Thermo-Poroelastic Analysis in Wellbore Stability
Summary
Thermo-poroelastic analysis examines the coupled interactions among temperature changes, fluid pressure, and elastic deformation in porous rock surrounding a drilled wellbore. When drilling fluids differ markedly in temperature from the formation, thermal gradients induce expansion or contraction of the rock matrix, which in turn alters pore pressures and stress distributions. These coupled effects can promote tensile or shear failure around the borehole, compromising structural integrity and operational safety. The analysis integrates heat transfer models, poroelastic constitutive relations and failure criteria to predict zones of instability, inform the choice of drilling fluid properties and mud weight, and optimise drilling trajectories. Global interest has surged owing to deep, high-temperature hydrocarbon and geothermal wells, where accurate prediction of borehole stresses under non-isothermal and pressure-transient conditions is critical for risk reduction and cost efficiency. Advances in analytical solutions, numerical finite-element schemes and laboratory measurements of dynamic poroelastic parameters have enriched our mechanistic understanding, enabling more reliable design of drilling programmes in diverse lithologies from granitic hot-dry rocks to elastic anisotropic shales.
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Thermo-Poroelastic Analysis in Wellbore Stability publication trend
The graph below shows the total number of articles in thermo-poroelastic analysis in wellbore stability across all publications each year (not limited to Nature Index journals).
Technical terms
Thermo-poroelasticity: Coupling between temperature variations, pore fluid pressure and elastic deformation in a porous medium.
Biot’s coefficient: A dimensionless parameter quantifying the influence of pore pressure on bulk volumetric strain.
Effective stress: The stress carried by the solid matrix, defined as total stress minus pore fluid pressure.
Elastic anisotropy: Variation of elastic response with direction in a heterogeneous rock formation.
Thermal stress: Stress induced in a material due to constrained thermal expansion or contraction.
References
- Modeling wellbore instability in hot dry rock under various temperature conditions. Unconventional Resources (2023).
- Effect of Temperature on Stiffness of Sandstones from the Deep North Sea Basin. Rock Mechanics and Rock Engineering (2020).
- A Transient Analytical Model for Predicting Wellbore/Reservoir Temperature and Stresses during Drilling with Fluid Circulation. Energies (2017).
- Porothermoelastic response of an oil sand formation subjected to injection and micro-fracturing in horizontal wells. Petroleum Science (2020).
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