Impacts of Injection Induced Fractures Propagation in CO2 Geological Sequestration – Is Fracturing Good or Bad for CO2 Sequestration

Z, Luo; Bryant, Steven L.

doi:10.1016/j.egypro.2014.11.570

Cited by 9 publications

(3 citation statements)

References 5 publications

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“…Thus, detecting and characterising domains of intersecting fractures are important for the proper management of unconventional reservoirs. Furthermore, this kind of information is also crucial for the monitoring of CO 2 sequestration and nuclear waste storage, as these operations may fail due to leakage of fluids through connected fracture networks (Neuzil ; Luo and Bryant ). Apart from these, there are many other areas where the importance of detecting such fractured domains can be found, such as tunnel engineering, groundwater and contaminant hydrology, and mining engineering (e.g., Grenon and Hadjigeorgiou ; Lisjak, Figi, and Grasselli ; Karay and Hajnal ).…”

Section: Introductionmentioning

confidence: 99%

Effects of fracture intersections on seismic dispersion: theoretical predictions versus numerical simulations

Guo

Rubino

Glubokovskikh

et al. 2016

Geophysical Prospecting

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The detection and characterisation of domains of intersecting fractures are important goals in several disciplines of current interest, including exploration and production of unconventional reservoirs, nuclear waste storage, CO2 sequestration, and groundwater hydrology, among others. The objective of this study is to propose a theoretical framework for quantifying the effects of fracture intersections on the frequency‐dependent elastic properties of fluid‐saturated porous and fractured rocks. Three characteristic frequency regimes for fluid pressure communication are identified. In the low‐frequency limit, fractures are in full pressure communication with the embedding porous matrix and with other fractures. Conversely, in the high‐frequency limit, fractures are hydraulically isolated from the matrix and from other fractures. At intermediate frequencies, fractures are hydraulically isolated from the matrix porosity but can be in hydraulic communication with each other, depending on whether fracture sets are intersecting. For each frequency regime, the effective stiffness coefficients are derived using the linear‐slip theory and anisotropic Gassmann equations. Explicit mathematical expressions for the two characteristic frequencies that separate the three frequency regimes are also determined. Theoretical predictions are then applied to two synthetic 2D samples, each containing two orthogonal fracture sets: one with and another without intersections. The resulting stiffness coefficients, Thomsen‐style anisotropy parameters, and the transition frequencies show good agreement with corresponding numerical simulations. The theoretical results are applicable not only to 2D but also to 3D fracture systems and are amenable to being employed in inversion schemes designed to characterise fracture systems.

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Section: Introductionmentioning

confidence: 99%

Effects of fracture intersections on seismic dispersion: theoretical predictions versus numerical simulations

Guo

Rubino

Glubokovskikh

et al. 2016

Geophysical Prospecting

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show abstract

“…Thus, detecting and characterising domains of * E-mail: junxin.guo@postgrad.curtin.edu.au intersecting fractures are important for the proper management of unconventional reservoirs. Furthermore, this kind of information is also crucial for the monitoring of CO 2 sequestration and nuclear waste storage, as these operations may fail due to leakage of fluids through connected fracture networks (Neuzil 2013;Luo and Bryant 2014). Apart from these, there are many other areas where the importance of detecting such fractured domains can be found, such as tunnel engineering, groundwater and contaminant hydrology, and mining Fracture intersections and seismic dispersion 1265 engineering (e.g., Grenon and Hadjigeorgiou 2012;Lisjak, Figi, and Grasselli 2014;Karay and Hajnal 2015).…”

mentioning

confidence: 99%

Effects of Fracture Intersections on Seismic Dispersion - Theoretical Predictions Versus Numerical Simulations

Guo

Rubino

Gurevich

et al. 2016

78th EAGE Conference and Exhibition 2016

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The detection and characterisation of domains of intersecting fractures are important goals in several disciplines of current interest, including exploration and production of unconventional reservoirs, nuclear waste storage, CO 2 sequestration, and groundwater hydrology, among others. The objective of this study is to propose a theoretical framework for quantifying the effects of fracture intersections on the frequencydependent elastic properties of fluid-saturated porous and fractured rocks. Three characteristic frequency regimes for fluid pressure communication are identified. In the low-frequency limit, fractures are in full pressure communication with the embedding porous matrix and with other fractures. Conversely, in the high-frequency limit, fractures are hydraulically isolated from the matrix and from other fractures. At intermediate frequencies, fractures are hydraulically isolated from the matrix porosity but can be in hydraulic communication with each other, depending on whether fracture sets are intersecting. For each frequency regime, the effective stiffness coefficients are derived using the linear-slip theory and anisotropic Gassmann equations. Explicit mathematical expressions for the two characteristic frequencies that separate the three frequency regimes are also determined. Theoretical predictions are then applied to two synthetic 2D samples, each containing two orthogonal fracture sets: one with and another without intersections. The resulting stiffness coefficients, Thomsen-style anisotropy parameters, and the transition frequencies show good agreement with corresponding numerical simulations. The theoretical results are applicable not only to 2D but also to 3D fracture systems and are amenable to being employed in inversion schemes designed to characterise fracture systems.

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“…Later, by assuming a normal stress region ( σ v > σ H > σ h ) with isotropic horizontal stress distribution ( σ H = σ h ), Luo and Bryant modified their criteria for fracturing in horizontal wellbores and proposed the following equation: They also added a safety factor of 0.5 MPa to their constraint and suggested that P wf = P frac T – 0.5. In another work, Luo and Bryant proposed a single-phase flow injection induced fracture growth model to account for both poroelasticity and thermoelasticity. In their study, an elliptical three-region model was assumed that included an internal ellipse with cooled formation and separated from an outside cold CO 2 region with a sharp interface defined as “thermal front”, as well as a third outer region where the brine was separated from the cold CO 2 with a so-called “flood front”.…”

Section: Maximum Sustainable Pressure In Co2 Injectionmentioning

confidence: 99%

Well Injectivity during CO₂ Geosequestration: A Review of Hydro-Physical, Chemical, and Geomechanical Effects

et al. 2021

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Deep saline aquifers are among the most favorable geological sites for short-and long-term carbon geosequestration. Injection of CO 2 into aquifers causes various hydro-physical, chemical, and geomechanical interactions that affect the injectivity of wellbores. Despite the extensive research conducted on carbon capture and storage (CCS), there exists a lack of focus on the concept of injectivity. The present study aims to identify the gaps by reviewing the major factors contributing to CO 2 injectivity in deep saline aquifers. Moreover, the existing analytical and numerical mathematical models to estimate maximum sustainable injection pressure and pressure build-up are critically reviewed. Concerning the analytical models, the main controversies are related to the general shape of the CO 2 −brine interface that stems from neglecting or assuming CO 2 compressibility, mutual solubility of CO 2 and water, and drying-out effects. Besides, the models predicting waterflooding processes cannot accurately evaluate the injectivity of CO 2 due to the unique features of CO 2 . Furthermore, most models have concentrated on CO 2 storage capacity at the reservoir scale and not on wellbore injectivity. Thermo-poro-elastic effects influencing the in situ stresses and constraining the maximum sustainable injection pressures are also neglected in some cases. Despite the numerous numerical modeling workflows or tools, some mechanisms have not yet gained the desired attention, especially the chemical aspects of CO 2 -rich brine. Finally, while the field data demonstrate the applicability of CO 2 geosequestration in saline aquifers, regular wellbore injectivity monitoring and surveillance is deemed necessary.

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Impacts of Injection Induced Fractures Propagation in CO2 Geological Sequestration – Is Fracturing Good or Bad for CO2 Sequestration

Cited by 9 publications

References 5 publications

Effects of fracture intersections on seismic dispersion: theoretical predictions versus numerical simulations

Effects of fracture intersections on seismic dispersion: theoretical predictions versus numerical simulations

Effects of Fracture Intersections on Seismic Dispersion - Theoretical Predictions Versus Numerical Simulations

Well Injectivity during CO₂ Geosequestration: A Review of Hydro-Physical, Chemical, and Geomechanical Effects

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Impacts of Injection Induced Fractures Propagation in CO2 Geological Sequestration – Is Fracturing Good or Bad for CO2 Sequestration

Cited by 9 publications

References 5 publications

Effects of fracture intersections on seismic dispersion: theoretical predictions versus numerical simulations

Effects of fracture intersections on seismic dispersion: theoretical predictions versus numerical simulations

Effects of Fracture Intersections on Seismic Dispersion - Theoretical Predictions Versus Numerical Simulations

Well Injectivity during CO2 Geosequestration: A Review of Hydro-Physical, Chemical, and Geomechanical Effects

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Product

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Well Injectivity during CO₂ Geosequestration: A Review of Hydro-Physical, Chemical, and Geomechanical Effects