pore collapse and grain crushing on ultrasonic

On the porescale mechanisms leading to brittle and

On the porescale mechanisms leading to brittle and

matrix [31]. Various different ways to model pore collapse also have been proposed and among them, Wang et al. [29] used grain shrinkage to simulate intragranular cracking and grain crushing processes. In these models, porosity is derived based on the spaces generated from the random assembly of the circular disks or spherical particles.

Stress distribution during cold compression of a quartz

Stress distribution during cold compression of a quartz

We report new experimental results that quantify the stress distribution within a quartz aggregate during pore collapse and grain crushing. The samples were probed with synchrotron Xray diffraction as they were compressed in a multianvil deformation apparatus at room temperature from low pressure (tens of megapascal) to pressures of a few

Computational Geomechanics Clemson University

Computational Geomechanics Clemson University

In addition to accumulating plastic dilation due to microcrack growth, grain rotation, and sliding, these materials may exhibit significant inelastic compaction due to pore collapse or grain crushing when the confining pressure is sufficiently high.

Evolution of permeability across the transition from

Evolution of permeability across the transition from

with respect to the linearelastic behavior and marks the onset of grain crushing and pore collapse, [Brace, 1978 Zhang et al., 1990a Menendez et al., 1996]. Under triaxial deformation, samples can fail by shear localization or aclastic flow [Wong et al., 1997]. C* indies the stress state at which the deviatoric stress field Figure 1.

Insights from an Extensive Laboratory Geomechanics

Insights from an Extensive Laboratory Geomechanics

Such high levels of depletion can produce severe reservoir compaction and pore collapse, leading to a rapid loss in permeability, generation of fines (byproducts of pore collapse and/or grain crushing), subsidence, wellbore instability, damage to well completion integrity, and loss of caprock containment.

Computational Geomechanics Clemson University

Computational Geomechanics Clemson University

In addition to accumulating plastic dilation due to microcrack growth, grain rotation, and sliding, these materials may exhibit significant inelastic compaction due to pore collapse or grain crushing when the confining pressure is sufficiently high.

MTS Acoustic Emissions

MTS Acoustic Emissions

These changes have the potential to produce ultrasonic events. By monitoring and recording acoustic emissions, test professionals gain new insight into specimen events such as microcracking, pore collapse and grain boundary sliding. Ultimately, the data helps create more accurate models of rock reservoirs and formations.

Compaction bands due to grain crushing in porous rocks: A

Compaction bands due to grain crushing in porous rocks: A

Abstract Grain crushing and pore collapse are the principal micromechanisms controlling the physics of compaction bands in porous rocks. Several constitutive models have been previously used to predict the formation and propagation of these bands. However, they do not account directly for the physical processes of grain crushing and pore collapse.

Separation of Tensile and Shear Cracks Based on Acoustic

Separation of Tensile and Shear Cracks Based on Acoustic

Pore collapse and grain crushing prevail in the process zone of sandstone and the amount of tensile cracks is much smaller than in granite. References. Glaser, S.D. & Nelson, P.P. 1992. Acoustic emissions produced by discrete fracture in rock. Part 2.

Characterization and Analysis of Porosity and Pore

Characterization and Analysis of Porosity and Pore

Characterization and Analysis of Porosity and Pore Structures Lawrence M. Anovitz. sonic and neutron logs (2007) noted that sample cleaning and mass conservation during the crushing and grain volume measurement were crucial to an accurate measurement.

Modeling the hydromechanical responses of strip and

Modeling the hydromechanical responses of strip and

Modeling the hydromechanical responses of strip and circular punch loadings on watersaturated collapsible geomaterials may exhibit significant inelastic compaction due to pore collapse or grain crushing when the confining pressure is sufficiently high. This distinct micromechanical feature

Effects of pore collapse and grain crushing on ultrasonic

Effects of pore collapse and grain crushing on ultrasonic

2 Effects of pore collapse and grain crushing on Y. Gue´guen, and A. Schubnel (2007), Effects of pore collapse and grain crushing on ultrasonic velocities and 31 V pores with large aspect

Core Laboratories: Acoustic Velocity System

Core Laboratories: Acoustic Velocity System

Back University Training Equipment Acoustic Velocity System. The Acoustic Velocity System, a benchtop system designed to acquaint the student with the acoustic properties of reservoir rocks, complete laptop based data acquisition system for 1 inch diameter plugsize samples.

Effects of pore collapse and grain crushing on ultrasonic

Effects of pore collapse and grain crushing on ultrasonic

At a critical effective confining pressure P*, a large mechanical decrease of porosity was observed that was due to pore collapse and grain crushing. Theoretically, two different processes are affecting the elastic wave velocities in counteracting ways during aclastic compaction: cracking

Compressive strength of rocks PetroWiki

Compressive strength of rocks PetroWiki

Effect of pore fluids. Fluids can alter rock mechanical properties through fluid pressure, chemical reactions with mineral surfaces, and by lubriing moving surfaces. These effects are discussed in Pore fluid effects on rock mechanics. Effect of grain size and texture. In granular rocks, grain size also influences strength.

Deformation bands in porous carbonate grainstones  CORE

Deformation bands in porous carbonate grainstones CORE

In contrast, laboratory studies on the mechanics of deformation bands in limestones identified grain crushing, pore collapse and mechanical twinning as the micromechanisms leading to strain localization.ud ud Here, we present a multidisciplinary field and laboratory study performed on a Cretaceous carbonate grainstone to investigate the

Compressive strength of rocks PetroWiki

Compressive strength of rocks PetroWiki

Effect of pore fluids. Fluids can alter rock mechanical properties through fluid pressure, chemical reactions with mineral surfaces, and by lubriing moving surfaces. These effects are discussed in Pore fluid effects on rock mechanics. Effect of grain size and texture. In granular rocks, grain size also influences strength.

Spatial distribution of micrometre‐scale porosity and

Spatial distribution of micrometre‐scale porosity and

original pore‐lining chlorite morphology as a result of fault deformation. tude of permeability can be degraded due to pore collapse, grain crushing, and cement precipitation during deformation Alternatively, the magnitude of permeability can be enhanced through the formation of grain‐scale microfractures (Anders, Laubach, & Scholz

Estimation of pore microstructure by using the static and

Estimation of pore microstructure by using the static and

The variations of the static and dynamic moduli of porous rocks as a function of differential pressure have been described in terms of pore microstructure, i.e., the effects of cracks (soft pores) and intergranular (stiff) pores. Specifically, the first play a major role on the elastic properties of rocks.

Leonardo Meireles – Researcher – DTU Technical

Leonardo Meireles – Researcher – DTU Technical

We identified open fractures, pore collapse and microfractures from the NMR results. Plugs saturated with CaCl2 brine behaved more ductile than the CaCO3 saturated ones. NMR allowed a better insight on the degree of plastic deformation in triaxial tests than interpretation of

Spatial distribution of micrometre‐scale porosity and

Spatial distribution of micrometre‐scale porosity and

original pore‐lining chlorite morphology as a result of fault deformation. tude of permeability can be degraded due to pore collapse, grain crushing, and cement precipitation during deformation Alternatively, the magnitude of permeability can be enhanced through the formation of grain‐scale microfractures (Anders, Laubach, & Scholz

Simulation of localized compaction in highporosity

Simulation of localized compaction in highporosity

mechanics of compaction, such as bond/grain breakage and pore collapse. A notable exception is the work by Das et al. [16,21],inwhich the explicit incorporation of grain crushing allowed the authors to point out the importance of the rheological response on the simulation of both onset and propagation of compaction bands.

On PoreScale Imaging and Elasticity of Unconsolidated

On PoreScale Imaging and Elasticity of Unconsolidated

Understanding the elastic properties of unconsolidated granular media is crucial for interpreting seismic and sonic log data in soils and unconsolidated petroleum reservoirs. Rock and soil deformations are often estimated indirectly using rock physics models that relate changes in elastic properties to pore compliance. The complex microstructure of geological materials in represented by simple

Modeling the hydromechanical responses of strip and

Modeling the hydromechanical responses of strip and

Modeling the hydromechanical responses of strip and circular punch loadings on watersaturated collapsible geomaterials may exhibit significant inelastic compaction due to pore collapse or grain crushing when the confining pressure is sufficiently high. This distinct micromechanical feature

Effect of Loading Path and Porosity on the Failure Mode of

Effect of Loading Path and Porosity on the Failure Mode of

The onset of grain crushing and pore collapse was marked by a surge in acoustic emission activity. A Hertzian fracture mechanics model was formulated to analyze the roles of porosity, grain size and fracture toughness in controlling the onset of hydrostatic and shearenhanced compaction.

On PoreScale Imaging and Elasticity of Unconsolidated

On PoreScale Imaging and Elasticity of Unconsolidated

Understanding the elastic properties of unconsolidated granular media is crucial for interpreting seismic and sonic log data in soils and unconsolidated petroleum reservoirs. Rock and soil deformations are often estimated indirectly using rock physics models that relate changes in elastic properties to pore compliance. The complex microstructure of geological materials in represented by simple

What Causes Grain Elevator Explosions?

What Causes Grain Elevator Explosions?

Mar 13, 2018 · Grain elevator explosions can cause serious injury and can kill. Over the past 35 years, there have been more than 500 explosions in grain handling facilities in this country. Those accidents injured more than 675 people and have killed 180. The types of injuries that may occur in a grain explosion are: Primary injuries from the blast wave itself

Casting defect Wikipedia

Casting defect Wikipedia

A casting defect is an undesired irregularity in a metal casting process. Some defects can be tolerated while others can be repaired, otherwise they must be eliminated. They are broken down into five main egories: gas porosity, shrinkage defects, mold material defects, pouring metal defects, and metallurgical defects.

Fluid/Rock Interactions in Porous Carbonate Rocks: An

Fluid/Rock Interactions in Porous Carbonate Rocks: An

An Integrated Mechanical, Ultrasonic and Microstructural Study Claudio Delle Piane1, an integrated mechanical, ultrasonic and microstructural study ENERGY . Claudio Delle Piane, Ben Clennell, Jeremie Dautriat and Graham Price Pervasive grain crushing and pore collapse . Before . After . Microstructure: triaxial test

Experimental Investigation of Elastic Weakening Effects

Experimental Investigation of Elastic Weakening Effects

Experimental Investigation of Elastic Weakening Effects from Water Adsorption in Sedimentary and are granular rocks of same grain range in porosity, permeability and pore entry diameter.

Wellbore stability analysis in porous carbonate rocks

Wellbore stability analysis in porous carbonate rocks

Wellbore stability analysis in porous carbonate rocks using cap models L. C. Coelho1, A. C. Soares2, consists of grain debonding and crushing caused by compressive stress Pore Collapse Stress 20% Pore Collapse Stress 24%

4.4 Compression failure: Pore collapse GitHub Pages

4.4 Compression failure: Pore collapse GitHub Pages

4. 4 Compression failure: Pore collapse. If compression stresses are high enough, grains can crush filling the pore space. Pore collapse may happen in nature due to rock burial and also in petroleum engineering during reservoir depletion. In both cases effective stresses increase in all directions.

Porosity evolution in oilprone source rocks

Porosity evolution in oilprone source rocks

Porosity evolution in oilprone source rocks Saeed Zargaria, Karen Lyn Canterb, Manika Prasada,⇑ a Colorado School of Mines, 1600 Arapahoe St., Golden, CO 80401, USA bWhiting Petroleum Corporation, 1700 Broadway, Suite 2300, Denver, CO 80290, USA highlights Organic rich shales contain considerable amount of porosity in the oil window.

MTS Acoustic Emissions

MTS Acoustic Emissions

These changes have the potential to produce ultrasonic events. By monitoring and recording acoustic emissions, test professionals gain new insight into specimen events such as microcracking, pore collapse and grain boundary sliding. Ultimately, the data helps create more accurate models of rock reservoirs and formations.

CiteSeerX — 2 Effects of pore collapse and grain crushing

CiteSeerX — 2 Effects of pore collapse and grain crushing

At first, increase in hydrostatic pressure was 9 accompanied by a simultaneous increase of both Vp and Vs as expected. At a critical 10 effective confining pressure P*, a large mechanical decrease of porosity was observed that 11 was due to pore collapse and grain crushing.

Computational Geomechanics Clemson University

Computational Geomechanics Clemson University

In addition to accumulating plastic dilation due to microcrack growth, grain rotation, and sliding, these materials may exhibit significant inelastic compaction due to pore collapse or grain crushing when the confining pressure is sufficiently high.

On the porescale mechanisms leading to brittle and

On the porescale mechanisms leading to brittle and

matrix [31]. Various different ways to model pore collapse also have been proposed and among them, Wang et al. [29] used grain shrinkage to simulate intragranular cracking and grain crushing processes. In these models, porosity is derived based on the spaces generated from the random assembly of the circular disks or spherical particles.

Experimental Investigation of Elastic Weakening Effects

Experimental Investigation of Elastic Weakening Effects

Experimental Investigation of Elastic Weakening Effects from Water Adsorption in Sedimentary and are granular rocks of same grain range in porosity, permeability and pore entry diameter.

CORE

CORE

The chalk was described by a double yield model, where first yield (linear limit) was associated with the onset of bond degradation and second yield marked pore collapse and the start of grain crushing. At large strains, beyond second yield, the chalk behaved as a particulate, granular soil.

Simulation of localized compaction in highporosity

Simulation of localized compaction in highporosity

mechanics of compaction, such as bond/grain breakage and pore collapse. A notable exception is the work by Das et al. [16,21],inwhich the explicit incorporation of grain crushing allowed the authors to point out the importance of the rheological response on the simulation of both onset and propagation of compaction bands.

Effect of Loading Path and Porosity on the Failure Mode of

Effect of Loading Path and Porosity on the Failure Mode of

The onset of grain crushing and pore collapse was marked by a surge in acoustic emission activity. A Hertzian fracture mechanics model was formulated to analyze the roles of porosity, grain size and fracture toughness in controlling the onset of hydrostatic and shearenhanced compaction.

Digital rock physics: numerical prediction of pressure

Digital rock physics: numerical prediction of pressure

We experimentally measure pressuredependent ultrasonic velocities and the pore size distribution. we hypothesize that the numerical overprediction is attributable to the smallest pores and graintograin contacts that are missing in the images. A hydrostatic compression test on Berea sandstone has shown that grain crushing and pore

4.4 Compression failure: Pore collapse GitHub Pages

4.4 Compression failure: Pore collapse GitHub Pages

4. 4 Compression failure: Pore collapse. If compression stresses are high enough, grains can crush filling the pore space. Pore collapse may happen in nature due to rock burial and also in petroleum engineering during reservoir depletion. In both cases effective stresses increase in all directions.

A GUIDEBOOK TO PARTICLE SIZE ANALYSIS Horiba

A GUIDEBOOK TO PARTICLE SIZE ANALYSIS Horiba

and affect the apparent size distribution. Additionally, ultrasonic energy can be applied to improve the dispersion of agglomerates which can significantly change the result. TESTING REPRODUCIBILITY There are currently two internationally accepted standards written on the use of laser diffraction: ISO 13320 (ref. 9) and USP<429> (ref. 10).

Snap, Crackle, Pop: What Rice Cereal Can Tell Us About

Snap, Crackle, Pop: What Rice Cereal Can Tell Us About

Oct 12, 2018 · The fluid naturally got pulled upward through microscopic pores in each puffed rice grain, the same effect that helps draw water up inside trees. They found that the cereal experienced repeated incremental collapses, as well as loud clicks from abrupt collapses of wet puffed rice, which they dubbed "ricequakes."

Effective Elastic Properties of Cracked Solids: An

Effective Elastic Properties of Cracked Solids: An

May 14, 2013 · Effective Elastic Properties of Cracked Solids: An Experimental Investigation. Y. Guéguen, and A. Schubnel (2007), Effects of pore collapse and grain crushing on ultrasonic velocities and vp/vs, Journal of (2011), Effective elastic properties of cracked rocks an overview, in, mechanics of crustal rocks, CISM Courses and