.... In vertical exploration wells we may also deduce the minimum horizontal stress direction from borehole breakouts. Aadnøy [1] developed an inversion technique in 1990. Since directional wells have different orientations (inclinations and azimuths), independent fracturing equations were derived. These were...

... Installation and Operations Upstream Oil & Gas orientation strength sand production perforation collapse test reservoir pressure horizontal stress pressure depletion prediction model reservoir pressure depletion saturation perforation critical drawdown pressure wellbore vertical well ARMA...

... horizontal stress which are significantly larger than the accompanying changes in total vertical stress. Since the response of any discontinuities depends on their orientation relative to the principal stress axes, the anisotropic changes in the total stress field resulting from production can lead...

... in progress (Fig. 1). (available in full paper) Reservoir Characterization reservoir geomechanics Upstream Oil & Gas orientation strength stress magnitude Martin fault environment borehole site investigation horizontal stress repository design canister Fracture Zone investigation...

... hoc assumptions may however be relaxed. Reservoir Characterization reservoir geomechanics Upstream Oil & Gas overburden compressibility Reservoir Compaction Rudnicki depletion pore pressure pore compressibility Simulation experiment compaction sandstone horizontal stress...

... ABSTRACT: Leak off tests are routinely performed by the drilling industry and have been used for many applications including the determination of cement integrity, mud weight limit for the next hole section, and the estimation of minimum horizontal stress. The potential of these tests...

... shale empirical correlation diameter horizontal stress plane mud weight window small shale sample amplitude sequence diffusion constant mechanical data small sample interaction anisotropy ARMA/NARMS 04-564 Use of Small Shale Samples in Borehole Stability Analysis Nes, O.-M., Sønstebø...

... boreholes reveal that the average coal stress increases with the average rock stress. Reservoir Characterization reservoir geomechanics Upstream Oil & Gas Thickness coal mechanism seam Coal Basin horizontal stress coal seam database MPa sequence minimum stress Rock stress stress...

... production dimension borehole breakout borehole drilling-fluid flowrate longer breakout diameter horizontal stress specimen penetration rate far-field stress breakout length breakout Haimson fracture-like breakout principal stress Magnitude Pacific Rocks 2000, Girard, Liebman, Breeds & Doe...

... agreement. Reservoir Characterization reservoir geomechanics Upstream Oil & Gas bloch stress magnitude asr test anelastic strain poroviscoelastic solution contraction GPa horizontal stress anelastic strain recovery recovery input data MPa determination Portuguese stress field...

... 1. INTRODUCTION ABSTRACT : We conducted two series of hydraulic fracturing experiments. In one we maintained unequal principal horizontal far-field stresses; in the other the horizontal stresses were isotropic. Tested boreholes were instrumented with a device capable of monitoring diametral...

... a rock strength-size effect determined for boreholes of differing radii. These geometric characteristics of the simulated breakouts correctly matched our experimentally produced ones. The results suggest a means to estimate one of the principal in situ horizontal stresses when the other principal stress...

... ABSTRACT ABSTRACT: Thermal strain relaxation tests were carried out on core samples from southwestern Ontario and from the Paris Basin to assess the feasibility of the method in orienting horizontal stresses. The strain response for both sets of core was anisotropic and repeatable. Maximum...

... in this paper demonstrate that reverse-dip displacement along these near-surface faults is one factor leading to the observed near-surface reduction in stresses. The models also suggest that the horizontal stresses below the deepest fracture zone do not increase significantly with depth. Reservoir...

... orogeny. NE-striking fractures formed as a result of cooling and unloading during nearly 4000 ft (1220 m) of basin uplift since the Permian, and are aligned with the contemporary NE-directed maximum horizontal stress in the mid-continent region. Continued uplift and local reversal of the minimum...