... of subsurface stresses with rock type and depth. For example, if we assume poroelastic coupling and anisotropic symmetry, quantifying the horizontal stress magnitudes with depth requires log-derived density, acoustic velocities, mineral composition, and pore-pressure properties as input, plus additional...

.... The volumetric stress and stress magnitude changes in different time steps in Figure 2 and Figure 3 show that the injection of cold CO2 induces thermal stresses due to the contraction of the cold area. (a) (b) (b) (c) Figure 2. (a) Volumetric stress from injection point after injecting 1.3 MT/yr of CO2 30oC...

... analysis orientation cubo geologist complex reservoir regime borehole overburden stress zoback diagram caliper log breakout vertical stress stress measurement well logging geological subdiscipline magnitude image log stress magnitude shmax pore pressure ARMA 23 890 Geomechanical...

... ABSTRACT: Knowledge of the least principal stress within, above and below producing intervals is essential for determining fracturing procedures that limit vertical propagation of hydraulic fractures to the intended range of depths. To better understand the cause of varying stress magnitudes...

... integrity stress magnitude prediction Zubair Formation pore pressure borehole collapse Drilling horizontal stress rock mechanical property shear failure Petroleum Science southern iraq ARMA 19 1525 Using an Analytical Model to Predict Collapse Volume during Drilling: A Case Study from Southern...

... are required to obtain stress estimates of acceptable reliability. In this paper, we investigate the effect of sample size – i.e., number of stress measurements – on the uncertainties associated with point estimations of both principal mean stress magnitude and orientation. We use Monte Carlo simulation...

... tests or implied from the regional tectonic setting. To date, borehole breakout analysis has provided some assistance for the orientation of the stress field, although very little has been done to correlate breakout with stress magnitude. This paper proposes a methodology of predicting stress from...

... ABSTRACT: A novel true triaxial testing apparatus was used that is equipped with flexible membranes pressurizing cylindrical core samples in the two orthogonal radial directions with independent stress magnitudes. We report the experimental investigation carried out to capture the true...

..., where undisturbed rock is accessible, techniques such as over-coring, flat jack test, hydraulic fracturing, and borehole slotter (Jaeger et al., 2008, Amadei and Stephansson, 1997) can be used to measure the stress magnitudes at the study region. In the case of unconventional reservoirs, however, access...

... operate simultaneously to determine the resulting magnitude of horizontal stress and of effective stress ratio. Depending on the stress regime, they may work in concert with or in opposition to each other. In the cases considered here, variations in horizontal stress magnitudes are smaller than predicted...

... the local variability in stress magnitudes across different lithologies while generally agreeing with a regional stress model from the literature 1. INTRODUCTION When designing excavations at depth, the stress model used in empirical, analytical, and numerical tools plays a significant role...

... Abstract A geomechanics study on the safe and economical extraction of the Craig Pillar at Morrison Mine was initiated in mid-2013. Historical and future mining at Morrison raised concerns that elevated in situ stress magnitudes would be encountered during pillar extraction. A multi stage...

... Abstract We present in this paper two examples on two different scales (in borehole and regional), in which stress magnitudes might be influenced by the presence of fractures and faults. Hydraulic fracturing in situ stress measurements conducted in a borehole showed a large fluctuation...

... Abstract In-situ stress magnitude and orientation have long been analyzed separately using classical statistics, despite the fact that stress is a tensor, and it should be analyzed using tensor-related methods. In this paper we investigate the applicability of a two dimensional aleatory model...

... are discussed, followed by suggested future work. constraint Reservoir Characterization orientation Upstream Oil & Gas stress magnitude regime Hmax fracture borehole breakout borehole Newark basin principal stress modeling co 2 breakout hmin reservoir geomechanics strength natural...

... Abstract : Knowledge of the in situ stress state is an essential element of a geomechanics study. Current methods of evaluating in situ stress are based on direct and indirect measurements on the centimeter to kilometer scale. A new core-based technique to estimate in situ stress magnitudes...

... for core disking in and around core stub. Reservoir Characterization stress magnitude numerical analysis horizontal stress Upstream Oil & Gas reservoir geomechanics AMT criterion maximum tensile stress initiation diagram underground research laboratory drilling operation Martin...

... boundary condition Artificial Intelligence displacement geomechanical modeling information topology reservoir geometry stress field friction coefficient horizontal stress material parameter reservoir model reservoir geomechanics stress magnitude calibration minimum horizontal stress...

... on the breakout azimuth, an ambiguity occurred that the breakout width to constrain stress magnitudes widened significantly with time in an order of hours. Two independent borehole wall images of the same depth interval, captured at the bottom and the top of the 30m long logging-while-drilling (LWD) bottom-hole...

... shale and shale oil reservoirs exemplify the unique nature of the unconventional reservoirs from their conventional counterparts. Reservoir Characterization shale gas Upstream Oil & Gas log analysis Directional Drilling well logging drilling operation stress magnitude shale reservoir...