Rock Fractures And Fluid Flow Contemporary Understanding And Applications PdfBy Masbitite In and pdf 30.11.2020 at 06:31 7 min read
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- Rock fractures and fluid flow: contemporary understanding and applications
- Probing complex geophysical geometries with chattering dust
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Metrics details. When water is injected into a fracture-dominated reservoir that is cooler or hotter than the injected water, the reservoir permeability is expected to be altered by the injection-induced thermo-mechanical effects, resulting in the redistribution of fluid flow in the reservoir. These effects are important to be taken into account when evaluating the performance and lifetime particularly of Enhanced Geothermal Systems EGS. Conducting a moment analysis on the recovered tracer residence time distribution RTD curves, we observe, after hot water injection, a significant decrease in the total tracer recovery. This recovery decrease strongly suggests that fluid flow was redistributed in the studied rock volume and that the majority of the injected water was lost to the far-field.
Rock fractures and fluid flow: contemporary understanding and applications
The modern energy economy and environmental infrastructure rely on the flow of fluids through fractures in rock. Yet this flow cannot be imaged directly because rocks are opaque to most probes. Here we apply chattering dust, or chemically reactive grains of sucrose containing pockets of pressurized carbon dioxide, to study rock fractures. As a dust grain dissolves, the pockets burst and emit acoustic signals that are detected by distributed sets of external ultrasonic sensors that track the dust movement through fracture systems. The dust particles travel through locally varying fracture apertures with varying speeds and provide information about internal fracture geometry, flow paths and bottlenecks. Chattering dust particles have an advantage over chemical sensors because they do not need to be collected, and over passive tracers because the chattering dust delineates the transport path. The current laboratory work has potential to scale up to near-borehole applications in the field.
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Probing complex geophysical geometries with chattering dust
Analysis of rock fracture deformation by normal stress is important for quantifying hydromechanical properties of fractured rocks that are related to a large number of geophysical problems and geoengineering applications. Experimental and numerical results for the closure of crystalline rock fractures subject to normal stress are presented in this study. Using the validated elastic—plastic model, we investigate the correlation between fracture-specific stiffness and multi-scale surface roughness. The results show that the elastic—plastic contact model is effective and precise in modeling the closure of crystalline rock fractures, which matches better with the test results than the elastic model. The specific stiffness is nonlinearly correlated with the multi-scale surface roughness that possibly follows a power law.
Hossain, M. Conventional, cross-linked gel, hydraulic fracture treatments face several challenges in naturally fractured, tight gas, hard rock environments. These challenges include the potential for fracture complexity, pre-mature screen-out caused by pressure dependent leak-off and the likelihood of severe gel induced formation damage.
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Rock mass is a heterogeneous material included joints, fractures and faults. Faults are the most important discontinuous fractures in the earth's crust in which the two sides of the fracture have moved relative to each other. The purpose of this research is that if the non-persistent faults were situated adjacent to each other, how would be the shear failure mechanism of Rock Bridge surrounded between the faults.
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Rock fractures and fluid flow: contemporary understanding and applications / Committee on Fracture Characterization and Fluid Flow [et al.]. p. cm. Includes.
Not a MyNAP member yet? Register for a free account to start saving and receiving special member only perks. Washington, D. The members of the committee responsible for the report were chosen for their special competences and with regard for appropriate balance. This report has been reviewed by a group other than the authors according to procedures approved by a Report Review Committee consisting of members of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine.