A Review of Coupled Geo-Chemo-Mechanical Impacts of CO2-Shale Interaction on Enhanced Shale Gas Recovery

Liu, Danqing; Yang, Sen; Li, Yilian; Agarwal, Ramesh K.

doi:10.1007/978-3-030-29298-0_6

Cited by 3 publications

(3 citation statements)

References 90 publications

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“…Fracturing of unconventional rock formations using nonaqueous fluid such as SC-CO 2 has several advantages over fracturing based on aqueous fluids: Low viscosity and high diffusivity of SC-CO 2 fluid makes it comparatively easier than aqueous fluids to generate complex fracture networks; − Sharp alleviation of formation damage due to high flow-back rate and little swelling of clay, in comparison to hydraulic fracturing; Enhanced production due to its higher adsorption capacity to shale than CH 4 , resulting in the displacement of preadsorbed CH 4 ; , Minimizes environmental pollution and saves precious water resources. ,, Figure displays the advantages that SC-CO 2 -based fracturing has over hydraulic fracturing and how SC-CO 2 saturation brings changes in the physio-chemo-mechanical properties of shales. Zhang et al conducted the simulation experiment to study SC-CO 2 fracturing in shales.…”

Section: Sc–co2-based Fracturingmentioning

confidence: 99%

Impact of Supercritical CO₂ on Shale Reservoirs and Its Implication for CO₂ Sequestration

et al. 2022

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Hydraulic fracturing has transformed the international energy landscape by becoming the go-to method for the exploitation of natural gas from unconventional shale reservoirs. However, in the recent years, the search for an alternative method of shale-gas exploration has intensified, because of various problems (e.g., contamination of ground and surface water, overexploitation of precious water resources, air pollution, etc.) associated with the usage of water-based fracturing techniques. The use of CO2 for shale gas exploitation has emerged as a better alternative to aqueous-based gas exploration techniques. CO2 when injected into deep shale reservoirs, transitions into supercritical CO2 (SC-CO2) when temperature and pressure condition exceeds the critical point, i.e., 31.1 °C and 7.38 MPa. In this paper, we comprehensively review the impact of SC-CO2 on shale gas reservoirs during the different stages of shale-gas exploration, i.e., (i) drilling, which involves the superiority of SC-CO2 over water-based drilling fluids, in terms of achieving under-balanced well condition, higher rates of penetration, and resistance to formation damage; (ii) fracturing, which involves factors affecting the tortuosity of fractures created by SC-CO2 fracturing, breakdown pressure, and proppant-carrying capacity; and (iii) injection, which involves the twin-headed benefit of enhanced recovery due to CO2/CH4 competitive adsorption and geological sequestration, CO2 vs CH4 excess sorption as a function of pressure, etc. Several research works have indicated discrepancies on how SC-CO2 impacts different shale properties. Some studies show low-pressure N2-gas-adsorption-derived surface area and total pore volume to be increasing with SC-CO2 imbibition, while others show a decreasing trend for the same. Similarly, for some shales, the quartz content, along with the clay mineral contents, decreased as the exposure to SC-CO2 increased, while in some other studies, with similar long-term exposure to SC-CO2, the quartz content was observed to increase along with the decrease in clay content and vice versa. Essentially, the increased exposure to SC-CO2 results in the dissolution of primary porous structures and fractures, and reformation of newer porous structure and conduits in shales. Nonetheless, these changes in the mineralogy weaken the microstructure of the rock bringing significant changes in the mechanical properties of the shales with implications on the wellbore stability and fracturing efficiency. The mechanical properties such as uniaxial compressive strength (UCS), Young’s modulus, and tensile strength decrease as the SC-CO2 saturation period increases. However, some studies have shown factors like bedding angle and phase-state of CO2 having varying effect on the strength behavior of the shales. Moreover, changes in the structure of shales caused by the creation of fractures and the reduction of their strength can also pose major risks, because of potential leakage of CO2 through these created pathways. How these processes would i...

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Section: Sc–co2-based Fracturingmentioning

confidence: 99%

Impact of Supercritical CO₂ on Shale Reservoirs and Its Implication for CO₂ Sequestration

et al. 2022

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“…According to the calculation of overseas research institutions, carbon utilization and storage theoretically has the potential to solve 62% of the global carbon dioxide emissions and has great development potential [12]. In recent years, the research on CO 2 geological utilization and storage technology mainly focuses on CO 2 injection and production optimization, well location optimization and leakage mitigation [9]. How to maximize CO 2 utilization and oil and gas reservoir recovery, maximize economic benefits and maximize buried stock is the direction and problem that still needs to be studied [7].…”

Section: Introductionmentioning

confidence: 99%

Carbon Dioxide Geological Utilization and Storage: A Bibliometric and Patent Analysis

Xu¹,

Lin²,

Zhou³

et al. 2023

Advances in Computer Science Research

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Due to the increasing trend of global warming caused by man-made carbon dioxide emissions, people pay more and more attention to this problem. Anthropogenic carbon dioxide emissions have promoted the progress of global carbon use and storage (CUS) projects. Taking Incopat, Scopus and Web of Science databases as data sources, this study identified 1281 patents and 6435 research papers. Using bibliometric methods and knowledge maps, it quantitatively visualized the distribution of research institutions, cooperative research networks, keyword co-occurrence networks and research performance, and showed the current research pattern and future research direction of carbon dioxide geological utilization and storage technology. The results show that:(1) Carbon dioxide geological utilization and storage technology (CGUS) research hotspots mainly focus on CO2 enhanced oil exploitation technology (EOR), CO2 geological storage, CO2 enhanced natural gas, shale gas exploitation (EGR), Ocean storage, and other technologies; (2) Developed countries such as the United States and the United Kingdom have taken the lead in carrying out research on CGUS. China's follow-up research has become an absolute force in global technology research and development, with the highest number of patent applications and academic papers published. However, international cooperation should be further strengthened to improve research performance; (3) At present, the research on carbon dioxide utilization and storage technology is in a period of vigorous development. The research reputation is high, and the research fields show a trend of cross integration, mainly distributed in Environmental Science, geology, energy science and engineering. Finally, research directions of Carbon dioxide geological utilization and storage technology are proposed to provide a reference for future research.

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“…The flow characteristics of fluids in pores have been studied extensively (Driskill et al, 2013;Ren et al, 2015;Bi, 2018). You et al studied the flow rule of nC8 in quartz pores under the condition of water film through molecular dynamics, and found that layered structures were formed on the surface of quartz pores and liquid-liquid slip occurred at the oil-water interface, revealing the migration mechanism of oil in quartz pores under the condition of water film (Zhou et al, 2017;Liu et al, 2019). By analyzing a variety of cationic surfactants, Yang et al studied their adsorption mechanism on the quartz surface and found that a double-layer structure was formed at the critical micelle concentration, indicating that the surfactant affected the properties of the cationic adsorption film on the quartz surface (Wu et al, 2017;Su et al, 2019;Hou, 2020).…”

Section: Introductionmentioning

confidence: 99%

Fracturing fluid flow characteristics in shale gas matrix-fracture system based on NMR method

Wu,

Yang,

et al. 2023

Front. Energy Res.

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To understand the occurrence state of fracturing fluid in shale gas matrix-fracture system, an experimental method for evaluating fracturing fluid flow characteristics in matrix-fracture system was established. By using Nuclear Magnetic Resonance method, the flow characteristics of fracturing fluid were investigated from three processes of filtration, well shut-in and flowback. The T2 spectrum of fracturing fluid flow process and fracturing fluid saturation in matrix-fracture core model were clarified. The results demonstrate that the peak area of T2 spectra increases gradually during the filtration process, and the fracturing fluid quickly fills the fractures and matrix pores. During the well shut-in process, the fracturing fluid gradually flows from the fracture space to the matrix pores, and the signal of the matrix pores increases by 50.5%. During the flowback process, fracturing fluid flows out of the matrix and fracture. And when it reaches a stable state, the peak signal in the fracture decreases by 64.5% and the matrix signal reduces by 18.8%. The better the porosity and permeability characteristics of the core, the more likely the fracturing fluid is to stay in the formation and cannot be discharged. This paper would contribute to basic parameters for shale gas fracturing design and production strategy optimization.

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A Review of Coupled Geo-Chemo-Mechanical Impacts of CO2-Shale Interaction on Enhanced Shale Gas Recovery

Cited by 3 publications

References 90 publications

Impact of Supercritical CO₂ on Shale Reservoirs and Its Implication for CO₂ Sequestration

Impact of Supercritical CO₂ on Shale Reservoirs and Its Implication for CO₂ Sequestration

Carbon Dioxide Geological Utilization and Storage: A Bibliometric and Patent Analysis

Fracturing fluid flow characteristics in shale gas matrix-fracture system based on NMR method

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A Review of Coupled Geo-Chemo-Mechanical Impacts of CO2-Shale Interaction on Enhanced Shale Gas Recovery

Cited by 3 publications

References 90 publications

Impact of Supercritical CO2 on Shale Reservoirs and Its Implication for CO2 Sequestration

Impact of Supercritical CO2 on Shale Reservoirs and Its Implication for CO2 Sequestration

Carbon Dioxide Geological Utilization and Storage: A Bibliometric and Patent Analysis

Fracturing fluid flow characteristics in shale gas matrix-fracture system based on NMR method

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Product

Resources

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Impact of Supercritical CO₂ on Shale Reservoirs and Its Implication for CO₂ Sequestration

Impact of Supercritical CO₂ on Shale Reservoirs and Its Implication for CO₂ Sequestration