Study of Carbonate Rock Dissolution Using X-Ray Microcomputed Tomography: Impact of Acid Flow Rate

Akasheva, Zh.K.; Bolysbek, D.A.; Assilbekov, B.K.

doi:10.32014/2023.2518-170x.256

Cited by 3 publications

(5 citation statements)

References 12 publications

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“…As can be seen from Figure 5a, there is only one fracture present on each slice of the sample, which indicates their short length along the length of the sample. To remove noises from the original images obtained using X-ray microcomputed tomography, a median filter was used [36]. It can be seen from Figures 5 and 6 that there is a good visual match of the processed images with the original images of sample slices.…”

Section: Change In Pore Space Due To Rock Dissolutionmentioning

confidence: 99%

“…The largest increases in permeability (8.81 and 9.11 times) were observed in samples #2 and #4 at solution injection rates of 8 and 4 mL/min, respectively. To remove noises from the original images obtained using X-ray microcomputed tomography, a median filter was used [36]. It can be seen from Figures 5 and 6 that there is a good visual match of the processed images with the original images of sample slices.…”

Section: Change In Pore Space Due To Rock Dissolutionmentioning

confidence: 99%

“…Thus, samples #1, #3, and #4 will be considered as heterogeneous samples, and sample #2 will be considered as naturally fractured. To remove noises from the original images obtained using X-ray microcomputed tomography, a median filter was used [36]. It can be seen from Figures 5 and 6 that there is a good visual match of the processed images with the original images of sample slices.…”

Section: Change In Pore Space Due To Rock Dissolutionmentioning

confidence: 99%

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Experimental and Numerical Study of the Effect of Rock Dissolution on Absolute Permeability of Limestone Sub-Samples

Akasheva,

Assilbekov,

Bolysbek

et al. 2023

Applied Sciences

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Permeability is a key transport property of porous materials, and its accurate evaluation is relevant when studying applied tasks, such as CO2 injection into reservoirs and investigating groundwater quality. This study examines the dependence of permeability on total and connected porosity, hydraulic tortuosity, specific surface area, and mean pore radius based on the data of 408 cubic sub-volumes extracted from heterogeneous and naturally fractured cylindrical carbonate samples, before and after injection of HCl solutions. These parameters were computed using pore-scale modeling of fluid flow. Our results show that permeability correlates well with porosity and mean pore radius, with correlation coefficients of R2≈0.65−0.79 for heterogeneous samples. It was found that the presence of natural fractures significantly influenced the relationship between permeability and other parameters. The relationship between permeability k, tortuosity τ, and specific surface area S is described by the power laws k~τ−α and k~S−β, with coefficients α and β substantially exceeding those in the Kozeny–Carman equation. It was also found that there is a parabolic relationship between connected and total porosities, both before and after rock dissolution with R2≈0.96−0.99. This allowed for an estimation of percolation threshold porosity in accordance with the literature data.

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Section: Change In Pore Space Due To Rock Dissolutionmentioning

confidence: 99%

Section: Change In Pore Space Due To Rock Dissolutionmentioning

confidence: 99%

Section: Change In Pore Space Due To Rock Dissolutionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental and Numerical Study of the Effect of Rock Dissolution on Absolute Permeability of Limestone Sub-Samples

Akasheva,

Assilbekov,

Bolysbek

et al. 2023

Applied Sciences

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“…Было исследовано влияние геометрии пор на эффективность процессов растворения в карбонатных образцах [17]. Изучено влияние воздействия разных видов кислотных составов на карбонатные породы при медленных скоростях [18].…”

Section: Introductionunclassified

“…Для достижения этой цели были использованы 5 цилиндрических образцов карбоната. В каждый из них был закачан 12%-й раствор соляной кислоты с разной скоростьюот 0,5 до 32 мл/мин, а также были использованы дополнительные экспериментальные и цифровые данные образцов из работы [18].…”

Section: Introductionunclassified

Experimental study of carbonate samples dissolution using X-ray microcomputer-based tomography

Bolysbek,

Kulzhabekov,

Bekbau

2024

Kazakhstan journal for oil & gas industry

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Background: The study of the interaction of hydrochloric acid with carbonate materialsis important in the oil and gas industry. Carbonate rocks are common rock types, and half of all petroleum reserves worldwide are found in carbonate deposits. Understanding the mechanisms and characteristics of dissolution of carbonate rocks is of great practical importance in the production of hydrocarbons and the injection of carbon dioxide into formations. Aim: The purpose of this article is to study the dissolution processes of carbonate samples in laboratory conditions using X-ray microcomputer-based tomography. Materials and methods: The study used 5 cylindrical carbonate samples, which were tested during the injection of hydrochloric acid solutions. Additional experimental and digital data from 8 samples are also used. The three-dimensional pore space of the samples was obtained using specialized software based on tomographic images. Results: The results obtained demonstrate the significance of the use of X-ray computed tomography for a deeper understanding of dissolution processes in geological and engineering studies. The study highlighted the complexity of the rock dissolution process, which depends on many factors. The created three-dimensional models of the samples allowed us to visualize wormholes, including branched and dominant wormholes. 3D imaging provided valuable information about changes in the pore structure of the samples before and after acid exposure. Conclusion: The results of this study highlight the importance of considering physical and structural properties when analyzing dissolution processes in carbonate samples. These data can have practical applications in the oil and gas industry, contributing to a more accurate understanding and optimization of the processes of interaction of acid solutions with carbonate samples.

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Study of the pore structure and calculation of macroscopic characteristics of rocks based on X-ray microcomputed tomography images

Bolysbek,

Kulzhabekov,

Bekbau

et al. 2023

Kazakhstan journal for oil & gas industry

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Background: Absolute and relative phase permeability and capillary pressure are important parameters in predicting oil and gas production from reservoirs, especially when acidizing the bottomhole zone of a well. They are mainly determined during long and resource-intensive laboratory experiments. Thus, additional approaches are required for the operational determination of the above parameters. The pore-network modeling based on microcomputed tomography data allows, firstly, to study the pore space of rock samples taking into account rock dissolution, secondly, to calculate the main macroscopic properties of rock samples without destroying them, and thirdly, to create a database of digital cores for further research Aim: Study of the pore space of two carbonate rock samples and the flow of fluids in them using the General Electric V|tome|X S240 MT and using the Avizo and PNFLOW software package. Materials and methods: This article uses microcomputed tomography with a spatial resolution of ~19 m and pore-network modeling of fluid flow in porous media to study the pore space of carbonate rock samples and determine absolute and phase permeabilities, as well as capillary pressure. Results: It is shown that an increase in the value of the Marker Extent parameter leads to a decrease in the number of pores and an overestimated absolute permeability due to improper pore separation, while a decrease in the value of this parameter made it possible to identify smaller pores. It is also shown that absolute permeability and porosity have different relationships before and after rock dissolution with high correlation coefficients that range from 0.62 to 0.81. It has been shown that rock dissolution will significantly affect the relative phase permeability of the samples. Conclusion: The dissolution of the rock led to a decrease in the residual oil saturation in both samples. In the case of oil displacement by water, as a result of rock dissolution, the residual oil saturation decreased from 38% to 22% and from 53% to 43% for the two samples under study. These results are important for understanding the flow of fluids in carbonate samples.

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Study of Carbonate Rock Dissolution Using X-Ray Microcomputed Tomography: Impact of Acid Flow Rate

Cited by 3 publications

References 12 publications

Experimental and Numerical Study of the Effect of Rock Dissolution on Absolute Permeability of Limestone Sub-Samples

Experimental and Numerical Study of the Effect of Rock Dissolution on Absolute Permeability of Limestone Sub-Samples

Experimental study of carbonate samples dissolution using X-ray microcomputer-based tomography

Study of the pore structure and calculation of macroscopic characteristics of rocks based on X-ray microcomputed tomography images

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