Effects of Supercritical CO<sub>2</sub> Injection on the Shale Pore Structures and Mass Transport Rates

Medina, Bryan X.; Kohli, Arjun H.; Kovscek, A. R.; Alvarado, Vladimir

doi:10.1021/acs.energyfuels.2c02254

Cited by 5 publications

(5 citation statements)

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“…Geochemical reactions arising from the dissolution of scCO 2 in brine have been experimentally proven to impact the microstructure of storage zones [89][90][91] and confining zones [60,69,73,[92][93][94][95][96][97][98] even at short treatment times of typically few weeks. The impact on storage zones is commonly observed by dynamic injection flooding of scCO 2 -enriched brine in limestone core samples.…”

Section: Discussionmentioning

confidence: 99%

“…Recent studies have evaluated the role of geochemical alterations induced by scCO2brine interactions in the capillary properties of the storage zone [89][90][91] and confining zone [60,69,73,[92][93][94][95][96][97][98]. Due to their high reactivity, limestones are generally the storage rock of focus, given that the reactivity of sandstones (mainly quartz) is extremely slow and pH-independent [16,83].…”

Section: Introductionmentioning

confidence: 99%

“…A secondary alteration of feldspars can occur when the concentration of calcium ions deriving from the dissolution of carbonates plus originally occurring in the brine is considerable [80,88]. An example is the dissolution of albite consuming Ca 2+ and leading to the precipitation of calcite and kaolinite [80]: Recent studies have evaluated the role of geochemical alterations induced by scCO 2 -brine interactions in the capillary properties of the storage zone [89][90][91] and confining zone [60,69,73,[92][93][94][95][96][97][98]. Due to their high reactivity, limestones are generally the storage rock of focus, given that the reactivity of sandstones (mainly quartz) is extremely slow and pH-independent [16,83].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Geochemical Reactivity on ScCO2–Brine–Rock Capillary Displacement: Implications for Carbon Geostorage

Cruz,

Dang,

Curtis

et al. 2023

Energies

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The displacement efficiency of supercritical CO2 (scCO2) injection in the storage zone and its primary trapping mechanism in the confining zone are strongly tied to the capillary phenomenon. Previous studies have indicated that the capillary phenomenon can be affected by geochemical reactivity induced by scCO2 dissolution in formation brine. To quantify such changes, thin disk samples representing a sandstone storage reservoir, siltstone confining zone, and mudstone confining zone were treated under a scCO2-enriched brine static condition for 21 days at 65 °C and 20.7 MPa. Geochemical alterations were assessed at the surface level using scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy and X-ray fluorescence. Before and after treatment, the wettability of the scCO2–brine–rock systems was determined using the captive-bubble method at fluid-equilibrated conditions. Pore size distributions of the bulk rocks were obtained with mercury injection capillary pressure, nuclear magnetic resonance, and isothermal nitrogen adsorption. The results indicate the dissolution of calcite at the surface, while other potentially reactive minerals (e.g., clays, feldspars, and dolomite) remain preserved. Despite alteration of the surface mineralogy, the measured contact angles in the scCO2–brine–rocks systems do not change significantly. Contact angle values of 42 ± 2° for sandstone and 36 ± 2° for clay-rich siltstone/calcite-rich mudstone were determined before and after treatment. The rocks studied here maintained their water-wettability at elevated conditions and after geochemical reactivity. It is also observed that surface alteration by geochemical effects did not impact the pore size distributions or porosities of the thin disk samples after treatment. These results provide insights into understanding the impact of short-term geochemical reactions on the scCO2–brine capillary displacement in the storage zone and the risks associated with scCO2 breakthrough in confining zones.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Geochemical Reactivity on ScCO2–Brine–Rock Capillary Displacement: Implications for Carbon Geostorage

Cruz,

Dang,

Curtis

et al. 2023

Energies

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“…When CO 2 dissolves with water, a carbonic acid solution is created, from which hydrogen ion dissociates, reduces the pH of the solution as discussed in equation . ,, Shales with a high percentage of clay mineral release more water when interacting with Sc-CO 2 to produce carbonic acid. ,,,,,− Every shale is composed of different minerals that react differently when they interact with Sc-CO 2 and water; consequently, it changes the overall composition of rock.…”

Section: Interaction Of Sc-co2 With Shalementioning

confidence: 99%

Supercritical Carbon Dioxide Utilization for Hydraulic Fracturing of Shale Reservoir, and Geo-Storage: A Review

Gupta,

Verma

2023

Energy Fuels

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Hydraulic fracturing has completely revolutionized how shale resources are exploited to extracthydrocarbons. However, sustainability and environmental issues have fueled the desire for alternate fracturing technologies. Supercritical carbon dioxide (Sc-CO2) fracturing is a new method that uses high-pressure, high-temperature CO2 in its supercritical state (7.38 MPa and 31.1 °C) to generate fractures in shale formations, thereby increasing reservoir permeability. This Review thoroughly analyzes the effects of Sc-CO2 on shale reservoirs during the fracturing process, including the factors that affect fracture breakdown pressure and the complexity and roughness of fracture induced by Sc-CO2. Sc-CO2 can fracture rock at a fracturing pressure lower than that of slick water. CO2, in its supercritical state, shows strong permeability, low viscosity, and extremely low surface tension, like gas, because of which it can infiltrate any space larger than its kinetic diameter (0.330 nm). Many research investigations illustrate how Sc-CO2 affects shales with diverse pore structures, mineral compositions, and mechanical properties when exposed to Sc-CO2 for several hours to days. It is challenging to effectively store CO2 in shale gas reservoirs due to their low permeability and limited storage capacity. To improve the effectiveness of CO2 storage, shale can be fractured to increase the pore space and surface area in reservoirs. Thereby, a certain amount of the CO2 pumped for shale gas production can be securely stored in shale formations, reducing carbon emissions and allowing for a zero-carbon footprint. This paper discusses the pathway and different chemical reactions involved in the storage of CO2 after fracturing over a period. However, fully understanding the interactions between Sc-CO2 and shale rock and the possibility of long-term storage of CO2 in shale formations is quite challenging. It is because of a lack of research and limited knowledge in the above field. Hence, more investigation and development are required in the research area of Sc-CO2 fracturing and the interaction of CO2 with shale rock.

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“…They turn them into icy crystals (hydrates) and store them into rocks. Medina et al 34 shows that supercritical (sc)-CO 2 injection affects shale differently depending upon its composition. Wolfcamp shales (high carbonate) show an increased pore volume, which is potentially good for storage.…”

Section: Introductionmentioning

confidence: 99%

Perspectives of CO₂ Injection Strategies for Enhanced Oil Recovery and Storage in Indian Oilfields

Bera,

Satapathy,

Daneti

2024

Energy Fuels

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The motivation behind the advancement of novel technologies for enhanced oil recovery (EOR) originates from the increasing energy demand and imperative to explore new oil reserves. Novel approaches, including the injection of carbon dioxide (CO 2 ) and sequestration of CO 2 in oil reservoirs, have emerged as potential remedies. In response to the rising apprehensions regarding global warming attributed to anthropogenic activities and the consequent rise in CO 2 emissions, scholars are directing their attention toward the utilization of CO 2 sequestration methods for EOR. This methodology presents an achievable strategy to reduce anthropogenic CO 2 emissions and diminish their influence on the atmosphere. The implementation of CO 2 sequestration in EOR operations has the potential to yield the dual benefits of cost reduction and additional oil recovery. The paper presents a study that investigates distinct scenarios of CO 2 injection and sequestration in various formations. The study incorporates conventional methodologies, such as gas injection, for the purpose of EOR. It explores diverse fields of CO 2 injection and sequestration, deliberates on the decision-making process concerning injection strategies, and employs dynamic as well as static models to generate long-term production profiles, evaluate production profiles, and manage the process. The paper explores the challenges encountered by various industries in the process of capturing, transporting, and storing of CO 2 in geological formations. Additionally, the study assesses the geological potential and practicality of implementing this methodology in India. In brief, this study presents a thorough examination of Indian scenarios for CO 2 injection and sequestration utilized in EOR techniques.

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Effects of Supercritical CO₂ Injection on the Shale Pore Structures and Mass Transport Rates

Cited by 5 publications

References 32 publications

Effect of Geochemical Reactivity on ScCO2–Brine–Rock Capillary Displacement: Implications for Carbon Geostorage

Effect of Geochemical Reactivity on ScCO2–Brine–Rock Capillary Displacement: Implications for Carbon Geostorage

Supercritical Carbon Dioxide Utilization for Hydraulic Fracturing of Shale Reservoir, and Geo-Storage: A Review

Perspectives of CO₂ Injection Strategies for Enhanced Oil Recovery and Storage in Indian Oilfields

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Effects of Supercritical CO2 Injection on the Shale Pore Structures and Mass Transport Rates

Cited by 5 publications

References 32 publications

Effect of Geochemical Reactivity on ScCO2–Brine–Rock Capillary Displacement: Implications for Carbon Geostorage

Effect of Geochemical Reactivity on ScCO2–Brine–Rock Capillary Displacement: Implications for Carbon Geostorage

Supercritical Carbon Dioxide Utilization for Hydraulic Fracturing of Shale Reservoir, and Geo-Storage: A Review

Perspectives of CO2 Injection Strategies for Enhanced Oil Recovery and Storage in Indian Oilfields

Contact Info

Product

Resources

About

Effects of Supercritical CO₂ Injection on the Shale Pore Structures and Mass Transport Rates

Perspectives of CO₂ Injection Strategies for Enhanced Oil Recovery and Storage in Indian Oilfields