A new geomechanical modeling workflow for CCUS near-well integrity assessment in layered poroelastic medium
conference paper
The practice of cold CO2 injection into depleted oil/gas reservoirs addressing the increasing global emissions requires efficient and robust geomechanical assessment of near-well (caprock) damage risks. The geomechanical responses involve driving forces of small-footprint cooling zones from thermal effects, large-footprint pressure plumes from fluid diffusion, and possible continuing reservoir inelastic compaction. The workflow of coupling these processes to rock mechanics for geomechanical assessment is based on numerical or (semi-)analytical solutions. Among the latter, the recent development of MACRIS at TNO considers the fundamental point-source solution in homogeneous half-space which has been validated with FEM methods and is computationally efficient. Here, we extend the MACRIS framework and use the point-source solution in a layered, poroelastic half space. Such improvement can provide several advantages of considering vertical heterogeneity of earth medium, solid-fluid coupling outside the reservoir, and undrained conditions in caprock. By incorporating the layered poroelastic point-source solution, we develop a workflow consisting of reservoir hydro-thermal simulation for temperature and fluid pressure distributions, calculating point-source mechanical influence functions in layered poroelastic medium, and integration for geomechanical assessment at targets. Finally, we demonstrate the workflow and show results from a case study using realistic model parameters provided by operators.
Topics
TNO Identifier
996899
Publisher
American Rock Mechanics Association ARMA
Source title
Presented at the 58th US Rock Mechanics/Geomechanics Symposium, Golden, CO, USA, 23-26 June 2024
Collation
8 p.
Files
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