Modeling of effective pressure effect on porous reservoir rocks

2009 ◽  
Author(s):  
Fuyong Yan ◽  
De‐Hua Han
Keyword(s):  
Pressure Effect ◽  
Effective Pressure ◽  
Reservoir Rocks ◽  
Porous Reservoir

scholarly journals Synchrotron 4D X-Ray Imaging Reveals Strain Localization at the Onset of System-Size Failure in Porous Reservoir Rocks

2021 ◽  
Author(s):  
Neelima Kandula ◽  
Jessica McBeck ◽  
Benoît Cordonnier ◽  
Jérôme Weiss ◽  
Dag Kristian Dysthe ◽  
...  
Keyword(s):  
Strain Localization ◽  
Brittle Failure ◽  
System Size ◽  
Pore Collapse ◽  
X Ray ◽  
Porosity Evolution ◽  
Reservoir Rocks ◽  
Strain Components ◽  
Porous Reservoir ◽  
Incremental Strain

AbstractUnderstanding the mechanisms of strain localization leading to brittle failure in reservoir rocks can shed light on geomechanical processes such as porosity and permeability evolution during rock deformation, induced seismicity, fracturing, and subsidence in geological reservoirs. We perform triaxial compression tests on three types of porous reservoir rocks to reveal the local deformation mechanisms that control system-size failure. We deformed cylindrical samples of Adamswiller sandstone (23% porosity), Bentheim sandstone (23% porosity), and Anstrude limestone (20% porosity), using an X-ray transparent triaxial deformation apparatus. This apparatus enables the acquisition of three-dimensional synchrotron X-ray images, under in situ stress conditions. Analysis of the tomograms provide 3D distributions of the microfractures and dilatant pores from which we calculated the evolving macroporosity. Digital volume correlation analysis reveals the dominant strain localization mechanisms by providing the incremental strain components of pairs of tomograms. In the three rock types, damage localized as a single shear band or by the formation of conjugate bands at failure. The porosity evolution closely matches the evolution of the incremental strain components of dilation, contraction, and shear. With increasing confinement, the dominant strain in the sandstones shifts from dilative strain (Bentheim sandstone) to contractive strain (Adamswiller sandstone). Our study also links the formation of compactive shear bands with porosity variations in Anstrude limestone, which is characterized by a complex pore geometry. Scanning electron microscopy images indicate that the microscale mechanisms guiding strain localization are pore collapse and grain crushing in sandstones, and pore collapse, pore-emanated fractures and cataclasis in limestones. Our dynamic X-ray microtomography data brings unique insights on the correlation between the evolutions of rock microstructure, porosity evolution, and macroscopic strain during the approach to brittle failure in reservoir rocks.

The Impact of Irreducible Water on Stress-Sensitivity of Gas Reservoir Rocks

2012 ◽  
Vol 246-247 ◽  
pp. 472-475
Author(s):  
Hao Xu ◽  
Zhi Ping Li ◽  
Hua Jun Hu
Keyword(s):  
Stress Sensitivity ◽  
Core Sample ◽  
Effective Pressure ◽  
Value Change ◽  
Gas Reservoir ◽  
Reservoir Rocks ◽  
The Impact ◽  
Made In

According to many researches, the presence of stress-sensitivity has been confirmed in reservoir rocks. Because it will create huge damage to the permeability of reservoirs, sufficient attention should be made. In this paper, through the experiment, the permeability value change with effective pressure in the condition of saturated with irreducible water and dry environment were compared. The study showed that the stress-sensitivity of core sample was more obvious in the condition of saturated with irreducible water.

The Hydrostatic Pressure Effect on Elastic Properties of B2-Phase Single Crystals Ti50Ni48Fe2and Ti50Ni45Fe5Alloys

1995 ◽  
Vol 05 (C8) ◽  
pp. C8-729-C8-734
Author(s):  
A.I. Lotkov ◽  
V.P. Lapshin ◽  
V.A. Goncharova ◽  
H.V Chernysheva ◽  
V.N. Grishkov ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
Single Crystals ◽  
Elastic Properties ◽  
Pressure Effect ◽  
B2 Phase

PRESSURE EFFECT ON THE CURIE TEMPERATURE OF Gd1-xYxCo2

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-275-C8-276
Author(s):  
H. Yoshida ◽  
T. Komatsu ◽  
T. Kaneko ◽  
S. Abe ◽  
K. Kamigaki
Keyword(s):  
Curie Temperature ◽  
Pressure Effect

PRESSURE EFFECT ON CURIE TEMPERATURE FOR (FeNi)90 Zr10 AMORPHOUS ALLOYS

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-1281-C8-1282
Author(s):  
H. Tange ◽  
Y. Tanaka ◽  
K. Shirakawa
Keyword(s):  
Curie Temperature ◽  
Amorphous Alloys ◽  
Pressure Effect

The methodological approach for the determination of the pressure of artificial raindrops as a question of the theory of splash soil erosion

2020 ◽  
pp. 24-28
Author(s):  
Mihail Zver'kov
Keyword(s):  
Block Diagram ◽  
Methodological Approach ◽  
Control Measures ◽  
Soil Conditions ◽  
Effective Pressure ◽  
Long Distance ◽  
Splash Erosion ◽  
Rain Drops ◽  
Artificial Rain ◽  
The Impact

To the article the results of the theoretical and experimental researches are given on questions of estimates of the dynamic rate effect of raindrop impact on soil. The aim of this work was to analyze the current methods to determine the rate of artificial rain pressure on the soil for the assessment of splash erosion. There are the developed author’s method for calculation the pressure of artificial rain on the soil and the assessment of splash erosion. The study aims to the justification of evaluation methods and the obtaining of quantitative characteristics, prevention and elimination of accelerated (anthropogenic) erosion, the creation and the realization of the required erosion control measures. The paper considers the question of determining the pressure of artificial rain on the soil. At the moment of raindrops impact, there is the tension in the soil, which is called vertical effective pressure. It is noted that the impact of rain drops in the soil there are stresses called vertical effective pressure. The equation for calculation of vertical effective pressure is proposed in this study using the known spectrum of raindrops. Effective pressure was 1.4 Pa for the artificial rain by sprinkler machine «Fregat» and 5.9 Pa for long distance sprinkler DD-30. The article deals with a block diagram of the sequence for determining the effective pressure of rain drops on the soil. This diagram was created by the author’s method of calculation of the effective pressure of rain drops on the soil. The need for an integrated approach to the description of the artificial rain impact on the soil is noted. Various parameters characterizing drop erosion are considered. There are data about the mass of splashed soil in the irrigation of various irrigation machinery and installations. For example, the rate (mass) of splashed soil was 0.28…0.78 t/ha under irrigation sprinkler apparatus RACO 4260–55/701C in the conditions of the Ryazan region. The method allows examining the environmental impact of sprinkler techniques for analyzes of the pressure, caused by raindrops, on the soil. It can also be useful in determining the irrigation rate before the runoff for different types of sprinkler equipment and soil conditions.

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