... ABSTRACT: In order to evaluate the growth of fractures for cuttings re-injection, a solid transport model is included in a solidfluid coupled hydraulic fracturing simulator. The fracture geometry is a critical factor affecting the safety of the re-injection operation, and solid particle flow...

... ABSTRACT: This paper presents a three-dimensional, geometric-mechanical, hierarchical, stochastic model of natural rock fracture systems. In the model, fracture systems are generated through superposition of hierarchically related sets, created via stochastic methods that reflect inherent...

... is presented for calculating thermally induced stresses associated with cooling of a fracture in a geothermal reservoir. The procedure is then implemented in a computer program and is used to treat the problem of injection into an infinite fracture. The thermally induced stresses are calculated using actual...

... constitutive model rock mass UDEC numerical model fracture 1. INTRODUCTION The international community has been investigating the suitability of deep geological disposal facilities for nuclear waste since the early 1970 s. These investigations have mainly focused on issues related to geochemistry, geo...

..., stabilities of the borehole wall and pre-existing fractures will be at risks. In this paper, a mixed boundary element model (BEM) is developed to solve these problems within the framework of thermo-poroelasticity. The model is applied to borehole stability and fracture problems in high temperature subsurface...

... Abstract. Hydraulic fracturing is the most dominant method of in-situ stress measurement at great depths. It is based on the fundamental concept that the extension fluid pressure is relatively constant inside the hydraulic fracture and slightly greater than the least in-situ principal stress...

... ABSTRACT: This paper deals with the shear-induced dilatation mechanism when a plane-strain fluid-driven fracture propagates on a plane of weakness, subjected to shear and compressive stresses. The fracture surfaces are in contact and their sliding over each other gives rise to normal opening...

... ABSTRACT ABSTRACT: The paper presents a theory for determining the in-situ stress state from multiple fracturing data and induced fractures from image logs. A solution can be obtained with a minimum of three data sets. However, using an inversion technique, a solution can be o btained...

... ABSTRACT: Understanding and modeling near-surface hydraulic fracture growth is of interest because fracturing is being used to induce caving near mine openings and for remediation work at shallow environmental waste or spill sites. Thus motivated, near-surface hydraulic fracturing experiments...

... detonation trials. Blast effects and site conditions were observed seismically and photographically to provide detailed information concerning rock heave, surface fracturing, ejected fragment motion and support media survivability characteristics. The relative effectiveness of a wide range of area support...

... of energy that remains in the object after the collision is totally dependent on its deformation characteristics. Some energy loss as heat and sound from the impact, but the elastic properties and strength of the objects dictate the energy stored or lost in fracturing of the object. A parameter known...

... submatrices required for 3D DDA are derived. The extended 3D DDA is then applied to analyze the thermal-mechanical behavior of a block of fractured rock in an in situ thermal test known as the Large Block Test (LBT). The deformations of multi-point borehole extensometers (MPBXs) are calculated using 3D DDA...

... or fractures are present at the borehole wall. Reliance on these methods can limit the ability to evaluate borehole stability and determine the safe mud weight window to the geometry or geometries on which the model being used is based-a circular borehole. When breakouts or fractures have formed, a different...

... ABSTRACT: The Jackfork sandstone formation is widely distributed in the Ouachita Mountains in southeastern Oklahoma and southwestern Arkansas, USA. It has become of interest in recent years because substantial gas reserves have been found. As the formation is very tight, hydraulic fracturing...

... ABSTRACT: A comprehensive suite of geophysical logs was collected in the SAFOD Pilot Hole in Parkfield, CA. from a depth of 775 m to 2150 m in highly fractured Salinian granite. The Pilot Hole intersected numerous macroscopic fractures and faults with extremely varied orientations. Despite...

... system. Reservoir Characterization caprock Upstream Oil & Gas mechanism slip tendency operation fault plane reservoir geomechanics fault reactivation co 2 overburden shear stress fracture geomechanical analysis Magnitude integrity injection pressure change reactivation...

... ABSTRACT: NIOSH researchers have identified a pattern of fracture zone development that suggests an explanation for fracture formation around rectangular openings in underground mines. This pattern is characterized by shearing and dilation that result in either faults or in the repeated...

... ABSTRACT: In this paper, we describe a method to estimate, in real-time, the volume of a hydraulic fracture from tiltmeter measurements recorded during the treatment. The resolution of fracture dimensions and orientation is discussed at first. A limit, expressed in terms of the distance...

... ABSTRACT: Fluid flow and compressional wave propagation measurements were made on fractured samples prior to and after the chemical deposition of calcium carbonate. We observed that the initial void geometry (aperture and contact area) controlled the amount and spatial distribution of mineral...

... ABSTRACT: High temperatures and reactive fluids in sedimentary basins dictate that interplay and feedback between mechanical and geochemical processes could significantly influence evolving rock and fracture properties. In this paper, we propose an integrated methodology of fractured...