Chemoporoelastic Parameter Identification of a Reactive Shale

Detournay, Emmanuel; Sarout, Joël; Tan, C.P.; Caurel, Jean

doi:10.1007/1-4020-3865-8_13

Cited by 10 publications

(7 citation statements)

References 6 publications

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“…Because of the mathematical complexities, most of the existing poro-chemo-electro-elastic analytical solutions are one-dimensional. 28,29 Various analytical solutions [30][31][32][33] have been derived to simulate pore pressure transmission tests on chemically active shale. Such analytical solutions were also used to match experimental data to estimate shale poroelastic and chemical parameters, such as permeability, ion diffusivity, and membrane efficiency coefficient.…”

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Responses of chemically active and naturally fractured shale under time‐dependent mechanical loading and ionic solution exposure

Liu

Hoang

Abousleiman

2017

Num Anal Meth Geomechanics

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SummaryIn this paper, the analytical dual-porosity dual-permeability poromechanics solution for saturated cylinders is extended to account for electrokinetic effects and material transverse isotropy, which simulate the responses of chemically active naturally fractured shale under time-dependent mechanical loading and ionic solution exposure.The solution addresses the stresses, fracture pore pressure, matrix pore pressure, fluid fluxes, ion concentration evolution, and displacements due to the applied stress, pore pressure, and solute concentration difference between the sample and the circulation fluid. The presented solution will not only help validate numerical simulations but also assist in calibrating and interpreting laboratory results on dual-porosity dual-permeability shale. It is recommended that the analytical solutions of radial and axial displacements be used to match the corresponding laboratory-recorded data to determine shale dual permeability and chemo-electrical parameters including membrane coefficient, ions diffusion coefficients, and electro-osmotic permeability.KEYWORDS chemically active, dual-poro-chemo-electro-elasticity, electro-osmotic permeability, natural fractures, shale | INTRODUCTIONThe recent boom in oil and gas production from shale reservoirs around the world has produced a tectonic shift in the global energy landscape. However, despite the promising potentials, there are still many challenges in understanding, analyzing, and predicting the behaviors of these unconventional reservoirs during drilling, stimulation, and production. Some of these challenges come from the complex geomechanics properties of shale. Most shales have higher degree of mechanical anisotropy than conventional reservoir rocks. In addition, shale displays swelling and shrinking behaviors when exposed to aqueous drilling and stimulation fluids because of the electrochemical interaction between its clay content and the solutions. Furthermore, many shales are naturally fractured, as illustrated in Figure 1, resulting in complex pore pressure distribution and evolution in the dual-porosity dual-permeability system. It is noted that shales with dual-porosity system that might result from different scales of pore structures 1 can be also modeled using the current approach.This study aims to investigate the behavior of dual-porosity dual-permeability shale rocks under laboratory conditions. The original dual-porosity dual-permeability concept for fractured/fissured rocks was proposed by Barenblatt et al. 2 The 2 overlapping continua, primary porosity and secondary porosity, possess their own fluid pressure fields. Warren and Root 3 proposed an idealized dual-porosity model, assuming that the secondary porosity consists of an orthogonal system of uniform fractures and that fluid can communicate between primary and secondary porosities, but not among the primary porosity elements. Later on,

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confidence: 99%

Responses of chemically active and naturally fractured shale under time‐dependent mechanical loading and ionic solution exposure

Liu

Hoang

Abousleiman

2017

Num Anal Meth Geomechanics

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“…(41). A consequence of this initial condition is that the downstream reservoir concentration is the same as the initial upstream concentration, before the upstream concentration jump.The discontinuous jumps of the concentrations across the interfaces between the sample and the reservoir are at odds with earlier models of pressure transmission(Sherwood (1993),Detournay et al (2005)), but in agreement with elementary electrochemistry. The sharp reduction of the shale pore pressure, following a contact with an environment of low chemical potential, has been observed repeatedly in the field(Neuzil (2000)).…”

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confidence: 38%

Analytical Solution of a Pressure Transmission Experiment on Shale Using Electrochemomechanical Theory

Huyghe

2007

J. Eng. Mech.

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“…The literature clearly relates osmotic pressures in shales with ionisation of the clay platelets. Unlike previous models of pressure transmission , which associate the osmosis of the shale with a chemical phenomenon (Sherwood 1993;Detournay et al 2005), this model introduces the ionisation as the source of the osmotic forces observed. Hence, the experimental parameters needed are closer to the physics of the system.…”

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confidence: 99%

Analytical solution of a pressure transmission experiment

Huyghe¹

2005

Poromechanics III - Biot Centennial (1905-2005)

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Analytical solutions are derived for a pressure transmission experiment of a saturated charged compressible porous medium. The governing equations describe infinitesimal deformations of charged porous media saturated with a mono-valent ionic solution. From the governing equations a coupled diffusion equation in state space notation is derived for the electro-chemical potentials, which is decoupled introducing a set of normal parameters, being a linear combination of the eigenvectors of the diffusivity matrix. The magnitude of the eigenvalues of the diffusivity matrix correspond to the time scales for Darcy flow, diffusion of ionic constituents and diffusion of electrical potential.1 Introduction Shales exhibit swelling and shrinkage behavior induced by changes in external salt concentration. Swelling and shrinkage results from the interaction between the fixed charges on the solid and ions present in the fluid. Donnan-osmosis, electroosmosis, streaming potentials and streaming currents, (Mitchell 1993) are observed phenomena. Swelling of shales is of major concern for petroleum engineering during active drilling, (Heidug and Wong 1996) (Frijns et al. 1997). The solution procedure has been verified using an analytical solution of confined swelling and compression by (van Meerveld et al. 2003). While these biomechanical models in-

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Chemoporoelastic Parameter Identification of a Reactive Shale

Cited by 10 publications

References 6 publications

Responses of chemically active and naturally fractured shale under time‐dependent mechanical loading and ionic solution exposure

Responses of chemically active and naturally fractured shale under time‐dependent mechanical loading and ionic solution exposure

Analytical Solution of a Pressure Transmission Experiment on Shale Using Electrochemomechanical Theory

Analytical solution of a pressure transmission experiment

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