... in the principal stress space. Therefore, the polyaxial criterion can be defined as a simple relation between maximum and intermediate stresses. We propose to define such an empirical criterion as a second order polynomial which fits trends observed in polyaxial laboratory strength data. INTRODUCTION Knowledge...

... ABSTRACT In 4D Seismics, the dilation factor has become a very interesting rock property in recent years due to its simplicity in linearly relating rock deformation with acoustic velocity variation or time-lapse time shift. Its lab-scale characterization through coupled acoustic-mechanical...

... of packers and sleeves in relation to the reservoir formation strength and sandface flow contributions. The above sanding mechanism and practical ramifications are illustrated through historical sanding responses in 11 horizontal wells in an oil field in the UK North Sea. The reservoir formation...

... in Figure 1. (a) (b) (c) Fig. 1. Fault related issues in nature: (a) Creeping North Anadolu Fault (NAF) at smetpa a (Türkiye) , (b) grounwater inrush in Nakayama Tunnel (Japan) and (c) view of a collapsed semi-underground city in Çat (Türkiye). Many fundamental studies on fracture/shear zones have been...

... through this suggested method. The simple iterative procedure based on the least square method was suggested. While suggested method works best for inclined cores in determining five independent elastic constants, horizontally or vertically layered cores require the empirical relation to determine...

... pressure, pc, is the pressure difference between the deformation of solid matrix. The coupled wetting and non-wetting phases: deformation/diffusion process is described by theory of poroelasticity (Biot, 1941; Cheng, 2016). The basic = (4) constitutive equations relate the total stress to both...

... predictive estimation of fracture permeability after slip. The proposed relations link fracture length, shear displacement, fracture apertures, hydraulic apertures, and fracture permeability. We consider both fracture creation and the re-activation of existing fractures that have been infilled by minerals...

..., tensile strength, density, brittleness and Cerchar abrasivity index were carried out on a rock specimen. Then relations between measured intact rock properties and measured cutting force via LCM tests were examined. It is found that the intact rock properties could be employed to estimate cutting force...

... properties thus forms an applicable basis for medium characterization. We propose a method to characterize fracture apertures with their stress-dependent flow-elastic relations. The dependencies of various flow and elastic properties in single rough fracture hosting rock, on aperture distribution and normal...

...-specific constitutive equations relating strains to stresses for hydrostatic, uniaxial and triaxial tests and arrange these into a system of equations that are readily inverted for the full set of nonlinear elastic moduli. With measured static third-order elastic constants, geomechanical applications...

..., the creep rate is about 1.00×10-8s-1. Under the condition of axial loading 20MPa, the creep rate is about 5.28×10-9s-1. Under the condition of axial loading 15MPa, the creep rate is about 2.73×10- 9s-1. Fig.2 The experimental device for triaxial creep experiment Fig. 3: The relation between strain and time...

... of the fracture or conduits, the injectivity might exhibit two behaviors. For a rigid fracture, i.e., low fracture compliance, the relation between flow rate and pressure is typically linear (Fig. 1, top), as long as turbulence is absent that reduces the gain in flow rate per pressure increment. Then, injectivity...

... wellbore integrity is one of the key challenges. Changes in cement mineralogy and associated mechanical properties may critically affect the integrity of high temperature wells. In this study, the relation between changes in mineralogy and mechanical properties of API class G cement with 40% silica flour...

... in the oil-saturated sample, and even smaller in the brine-saturated sample. It was even smaller in the dry sample. It appears that in the liquid-saturated plugs, the AE level is monotonically related to the acoustic impedance of the pore fluid – the smaller the impedance the higher the AE. It does...

... ABSTRACT: It is well recognized that injecting CO 2 in methane-saturated coal seams can initially decrease the injectivity, followed by a permeability rebound as gas pressure increases. Studies showed that such permeability change is related to the adsorption-deformation coupling which...

... itself, but have little effect on those in the farther strata. Upstream Oil & Gas reservoir geomechanics Reservoir Characterization relation pore pressure finite fault network orientation heterogeneity Artificial Intelligence geometric model contact surface situ stress calculation...

... zones along the ridge and play a key factor behind the high stress conditions. US government stress deformation Reservoir Characterization relation aden area study area variation Upstream Oil & Gas temporal variation Earthquake seismic period spatial variation contribution...

... ABSTRACT: The mechanical behavior of Zhenping marble is studied using the lattice-spring-based synthetic rock mass (LS-SRM) modeling approach. Mechanical response of the rock is assessed using stress–strain relations under unconfined and confined compressions. ITASCA's SRMTools is used...

.... Reservoir Characterization production logging flow test production control equation of state relation flow rate specimen time-invariant flow rate transport-controlled dissolution injection flow rate effluent concentration fluid modeling production monitoring structural geology Einstein...

... ABSTRACT: Rock engineering applications require a more efficient and dependable approach to estimating mode-I fracture toughness (K IC ) than is currently available. Herein, we develop an empirical relation between mode-I fracture toughness and tensile strength according to data from...