Abstract
Under dynamic loading, the geomechanical properties of porous clastic rocks differ from those in quasistatic loading. A small experimental rig was built to directly assess the influence of vibrations on the uniaxial compressive strength (UCS), Young modulus, and Poisson’s ratio. A piezoelectric actuator powered by a signal from an oscillator was used in the rig as a generator of vibrations. A laser sensor and eddy current probe measured the longitudinal and transverse deformation. Tinius Hounsfield and Instron Series 4483 installations were used to determine the geomechanical properties of new red sandstone in a quasistatic regime. The boundaries of elastic deformations determined in the quasistatic loading were implemented in the dynamic loading. To perform the experiments in the elastic zone (on the graph of stress (σ)–strain (ε)), small samples with diameters ranging between 7.5 and 24.7 mm were manufactured. The investigation demonstrated that the Young’s modulus of the sandstone increased with increasing values of the dynamic load and frequency.
Highlights
The dynamic geomechanical properties of rocks are a type of physical property that characterizes the ability of rocks to sustain a loading that changes in force amplitude over time
Geomechanical properties alter under dynamic loading at all stages of reservoir engineering, such as the drilling [1,2], completion [3], and treatment [4,5,6,7,8] of wells, as well as reservoir production [9,10,11,12]
Determining the dynamic geomechanical properties of rocks in reservoir engineering is crucial in the following examples
Summary
The dynamic geomechanical properties of rocks are a type of physical property that characterizes the ability of rocks to sustain a loading that changes in force amplitude over time. Dynamic mechanical properties are widely used in many other fields, such as civil engineering [13,14,15,16,17], medicine [18,19], and marine structures [20,21]. These areas use different kinds of mechanical properties, the basic principles are similar. The amount of additional oil-in-place, produced as a result of hydraulic fracturing, depends on the dynamics of crack propagation and the behavior in time, which is mainly controlled by the rock geomechanics [23,24,25]
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