CO2 Sequestration [Poro-elasticity; Thermo-elasticity]
Whether oil or gas reservoirs have the ability to resist and recover from deformations produced by forces (elasticity), where, there would be a linear relation between the external forces and the corresponding deformations?
Upon CO2 sequestration, whether, the changes in the forces would remain to be sufficiently small, so that the response would remain to be linear (in case of deep saline aquifers)?
OR
Based on the behavior of elastic response along with associated failure stresses, which depends, to a large extent, on CO2 accumulation and spreading, whether, elastic theory will not be able to describe fully, the behavior of porous and permeable aquifer/reservoirs; and in turn, will we always require the concept of poro-elasticity to take into account?
OR
Considering the coefficient of volumetric thermal expansion of CO2, whether thermo-elasticity would require to be considered following CO2 sequestration by taking into account thermal stress and strain?
Suresh Kumar Govindarajan
Professor (HAG) IIT Madras
https://home.iitm.ac.in/gskumar/
https://iitm.irins.org/profile/61643
27-July-2024
Suresh Kumar Govindarajan Yes, thermo-elasticity should be considered following CO2 injection, due to the significant coefficient of volumetric thermal expansion of CO2.
CO2 exhibits a high coefficient of volumetric thermal expansion, meaning its volume changes substantially with temperature fluctuations. When CO2 is injected into a reservoir or soil, it can cause:
1. Thermal expansion: CO2 expands as it warms up, potentially leading to increased pressure and stress on the surrounding material.
2. Thermal contraction: As CO2 cools, it contracts, potentially causing subsidence or settlement.
Thermo-elasticity plays a crucial role in predicting and managing these effects, as it accounts for the coupled thermal and mechanical behavior of the system. Neglecting thermo-elasticity might lead to:
1. Inaccurate predictions of CO2 migration and distribution
2. Underestimation of stress changes and potential for induced seismicity
3. Inadequate design of injection and monitoring systems
To ensure safe and effective CO2 injection, it's essential to consider thermo-elasticity in your analysis, incorporating factors like:
1. CO2 properties (e.g., thermal expansion coefficient, viscosity)
2. Reservoir or soil properties (e.g., thermal conductivity, specific heat capacity)
3. Injection conditions (e.g., temperature, pressure, flow rate)
By accounting for thermo-elasticity, you can better predict and manage the behavior of CO2 in the subsurface, minimizing potential risks and environmental impacts.
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