scholarly journals Study of pore pressure variation during liquefaction using two constitutive models for sand

2007 ◽  
Vol 27 (1) ◽  
pp. 60-72 ◽  
Author(s):  
Mahdi Taiebat ◽  
Hadi Shahir ◽  
Ali Pak
Keyword(s):  
Pore Pressure ◽  
Constitutive Models ◽  
Pressure Variation

Wellbore Integrity: An Integrated Experimental and Numerical Study to Investigate Pore Pressure Variation during Cement Hardening under Downhole Conditions

SPE Journal ◽  
2021 ◽  
pp. 1-16
Author(s):  
Weicheng Zhang ◽  
Andreas Eckert ◽  
Steven Hilgedick ◽  
Harvey Goodman ◽  
Meng Meng
Keyword(s):  
Pore Pressure ◽  
Numerical Study ◽  
Pressure Variation ◽  
The State ◽  
Numerical Results ◽  
Von Mises Stress ◽  
Fluid Loss ◽  
Wellbore Integrity ◽  
State Of Stress ◽  
Pressure Decrease

Summary Understanding the cement hardening process and determining the development of the state of stress in the cement under specific downhole conditions are challenging but fundamental requirements to perform an accurate prediction of wellbore integrity. As an essential component of the state of stress, the temporal variation of cement pore pressure is a critical factor that affects the occurrence of cement failure. In this study, we present a novel laboratory setup to measure the cement pore pressure variation during hardening under representative downhole conditions, including the pressure, temperature, and water exchange between the cement and formation. The pore pressure measurements are further incorporated with a staged finite element analysis (FEA) approach to investigate the state of stress development during cement hardening and to evaluate cement failure under different operations and after different wait-on-cement (WOC) periods. The laboratory measurements show that the external water supply from the formation significantly impedes the pore pressure drop in the cement. The numerical results indicate that the accelerated pore pressure decrease obtained without considering downhole conditions elevates the contact pressure at the cement-formation interfaces significantly and moderately increases the von Mises stress in the cement. The numerical results further predict that the accelerated pore pressure decrease leads to an overestimation of shear failure during pressure testing and steamflooding operations but an underestimation of debonding failure during severe fluid loss and injection-related cooling processes. Based on the results of the integrated laboratory and numerical approach, qualitative and quantitative suggestions are provided for field operations to inhibit wellbore integrity risk during the wellbore life cycle.

scholarly journals Pore pressure variation at constant confining stress on water–oil and silica nanofluid–oil relative permeability

2018 ◽  
Vol 9 (3) ◽  
pp. 2065-2079 ◽  
Author(s):  
Caspar Daniel Adenutsi ◽  
Zhiping Li ◽  
Fengpeng Lai ◽  
Anthony Edem Hama ◽  
Wilberforce Nkrumah Aggrey
Keyword(s):  
Pore Pressure ◽  
Relative Permeability ◽  
Pressure Variation ◽  
Confining Stress

Resistivity survey results related to the measurement of pore pressure variation in sea dyke

2011 ◽  
Author(s):  
Sung-Ho Song ◽  
Gyu-Sang Lee ◽  
Jin-Sung Kim ◽  
Jong-Hak Choi ◽  
In-Ky Cho
Keyword(s):  
Pore Pressure ◽  
Pressure Variation ◽  
Resistivity Survey ◽  
Survey Results

Effect of Pore Pressure Variation on Borehole Stability of Drilling in Sandstone Reservoir

2012 ◽  
Vol 577 ◽  
pp. 163-166
Author(s):  
Yu Wei Li ◽  
Jia Liu ◽  
Chao Yang Hu ◽  
Shuang Li ◽  
Yu Liu
Keyword(s):  
Pore Pressure ◽  
Effective Stress ◽  
Drilling Fluid ◽  
Calculation Model ◽  
Pressure Variation ◽  
Stress Factor ◽  
Borehole Stability ◽  
Porosity Variation ◽  
Sandstone Reservoir ◽  
Variation Model

Considering pore pressure variation of sidewall rock, which is caused by drilling fluid filtering, the porosity variation model of sidewall rock in sandstone reservoir and effective stress factor variation model are established, and according to relationship between pore pressure and total volume strain of sandstone, the calculation model of safe window of drilling fluid density on sandstone reservoir, with which considered variation of porosity and effective stress factor are finally established. Applying the calculation of this model shows that: with increased function of drilling fluid filtering, which is as increased as pore pressure of sidewall rock, caving pressure that ensures well hole stability is increased, fracturing pressure is decreased, safe window of drilling fluid is narrowing, and that is against of safety drilling.

Analysis of Space Shuttle External Tank Spray-On Foam Insulation With Internal Pore Pressure

2008 ◽  
Vol 130 (4) ◽  
Author(s):  
Brett A. Bednarcyk ◽  
Jacob Aboudi ◽  
Steven M. Arnold ◽  
Roy M. Sullivan
Keyword(s):  
Pore Pressure ◽  
Polymer Material ◽  
Space Shuttle ◽  
Micromechanical Model ◽  
Constitutive Models ◽  
Ideal Gas ◽  
Material Creep ◽  
Parametric Studies ◽  
Gas Expansion ◽  
Internal Pore

The polymer spray-on foam insulation used on NASA’s Space Shuttle external fuel tank is analyzed via the high-fidelity generalized method of cells micromechanical model. This model has been enhanced to include internal pore pressure, which is applied as a boundary condition on the internal faces of the foam pores. The pore pressure arises due to both ideal gas expansion during a temperature change as well as outgassing of species from the foam polymer material. Material creep and elastic stiffening are also incorporated via appropriate constitutive models. Due to the lack of reliable properties for the in situ foam polymer material, these parameters are backed out from foam thermomechanical test data. Parametric studies of the effects of key variables (both property-related and microstructural) are presented as is a comparison of model predictions for the thermal expansion behavior of the foam with experimental data.

scholarly journals TURBULENT BORES-INDUCED SCOUR AND PORE PRESSURE VARIATION AROUND A VERTICAL STRUCTURE

2020 ◽  
pp. 29
Author(s):  
Marieh Rajaie ◽  
Amir H. Azimi ◽  
Ioan Nistor ◽  
Colin D. Rennie
Keyword(s):  
Pore Pressure ◽  
Vertical Structure ◽  
Pressure Variation ◽  
Comprehensive Model ◽  
Hydrodynamic Conditions ◽  
Coastal Structures ◽  
Tsunami Waves ◽  
The Past ◽  
Pressure Development ◽  
Bed Slope

Pore pressure and scour formation around coastal structures have been investigated in the past which led to a relationship between the hydrodynamics of tsunami waves and sediment erosion around coastal structures. With the objective of developing a comprehensive model to assess the interaction of hydrodynamic conditions, induced scour, soil pore pressure, and beach slopes, this novel study aims to examine (1) the effect of hydrodynamic forcing factors such as bore depth on scour and pore pressure generation on both horizontal and inclined bed conditions and (2) the effect of bed slope on the scour and pore pressure development and (3) the influence of the soil pore pressure on scour around a square shaped structure.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/dTQ-_GLhtzs

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