... ABSTRACT: Understanding the spatial variation in intact and defected rock strength is critical to geomechanical mine design. At the Newcrest Cadia East mine, systematic point load testing (PLT) was used to measure the strength of intact rock and individual defects (e.g., veins) at regular...

... control unstable perforation esf drawdown pressure condition produce sand-free sanding evaluation perforation well planning wellbore design fluid dynamics depletion rock strength load factor stress regime ARMA 21 1882 Analytical Sand Production Prediction and Sand Volume Estimation...

... geomechanical characterization sedimentary texture sandstone porosity Taranaki Basin reservoir rock thrasher University rock strength lithofacies permeability grain size distribution geology 1. INTRODUCTION Around the world, extensive work has been undertaken to understand the geomechanical...

... block strength Reservoir Characterization Engineering rock mass strength veined rock mass rock mass bewick tensile strength metals & mining strength rock strength jointed rock mass rock mass condition 1. INTRODUCTION Recent experience in copper porphyry rock masses at depths below...

... between basement component rocks. Fluid-weakening in deformation tests indicates chemo-mechanical processes may also contribute to subsurface deformation in Oklahoma. Upstream Oil & Gas wave velocity reservoir geomechanics Reservoir Characterization rock strength strength Westerly granite...

... the loading- rate dependence of rock strength, which has close relation to the other time-dependent behaviors such as creep and relaxation. Test duration for the loading-rate dependence of strength is much shorter than that for creep or relaxation; however, many rock specimens were required for the loading...

... reduce rock strength mainly by 1) extension of preexisting cracks or formation of new microcracks attributed to the thermal expansion of minerals (Ferrero and Marini, 2001; Shushakova, 2013). Notably, quartz phase transition at 573°C increases the differential expansion between quartz and other...

... specimens were then simulated in FLAC. The results indicate that spatial correlation is a key factor that influences both the rock strength and the failure modes. The strength predicted by the model with stochastic approach with spatial correlation is larger than the model with completely random properties...

... of the following aspects: (i) sample preparation, (ii) destructivity, (iii) repeatability, (iv) resolution, (v) natural bias, (vi) sensitivity to sample size and, (vii) lithology dependence of the correlation between test results and rock strength. Discussions of these points are illustrated with examples from...

... results suggests an underestimation of the dynamic rock strength; the effect of axial and circumferential inertia of the specimen didn’t manifest the strength value consistent with the physical observation. Therefore, a parameter called rock strength enhancement coefficient was introduced which increases...

... pillar strength equation. metals & mining esterhuizen rock strength pillar collapse Upstream Oil & Gas Iannacchione mountain structural geology strength discontinuity through-going discontinuity southwestern pennsylvania limestone pillar rock mass classification Reservoir...

... system Directional Drilling geomechanical model prediction horizontal stress Muderong Shale muderong formation Windalia shale pyrenee development area mud weight rock strength laboratory measurement lateral well ppg friction angle drilling campaign breakout 1. INTRODUCTION...

... ABSTRACT: Current analytical methods to assess rock strength for borehole stability, stimulated volume calculations and fracture and faulting almost exclusively involve the use of the Mohr-Coulomb failure criteria, which does not account for the effect of the intermediate principal stress...

... increases with distance from faults, similar to rock mass quality. reservoir geomechanics specific energy drilling operation concentration metals & mining median rock strength drill hole Reservoir Characterization Upstream Oil & Gas drilling depth frequency distribution specific...

... into account by varying the material strength of the elements within the high strength zone and the fracture attributes within this zone. Results have shown that both the high rock strength of coal lithotype and low fracture intensity within this zone contribute to the decrease in seismic event counts...

... is an expensive and time consuming process. It would be ideal if the strength of the intact rock could be estimated in the field as an in-situ measurement by running a device inside a borehole. Estimation of the rock strength by scratch tests has been reasonably accurate. Application of this concept...

... scratch test standoff distance rock strength high temperature Drilling sample surface rock material 1. INTRODUCTION The exploitation of hydrocarbons and deep geothermal resources relies on finding cost-effective solutions to increase the drilling performance in hard crystalline rocks (Gill, 1983...

... ABSTRACT: During excavation of rock tunnels or construction of underground openings, estimating and determining the intact rock strength is of vital importance. Theoretical and practical methods for estimating intact rock strength were developed during past rock engineering practices...

... brittleness Cerchar abrasivity index neural network abrasiveness rock abrasiveness application neuron rock strength cerchar abrasion index Brazilian tensile strength uniaxial compressive strength rock sample tensile strength 1. INTRODUCTION In this research, artificial neural networks (ANN...

.... In this paper we review some of the main sources of uncertainty pertaining to standard core analysis workflows relying on sparse measurements obtained from the testing of plug samples and describe how continuous high resolution profiles of properties such as rock strength and ultrasonic velocity profiles...