... by displacement, microfracture initiation, as indicated by strain gages adhered to the specimens. The pore over-pressurization method proves effective for creating tensile fractures in rocks with both milli- and micro-darcy level permeability. Results indicate tensile strengths ranging from 40 to 220 psi (0.3 MPa...

... triaxial amplitude Reservoir Characterization mechanics geomechanics symposium Castlegate sandstone Poisson strain gage frequency measurement Upstream Oil & Gas non-elastic effect stress state Symposium fjær gage strain amplitude strain rate stiffness stress path 1. INTRODUCTION...

... operation. The FO cable acts essentially as a long continuous ‘strain gage’ in the direction of the cable. As a HF propagates across each FO cable segment it sharply strains each one. This process allows a real time tracking of the position of the growing hydraulic fracture crack tip during testing...

... base for in-situ stress analysis during multi stage hydraulic fracturing and reservoir depletion due to production. reservoir geomechanics flow in porous media Fluid Dynamics variation coefficient strain gage hydraulic fracturing Bakken sample experiment Biot North Dakota procedure...

... We have installed several types of FBG strain and temperature sensors on the 4100 -level of the Sanford Laboratory at Homestake in Lead, SD in an alcove that measures 3 x 2 m and 2 m high (Fig. 1). In July 2009, we installed six Micron Optics Inc. OS3600 temperature-compensated strain gages...

... of the tested samples so that the distance from the borehole center to the outer boundaries is larger than 5a, where a is the borehole radius. Borehole strains and displacements were measured simultaneously at the two principal directions. Borehole strains were measured using T-grid strain gages with two girds...

... as for the triaxial tests. The stress rates for triaxial and uniaxial tests are the same. Strain gages were used for thirteen triaxial tests and all the uniaixal tests. Tests in three stress rates of the order of 0.4, 0.04 and 0.004 MPa/s and four confining pressures, 0, 5, 10 and 20 MPa were analyzed. Differential...

... ABSTRACT: A method for calculating convergences in tunnels by means of measuring strains at several points of its contour is described. Either by using electrical resistance strain gages or fiber optics Bragg gratings attached to the steel arches of tunnel support, or bars that may...

... hydraulic fracturing gage 1 grain size fracture development strain gage Upstream Oil & Gas clay content initiation gage 4 gage 2 Reservoir Characterization halite rock salt specimen specimen center compression argillaceous halite podular halite diameter clear halite gage...

... accurately using equations developed by Janssen (1895) for vertical or inclined silos. metals & mining dynamic load computer model strain gage gate assembly particle Load Factor Upstream Oil & Gas control gate assembly chute field test support bolt impact force assembly impact...

.... Displacements along cross-drift extensometers. 4 STRAIN DATA The CIP concrete liner sections installed over ap- proximately the final 12 m of the HD were instru- mented with strain gages to monitor the concrete be- havior during heating and cooling of the DST. Of this 12-m length, two different types...

... rock Upstream Oil & Gas complex reservoir fracture stiffness displacement thermoporoelastic property dual-porosity behavior strain gage fracture matrix conductivity ratio stiffness coupling equation Rock Mechanics, Daemen & Schultz (eds) ¸ 1995 Balkema, Rotterdam. ISBN 90 5410 552 6...

... Upstream Oil & Gas borehole rock condition host material USBM gage reservoir geomechanics temperature compensation strain value bedding thickness CSIRO cell Reservoir Characterization temperature change longitudinal bedding transverse bedding bedding strain gage gage stress...

... strain gages 45 degrees apart from each other, to obtain strain distribution on the surface of the coal blocks. One of the gages was mounted parallel to the bedding plane direction, another was mounled at an angle of 45 degrees from the bedding plane direction and the third was mounted perpendicular...

... US government Rockwell Hanford Operation Hanford site strain gage geomechanical testing development hydraulic fracturing Reservoir Characterization basalt Richland reservoir geomechanics Upstream Oil & Gas testing program doorstopper determination MPa flat jack test procedure...

... on availability, cost, impact on the installation scheme and subsequent mining constraints. The review included proving rings, strain gaged load cells, hydraulic load cells, instrumented bolts by strain gages and vibrating wire strain gages, and two ultrasonic technique. The newly developed vibrating wire...

... pressure cells at each level, and the corresponding strains were monitored with embedded strain gages. Data from each level are compared, and a detailed analysis of rock and concrete behavior at the 5191 ft level is given. The results of the rock displacement and concrete lining stress monitoring have...

.... The design load capacity is 5.0 x 106 lbs. (2.2 x 10 ? N) and 2.6 x 106 lbs. (1.2 x 111 J. H. Dieterich, D. W. Barber, G. Conrad, Q. A. Gorton BEARING PLATES ' FLAT JACKS STRAIN GAGES DISPLACEMENT TRANSDUCERS Figure 1 10 7 N) for the major and minor loading axes tively. This corresponds to nominal hydraulic...

... oil shale diameter shale oil tensile stress complex reservoir organic content split cylinder testing tensile strength loading plane Laramie Energy Research Center mechanical property gage Reservoir Characterization Upstream Oil & Gas plane strain gage perpendicular...

... Upstream Oil & Gas grain size gage Reservoir Characterization Rock mechanics Existence stress field principal direction residual strain granite reservoir geomechanics microresidual stress rosette stiffness self-equilibrating unit mechanism strain gage residual strain field...