A shear‐dilation‐based model for evaluation of hydraulically stimulated naturally fractured reservoirs

Rahman, Motiur; Hossain, Mofazzal; Rahman, Sheik S.

doi:10.1002/nag.208

Cited by 96 publications

(66 citation statements)

References 33 publications

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“…[47][48][49][50] In order to examine the size effect on the anisotropy of permeability, the variations of L for other three fractures with larger JRC become to be less dramatic. This is most likely because of the influences of fracture roughness on the aperture fields that in turn depend on the magnitude of fracture size.…”

Section: Size Effect On the Anisotropy Of Permeabilitymentioning

confidence: 99%

“…[19][20][21] The rock fractures in the deep underground are generally subjected in situ stresses containing normal and shear stresses. [22][23][24][25] The aperture fields and the flow paths in fractures are changed by both normal stress and shear displacement. The normal stress tends to close the fracture with more contact areas that hinder the flow through the fracture, while the shear displacement tends to open the fracture due to shear dilation and thus increases the permeability of the fracture.…”

Section: Introductionmentioning

confidence: 99%

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Size Effect on the Permeability and Shear Induced Flow Anisotropy of Fractal Rock Fractures

et al. 2018

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The effect of model size on fluid flow through fractal rough fractures under shearing is investigated using a numerical simulation method. The shear behavior of rough fractures with selfaffine properties was described using the analytical model, and the aperture fields with sizes ¶ Corresponding author. This is an Open Access article published by World Scientific Publishing Company. It is distributed under the terms of the Creative Commons Attribution 4.0 (CC-BY) License. Further distribution of this work is permitted, provided the original work is properly cited. varying from 25 to 200 mm were extracted under shear displacements up to 20 mm. Fluid flow through fractures in the directions both parallel and perpendicular to the shear directions was simulated by solving the Reynolds equation using a finite element code. The results show that fluid flow tends to converge into a few main flow channels as shear displacement increases, while the shapes of flow channels change significantly as the fracture size increases. As the model size increases, the permeability in the directions both parallel and perpendicular to the shear direction changes significantly first and then tends to move to a stable state. The size effects on the permeability in the direction parallel to the shear direction are more obvious than that in the direction perpendicular to the shear direction, due to the formation of contact ridges and connected channels perpendicular to the shear direction. The variances of the ratio between permeability in both directions become smaller as the model size increases and then this ratio tends to maintain constant after a certain size, with the value mainly ranging from 1.0 to 3.0. 1840001-1

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Section: Size Effect On the Anisotropy Of Permeabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Size Effect on the Permeability and Shear Induced Flow Anisotropy of Fractal Rock Fractures

et al. 2018

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“…Pressurized fractures may open due to a reversible, compliant response to pressure (Rutqvist, 1995;Rutqvist and Stephansson, 2003;Evans and Meier, 1995) or due to largely irreversible shear dilation (Lee and Cho, 2002;Rahman et al, 2002). As a consequence of the coupling between pressure, fracture compliance and permanent fracture aperture changes, the pressure field does not propagate through the reservoir as a linear diffusive field, but rather as a pressure front (Murphy et al, 2004).…”

Section: Stimulation By Hydraulic Shearingmentioning

confidence: 99%

The seismo-hydromechanical behavior during deep geothermal reservoir stimulations: open questions tackled in a decameter-scale in situ stimulation experiment

et al. 2018

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Abstract. In this contribution, we present a review of scientific research results that address seismo-hydromechanically coupled processes relevant for the development of a sustainable heat exchanger in low-permeability crystalline rock and introduce the design of the In situ Stimulation and Circulation (ISC) experiment at the Grimsel Test Site dedicated to studying such processes under controlled conditions. The review shows that research on reservoir stimulation for deep geothermal energy exploitation has been largely based on laboratory observations, large-scale projects and numerical models. Observations of full-scale reservoir stimulations have yielded important results. However, the limited access to the reservoir and limitations in the control on the experimental conditions during deep reservoir stimulations is insufficient to resolve the details of the hydromechanical processes that would enhance process understanding in a way that aids future stimulation design. Small-scale laboratory experiments provide fundamental insights into various processes relevant for enhanced geothermal energy, but suffer from (1) difficulties and uncertainties in upscaling the results to the field scale and (2) relatively homogeneous material and stress conditions that lead to an oversimplistic fracture flow and/or hydraulic fracture propagation behavior that is not representative of a heterogeneous reservoir. Thus, there is a need for intermediate-scale hydraulic stimulation experiments with high experimental control that bridge the various scales and for which access to the target rock mass with a comprehensive monitoring system is possible. The ISC experiment is designed to address open research questions in a naturally fractured and faulted crystalline rock mass at the Grimsel Test Site (Switzerland). Two hydraulic injection phases were executed to enhance the permeability of the rock mass. During the injection phases the rock mass deformation across fractures and within intact rock, the pore pressure distribution and propagation, and the microseismic response were monitored at a high spatial and temporal resolution.

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“…Rahman et al [4] proposed a shear dilation stimulation technique in which permeability of natural fracture systems increases during fluid injection below fracturing pressure to improve permeability of natural fracture systems. However, after injected fluid is produced, the open fractures tend to close back.…”

Section: Introductionmentioning

confidence: 99%

Stimulation of coal seam permeability by micro-sized graded proppant placement using selective fluid properties

Keshavarz

Badalyan

Carageorgos

et al. 2015

Fuel

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A shear‐dilation‐based model for evaluation of hydraulically stimulated naturally fractured reservoirs

Cited by 96 publications

References 33 publications

Size Effect on the Permeability and Shear Induced Flow Anisotropy of Fractal Rock Fractures

Size Effect on the Permeability and Shear Induced Flow Anisotropy of Fractal Rock Fractures

The seismo-hydromechanical behavior during deep geothermal reservoir stimulations: open questions tackled in a decameter-scale in situ stimulation experiment

Stimulation of coal seam permeability by micro-sized graded proppant placement using selective fluid properties

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