... ABSTRACT: A crucial aspect of rock engineering design for deep mining projects is comprehending the in-situ stress field. This is particularly true for panel cave mining, where the excavation and support design of the extraction level tunnels and pillars must account for an initial stress...

... subdiscipline hardness brine hydraulic fracturing reaction co 2 loading investigation engineering transition noshadravan orientation unraveling co-driven mechanical metamorphosis reservoir characterization brittleness variation fracture characteristic alteration interaction abedi initiation...

.... Example cases show that crack initiation strongly depends on HF length, NF angle, coefficient of friction and stress anisotropy. Crack initiation occurs only when HF reaches a sufficient length since the shear-slip zone length is proportional to HF length, which in turn affects K 1 at the crack tip. 1...

... the evolution of the blasting damage zone and the pre-blast area exhibits cyclic cumulative damage. 1. INTRODUCTION Blasting in rock masses holds significant importance for engineering construction. In the past time, researchers have concentrated on the entire process of rock damage (initiation, propagation...

... was then simulated using a Distinct Element Method (DEM) code through Trigon logic to further compare the brittle failure characteristics with the experimental results. The collective results revealed that the tensile microcracks are the first to initiate during the failure with higher intensity compared to shear...

... ABSTRACT: Rock mechanics researchers have defined crack initiation (CI) and crack damage (CD) thresholds as the points at which microcracks begin to propagate and coalesce under increasing stress levels. CI and CD correspond to cracking events and can be identified using Acoustic Emissions (AE...

... rock-like specimens with an initial flaw with various inclined angles (α = 30°, 45°, 60°) using the high-resolution Micro-CT scanner with a loading apparatus. Based on the CT images of 3D-printed rock-like specimens obtained at different scanning steps, the 3D reconstruction and digital volume...

... by active monitoring were more pronounced than in MN-HF. This study emphasizes HF initiation and propagation processes associated with MN-HF and CP-HF stimulation schemes, providing valuable insights for more accurate characterization of the stimulation operation. 1. INTRODUCTION Adopting multi-stage HF...

... ABSTRACT: Predicting near-wellbore hydraulic fracture (HF) orientation is crucial for designing stimulation treatments. This work proposes a physics-based approach to determine the orientation of HF initiation considering formation breakdown pressure (FBP) and key geomechanical parameters...

..., hydrogen and CO 2 storage, and geologic hydrogen production. To unlock the full potential of these applications, it is important to fundamentally understand the fracture initiation, propagation, coalescence and resulting permeability alteration processes and be able to model them at different scales...

... in both directions for potential hydraulic fracturing initiation (longitudinal and transverse) due to cooldown. Such stress alteration is largely dependent on the duration of cooldown. Furthermore, the thermally induced stresses diminish with the increased waiting (warmup) time before hydraulic fracturing...

... states government hydraulic fracturing compression principal stress geological subdiscipline diederich excavation bbm model upstream oil & gas wellbore design reservoir geomechanics strength brittle rock initiation tunnel rock mechanic confinement crack growth stiffness envelope...

... Pressure (LOP). It is sometimes argued that the LOP is a good measure of the in-situ stress, and it is sometimes argued the LOP marks the initiation of a fracture. We analyze this hypothesis and show by basic theoretical considerations and several examples of high quality field data...

... of multi-cluster fractures in the Lucagou shale reservoir and use the acoustic emission (AE) to monitor the dynamic process of hydraulic fracturing. The results show that the fracture interference starts from the initiation stage and is seriously affected by the bedding structure. The fracture interference...

... in nature. 1. INTRODUCTION Landslide phenomena usually involve the movements of a mixture of rock, earth and/or debris downslope (Cruden, 1991), which tend to develop over time through several different stages, from initiation to propagation and to final deposition (Leroueil, 2001). A landslide may...

... fracture reservoir characterization upstream oil & gas sensor mechanism well intervention experiment evolution geophysical signature permeation borehole hydraulic fracturing monitoring engineering propagation boundary stimulation operation initiation production enhancement...

... is proportional to the area of wave shape and does not depend on the selection of threshold value. When analyzing the physical simulation results of rock acidification fracturing, the large fluctuation of acoustic emission signal intensity indicates fracture initiation or communication fractures: the strong...

... ABSTRACT: In unconventional reservoirs, the initiation and propagation of multiple fractures are strongly influenced by the type of completion (number and type of initiation points). We conducted two hydraulic fracturing experiments in a laboratory setting on two blocks with different...

... ABSTRACT: During loss of control situations, fracture initiation occurring during the capping stages after uncontrolled fluid discharge, can lead to reservoir fluids broaching to the sea floor. A classic example is Union Oil’s 1969 oil spill in Santa Barbara channel, whose impacts...

... initiate and propagate, and the path for hydrocarbon transportation from the targeted formation to the wellbore, they have major influences on production rate. Near wellbore problems such as T-shaped fractures, multiple parallel fractures, sand production, tortuosity, and reoriented fractures have been...