Response of fractured rock subject to fluid injection part I. Development of a numerical model

Harper, T.R.

doi:10.1016/0040-1951(90)90056-e

Cited by 41 publications

(10 citation statements)

References 21 publications

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“…Numerical simulations performed on fluid injection in a discontinuity system contradict our findings 10 . Further analysis of hydraulic fracture propagation in the presence of discontinuities will give an improved understanding of the principal processes involved.…”

Section: Discussion Of the Experimental Resultscontrasting

confidence: 72%

“…In these simulations, the fluid flows into joints that are oriented in the direction of the preferred fracture plane for low flow rates. At high flow rates, the fluid flows in a radial pattern away from the wellbore 10 . The explanation is that the high flow rate induces a high net pressure and when the net pressure is much higher than the horizontal stress difference, the fluid can flow into fractures with any orientation.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Hydraulic Fracture Propagation in a Multi-Fractured Medium

Beugelsdijk¹,

Pater²,

Sato³

2000

Proceedings of SPE Asia Pacific Conference on Integrated Modelling for Asset Management

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractIn scaled laboratory experiments, we investigated the interaction of a propagating hydraulic fracture with natural discontinuities. We observed the hydraulic fracture geometry as a function of horizontal stress difference, stress regime, flow rate and discontinuity pattern. We observed the smallest amount of interaction for high flowrates. When the horizontal stress difference was increased, the fracture was smoother. However, when we represented the tectonic stress ratio's, with a lower vertical stress compared with the maximum horizontal stress, we observed a higher fracture tortuosity.

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Section: Discussion Of the Experimental Resultscontrasting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Experimental Hydraulic Fracture Propagation in a Multi-Fractured Medium

Beugelsdijk¹,

Pater²,

Sato³

2000

Proceedings of SPE Asia Pacific Conference on Integrated Modelling for Asset Management

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“…The time step required for the stability of the zone of computations is proportional to the mesh size and is estimated as [5] t a = a min(h min /c p ) (14) where c p is the P-wave velocity and h min is the minimum height of the element, a is a user-supplied factor intended to account for the increase of apparent stiffness due to the contact springs attached to the boundary zones. For the calculation of contacts of a rigid block system, the time step is calculated by analogy to a single degree of freedom system as [26] …”

Section: Time Integration For the Ddamentioning

confidence: 99%

Considerations of the discontinuous deformation analysis on wave propagation problems

Zhao

2009

Num Anal Meth Geomechanics

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SUMMARYIn rock engineering, the damage criteria of the rock mass under dynamic loads are generally governed by the threshold values of wave amplitudes, such as the peak particle velocity and the peak particle acceleration. Therefore, the prediction of wave attenuation across fractured rock mass is important on assessing the stability and damage of rock mass under dynamic loads. This paper aims to investigate the applications of the discontinuous deformation analysis (DDA) for modeling wave propagation problems in rock mass. Parametric studies are carried out to obtain an insight into the influencing factors on the accuracy of wave propagations, in terms of the block size, the boundary condition and the incident wave frequency. The reflected and transmitted waves from the interface between two materials are also numerically simulated. To study the tensile failure induced by the reflected wave, the spalling phenomena are modeled under various loading frequencies. The numerical results show that the DDA is capable of modeling the wave propagation in jointed rock mass with a good accuracy.

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“…Pine & Cundall 1985;Last & Harper 1990). For a closely packed system of blocks, there exists a network of domains, each of which is assumed to be filled with fluid under pressure and to communicate with its neighbours through contacts.…”

Section: U D E C Implementationmentioning

confidence: 99%

Effects of stress on the two-dimensional permeability tensor of natural fracture networks

Zhang

Sanderson

1996

Geophysical Journal International

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S U M M A R YThe effects of stress on the 2-D permeability tensor of natural fracture networks were studied using a numerical method (Universal Distinct Element Code). On the basis of three natural fracture networks sampled around Dounreay, Scotland, numerical modelling was carried out t o examine the fluid flow in relation to the variations in burial depth, differential stress and loading direction. It was demonstrated that the permeability of all the networks decreased with depth due to the closure of aperture.The permeability approached the minimum value a t some depth below which little further variation occurred. Also, differential stress had a significant effect on both the magnitude and direction of permeability. The permeability generally decreased with increasing major horizontal stress for a fixed minor horizontal stress, but the various networks considered showed different behaviours. A factor, termed the average deviation angle of maximum permeability (A,), was defined to describe quantitatively the deviation degree of the direction of the major permeability component from the applied major stress direction. For networks whose behaviour is controlled by set(s) of systematic fractures, A, is significantly greater than zero, whereas those comprised of non-systematic fractures have A, close to zero. In general, fractured rock masses, especially those with one o r more sets of systematic fractures, cannot be treated as equivalent porous media. Specification of the geometry of the network is a necessary, but not sufficient, condition for models of fluid flow. Knowledge of the in situ stress, and the deformation it induces, is necessary to predict the behaviour of the rock mass.

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Response of fractured rock subject to fluid injection part I. Development of a numerical model

Cited by 41 publications

References 21 publications

Experimental Hydraulic Fracture Propagation in a Multi-Fractured Medium

Experimental Hydraulic Fracture Propagation in a Multi-Fractured Medium

Considerations of the discontinuous deformation analysis on wave propagation problems

Effects of stress on the two-dimensional permeability tensor of natural fracture networks

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