... ABSTRACT: Tests in triaxial cells are usually performed on cylindrical specimens, for which axial and circumferential devices are required. A clip gage clips onto the specimen at distinct reference points and integrates the observed straining over a reference (gage) length. Since the clip...

... experiment reservoir geomechanics creep response axial pressure step Faulkner creep strain ductile behavior lateral direction Upstream Oil & Gas differential stress step strain response differential stress Magnitude Shale gas Reservoir Rock deformation damage zone 1. INTRODUCTION...

... laboratory measurements presented in this paper report a modulus value and one can estimate compressibility from them. Upstream Oil & Gas Reservoir Characterization compressibility Berea sandstone pore pressure grain modulus strain gauge experiment laboratory helium pressure axial shale...

... and Franklin [2] provided a comprehensive investigation of the impact of sample size on the point load strength index to define accepted unified size dimension for conducting point load tests. They found that as diameter increased, the point load strength index decreased for both axial and diametral testing...

... and development Reservoir Characterization displacement axial Ground Control Upstream Oil & Gas rock bolt metals & mining faceplate rock bolt behavior proceedings loading load distribution strain gauge international conference rock mass grouted rock bolt situ performance new technology...

... is presented. The facility is designed to capture expected coal seam reservoir conditions under primary CBM production and ECBM/CO 2 storage operations. The facility is designed to measure multi-component gas and liquid permeability at independent axial and radial stress conditions. Two types of testing cells...

... duration tends to excite smaller nonuniformities; 4) the maximum tension stress is proportional to the initial hydraulic stress. Results from simulating the rock splitting process under axial unloading conditions were cited to verify the present model. As the model predicted, extension fracture could only...

... ABSTRACT: This paper describes the results of high pressure triaxial tests conducted on Pierre Shale, up to mean effective stresses of 15 MPa. The specific aim of the tests is to describe the effect of stress path on strain and sonic response. Stress path is controlled through axial and radial...

... to the change in moisture content could be measured. Brine always caused immediate changes in axial, radial, and volumetric strain rates. Strain rates returned to their pre-brine-introduction values only for tests conducted with confining pressures greater than 3.5 MPa. These data indicate that permanent...

... ABSTRACT ABSTRACT: Pipe tests have been performed to determine the swelling pressures of 60 mm diameter bentonite plugs and of 64 mm diameter cement plugs. The axial and radial swelling pressures of a bentonite plug specimen increase up to 7.5 and 2.6 MPa after adsorbing water for 5 days...

... been prepared. The rock fails through the development of arrays of microcracks which form around grain boundaries and are initiated at notches on pore spaces. No special microstructural characteristic appears to be associated with the peak strength, and axially oriented cracks do not begin to develop...

... compaction hydrostat frictional fracture development ultimate strength hydraulic fracturing strength axial MPa fracture shortening deformation Berea sandstone volumetric strain specimen normalized axial precut axial shortening dilatancy PORE VOLUME CHANGES A SOCIATED WITH FAILURE...