Interpretation by numerical modelling of changes of fracture system hydraulic conductivity induced by fluid injection

Harper, T.R.; Last, N. C.

doi:10.1680/geot.1989.39.1.1

Cited by 19 publications

(5 citation statements)

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“…We follow a conceptual mechanism proposed in Harper & Last (1989) and Baria et al (1984f) mechanism also implies that any hydraulic tensile fractures along set 2 joints, while likely to be dynamically induced near the injection point, remain below the threshold of detection by the seismic network.…”

Section: Non-fickian Diffusion and Anisotropic Permeabilitymentioning

confidence: 75%

Induced seismicity at the UK ‘hot dry rock’ test site for geothermal energy production

Main

Jupe

2018

Geophysical Journal International

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In enhanced geothermal systems (EGS), fluid is injected at high pressure in order to stimulate fracturing and/or fluid flow through otherwise relatively impermeable underlying hot rocks to generate power and/or heat. The stimulation induces micro-earthquakes whose precise triggering mechanism and relationship to new and pre-existing fracture networks are still the subject of some debate. Here we analyse the dataset for induced micro-earthquakes at the UK "hot dry rock" experimental geothermal site (Rosemanowes, Cornwall). We quantify the evolution of several metrics used to characterise induced seismicity, including the seismic strain partition factor and the "seismogenic index". The results show a low strain partition factor of 0.01% and a low seismogenenic index indicating that aseismic processes dominate. We also analyse the spatio-temporal distribution of hypocentres, using simple models for the evolution of hydraulic diffusivity by (a) isotropic and (b) anisotropic

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Section: Non-fickian Diffusion and Anisotropic Permeabilitymentioning

confidence: 75%

Induced seismicity at the UK ‘hot dry rock’ test site for geothermal energy production

Main

Jupe

2018

Geophysical Journal International

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“…As one of the earliest works in this area, Harper and Last [138] investigated the aperture change of two mutually orthogonal sets of parallel fractures during hydraulic fracturing using UDEC, and studied the effects of in-situ stress and pore pressure. Under different block patterns and insitu stress regimes, Zhang et al [374] investigated hydraulic fracture propagation near wellbore.…”

Section: Discontinuum-based Methodsmentioning

confidence: 99%

A Review of Hydraulic Fracturing Simulation

Chen

Dias

Sun

et al. 2021

Arch Computat Methods Eng

122

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Along with horizontal drilling techniques, multi-stage hydraulic fracturing has improved shale gas production significantly in past decades. In order to understand the mechanism of hydraulic fracturing and improve treatment designs, it is critical to conduct modelling to predict stimulated fractures. In this paper, related physical processes in hydraulic fracturing are firstly discussed and their effects on hydraulic fracturing processes are analysed. Then historical and state of the art numerical models for hydraulic fracturing are reviewed, to highlight the pros and cons of different numerical methods. Next, commercially available software for hydraulic fracturing design are discussed and key features are summarised. Finally, we draw conclusions from the previous discussions in relation to physics, method and applications and provide recommendations for further research.

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“…where a int and a res are the initial and residual apertures respectively 10,11,12 . where a int and a res are the initial and residual apertures respectively 10,11,12 .…”

Section: Methodsmentioning

confidence: 99%

Stress-Sensitive Fracture-Flow Modelling in Fractured Reservoirs

Jolly¹,

Wei²,

Pine³

2000

Proceedings of SPE International Petroleum Conference and Exhibition in Mexico

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe flow characteristics of fractures are significantly affected by the stresses acting upon them. Reservoirs where the majority of the fluid flow is through fractures are very sensitive to the stress regime and its perturbations. Activities, such as production from a reservoir or injection into a reservoir, cause changes in the fluid pressure. This will alter the effective stress, which in turn will affect the flow of hydrocarbons through the fracture network. In order to understand how hydrocarbons flow within a fractured reservoir it is necessary to determine the influence of both stress and fluid pressure in a fracture network.There have been many experimental studies showing the influence of stress on the flow of fluid through single fractures from which a relationship between fracture permeability and effective stress can be developed. Effective stress acting on a fracture can be established by considering the orientation of the fracture relative to the in-situ stress regime and the fluid pressure within the fracture. Once the effective stress acting on a fracture has been found the corresponding permeability can be assigned within a discrete fracture network (DFN) model. This approach then allows examination of stress-sensitive flow within fractured reservoirs. This paper presents a methodology for incorporating insitu stresses and stress changes due to production and injection in DFN modelling. The approach is significantly different from published methodologies on this subject, which are based on continuum porous medium modelling. By simulating and interpreting well tests in the fracture network during reservoir appraisal and after significant production, the presented approach would help in determining the influence of stress on hydrocarbon flow within a fracture network and to optimise future well locations and orientations.

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Interpretation by numerical modelling of changes of fracture system hydraulic conductivity induced by fluid injection

Cited by 19 publications

References 0 publications

Induced seismicity at the UK ‘hot dry rock’ test site for geothermal energy production

Induced seismicity at the UK ‘hot dry rock’ test site for geothermal energy production

A Review of Hydraulic Fracturing Simulation

Stress-Sensitive Fracture-Flow Modelling in Fractured Reservoirs

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