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An Experimental Investigation into Effects of Shale Hydration on Breakdown Pressure and the Fracture Characteristics During Hydraulic Fracture Initiation
Hydraulic fracturing promotes the shale gas revolution worldwide. Since most of the fracturing fluids used now are water-based, shale hydration could...
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Modeling the Impact of Thermal Stresses Induced by Wellbore Cooldown on the Breakdown Pressure and Geometry of a Hydraulic Fracture
AbstractWellbore cooldown is often employed before well stimulation and/or hydraulic fracture stress testing in Enhanced Geothermal Systems and...
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In situ high-temperature behaviour and breakdown conditions of uvite at room pressure
The thermal behaviour of an uvite from San Piero in Campo (Elba Island, Italy) was investigated at room pressure through in situ high-temperature...
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Omphacite breakdown: nucleation and deformation of clinopyroxene-plagioclase symplectites
The breakdown of omphacite plays an important role in the exhumation and retrogression of eclogites. Additionally, metamorphic reactions associated...
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Midwinter breakdown of ENSO climate impacts in East Asia
The El Niño-Southern Oscillation (ENSO) influence on the East Asian winter monsoon (EAWM) exhibits remarkable non-stationarity on subseasonal...
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A Laboratory Observation on the Acoustic Emission Point Cloud Caused by Hydraulic Fracturing, and the Post-pressure Breakdown Hydraulic Fracturing Re-activation due to Nearby Fault
We re-investigate the laboratory acoustic emission (AE) source location from a hydraulic fracturing test. This test produces temporally...
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Constant Pressure Injection
In practical hydraulic fracturing, limited by the operating power of the syringe pump and long transportation of pipelines, it is often difficult to...
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The Effects of High Pressure
Pressure increases with depth in the earth, to a maximum at the centre. The rate of increase depends on the material present along the path followed;...
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Study on Breakdown Pressure in Hydraulic Fracturing Process of Hard Rock Based on Numerical Simulation
Pre-conditioning by hydraulic fracturing is a vital work in block caving mining of hard-rock metal mine, and breakdown pressure is one of the...
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Breakdown Pressure and Propagation Surface of a Hydraulically Pressurized Circular Notch Within a Rock Material
Rock masses contain pre-existing cracks. These cracks are not usually considered when predicting the maximum injection pressure, i.e. the breakdown...
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Effect of Pressure and Stress Cycles on Fluid Flow in Hydraulically Fractured, Low-Porosity, Anisotropic Sandstone
Hydraulic fracture in deep rock masses is used across a variety of disciplines, from unconventional oil and gas to geothermal exploration. The...
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The origin of Na-alkaline lavas revisited: new constraints from experimental melting of amphibole-rich metasomes+lherzolite at uppermost mantle pressure
We present a new experimental dataset for reaction experiments between natural amphibole-clinopyroxene metasomes (hornblendite) and synthetic...
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In situ high-temperature behaviour of fluor-elbaite: breakdown conditions and products
The thermal behaviour of a fluor-elbaite from Minas Gerais (Brazil) was investigated at room pressure through in situ high-temperature X-ray powder...
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Evidence of Ultrahigh-Pressure Evolution of Garnet Peridotites in the Polar Urals
AbstractSegregations of carbonates in association with chlorapatite were discovered in garnet peridotites of the Marun-Keu eclogite–gneiss complex...
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On the Mechanism of High-Voltage Pulsed Fragmentation from Electrical Breakdown Process
With the deepening of the development of natural resources, the difficulty of rock breaking is increasing. Novel efficient rock-breaking technology...
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Effect of Borehole Radial Pore Pressure Gradient on the Initiation and Propagation of Sandstone Hydraulic Fractures
The initial pore pressure gradient along the borehole radial direction affects the initiation and instability of a hydraulic crack tip and its...
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Prediction of Fracturing Pressure and Parameter Evaluations at Field Practical Scales
Hydraulic fracturing pressure is one of the key criteria in defining the pum** schedule and in dimensioning surface plants for fracturing...
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The stability of antigorite in subduction zones revisited: the effect of F on antigorite stability and its breakdown reactions at high pressures and high temperatures, with implications for the geochemical cycles of halogens
We present new experimental data on the effect of F on the stability of antigorite and its breakdown products at high pressures (2–6 GPa) and high...
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Two New Methods for Defining Shut-In Pressure in Hydraulic Fracturing Tests
Hydraulic fracturing is one of the most common methods to determine in situ rock stress. The interpretation of the shut-in pressure to determine the...
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Initiation Pressure and Location of Fracture Initiation in Elliptical Wellbores
Due to the shear failure caused by the compressive stress concentration in the wellbore wall and the non-isotropy of the in situ stresses, the actual...
