Full field investigation of salt deformation at room temperature: Cooperation of crystal plasticity and grain sliding

Bourcier, Mathieu; Dimanov, Alexandre; Héripré, Eva; Raphanel, Jean; Desbois, M. Bornert G.

doi:10.1201/b12041-9

Cited by 2 publications

(2 citation statements)

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“…These differences lead to a different dependence on stress and temperature meaning that the rate‐controlling microscale process can change if stress or temperature changes [ Urai et al , ]. Failure to recognize this can lead to an empirical fit to flow data that works well at the conditions of the corresponding laboratory tests but which fails when extrapolating to different stresses or temperatures [see Carter et al , ; Muhammad et al , ; Günther et al , ]. For salt, the typically observed values of Q and n for pressure solution and dislocation creep in equation imply that pressure solution should dominate at low stresses and temperatures versus dislocation creep at higher stresses and temperatures [ Urai et al , ].…”

Section: The Creep Behavior Of Rock Saltmentioning

confidence: 99%

Impact of rock salt creep law choice on subsidence calculations for hydrocarbon reservoirs overlain by evaporite caprocks

2016

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Accurate forward modeling of surface subsidence above producing hydrocarbons reservoirs requires an understanding of the mechanisms determining how ground deformation and subsidence evolve. Here we focus entirely on rock salt, which overlies a large number of reservoirs worldwide, and specifically on the role of creep of rock salt caprocks in response to production‐induced differential stresses. We start by discussing available rock salt creep flow laws. We then present the subsidence evolution above an axisymmetric finite element representation of a generic reservoir that extends over a few kilometers and explore the effects of rock salt flow law choice on the subsidence response. We find that if rock salt creep is linear, as appropriate for steady state flow by pressure solution, the subsidence response to any pressure reduction history contains two distinct components, one that leads to the subsidence bowl becoming narrower and deeper and one that leads to subsidence rebound and becomes dominant at later stages. This subsidence rebound becomes inhibited if rock salt deforms purely through steady state power law creep at low stresses. We also show that an approximate representation of transient creep leads to relatively small differences in subsidence predictions. Most importantly, the results confirm that rock salt flow must be modeled accurately if good subsidence predictions are required. However, in practice, large uncertainties exist in the creep behavior of rock salt, especially at low stresses. These are a consequence of the spatial variability of rock salt physical properties, which is practically impossible to constrain. A conclusion therefore is that modelers can only resort to calculating bounds for the subsidence evolution above producing rock salt‐capped reservoirs.

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Section: The Creep Behavior Of Rock Saltmentioning

confidence: 99%

Impact of rock salt creep law choice on subsidence calculations for hydrocarbon reservoirs overlain by evaporite caprocks

2016

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“…At this time, the self-healing effect of salt rock occupies the dominant role during the creep process. Muhammad et al [87] found that when temperature T �125°C, the dislocation climb creep mechanism of salt rock is closely related to the confining pressure, while the variation of confining pressure has little effect on the dislocation slip creep mechanism. Based on the creep experimental results of salt rock, Carter and Hansen [88] studied the relationship between the subgrain size and stress and pointed out that for salt rock with bigger grain size, the plastic flow of salt rock exhibits the slip between grain boundaries.…”

Section: Microscopic Creep Deformation Mechanism Of Salt Rockmentioning

confidence: 99%

Creep Properties and Constitutive Model of Salt Rock

Zhang

Song

Wang

et al. 2021

Advances in Civil Engineering

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Due to the advantages of low porosity, low permeability, high ductility, and excellent capacities for creep and damage self-healing, salt rock is internationally considered as the ideal medium for underground storage of energy and disposal of radioactive waste. As one of the most important mechanical properties of salt rock, creep properties are closely related to the long-term operation stability and safety of salt rock underground storage cavern. A comprehensive review on the creep properties and constitutive model of salt rock is put forward in this paper. The opinions and suggestions on the research priority and direction of salt rock's mechanical properties in the future are put forward: (1) permeability variation of salt rock under the coupling effect of temperature and stress; (2) damage mechanism and evolution process under the effect of creep-fatigue interaction and low frequency cyclic loading; (3) microdeformation mechanisms of salt rock and the relationship between microstructure variations and macrocreep behavior during creep process; (4) the establishment of the creep damage constitutive model with simple form, less parameters, easy application, and considering the damage self-healing ability of salt rock simultaneously.

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Full field investigation of salt deformation at room temperature: Cooperation of crystal plasticity and grain sliding

Cited by 2 publications

References 1 publication

Impact of rock salt creep law choice on subsidence calculations for hydrocarbon reservoirs overlain by evaporite caprocks

Impact of rock salt creep law choice on subsidence calculations for hydrocarbon reservoirs overlain by evaporite caprocks

Creep Properties and Constitutive Model of Salt Rock

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