... dominating and a few tensile radial fractures. Influenced by the stress difference, the fracture range in the direction σ H is larger than that in the direction σ h , forming an approximate elliptic cylinder deflagration fracture zone. The effects of rock elastic modulus, Poisson's ratio, peak pressure...

... rock (HDR) in field scale. The influences of stress disturbance, fracture initiation and propagation and three key parameters on fracture morphology are analyzed. The research results show that CSF can indeed generate complex fracture network under parameter optimization of peak pressure and loading...

.... The research aimed to investigate the dynamic load on the geotextile bag of fine-grained tailings consolidation drainage characteristics. The results showed that the peak pressure of the loaded air bag has the greatest impact on the degree of tailings consolidation drainage rate. The loading method of variable...

...), Banadaki et al. (Banadaki, 2010), Zhang et al. (Zhang et al., 2017), and Jeong et al. (Jeong et al., 2020)). Explosives generate loading pulses with a maximum peak pressure that can exceed 1 GPa and a rise time of the pressure waveform on the order of 1 to 2 microseconds. Experiences using explosives...

... ABSTRACT: Underwater rock blasting is an important branch of engineering blasting. Compared with the land blasting, the pressure duration of the shock wave of underwater blasting is longer and the peak pressure is higher, which makes more damage to rock. In this paper, a model of explosive...

... borehole complex reservoir particle dem-continuum mechanics modeling radial fracture base case peak pressure petroleum engineer symposium mechanics association reservoir characterization upstream oil & gas rise time specimen tensile strength fragment bond break fracture ARMA-21-1119...

... initiation pressure. The model described in this paper challenges these assumptions by considering a fluid lag at the tip of the hydraulic fracture growing from the pre-existing notches and by incorporating the hydraulic compliance of the injection system. This model indicates that the peak pressure...

... peak pressure fracture particulate material Upstream Oil & Gas fracture initiation particulate media fracture geometry Artificial Intelligence fracture tip block sample Symposium propagation Germanovich ARMA 19 1760 Laboratory Study of Hydraulic Fracturing Behavior of Weakly...

... are obtained from the discretized governing equations. These results show that the borehole pressure continues to increase after fracture initiation to eventually drop off. According to this model, the peak pressure does not correspond to a breakdown of the formation, but rather to a transition between two...

... reservoir and repeat treatment of old oilfield. In this paper, the influence of hydraulic pulse on hydraulic fracture is studied by a large scale of true triaxial physical simulation test. Test conditions of four experiments focus on the influence of peak pressure and pulse times on hydraulic fractures...

... formula initial pressure peak pressure perforation unknown function penetration length interface penetration Upstream Oil & Gas projectile-target interface penetration depth numerical simulation result single charge Wellbore Fluid ARMA 18 344 A Model for Estimating Penetration Length...

...) develops prior to peak pressure. Another important issue in the problem of borehole expansion is the discrepancy between theoretical predictions and lab/field measurements regarding a size (and rate) effect. Many previous studies demonstrate that a rate effect strongly exists and that the faster...

... to continuum damage mechanics (Rossmanith 1983 and Shah 1984) have been applied. Again, only limited success has been achieved. hydraulic fracturing Upstream Oil & Gas fracture mechanics geological material calculation fracture toughness crack growth crack density parameter peak pressure...

... tests have demonstrated the device's ability to generate peak pressures and pressure rise times in a confined hole similar to those associated with a deflagrating explosive, although the pressure decay curve is more rapid. Laboratory tests have shown that the tool is capable of fragmenting unconfined...

... that fracturing behavior is considerably more complex in liquid- filled boreholes than in the liquid-free case. Compared to liquid-free boreholes, liquid-filled boreholes have faster pressure risetimes and lower peak pressures, large hydraulic-type fractures propagating several meters beyond the end of the test...

... Tunnel bulkhead upper power tunnel peak pressure final round shaft probe hole lake tap air cushion Tyee Lake Tap water flow rock engineering expansion tunnel valve Chapter104 ROCK ENGINEERING FOR TYEE LAKE TAP by John Cogan and Frederick C. Kintzer International Engineering Company,Inc...

... is the key variable governing fracture behavior. The peak pressure attained is of secondary importance and appears to be a function of in situ stress and loading rate. The fracture geometry is governed by the in situ stresses and pressure risetimes. The major fractures occur along the principal planes...

... and that the breakdown pressure corresponds to the initiation phenomenon only under very restricted conditions. The Body Force Technique may allow for better interpretation of stress measurement data and pumping test data. INTRODUCTION Breakdown pressure is commonly defined as the peak pressure attained when fluid...

... tuff formation and mineback of the experiments provided direct observational evidence to characterize the results. Phenomenologically different behavior was observed. The slowest propellant (burn time = 0.9 sec) had a pressure loading rate (0.09 psi/µsec) and a peak pressure (6250 psi) that were...

... data ononegraph. After the initial tests the measuringtechniquewas adoptedas an aid in many researchproblems. Typical resultsare shownin Table I. As shown,the additionof 10-20 pct aluminumhas very little effecton peak pressure in dynamite or water gels. This technique has also proven valuableto...