A global review of deep geothermal energy exploration: from a view of rock mechanics and engineering

Zhang, Yuliang; Zhao, Gao‐Feng

doi:10.1007/s40948-019-00126-z

Cited by 61 publications

(24 citation statements)

References 107 publications

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“…By substituting formula (4) into formula (3), the impact load that the circular granite specimen could bear in the process of impact loading can be obtained by formula (5).…”

Section: Plos Onementioning

confidence: 99%

“…Under the impact load, the rock specimen is deformed in an elliptical trend, and the deformation and strain in the inner ellipse of the circular specimens are even. (5). When the radical impact load that the circular granite can bear increases to the peak value, it is considered that the circular specimen has been broken at that moment.…”

Section: Plos Onementioning

confidence: 99%

“…Based on assumptions (1)- (5), elasticity theory is used to deduce the dynamic strain at any point of the circular granite. By comparing the strain with the maximum dynamic tensile strain that the circular granite can bear, the failure criterion of the circular granite under the radical impact load can be established.…”

Section: Deduction Of Failure Criterionmentioning

confidence: 99%

“…Deep geothermal energy is considered a new energy source that is a clean, renewable and potential resourcefor solving the energy crisis. However, the critical problem is how to extract deep geothermal energy safely, efficiently and sustainably [ 5 , 6 ]. Currently, the methods to explore geothermal energy include single wellbore heat transforming, CO 2 geological storage, double-well circulation exploration and so on [ 7 – 9 ], and they all require drilling deep wells.…”

Section: Introductionmentioning

confidence: 99%

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Study on the dynamic characteristics of rock surrounding a wellbore in energy storage areas during deep geothermal energy mining

et al. 2020

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Based on the engineering background in which the rock surrounding a wellbore is affected by a thermal shock, impact disturbances from drilling vibration, cyclic heat extraction and high temperature during hydrothermal geothermal energy mining, the environmental conditions in the shaft wall rock are simulated by means of high temperature, cooling, immersing granite in water with different curing temperatures and applying impact loads. Additionally, an experimental study on the mechanical characteristics of circular granite specimens under radial impact loads and in the heat treatment and water curing conditions is carried out. The results show that the inner diameters of the rings, heating temperatures, curing water temperatures and cycle heating times are less affected than other parameters by the impact load-strain curves of circular granite, which can generally be divided into three sections, i.e., the initial straight stage, nonlinear ascent yield stage and post-peak nonlinear decline stage. The factors in the test weaken the capacity of the circular granite to resist the impact, but the sizes of the inner diameters of the rings play a leading role. Dynamic tensile strain is generated in the inner wall along the impact direction during the impact, while compressive strain is produced on the inner wall in the vertical impact loading direction. By analysing the crack propagation and final failure mode of circular granite, it is found that dynamic tensile failures are generated, crack initiation starts from the inner wall along the impact loading direction, and the outer circle in the vertical direction lags behind. The crack starts early and develops quickly on one side of the transmission bar. Finally, the failure criterion is established on the basis of some assumptions and circular-granite deformation failure characteristics, and the parameters, measured by the Brazilian disk test, are reasonably verified via substitution into the failure criterion equation.

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“…By substituting formula (4) into formula (3), the impact load that the circular granite specimen could bear in the process of impact loading can be obtained by formula (5).…”

Section: Plos Onementioning

confidence: 99%

Section: Plos Onementioning

confidence: 99%

Section: Deduction Of Failure Criterionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study on the dynamic characteristics of rock surrounding a wellbore in energy storage areas during deep geothermal energy mining

et al. 2020

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“…The exploration of oil, gas, and geothermal reservoirs has been getting deeper and deeper in these decades [1,2]. Most of these deep reservoirs are identified as unconventional, including extremely tight sandstone and shale reservoirs [3], for which fracking techniques become a must to start and stimulate the production [4].…”

Section: Introductionmentioning

confidence: 99%

Transient Temperature Impact on Deep Reservoir Fracturing

Jiang

Killough

et al. 2021

Geofluids

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Hydraulic fracturing enables the commercial development of unconventional resources in shales and tight formations. The conductivity and complexity of created fractures are critically dependent on the rheology of fracking fluid and the mechanics properties of rocks. Literatures show that both the rheology of fracturing fluid and fracture propagation dynamics are affected by the temperature of fracturing fluid. Neglecting the temperature transient behaviour may defeat the purpose of fracturing optimization during fracture initiation, propagation, and sand packing. The objective of this paper is to investigate the impact of temperature on fracturing design by studying the transient temperature behaviour across a complex wellbore using numerical modelling by coupling a finite difference heat transfer model with a dynamic fracture propagation model. The study results show that with the injection of cold fracturing fluid, hydraulic fracture propagation is decelerated, and production prediction is thus lessened compared with the case ignoring temperature effect. For multistage fractured wells, fracture geometry enlarges along the fluid flow direction in a horizontal segment. This potentially lowers the cost of hydraulic fracturing designs.

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3D Voronoi Tessellation for the Study of Mechanical Behavior of Rocks at Different Scales

Insana

Barla

2021

Challenges and Innovations in Geomechanics

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A global review of deep geothermal energy exploration: from a view of rock mechanics and engineering

Cited by 61 publications

References 107 publications

Study on the dynamic characteristics of rock surrounding a wellbore in energy storage areas during deep geothermal energy mining

Study on the dynamic characteristics of rock surrounding a wellbore in energy storage areas during deep geothermal energy mining

Transient Temperature Impact on Deep Reservoir Fracturing

3D Voronoi Tessellation for the Study of Mechanical Behavior of Rocks at Different Scales

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