...1. INTRODUCTION Wellbore stability analysis has been the subject of study and discussion for a long time. The integrity of the wellbore plays an important role in many well operations during drilling, completion, and production. Problems involving wellbore stability occur principally through...

...1. INTRODUCTION It has been demonstrated that thermal effects can be very important to both wellbore stability and injection design (Guenot and Santarelli, 1989 [1]; Paige and Murray, 1994 [2]; Charlez, 1997 [3 Formation temperature and formation pore pressure are fully-coupled for fluid flow...

... 1. INTRODUCTION Literature Review. Before presenting the proposed model, the authors would like to focus on the previous models which have been studied mainly in recent years, with concentration on well-bore stability in shaly formations. Our proposed model will also be explained in more detail...

... for hole stability analysis are incapable of accurately predicting the volume of failed rock. Rather these methods predict the onset of rock failure and thus the completion design errs on the side of safety. This paper summarizes an R&D study that arose from a challenge by one of Norsk Hydro s Offshore...

... reservoir geomechanics external stress specimen concentration experiment elliptical breakout Upstream Oil & Gas hole failure higher external stress stability breakout depth Reservoir Characterization circular hole sandstone hollow cylinder geometry breakout breakout tip...

... Abstract: Slope stability designs are largely dependent on rock mass and more specifically discontinuity characterization. Traditional discontinuity characterization methods (scanline and cell mapping) have many problems associated with time, safety, accuracy, and human bias. This study shows...

... Artificial Intelligence reservoir depletion assumption Reservoir Characterization depletion Upstream Oil & Gas reservoir geomechanics pore pressure stability boundary perturbation reservoir boundary reverse fault fault inclination fault stability reservoir instability fault...

...1. INTRODUCTION The stability of wedges formed around underground excavations in blocky rock masses is a common problem in rock engineering. The wedges are formed by intersecting discontinuities and the free face created through excavation of an underground opening. Under the influence of gravity...

... dominant ground or in situations where the ground has been previously damaged by high stress. Such relaxation is often neglected in limit equilibrium calculations and in empirical design techniques. The stability of hanging walls in open stopes is of particular concern with respect to the detrimental...

... data. The rock mass strength for fresh and hydrothermally altered rock was calculated for lava flow, dome and pyroclastic litholigies. Volcano modeling utilizing the distinct element method (UDEC) and the limit equilibrium technique, was used to assess stability and deformation of the edifice. Modeling...

... Institute, The University o/Oklahoma, Norman, Okla., USA (On leave/rom the Lebanese American University, Byblos, Lebanon) ABSTRACT: Stress and pore pressure variations due to the introduction of multilaterals from a main well bore are analyzed herein. Wellbore stability for multilateral junctions...

... ABSTRACT ABSTRACT: Stability of some rock slopes is often influenced by heavy rain during summer in Korea. One of the main process involved in this, is the slaking of highly weathered rock. Such change of engineering behavior due to slaking can not be easily detected by the measurement...

... stability pore pressure shale stability pressure difference pore pressure change fluid pressure van Oort permeability Pore Fluid interaction surface area test fluid membrane efficiency Pacific Rocks 2000, Girard, Liebman, Breeds & Doe (eds) © 2000 Balkema, Rotterdam, ISBN 90 5809 1554 Pore...

... inactive rock quarries are deep, abandoned, water-filled pits with near-vertical walls. Reclaiming a quarry site or investigating a quarry bottom may require draining the quarry. However, rapid drawdown of the quarry water level may reduce the stability of the quarry walls to their lowest level ever...

... ABSTRACT ABSTRACT: A computer analysis of bench stability has been developed to account for multiple occurrences of potential slope-failure modes in discontinuous rock masses. Bench-scale plane shears and tetrahedral wedges are simulated and stochastically analyzed to estimate the probability...

... guide in the construction of the tunnels in heavily fractured rock mass. Upstream Oil & Gas tunnel support excavation support system numerical analysis stability tunnel roof steel pipe Reservoir Characterization shallow tunnel mechanical property Invert injection material...

... potential equation shale instability stress distribution University coefficient interaction drilling fluid property Upstream Oil & Gas borehole stability diffusion Ghassemi Pacific Rocks 2000, Girard, Liebman, Breeds & Doe (eds) © 2000 Balkema, Rotterdam, ISBN 90 5809 1554 Effects...

... ABSTRACT ABSTRACT: The empirical scaled span approach for assessing surface crown pillar stability has been in use for over a decade. In this time it has been widely applied for dimensioning new pillars and for assessing the stability of old, often abandoned crowns. Based on updated knowledge...

...Pacific Rocks 2000, Girard, Liebman, Breeds & Doe (eds) © 2000 Balkema, Rotterdam, ISBN 905809 1554 Evaluation of the stability of fill in longhole mining S.J.Jung University of Idaho, Moscow, Idaho, USA S.M.Lee Youngdong University, Korea H.U.Lim Kangwon National University, Korea ABSTRACT...

... that was previously mined using a variety of underground mining methods, Therefore, the bottom 350-ft of the 800-ft highwalls was expected to be founded in remnant stope backfill and caved rock. metals & mining calibration prediction data mining version 3 stability excavation mining expansion...