Influence of CO2 injection on the poromechanical response of Berea sandstone

Tarokh, Ali; Makhnenko, Roman Y.; Kim, Kiseok; Zhu, Xuan; Popovics, John S.; Šegvić, Branimir; Sweet, Dustin E.

doi:10.1016/j.ijggc.2020.102959

Cited by 23 publications

(21 citation statements)

References 67 publications

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“…It is observed that CO2 treatment promotes sandstone's viscous compaction resulting in the decrease of bulk viscosity value by more than a half, from 1.4×10 16 Pa•s to 6.8×10 15 Pa•s. A similar effect is observed at P' = 1 MPa [18]. Furthermore, the measurements of volume strain along with the pore pressure buildup during the longterm response allow the validation of the constitutive model.…”

Section: Time-dependent Deformationsupporting

confidence: 63%

“…The effect of CO2 injection not only on the poroelastic, but also on the viscoelastic properties needs to be studied for any potential reservoir rock. The bulk viscosity remains to be strongly effective stress dependent after the CO2 treatment, but the CO2 treated damaged Berea sandstone is noticeably more prone to time-dependent deformation in comparison to the pristine and damaged states [18]. Interestingly, previous studies on reservoir materials show, in general, little effect of CO2 injection on induced creep in silica-rich rock, including Berea sandstone [11,26].…”

Section: Time-dependent Deformationmentioning

confidence: 92%

“…The material exhibits slight elastic anisotropy (5-7%) due to the existence of bedding planes. The onset of inelastic response that induces significant microseismicity is characterized by the deviatoric loading above 70% of the material strength, which is reported to be 30-32 MPa under the uniaxial compression conditions [18]. The strength characteristics measured under drained (or dry) and undrained conditions are the same given the effect of the effective mean stress on rock failure being considered [19].…”

Section: Methodsmentioning

confidence: 99%

“…The change in total mean stress is ΔP = (2+2ν)Δσlat/3 for the drained condition and ΔP = (2+2νu)Δσlat/3 for the undrained case. Dry Poisson's ratio is measured in the uniaxial compression test [18] and the undrained Poisson's ratio νu is calculated from Equation (9). Here, the unjacketed bulk modulus is taken as Ks' =30 GPa [24].…”

Section: Saturation and Co2 Treatmentmentioning

confidence: 99%

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Evolution of poroviscoelastic properties of silica-rich rock after CO₂ injection

Kim

Makhnenko

2020

E3S Web Conf.

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Injection of CO2 into the subsurface requires consideration of the poromechanical behavior of reservoir rock saturated with aqueous fluid. The material response is usually assumed to be elastic, to avoid consideration of induced seismicity, or viscoelastic, if long-term deformations are needed to be taken into the account. Both elastic and viscous behavior may be influenced by the chemical reactions that are caused by the acidic mixture formed as high-pressure CO2 enters the pore space saturated with aqueous fluid. In this study, we conduct laboratory experiments on a fluid-saturated porous rock - Berea sandstone, and evaluate its poromechanical properties. Subsequently, the specimens are treated with liquid CO2 for 21 days and the corresponding variations in their properties are determined. The constitutive model considering the elastic time-dependent behavior of porous rock is validated by comparing the measured and predicted specimen deformation. Presented data indicate that the effect of CO2 injection on the long-term response is more significant compared to the short-term response. It is suggested for the constitutive models that predict long-term reservoir behavior during CO2 storage to include not only the poroelastic response and its change due to treatment, but also the time-dependent deformation and its evolution caused by the changes in chemistry of the pore fluid.

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Section: Time-dependent Deformationsupporting

confidence: 63%

Section: Time-dependent Deformationmentioning

confidence: 92%

Section: Methodsmentioning

confidence: 99%

Section: Saturation and Co2 Treatmentmentioning

confidence: 99%

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Evolution of poroviscoelastic properties of silica-rich rock after CO₂ injection

Kim

Makhnenko

2020

E3S Web Conf.

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“…This rock, quarried from Berea, Ohio, is a fine-grained sandstone composed mainly (~95% of solid volume) of sub-rounded to rounded quartz grains. Other constituent minerals include kaolinite (2%), microcline (1.5%), and muscovite (1.2%) 17,18,19 . The sandstone sample was mounted on the stable frame of a nano-positioner stage ( Fig.1).…”

Section: Methodsmentioning

confidence: 99%

Nanometer-Scale Deformations of Berea Sandstone Under Moisture-Content Variations

et al. 2020

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Sandstone mechanical stability is of key concern in projects involving injections of CO2 in sandstone geological reservoirs, for the purpose of long-term storage. We developed a method to measure nanometer-scale deformations of sandstones in real time. We demonstrate that Berea sandstone, when hydrated, changes dimensions with a relative deformation of the order of 10-4. If the moisture content increases, sandstone samples exhibit an extension and if the moisture content decreases then the samples shrink. We also discover that, immediately after exposure to water, the sandstone temporarily shrinks, just for a few seconds, after which a slow extension begins, and continues until about half of the fluid evaporates. Such shrinkage followed by an extension has been observed also when the sample was exposed to acetone, Mineral Spirits or Vacuum Oil. The results are obtained using a high-resolution nanopositioner technique and, in independent experiments, confirmed using the technique of coda wave interferometry.

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Changes in rock matrix compressibility during deep CO₂ storage

Kim

Makhnenko

2021

Greenhouse Gases

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Geologic carbon storage projects aim to permanently trap large volumes of CO 2 in reservoir rock sealed with low permeability layers. As high-pressure supercritical or liquid CO 2 is injected, hydromechanical and chemical processes caused by the reaction between the rock and acidic mixture of brine and CO 2 are initiated. The compressibility of reservoir rock needs to be properly characterized in order to assess the deformation and stability of the host formations, and there are a number of factors to be considered, including the matrix structure, solid, pores, and fluid. This study triggers from a fundamental question whether CO 2 treatment affects the compressibility of the rock matrix and its dominant composing solid minerals. Three different reservoir representatives are selected: Berea sandstone for silica-rich rock, and Apulian limestone and Indiana limestone for calcite-rich rock. Quartz and calcite are the main composing minerals of the reservoir rock, and their crystals are separately examined. Experimental methods are introduced for high-pressure CO 2 treatment of water-saturated materials, and measurements of the unjacketed and solid compressibilities are conducted. No change in the solid compressibility of the sandstone and quartz after CO 2 treatment is observed, whereas it increases by 18-21% for the limestones and by 15% for calcite. The latter observation is inconsistent with the ultrasonic wave velocities measurements and is believed to be due to the local dissolution of the calcite crystal surface. The results show that only the solid matrix of the limestones becomes more compressible after CO 2 treatment. Consequent microimaging and mercury intrusion porosimetry analyses allowed observations of dissolution and precipitation of calcite, and creation of new connected and non-connected pores. Finally, the changes in limestone solid compressibilities and pore structure could significantly affect the rock properties and behavior during and after CO 2 injection and should be accounted for in the reservoir models.

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Influence of CO2 injection on the poromechanical response of Berea sandstone

Cited by 23 publications

References 67 publications

Evolution of poroviscoelastic properties of silica-rich rock after CO₂ injection

Evolution of poroviscoelastic properties of silica-rich rock after CO₂ injection

Nanometer-Scale Deformations of Berea Sandstone Under Moisture-Content Variations

Changes in rock matrix compressibility during deep CO₂ storage

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Influence of CO2 injection on the poromechanical response of Berea sandstone

Cited by 23 publications

References 67 publications

Evolution of poroviscoelastic properties of silica-rich rock after CO2 injection

Evolution of poroviscoelastic properties of silica-rich rock after CO2 injection

Nanometer-Scale Deformations of Berea Sandstone Under Moisture-Content Variations

Changes in rock matrix compressibility during deep CO2 storage

Contact Info

Product

Resources

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Evolution of poroviscoelastic properties of silica-rich rock after CO₂ injection

Evolution of poroviscoelastic properties of silica-rich rock after CO₂ injection

Changes in rock matrix compressibility during deep CO₂ storage