Effects of CO2 Compressibility on CO2 Storage in Deep Saline Aquifers

Vilarrasa, Víctor; Bolster, Diogo; Dentz, Marco; Olivella, S.; Carrera, Jesús

doi:10.1007/s11242-010-9582-z

Cited by 94 publications

(88 citation statements)

References 48 publications

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“…17 In addition, the validity and the applicability of both solutions has been discussed in. [21][22][23] The interface solutions derived by Nordbotten et al, 16 denoted by NB, and Dentz and Tartakovsky, 17 denoted by DZ, are written as follows:…”

Section: Caprock Deflection Induced By Co 2 Injectionmentioning

confidence: 99%

“…We further account for the pressure-dependent CO 2 density and viscosity according to Peng and Robinson 24 and Fenghour et al, 25 respectively, through the iterative methodology proposed by Vilarrasa et al 23 Inserting interface Eqs. (18) and (19) into the integration of Darcy's law results in the derivation of two vertically averaged overpressure expressions with the zeroth-order Hankel transformation.…”

Section: Caprock Deflection Induced By Co 2 Injectionmentioning

confidence: 99%

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A hydromechanical approach to assess CO2 injection-induced surface uplift and caprock deflection

Barès

Laloui

2015

Geomechanics for Energy and the Environment

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h i g h l i g h t s• A semi-analytical solution is proposed to assess CO 2 injection in deformable medium.• Good agreement is found between the proposed solution and the finite element method.• Geomechanical interactions between a caprock and adjacent regions are examined.• The surface uplift measured at In Salah can be reproduced by the proposed solution.a r t i c l e i n f o b s t r a c tThis study focuses on the derivation of a semi-analytical approach for the evaluation of surface uplift and caprock deflection induced by underground injection of CO 2 . The adopted methodology includes the development of a mathematical model that incorporates the deformable behaviour of the storage reservoir and the flow of two immiscible fluids (CO 2 and brine) within the aquifer while the surface rock or the caprock layer is modelled as a thin plate. Governing equations are solved for the axisymmetric flexural deflection due to a constant rate of CO 2 injection. Both developed solutions are applied to a representative CO 2 storage case solved numerically by the finite element method, and good agreement between results is observed. When benchmarking to the In Salah surface uplift, the developed semi-analytical approach can capture a high rate of surface uplift caused by the pressure build-up during the early stage of CO 2 injection. The required calculation time is very short compared to a classical finite element approach. This method can be employed as a design tool for the analysis of uncertainty in parameters such as the injection rate, porosity, rock properties and geological structures. This semi-analytical approach also provides an efficient means of estimating the influence of high injection rates of CO 2 on surface uplift.

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Section: Caprock Deflection Induced By Co 2 Injectionmentioning

confidence: 99%

Section: Caprock Deflection Induced By Co 2 Injectionmentioning

confidence: 99%

A hydromechanical approach to assess CO2 injection-induced surface uplift and caprock deflection

Barès

Laloui

2015

Geomechanics for Energy and the Environment

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“…Fluid pressure evolution was calculated analytically by Mathias et al [19] based on the analytical solution of Nordbotten et al [20] for the CO 2 plume position. Vilarrasa et al [21] also derived the fluid pressure evolution resulting from the analytical solutions for the CO 2 plume position of Nordbotten et al [20] and Dentz and Tartakovsky [22], and incorporated a correction in these solutions to account for CO 2 compressibility. In all cases, fluid pressure was predicted to monotonically build up with time as a result of CO 2 injection at a constant mass flow rate.…”

Section: Introductionmentioning

confidence: 99%

Two-phase flow effects on the CO₂injection pressure evolution and implications for the caprock geomechanical stability

2016

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Abstract. Geologic carbon storage is considered to be one of the main solutions to significantly reduce CO2 emissions to the atmosphere to mitigate climate change. CO2 injection in deep geological formations entails a twophase flow, being CO2 the non-wetting phase. One of the main concerns of geologic carbon storage is whether the overpressure induced by CO2 injection may compromise the caprock integrity and faults stability. We numerically investigate the two-phase flow effects that govern the overpressure evolution generated by CO2 injection and how this overpressure affects the caprock geomechanical stability. We find that fluid pressure increases sharply at the beginning of injection because CO2 has to displace the brine that fills the pores around the injection well, which reduces the relative permeability. However, overpressure decreases subsequently because once CO2 fills the pores around the injection well, CO2 can flow easily due to its low viscosity and because the relative permeability to CO2 increases. Furthermore, the pressure drop that occurs in the capillary fringe due to two-phase flow interference decreases as the CO2 plume becomes larger. This overpressure evolution induced by CO2 injection, which remains practically constant with time after the initial peak, is very beneficial for maintaining caprock stability. Thus, the sealing capacity of the caprock will be maintained, preventing CO2 leakage to occur across the caprock.

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“…Whereas most work on VE models for CO 2 storage so far has considered constant CO 2 density, there has also been some work on the inclusion of compressibility effects at the large scale (Vilarrasa et al 2010) and the wellbore scale (Mijic et al 2014). Villarasa et al proposed a method to include variable CO 2 density (and viscosity) in an analytic VE model (Vilarrasa et al 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Villarasa et al proposed a method to include variable CO 2 density (and viscosity) in an analytic VE model (Vilarrasa et al 2010). Under this approach, the density of injected CO 2 is allowed to vary in time, while remaining constant in space.…”

Section: Introductionmentioning

confidence: 99%

Vertically Averaged Equations with Variable Density for $$\hbox {CO}_2$$ CO 2 Flow in Porous Media

2014

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Carbon capture and storage has been proposed as a viable option to reduce CO 2 emissions. Geological storage of CO 2 where the gas is injected into geological formations for practically indefinite storage, is an integral part of this strategy. Mathematical models and numerical simulations are important tools to better understand the processes taking place underground during and after injection. Due to the very large spatial and temporal scales involved, commercial 3D-based simulators for the petroleum industry quickly become impractical for answering questions related to the long-term fate of injected CO 2 . There is an interest in developing simplified modeling tools that are effective for this type of problem. One approach investigated in recent years is the use of upscaled models based on the assumption of vertical equilibrium (VE). Under this assumption, the simulation problem is essentially reduced from 3D to 2D, allowing much larger models to be considered at the same computational cost. So far, most work on VE models for CO 2 storage has either assumed incompressible CO 2 or only permitted lateral variations in CO 2 density (semi-compressible). In the present work, we propose a way to fully include variable CO 2 density within the VE framework, making it possible to also model vertical density changes. We derive the fine-scale and upscaled equations involved and investigate the resulting effects. In addition, we compare incompressible, semi-compressible, and fully compressible CO 2 flow for some model scenarios, using an in-house, fully-implicit numerical code based on automatic differentiation, implemented using the MATLAB reservoir simulation toolkit.

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Effects of CO2 Compressibility on CO2 Storage in Deep Saline Aquifers

Cited by 94 publications

References 48 publications

A hydromechanical approach to assess CO2 injection-induced surface uplift and caprock deflection

A hydromechanical approach to assess CO2 injection-induced surface uplift and caprock deflection

Two-phase flow effects on the CO₂injection pressure evolution and implications for the caprock geomechanical stability

Vertically Averaged Equations with Variable Density for $$\hbox {CO}_2$$ CO 2 Flow in Porous Media

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Effects of CO2 Compressibility on CO2 Storage in Deep Saline Aquifers

Cited by 94 publications

References 48 publications

A hydromechanical approach to assess CO2 injection-induced surface uplift and caprock deflection

A hydromechanical approach to assess CO2 injection-induced surface uplift and caprock deflection

Two-phase flow effects on the CO2injection pressure evolution and implications for the caprock geomechanical stability

Vertically Averaged Equations with Variable Density for $$\hbox {CO}_2$$ CO 2 Flow in Porous Media

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Two-phase flow effects on the CO₂injection pressure evolution and implications for the caprock geomechanical stability