Nano- to Microscale Pore Characterization of the Utica Shale

Swift, A.; Sheets, J.; Cole, David R.; Anovitz, Lawrence M.; Welch, Susan A.; Gu, Xiaoxiong; Mildner, D. F. R.

doi:10.15530/urtec-2014-1923522

Cited by 2 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The elastic strains are always related to the effective stresses via the elasticity law. As such, Equations (9a) and (29) allow us to rewrite the right-hand side of Equation (32) as…”

Section: Plastic Regionmentioning

confidence: 99%

“…where σ r (s + ), σ θ (s + ), and σ r (b) can be expressed in terms of u s via Equations ( 9), and σ r (s − ) is given in Equation (29).…”

Section: Model Summarymentioning

confidence: 99%

“…These fractures provide hydraulic access deeper into the reservoir and allow gas to be collected from a larger region of the rock [15,17,26]. Fracking relies on the brittle failure of shale, but the mechanical properties of shale depend strongly on the composition [8,15,27]; many hydrocarbon-bearing shales have high clay content and may therefore have non-negligible ductility [10,[29][30][31]. Both laboratory and field data suggest that the ductility of shales can have an important impact on the success of fracking [8,17], but the ductility of shales is almost always neglected.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Large poroelasto-plastic deformations due to radially outward fluid injection

Auton

MacMinn

2019

Journal of the Mechanics and Physics of Solids

View full text Add to dashboard Cite

Flow-induced failure of granular materials is relevant to a broad range of geomechanical applications.Plasticity, which is the inherent failure mechanism of most granular materials, enables large deformations that can invalidate linearised models. Motivated by fluid injection into a borehole, we develop a steady-state model for the large deformation of a thick-walled, partially-permeable, elastic-perfectly-plastic annulus with a pressurised inner cavity. We account for pre-existing compressive stresses, as would be present in the subsurface, by subtracting a compressed initial state from our solutions to provide the additional disturbance due to fluid injection. We also introduce a simple parameter that allows for a smooth transition from an impermeable material (i.e., subject to mechanical loading at the inner wall) to a fully permeable material (i.e., subject to an internal pore-pressure gradient), which would be relevant to coated boreholes and very-low-permeability materials. We focus on the difference between poroelastic and poroelasto-plastic deformations, the role of kinematic and constitutive nonlinearity, and the transition from impermeable to fully permeable. We find that plasticity can enable much larger deformations while predicting much smaller stresses. The former makes model choice increasingly important in the plastic region, while the elastic region remains insensitive to these changes. We also find that, for a fixed total stress at the inner wall, materials experience larger deformations and generally larger stresses as they transition from impermeable to fully permeable.

show abstract

“…The elastic strains are always related to the effective stresses via the elasticity law. As such, Equations (9a) and (29) allow us to rewrite the right-hand side of Equation (32) as…”

Section: Plastic Regionmentioning

confidence: 99%

“…where σ r (s + ), σ θ (s + ), and σ r (b) can be expressed in terms of u s via Equations ( 9), and σ r (s − ) is given in Equation (29).…”

Section: Model Summarymentioning

confidence: 99%