... for the Personal The Figure 3 shows that the orientation and length of the Access Tunnel (TAP P4600). fractures will depend considerably on the stress conditions of the sector. Moreover, fractures tend to line 2. CONCEPT OF DESTRESS BLASTING up with the direction of the major principal stress. Saharan...

... directions on the entire micro- Where P is the stress, E* is the combined Young's fracture system to prevent displacement on the X- Axis and Z-Axis under normal stress conditions; modulus, ' is the Poisson's ratio of proppant, and E is the lower boundary of the micro-fracture is fixed, and the upper...

... for ellipse pore under various stress conditions. Based on were prepared in order to analyze correlation between porosity definition and relationship between porosity and factors and permeability, and build permeability model. permeability, permeability model for ellipse pore was Those permeability data were...

... coupled simulation of 3D geomechanics with it. This will accommodate the gradual stress model and dynamic model to estimate present-day propagation from the major tectonic stress to overburden stress condition (4D geomechanics model). and reservoir zone of the study area. For underburden zone, the depth...

... experiment log analysis carbonate reservoir sensitivity reservoir characterization complex reservoir pre-test porosity porosity plug microporous sample cycling macroporous sample mpa carbonate rock acoustic property stress condition pore type meso-and macroporous sample isotropic loading...

... the importance of considering the initial state of stress. We also present a work flow in Abaqus that allows for modelling the expected initial stress condition in a cemented wellbore. cement property casing and cementing casing-cement-rock system coefficient reservoir geomechanics Upstream Oil...

... ABSTRACT: In this paper we have studied the effects on fracture initiation and propagation by precooling the borehole region, using our recently developed novel true triaxial apparatus, giving us the capability of recreating fully anisotropic stress conditions with a semi-circular sample...

... sensitivity Reservoir Characterization tight gas unconventional tight gas sand reservoir sonic velocity log analysis structural geology plug sample core measurement wireline log continuous profile p-wave velocity wireline sonic tool geomechanical property stress condition sonic tool elastic...

... was investigated. It demonstrated that coal strength with adsorbing gas injection had a positive correlation with confining stress; coal specimen showed plasticization under a higher confining stress condition; anthracite coal has a strong adsorption effect on CO2 and the free gas phase CO2 adsorption can cause...

... in the ultimate economic recovery. From a subsurface perspective, the design of hydraulic fracturing treatments requires developed understanding of several key steps, including (i) characterizing the geology and rock mass properties, (ii) estimating the orientation and magnitudes of the in-situ stress conditions...

.... The abstract must contain conspicuous acknowledgement of where and by whom the paper was presented. ABSTRACT: A laboratory hydraulic fracture experiment was conducted on a Montney shale specimen under the conventional triaxial compressional stress condition. Acoustic emissions (AEs) were recorded using 7...

... conditions. However, there are two key limitations of this method. The diameter and length of a cylindrical sample are generally not equal, which brings heterogeneity due to the sample size. Besides, the triaxial stress conditions ( 1 > 2 = 3) are inconsistent with the anisotropic true triaxial stresses...

... and the effect of water breakthrough and gas flow in gas reservoirs. However, most of sand production models in the literature have been experimentally validated under isotropic stress conditions and subsequently applied to anisotropic states as well. This extrapolation may not be directly valid. Moreover, sand...

... Upstream Oil & Gas depletion constant triaxial effective stress boundary condition stress path variation experiment effective stress stress condition harpalani coefficient uniaxial strain condition helium horizontal direction strain condition 1. INTRODUCTION AND BACKGROUND Predicting...

... ABSTRACT: Unconsolidated sand was packed on a slotted-liner coupon in large-scale sand retention tests (SRT) and was subjected to several stress conditions, corresponding to the evolving stress conditions during the life cycle of a SAGD producer. Cumulative produced sand at the end of testing...

... and rock mass failure criteria which can be fed back into the static stress model to improve it. In this paper we apply these techniques at Barrick Williams Mine in Canada to an area of the mine where the assumed in situ stress conditions did not match underground observations (damage of boreholes...

... on the formation capacity and stress conditions to avoid high pore pressure buildup that may lead fault shear reactivation or open-mode fractures. Characterizing the evolution of the state of stress upon CO2 injection is a complex problem that includes thermo-elastic and poro- elastic coupled processes (Espinoza...

... in the processes of CBM production. Considering the fracture aperture, roughness and density, coal fracture networks are reconstructed on the basis of the Voronoi tessellations. Based on the rock elastic theory, the stress-strain model of reconstructed coal fracture networks under stress condition is established...

... Characterization displacement sh model creep constitutive model stress condition power law creep rate underground excavation mechanics strain rate inelastic strain rate 1. INTRODUCTION Polycrystalline halite, the mineral of rock salt, presents unique mechanical features from the response to natural...

... scenarios of in-situ stress conditions are considered. Excavations with and without support elements were also considered. The supports were shotcrete with steel fibers, reinforcement cables and a mixture of the two. Two-dimensional numerical analyses of the stability of the excavation were carried out...