ◽  
Y. Bazaikin
2020 ◽  
Author(s):  
Fenglei Huang ◽  
Zhe Chen ◽  
Zhipeng Li ◽  
Zhengming Gao ◽  
Jos Derksen ◽  
...  
Keyword(s):  

Author(s):  
Д.И. Прохоров ◽  
Я.В. Базайкин ◽  
В.В. Лисица

В работе предложен алгоритм редукции трехмерных цифровых изображений для ускорения вычисления персистентных диаграмм, характеризующих изменения в топологии порового пространства образцов горной породы. Воксели для удаления выбираются исходя из структуры своей окрестности, что позволяет редуцировать изображение за линейное время. Показано, что эффективность алгоритма существенно зависит от сложности устройства порового пространства и размеров шагов фильтрации. A new algorithm for the reduction of three-dimensional digital images is proposed to improve the performance of persistence diagrams computing. These diagrams represent changes in topology of the pore space in the rock matrix. The algorithm has a linear complexity, since the removal of the voxel is based on the structure of its neighborhood. It is shown that the efficiency of the algorithm depends heavily on the complexity of the pore space and the size of filtering steps.


2021 ◽  
Vol 233 ◽  
pp. 116351
Author(s):  
Fenglei Huang ◽  
Zhe Chen ◽  
Zhipeng Li ◽  
Zhengming Gao ◽  
J.J. Derksen ◽  
...  
Keyword(s):  

2010 ◽  
Vol 297-301 ◽  
pp. 960-965 ◽  
Author(s):  
Jean Michel Hugo ◽  
Emmanuel Brun ◽  
Frédéric Topin ◽  
Jérôme Vicente

This numerical study focuses on the determination of macroscopic (effective) properties from pore scale calculation. These results will be applied to heat exchangers design. The computational domain -representative of heat exchanger section- is a parallelepiped filled with metallic foam, heated on one face and crossed by a forced fluid flow. Conjugate heat transfer and fluid flow are computed using finite volume approach on the actual solid matrix and pore space topology obtained from X-ray tomograms. Calculated heat transfer coefficient and flow law parameters are in good agreement with literature data. An active foam length is defined and measured in order to provide optimal design characteristic for foamed heat exchanger.


Georesursy ◽  
2021 ◽  
Vol 23 (1) ◽  
pp. 112-117
Author(s):  
Leonid A. Gaydukov

A laboratory and numerical study of the mechanisms that affect the structure and physical properties of the borehole zone of a production well at various stages of development of a saline formation with textural wettability was conducted. It is shown that for the object of study is characterized by the formation of complex borehole vicinity of the structure and dynamic change of properties which define the specific geotechnical effects: desalinization; pinched adscititious water in the pore space; the decompression and the strain on the washed areas; precipitation of solid salt sediment at the moment of breaking through the highly mineralized front of the injected water. The synergetic effect of these effects leads to the formation of complex, including non-monotonic, permeability distribution profiles in the near-well zone.


Author(s):  
Т.С. Хачкова ◽  
Я.В. Базайкин ◽  
В.В. Лисица

Представлен алгоритм построения персистентных диаграмм для оценки изменения топологии матрицы породы при взаимодействии с химически активным флюидом. В пространстве персистентных диаграмм вводится метрика, которая позволяет выполнять их кластеризацию для количественной оценки схожести изменений топологии порового пространства в процессе растворения матрицы породы. На основе такой кластеризации показано, что одним из доминирующих параметров в процессе химического взаимодействия флюида с породой в пластовых условиях являются скорость реакции и коэффициент диффузии, в то время как скорость потока оказывает существенно меньшее влияние. A new algorithm for constructing the persistence diagrams to estimate the changes in the rock matrix topology during the chemical fluid-solid interaction. In the space of the persistence diagrams, a metric is introduced, which allows one to clusterize the diagrams in order to estimate their dissimilarities in the topology changes. This clusterization shows that the main parameters affecting the topology of the rock matrix are the reaction rate and the diffusion coefficient, whereas the fluid flow rate makes a smaller effect on the topology.


2021 ◽  
Author(s):  
Ivan Utkin ◽  
Yury Podladchikov ◽  
Oleg Melnik

<p>One of the mechanisms of magma generation in the Earth's crust is the reaction of dehydration during subduction process. Water is released from subducting lithosphere which leads to the lowering of the melting temperature of mantle rock by hundreds of degrees.</p><p>In this work, we present a numerical study of the formation and rise of magma to the Earth's surface, considering partial melting and crystallization of rocks and chemical differentiation of magma. We develop a coupled model of the filtration flow of melt and magmatic fluid through deformable permeable rocks and a thermodynamic model of plagioclase melting based on Gibbs energy minimization approach. The formation of regions with a high melt concentration due to spontaneous focusing of filtration flow being the result of viscoplastic (de)compaction of the pore space is shown. The influence of mechanical properties of rocks and chemical composition of the system on the dynamics of the process is investigated.</p>


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