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

Published on Sep 1, 2020
· DOI :10.1051/E3SCONF/202020508007
Kiseok Kim3
Estimated H-index: 3
(UIUC: University of Illinois at Urbana–Champaign),
Roman Y. Makhnenko12
Estimated H-index: 12
(UIUC: University of Illinois at Urbana–Champaign)
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.
#1Ali Tarokh (UIUC: University of Illinois at Urbana–Champaign)H-Index: 8
#2Roman Y. Makhnenko (UIUC: University of Illinois at Urbana–Champaign)H-Index: 12
Last. Dustin E. Sweet (TTU: Texas Tech University)H-Index: 11
view all 7 authors...
Abstract Subsurface reservoirs are targeted formations for geologic carbon dioxide (CO2) storage. Even if proper management of injection pressures minimizes the risks of induced seismicity, high pressure CO2 can interact with brine-saturated host rock and cause microstructural changes that lead to alterations in poromechanical properties of the rock. The effect is well pronounced in carbonate-rich rock, but observations on silica-rich reservoirs are ambiguous. In this study, we report a broad ra...
4 CitationsSource
#1Ali Tarokh (UIUC: University of Illinois at Urbana–Champaign)H-Index: 8
#2Roman Y. Makhnenko (UIUC: University of Illinois at Urbana–Champaign)H-Index: 12
9 CitationsSource
#1Zhuofan Shi (SC: University of Southern California)H-Index: 6
#2Lin Sun (SC: University of Southern California)H-Index: 1
Last. Kristian Jessen (SC: University of Southern California)H-Index: 21
view all 9 authors...
Abstract When sandstone rocks are exposed to CO2-saturated brine, their transport and mechanical properties can change due to brine/CO2-induced chemical reactions. The present study investigates the change in the flow-through characteristics, porosity, and the mechanical behavior of Mt. Simon Sandstone samples caused by exposure to brine/CO2. The cores, extracted from a depth interval of 2110.4–2111.4 m (6924–6927 ft) in the Mt. Simon formation, were first characterized for their mechanical and ...
14 CitationsSource
#1Kiseok Kim (UIUC: University of Illinois at Urbana–Champaign)H-Index: 3
#2Víctor Vilarrasa (UPC: Polytechnic University of Catalonia)H-Index: 23
Last. Roman Y. MakhnenkoH-Index: 12
view all 3 authors...
Geologic carbon storage is considered as a requisite to effectively mitigate climate change, so large amounts of carbon dioxide (CO2) are expected to be injected in sedimentary saline formations. CO2 injection leads to the creation of acidic solution when it dissolves into the resident brine, which can react with reservoir rock, especially carbonates. We numerically investigated the behavior of reservoir-caprock system where CO2 injection-induced changes in the hydraulic and geomechanical proper...
16 CitationsSource
#1Roman Y. Makhnenko (UIUC: University of Illinois at Urbana–Champaign)H-Index: 12
#2Yury Podladchikov (UNIL: University of Lausanne)H-Index: 12
18 CitationsSource
#1Samuel Omlin (UNIL: University of Lausanne)H-Index: 2
#2Benjamin Malvoisin (UNIL: University of Lausanne)H-Index: 12
Last. Yury Podladchikov (UNIL: University of Lausanne)H-Index: 12
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In the lower crust, viscous compaction is known to produce solitary porosity and fluid pressure waves. Metamorphic (de)volatilization reactions can also induce porosity changes in response to the propagating fluid pressure anomalies. Here we present results from high-resolution simulations using Graphic Processing Unit parallel processing with a model that includes both viscous (de)compaction and reaction-induced porosity changes. Reactive porosity waves propagate in a manner similar to viscous ...
24 CitationsSource
#1Roman Y. Makhnenko (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 12
#2Víctor Vilarrasa (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 23
Last. Lyesse Laloui (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 52
view all 4 authors...
Caprock formations are intended to prevent upwards carbon dioxide (CO2) migration to the surface during CO2 geological storage. Caprock interaction with CO2, as well as its potential consequences, requires to be predicted, and thus, need to be studied experimentally. Laboratory investigations of caprock behavior are complex due to its low permeability, and the scarcity of experimental studies involving high-pressure CO2 injection into caprock representatives puts this difficulty into manifest. I...
19 CitationsSource
#1Roman Y. Makhnenko (UMN: University of Minnesota)H-Index: 12
#2Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
In situ rock is often saturated with fluid, the presence of which affects both elastic parameters and inelastic deformation processes. Techniques were developed for testing fluid-saturated porous rock under the limiting conditions of drained (long-term), undrained (short-term) and unjacketed (solid matrix) response in hydrostatic, axisymmetric and plane-strain compression. Drained and undrained poroelastic parameters, including bulk modulus, Biot and Skempton coefficients, of Berea sandstone wer...
42 CitationsSource
#1Jeremy RohmerH-Index: 19
#2Anne Pluymakers (University of Oslo)H-Index: 9
Last. François Renard (University of Oslo)H-Index: 56
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Abstract Due to the corrosive nature of dissolved CO2, the potential short or long term alteration of rock properties, represents a major issue in several sites where natural CO2 circulation is observed, as well as in reservoirs targeted for storage of anthropogenic CO2. To date, this has been primarily studied from a transport-chemical perspective, with laboratory evidence of microstructural modifications together with the consequences for flow properties. Compared to the transport-chemical asp...
68 CitationsSource
#2Yuri Podladchikov (UNIL: University of Lausanne)H-Index: 49
A nonlinear viscoelastoplastic theory is developed for porous rate-dependent materials filled with a fluid in the presence of gravity. The theory is based on a rigorous thermodynamic formalism suitable for path-dependent and irreversible processes. Incremental evolution equations for porosity, Darcy's flux, and volumetric deformation of the matrix represent the simplest generalization of Biot's equations. Expressions for pore compressibility and effective bulk viscosity are given for idealized c...
53 CitationsSource
Cited By1
#1Kiseok Kim (UIUC: University of Illinois at Urbana–Champaign)H-Index: 3
#2Roman Y. Makhnenko (UIUC: University of Illinois at Urbana–Champaign)H-Index: 12