... hydraulic fracturing Daneshy fluid pressure Reservoir Characterization pressure data pressure drop reservoir geomechanics Upstream Oil & Gas variation plane stress measurement principal stress Magnitude determination fracture perpendicular fracture length fracture plane...

... ABSTRACT ABSTRACT: The modulus of deformation of a rock mass as determined by in situ testing is always less than the modulus determined from intact cores taken from the rock mass. It is generally concluded that structural features such as joints are primarily responsible for the reduction...

... reservoir geomechanics Simulation Upstream Oil & Gas Reservoir Characterization strength cohesion sandstone determination petrophysical property crack length porosity compressive strength Jackfork sandstone experimental determination hydraulic fracturing international society...

... cohesive-frictional model. Damage is represented by a second rank symmetric tensor. The damage evolution rate is related to tensile strains. The damage effect on plastic flow is also considered. A simple procedure for the determination of model parame- ters from standards tests is proposed. The validity...

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

...: A low cost methodology that allows the determination of in-situ stress using oriented core specimens has been investigated. The technique can be used to determine the stresses during the early stages of a project, even in undeveloped areas of a mine. Initially the research aim was to compare...

.... Failure of the specimen is achieved by separation of the loading platens, and the tensile strength of rock material is determined. The location where the tensile fracturing starts, and the direction of the crack propagation is predetermined in the hoop test. With initial notches on both sides of the inner...

... for determination of the law of variation of the yield stress with depth from data is outlined. A flow-no flow criterion is formulated. It is shown that the model predicts well the depth at which shear flow initiates and the thickness of the shear zone. All parameters involved in the visco-plastic model...

... ABSTRACT: Many devices have been developed over the years for the determination of the tensile strength of rock materials. The devices use both direct and indirect methods in the testing and subsequent determination of rock tensile strength. Obviously, the direct pull tensile test...

... for learning pattern. All the test run showed sufficient accuracy. 1. INTRODUCTION Accurate and resonable rock mass classification is needed to design and construct underground rock structures safely and economically. Rock classification methods are empirical ones to classify the rock mass and determine...

... ABSTRACT ABSTRACT: Field tests at a depth of 5000 ft, in the Lower Frio Formation (Jasper County, East Texas), demonstrated that core testing, log interpretation, and micro-fracturing techniques for in situ stress determination need to be modified when investigating unconsolidated sandstones...

... ABSTRACT ABSTRACT: Strains measured on the surfaces of rectangular prisms machined from low porosity, low permeability rock cores are used to determine that portion of the porosity comprised of small low aperture cracks. In these measurements, which are similar to the the differential strain...

.... metals & mining displacement pillar stiffness south african institute chain pillar relation coal proceedings stability longwall face height ratio pillar stiffness determination mechanics data mining Longwall Mining post-failure stiffness application pillar bump Rock Mechanics...