... ABSTRACT: Strain amplitude, frequency, stress conditions, and fluid saturation influence the stiffness response of rocks. In order to quantify the effect of frequency and strain amplitude, we performed low-frequency measurements on fully saturated Bentheimer sandstone samples to measure...

... the cutting angle, the more complicated the relationship between the cutting force amplitude and the cutting depth, from linear relation to quadratic and cubic functions. Meanwhile, the mechanical specific energy for rock-breaking remains at a small level in a cutting angle range of 10 to 20 °. Compared...

... macropore nmr curve continental sedimentary tight reservoir comparison petrol amplitude guar gum mesopore residue agent experiment mineral ARMA 22 427 Damage Assessment of Fracturing Fluid in Continental Sedimentary Tight Reservoir Based on NMR Technology Runzi, Xu1, Shenglai Yang 2, Beidong...

..., the chamber pressure, the total normal load, the shear load and the slip displacement were monitored. During the tests, continuous pulses of P-and S-waves were transmitted through the specimen and the amplitudes of the transmitted and reflected waves were recorded. The paper provides results of the mechanical...

... amplitude zang ARMA 22 63 Microscale observations of hydraulic fractures in Gonghe granite subjected to low- and high-cycle fatigue experiments Zhuang, L. Korea Institute of Civil Engineering and Building Technology, Goyang, Gyeonggi, Republic of Korea Zang, A. Helmholtz Centre Potsdam GFZ German...

... the amplitude of the Lg surface waves and maximum horizontal amplitude measured by the seismograph, respectively. Moment magnitudes are inaccurate for small earthquakes (Magnitude < 3.5) and if the waveforms used in the moment tensor inversion are recorded in stations with inadequate azimuthal coverage...

... amplitude, frequency, roughness and viscosity affect hydraulic fracture initiation. 1. INTRODUCTION The success of unconventional reservoir development is the benefits of hydraulic fracturing and horizontal wells (Rong et al.,2004; Karacan et al., 2011; Dong et al., 2019; Nguyen et al., 2020; Wang et al...

... the travel time and the amplitude of the echo. The locations and sizes of breakouts can be obtained from interpretation of ATV data. Currently the process of breakout interpretation is conducted manually, with associated low procedural efficiency and high costs. As a means of avoiding these shortcomings, we...

... prediction model is proposed. The results show that when stick-slip occurs, the amplitude of triaxial acceleration vibration is larger, the power spectrum density is smaller than normal drilling, and there are apparent peaks. The triaxial acceleration is a stationary non-white noise sequence. The stick-slip...

... and installation parameters of vibration drag-reduction tools is established with drag reduction efficiency as the objective function and drill string fatigue failure and hydraulic energy loss as constraint conditions. Finally, the above theoretical model is applied to practice. The results show that the amplitude...

... propagation sandstone magnitude breakdown pressure fracture propagation plug fracture initiation amplitude lamination experiment fracture propagate ARMA 22 0545 Reducing Breakdown Pressure in Hydraulic Fracturing: A Novel Cyclic Injection Procedure Gang Han Aramco Americas, Houston, TX, USA Munir...

... stress load on coal samples with confining pressure and the crack propagation and coal damage are detected by CT scanning technology. The coal strain amplitude-time curve indicates that there is a critical value related to the cyclic stress parameters in the transformation from cyclic hardening...

... permeable reservoir vicinity discontinuous displacement deflection variation permeability fracture propagation reservoir geomechanics orientation reservoir depletion amplitude coefficient science foundation comparison ARMA 22 596 The comprehensive effects of group fracturing and depletion...

... strength rotary-percussive drilling drilling operation rock mechanic association engineering consideration reservoir geomechanics amplitude displacement rock mech min sci mechanism ARMA 22 874 Numerical analyses of the granite fragmentation in rotary-percussive drilling with the consideration...

... the dependence of stiffness on applied triaxial stress amplitude. Results show that for almost all tested rocks, Young’s modulus and Poisson’s ratio are dependent on stress change during triaxial loading/unloading well before reaching plastic yield. In order to study the factors influencing non-elastic processes...

... than the wellhead pressure. In contrast, the BHP of PHF is a pulse pressure with the same frequency as the input frequency when the input frequency is smaller than 10 Hz. Moreover, the amplitudes of BHPs for different input frequencies fluctuate with the input frequencies, and there are 17 pressure...

... constitutive model material parameter orientation reflection amplitude reservoir characterization mohr-coulomb constitutive model perpendicular plastic strain tensile strength fracture mohrt model tensile plastic strain mohr-coulomb model compressive stress constitutive model strain-softening...

... particle vibration waveform vibration dip angle three-component sensor upstream oil & gas mechanism characteristic amplitude hypocenter ARMA 21-1395 Application of three-component acoustic emission sensor in the uniaxial compression rock failure experiment Wu, Shan Southern University...

... are analyzed in the time domain and frequency domain, show that the erosion mechanisms of the abrasive jet are quite different. The acoustic wave of Si shale is featured by the low amplitude. On the contrary, the acoustic wave of C shale is a high amplitude. This study provides a fundamental theory...

...) The increase of the amplitude of cyclic variable fracturing load will increase the sliding speed and amount of natural fractures. This study provides a feasible method for controlling the reactivation of the natural fracture and the complexity of the hydraulic fracture through cyclic variable load fracturing...