Formation damage induced by clay colloids deposition in Triassic clastic geothermal fields: Insights from an experimental approach

Ines, Raies; Eric, Kohler; Marc, Fleury; Nicolas, Pédel; Béatrice, Ledésert

doi:10.1016/j.clay.2023.106868

Cited by 5 publications

(2 citation statements)

References 41 publications

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“…In detrital geothermal reservoirs (sandstones, conglomerates), injectivity decline problems are often encountered during water reinjection into the subsurface, despite massive surface filtration. The reinjected water carries only nano-sized particles, like illite, at relatively low concentrations but causes severe permeability impairment due to pore clogging by the transported particles [122,123]. Nuclear Magnetic Resonance (NMR) is a powerful method to evaluate the clogging phenomena [124,125].…”

Section: Discussionmentioning

confidence: 99%

The use of newly formed minerals to characterize geothermal reservoirs and their cap rock: examples from intracontinental extensional basins and volcanic islands in subduction context

Ledésert

2023

Preprint

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Geothermal energy aims at harnessing the heat of the Earth to produce energy, from the near-surface to great depths. Emphasis is put on geothermal reservoirs in crystalline rocks, hence vol-canic islands and crystalline basements of sedimentary basins based on three examples world-wide. Hot brines circulate in those rocks and are responsible for their hydrothermal alteration because of fluid-rock interactions. This includes dissolution of preexisting minerals and crystal-lization of newly formed ones which provide many information of crucial importance for a better exploration of those reservoirs. For example, the crystallization of clay minerals results from the dissolution of preexisting minerals (feldspar and ferro-magnesian minerals in plutonic, volcanic or metamorphic rocks) or from the direct precipitation from geothermal brines, in specific condi-tions. Clay minerals are found in both the geothermal reservoirs and in the clay-cap found above them. Other newly formed minerals such as quartz, carbonates or sulfates have also recorded the conditions of temperature and salinity encountered by fossil reservoirs which can be evaluated thanks to the study of fluid inclusions trapped during their crystallization. This paper presents results from several geothermal deep sites and surface analogues to pinpoint the role played by newly-formed minerals in the characterization of geothermal reservoirs and their cap-rock.

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Section: Discussionmentioning

confidence: 99%

The use of newly formed minerals to characterize geothermal reservoirs and their cap rock: examples from intracontinental extensional basins and volcanic islands in subduction context

Ledésert

2023

Preprint

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“…As shown in the Figure 15, scale particles in the front section of the chip are transported toward the middle and rear sections by the carrying effect of injected water. Primary scale particles combine with transported scale particles, 54 forming larger particles that block the middle and rear sections of the chip. This leads to a greater increase in particle size, which is consistent with the phenomenon of a sudden decrease in NMR signals in the rear section of the core during the late stage of water injection.…”

Section: Microfluidic Experimental Researchmentioning

confidence: 99%

The Reservoir Injury Rules of Water Injection to an Ultralow Permeability Reservoir: Experimental Research Based on Core-NMR and Microfluidic Technology

Zhu,

Tang,

et al. 2024

Energy Fuels

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Water flooding is one of the important methods for developing ultralow permeability reservoirs. However, due to the high clay mineral content in these reservoirs and poor compatibility between injected water and formation fluids (such as formation water), the reservoirs suffer damage. Previous studies have lacked research on the dynamic damage patterns of internal structures during the water flooding process in ultralow permeability cores. Addressing this, this study focuses on an ultralow permeability reservoir in northwest China, analyzing the pore-permeability characteristics, pore structures, and clay mineral composition of core samples. Using core nuclear magnetic resonance displacement technology, it examines microstructural changes in pore spaces at various locations and employs microfluidic experimental techniques to replicate the transport behavior of scale particles during water flooding in low permeability porous media. Together, these findings reveal the damage mechanisms of this ultralow permeability reservoir, where free particles migrate with injected water to clog the rear part of the reservoir, significantly reducing the reach of the water flood. Therefore, for the water injection development of low-permeability oil reservoirs, attention should be paid to improving the quality of the injected water. Functional chemicals such as scale inhibitors and clay stabilizers should be added to the injected water in advance, and reservoir modification operations such as acidizing and fracturing should be carried out promptly. This minimizes the damage of these free particles to the deep reservoir and increases the sweep efficiency of water flooding.

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Particulate transport in porous media at pore-scale. Part 2: CFD-DEM and colloidal forces

Maya Fogouang,

André,

Leroy

et al. 2024

Journal of Computational Physics

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Formation damage induced by clay colloids deposition in Triassic clastic geothermal fields: Insights from an experimental approach

Cited by 5 publications

References 41 publications

The use of newly formed minerals to characterize geothermal reservoirs and their cap rock: examples from intracontinental extensional basins and volcanic islands in subduction context

The use of newly formed minerals to characterize geothermal reservoirs and their cap rock: examples from intracontinental extensional basins and volcanic islands in subduction context

The Reservoir Injury Rules of Water Injection to an Ultralow Permeability Reservoir: Experimental Research Based on Core-NMR and Microfluidic Technology

Particulate transport in porous media at pore-scale. Part 2: CFD-DEM and colloidal forces

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