Rock Fractures And Fluid Flow Contemporary Understanding And Applications Pdf

rock fractures and fluid flow contemporary understanding and applications pdf

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Rock mass is a heterogeneous material included joints, fractures and faults.

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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. To alleviate these potential problems and to economically develop these challenging environments, a new stimulation technology, which has been proven to be successful for Hot Dry Rock HDR reservoirs, has been investigated in this paper in the context of tight gas reservoir stimulation. The paper first presents a 3D model in which naturally fractured, tight gas reservoirs can be simulated by integrating available log and core data. Simulated natural fractures are then treated considering a novel fracture propagation and shear dilation concept.

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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.

Fractures, fluid flow and mineralization: an introduction

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.

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. The validated elastic—plastic contact model and the multi-scale surface roughness characterization methods, as well as the nonlinear correlation between the specific stiffness and the multi-scale surface roughness presented in this study, are helpful for evaluating the dependence of mechanical behaviors of rock fractures on its multi-scale surface roughness. This is a preview of subscription content, access via your institution.

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Rock fractures and fluid flow: contemporary understanding and applications

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Probing complex geophysical geometries with chattering dust

Introduction

Стратмор сменил положение. Вцепившись в левую створку, он тянул ее на себя, Сьюзан толкала правую створку в противоположном направлении. Через некоторое время им с огромным трудом удалось расширить щель до одного фута. - Не отпускай, - сказал Стратмор, стараясь изо всех сил.  - Еще чуточку. Сьюзан удалось протиснуть в щель плечо.

Приходи поиграть. - На улице еще темно, - засмеялся. - А-ах, - сладко потянулась.  - Тем более приходи. Мы успеем выспаться перед поездкой на север.

 - Вы ждете рекомендаций. Что ж, пожалуйста. Хватит путаться у нас под ногами, вот моя рекомендация. - Спокойно, Джабба, - предупредил директор. - Директор, - сказал Джабба, - Энсей Танкадо владеет нашим банком данных.

 - Посмотрите уран. Его сверхкритическую массу. - М-м… сто десять фунтов, - сказала Соши. - Сто десять? - оживился Джабба.  - Сколько будет сто десять минус тридцать пять и две десятых.

Они глупы и тщеславны, это двоичные самовлюбленные существа. Они плодятся быстрее кроликов. В этом их слабость - вы можете путем скрещивания отправить их в небытие, если, конечно, знаете, что делаете. Увы, у этой программы такого тщеславия нет, у нее нет инстинкта продолжения рода.

И они делают их все более и более миниатюрными, - подумал. Прикрыв глаза, давая им долгожданный отдых, он вдруг почувствовал, что кто-то тянет его за ногу. - Джабба.

Глаза ее были полны слез.

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