Uniaxial compaction in rigid dies

2003 ◽  
pp. 48-64
Author(s):  
P. Beiss
Keyword(s):  
Uniaxial Compaction

The variation in, and correlation of, the energetic potential and surface areas of powders with degree of uniaxial compaction stress

1990 ◽  
Vol 60 (1) ◽  
pp. 15-26 ◽  
Author(s):  
N.G. Stanley-Wood ◽  
A. Abdelkarim ◽  
M.-E. Johansson ◽  
G. Sadeghnejad ◽  
N. Osborne
Keyword(s):  
Surface Areas ◽  
Compaction Stress ◽  
Uniaxial Compaction

Stress Path Analysis of the Depleted Middle Miocene Clastic Reservoirs in the Badri Field, Gulf of Suez Rift Basin, Egypt

2021 ◽  
Author(s):  
Ahmed E. Radwan ◽  
Souvik Sen
Keyword(s):  
Path Analysis ◽  
Pore Pressure ◽  
Middle Miocene ◽  
Stress Path ◽  
Horizontal Stress ◽  
Gulf Of Suez ◽  
Normal Faulting ◽  
Future Production ◽  
Uniaxial Compaction ◽  
Rate Optimization

Abstract The purpose of this study is to evaluate the reservoir geomechanics and stress path values of the depleted Miocene sandstone reservoirs of the Badri field, Gulf of Suez Basin, in order to understand the production-induced normal faulting potential in these depleted reservoirs. We interpreted the magnitudes of pore pressure (PP), vertical stress (Sv), and minimum horizontal stress (Shmin) of the syn-rift and post-rift sedimentary sequences encountered in the studied field, as well as we validated the geomechanical characteristics with subsurface measurements (i.e. leak-off test (LOT), and modular dynamic tests) (MDT). Stress path (ΔPP/ΔShmin) was modeled considering a pore pressure-horizontal stress coupling in an uniaxial compaction environment. Due to prolonged production, The Middle Miocene Hammam Faraun (HF) and Kareem reservoirs have been depleted by 950-1000 PSI and 1070-1200 PSI, respectively, with current 0.27-0.30 PSI/feet PP gradients as interpreted from initial and latest downhole measurements. Following the poroelastic approach, reduction in Shmin is assessed and reservoir stress paths values of 0.54 and 0.59 are inferred in the HF and Kareem sandstones, respectively. As a result, the current rate of depletion for both Miocene reservoirs indicates that reservoir conditions are stable in terms of production-induced normal faulting. Although future production years should be paid more attention. Accelerated depletion rate could have compelled the reservoirs stress path values to the critical level, resulting in depletion-induced reservoir instability. The operator could benefit from stress path analysis in future planning of infill well drilling and production rate optimization without causing reservoir damage or instability.

scholarly journals Construction of synthetic carbonate plugs: A review and some recent developments

2019 ◽  
Vol 74 ◽  
pp. 29 ◽  
Author(s):  
Jhonatan Jair Arismendi Florez ◽  
Jean Vicente Ferrari ◽  
Mateus Michelon ◽  
Carina Ulsen
Keyword(s):  
Oil Recovery ◽  
Mineralogical Composition ◽  
Carbonate Reservoir ◽  
Particle Sizes ◽  
Petrophysical Properties ◽  
Deep Waters ◽  
Viable Solution ◽  
Recent Developments ◽  
Porosity And Permeability ◽  
Uniaxial Compaction

Plugs are cylindrical rocks with known dimensions that are extracted typically from reservoir formations with representative mineralogical compounds, petrophysical properties and oilfield fluids. They are used in the laboratory to understand the behaviour of oil in reservoirs. One of their applications is to study the screening of chemicals, such as surfactants and polymers, for enhanced oil recovery research before being applied in the reservoir. Many of Brazil’s pre-salt basins are located in ultra-deep waters, and the high heterogeneities of its offshore carbonate reservoirs make the extraction of representative rock samples difficult, risky and expensive. The literature reports the construction of synthetic plug samples that reproduce rocks as an alternative and viable solution for this issue. However, there is a lack of publications that focus on the construction of representative carbonate plugs that considers both the mineralogical composition and petrophysics properties, such as porosity and permeability. In this work, the construction of synthetic plugs is studied, using a combination of published methodologies to achieve an alternative construction of synthetic carbonate plugs for laboratory scale studies. Using a procedure based on the use of pulverized rock matrices with known particle sizes, uniaxial compaction, and probable CaCO3 solubility control by changing temperature and pH, it was possible to obtain synthetic carbonate plugs with a similar mineralogy to the natural carbonate reservoir. However, further studies are necessary to obtain more controlled petrophysical properties of such samples.

Cold isostatic compaction of nano-size powders: Surface densification and dimensional asymmetry

2002 ◽  
Vol 17 (11) ◽  
pp. 2794-2801 ◽  
Author(s):  
Wenxia Li ◽  
John J. Lannutti
Keyword(s):  
Density Distribution ◽  
Cold Isostatic Pressing ◽  
Low Density ◽  
Density Gradients ◽  
Distribution Width ◽  
Quantitative Measurements ◽  
Isostatic Compaction ◽  
Variable Surface ◽  
Uniaxial Compaction ◽  
Final Compaction

Cold isostatic pressing (CIP) is often used in the compaction of nano-sized powders. For technological reasons, however, uniaxial pressing prior to CIP takes place. This paper reveals the first quantitative measurements of density gradients within and the asymmetric sintering response of nanoscale zirconia compacts formed by (i) simple uniaxial compaction and (ii) specific ratios of uniaxial and CIP pressure. We find that CIP forms an exterior “skin” of higher but variable surface density and decreases the width of the density distribution. It does not eliminate density gradients; nonuniform shrinkage still occurs during sintering. The high- and low-density zones (the moving and fixed ram ends, respectively) that form during uniaxial compaction are reversed during CIP. Considering both density distribution width and spring-back cracking, the “best” uniaxial-CIP pressure combination is 1–20 ksi for this particular powder and an L/D of 1.0. The greater final compaction of the low-density zone during CIP causes relatively large variations in final dimensions (nearly 400 microns) in spite of the smaller density distribution width. The usually neglected uniaxial pressing step has definite technological impacts on the production of nanostructured components via compaction.

Analysis of Densification Process and Structure of PM Al-Mg-Si-Cu-Fe and Al-Zn-Mg-Cu-Sn Alloys

2014 ◽  
Vol 59 (1) ◽  
pp. 17-23 ◽  
Author(s):  
R. Bidulský ◽  
J. Bidulská ◽  
M. Actis Grande
Keyword(s):  
Test Specimen ◽  
Hardened Steel ◽  
Pressing Pressure ◽  
Metal Powders ◽  
Compaction Process ◽  
Cylinder Test ◽  
Die Compaction ◽  
Uniaxial Compaction ◽  
Compaction Behaviour

Abstract The paper is focused on the role of the pressing pressure on the densification behaviour of PM aluminium alloys. Commercially aluminium based powders Al-Mg-Si-Cu-Fe and Al-Zn-Mg-Cu-Sn were used as materials to be investigated. The apparent density of the powder mixes was determined according to MPIF St. 04. A set of cylinder test specimen 55x10x10 mm3 was uniaxially pressed in a floating hardened steel die. Compaction pressures ranged from 50 MPa up to 700 MPa. Considering the densification of metal powders in uniaxial compaction, quantification of aluminium compaction behaviour was performed. The compressibility behaviour was evaluated, considering the effect on specimens, as well as on their microstructure. The development of compressibility values with pressing pressure enables to characterize the effect of particles geometry and matrix plasticity on the compaction process.

Numerical Analysis of Metal Powders in Uniaxial Compaction

2008 ◽  
Vol 591-593 ◽  
pp. 218-222
Author(s):  
Magna Monteiro Schaerer ◽  
Deane Roehl ◽  
José Luís Silveira
Keyword(s):  
Mechanical Properties ◽  
Numerical Analysis ◽  
Yield Function ◽  
Densification Behavior ◽  
Metal Powders ◽  
Elastoplastic Model ◽  
High Quality ◽  
Powder Consolidation ◽  
Function Coefficient ◽  
Uniaxial Compaction

Powder consolidation constitutes an important step in the manufacture of products of high quality and precision. To obtain these components, with desired forms and final mechanical properties, it is of extreme importance to have knowledge about the processes to obtain powders, compacting and sintering. The objective of this work is to verify which model, obtained from the literature, better describes the compaction densification behavior of iron powder in closed-die. Doraivelu’s criterion was carried through the method of the finite elements with the implementation of an elastoplastic model with hardening. The influence of the yield function coefficient against the relative density was evaluated, as well as, the yield function in the hydrostatic space.

scholarly journals In situ grain fracture mechanics during uniaxial compaction of granular solids

2018 ◽  
Vol 112 ◽  
pp. 273-290 ◽  
Author(s):  
R.C. Hurley ◽  
J. Lind ◽  
D.C. Pagan ◽  
M.C. Akin ◽  
E.B. Herbold
Keyword(s):  
Fracture Mechanics ◽  
Granular Solids ◽  
Uniaxial Compaction

scholarly journals Magnetic Properties of Metal - Polymer Composites for Ac Applications at High Frequencies

2017 ◽  
Vol 60 (2) ◽  
Author(s):  
Jorge Alejandro Verduzco ◽  
Carlos Ernesto Borja ◽  
Víctor Hugo López ◽  
Luis Rafael Olmos ◽  
José Israel Betancourt ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Polymer Composites ◽  
Polymer Composite ◽  
Magnetic Permeability ◽  
Soft Magnetic Properties ◽  
Particle Sizes ◽  
Soft Magnetic ◽  
High Frequencies ◽  
Uniaxial Compaction ◽  
Metal Polymer

<p>This paper presents the soft magnetic properties of the Fe-, Ni-, Co- and Fe-Co-Ni polymer composites. The composites were ob-tained with Fe, Ni and Co powders (99.9% purity) with particle sizes of 150, 10 and 2 mm, respectively. Ring-shaped samples were ob-tained using uniaxial compaction at 91 MPa. The Fe-Co-Ni-polymer composite has the highest value of the magnetic permeability (μ=54) <br />at 107 Hz and saturation magnetization (Ms=10000 Am2Kg-1) higher than the Ni-polymer composite (4100 Am2Kg-1).</p>

scholarly journals Impact of sintering method on certain properties of titanium dioxide nanopowder materials

2017 ◽  
Vol 49 (1) ◽  
pp. 99-105 ◽  
Author(s):  
Svetlana Porozova ◽  
Alexander Gurov ◽  
Maxim Kachenuk ◽  
Andrey Smetkin ◽  
Oleg Kamenschikov
Keyword(s):  
Electron Microscopy ◽  
Titanium Dioxide ◽  
Plasma Sintering ◽  
Combination Scattering ◽  
Color Density ◽  
Spark Plasma ◽  
Uniaxial Compaction ◽  
Isothermal Tempering ◽  
Sintering Method ◽  
Scanning Electron

Titanium dioxide nanopowder samples consolidated by method of cold uniaxial compaction at 200 MPa and conventionally sintered in air at 1300?? with isothermal tempering during 60 minutes or spark-plasma sintering at 1300?? and 30 MP? were studied using the method of light combination scattering spectroscopy (Raman spectroscopy) and scanning electron microscopy. The samples were found to differ significantly in terms of color, density, phase composition and microstructure.

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