...) in-situ stress xx, yy, zz, xy, yz, zx (psi) leak-off coefficient cL (ft min) fracture toughness KIC (psi inch) Model of a Borehole numbers of holes any deviation angle x, y offset position ox, oy perforated section hf,upper , hf,lower (ft) Initial fracture (assumed to be elliptical) size...

... coefficient shear strength mechanics ABSTRACT: The mechanical properties of an earth material are related to it s dielectric permittivity, or the per-unit dimensional extent of which an electric charge distribution in a material can be polarized or distorted by the application of an electric field...

... reservoir geomechanics strength water saturation Upstream Oil & Gas pore pressure flow in porous media sand production particle capillary strength capillary force coefficient permeability proceedings water breakthrough chemical reaction Reservoir Characterization sandstone...

... = average joint length for set i, V = average joint block volume for set i, B = angle between joint plane and the direction of determination of E m for joint set i, and µ = coefficient of friction along joint planes in set i. The poisson's ratio of a jointed rock mass can be determined...

... used extensively in practice. The Coulomb friction law [1], states that, along the slip plane, the maximum shear strength is given by: = c + µ 'n (1) where c is the cohesion, 'n is the effective stress normal to the slip plane, and µ is the coefficient of friction, also expressed as µ = tan...

... fractions of the same fracture set. Power-law descriptions of fracture aperture populations take the form: F = ab -c, where F is cumulative fracture frequency, a is the coefficient, b is the fracture aperture, and c is the exponent of the power-law relationship. At any given aperture size, the intensity...

... through increasing both friction coefficient and cohesive strength. chemistry as well as time [4]. Previous studies [5,6,7] have suggested a number of mechanisms for which pore-size reduction has occurred as a result of diagenetic mineral growth and alteration. However, the role of the smectite-to-illite...

.... To improve the safety of the miner working near an ore pass, it is very important to understand the collisions that take place during the travel as the energy regime of the bulk of materials, especially near the chute gate assembly. 1. Coefficient of Restitution and Collisions The most fundamental question...

... Upstream Oil & Gas Biot OOIP reservoir geomechanics compressibility petroleum engineering constant value accurate biot coefficient reservoir type Reservoir Characterization Engineering calculation recovery factor estimation elastic parameter economic value reservoir rock...

... coefficient mass evolution permeability ventilation 1. INTRODUCTION The French Radioactive Waste Management Agency (ANDRA) has selected an argillaceous site in the east of France (Bure, Haute-Marne) as a potential nuclear waste storage host. An underground research laboratory at a 500 m depth...

... cylinder non-stationary boundary pressure equation coefficient stress path Boundary Pressure blowout 1. INTRODUCTION One of the dominating methods of oil and gas blowout control is bridging, or wellbore sealing with rock fragments from the collapsing formation [1, 2]. The majority of bridged...

... drilling fluids and materials drilling fluid formulation fluid interaction coefficient ionic diffusion coefficient unconventional resource economics back analysis Testing Methodology Rio de Janeiro wellbore integrity interaction reflectivity saline solution drilling fluid property oil shale...

... goes from isotropic stress conditions to anisotropic ones and that despite what is usually reported for this kind of porous materials, the Biot coefficient neither cannot be considered constant nor equal to 1. The results shows, indeed, that 0.8-0.9 are more realistic values and that for large...

... bit selection drilling operation bit design oscillation torque coupling RPM regime rotation bit-rock interaction law cleaning Upstream Oil & Gas correspond coefficient stick-slip vibration interaction stick-slip oscillation experiment torsional vibration vibration...

... implications of the static theory of linear poroelasticity for reservoir compaction are dis- cussed. First, the relationship between the bulk compressibility and the uniaxial compaction coefficient is re- viewed. Then, an expression is derived for the pore compressibility under uniaxial strain conditions...

... reservoir geomechanics radial ratio tensor Upstream Oil & Gas pore pressure Reservoir Characterization Fluid Dynamics porothermoelasticity porothermoelastic solution coordinate system transversely isotropic porous media thermic coefficient effective radial stress equation flow...

... E is the Yollng's modulus and lJ tlie Poisson's ratio. The flex- ural rigidity E'I is equal to E'h3 /12. The coefficient " 748 y p-~ -P Figure 3: Beam-Column of elastic clamping, will be determined by match- inner and outer asymptotics. The distribution of moment and shear force are given M E'I1 N...

... stochastic process fracture coefficient karhunen-loeve expansion Abousleiman solution process expansion random variable realization equation Pacific Rocks 2000, Girard, Liebman, Breeds & Doe (eds) 0 2000 Balkema, Rotterdam, ISBN 905809 155 4 A mechanistic approach to the management of uncertainty...

... a coefficient of lateral earth pressure. For a given state of regional stress, however, changes in valley form yield only small changes in the magnitude and distribution of the mean normal stress and maximum shear stress. Broad-floored valleys produce significantly different displacement and strain fields than...

... potential equation shale instability stress distribution University coefficient interaction drilling fluid property Upstream Oil & Gas borehole stability diffusion Ghassemi Pacific Rocks 2000, Girard, Liebman, Breeds & Doe (eds) © 2000 Balkema, Rotterdam, ISBN 90 5809 1554 Effects...