Description
PREPEAK is a pump-actuated triaxial rock compression test system designed to apply deviatoric stresses to the core sample, facilitating anisotropic stress states. It features a built-in hydraulic piston that applies an axial load on the specimen, allowing distinct radial and axial confining pressures to be applied. Unlike equipment designed for rock-failure testing, PREPEAK is optimized for pre-failure loading where the rock remains intact. This stability is essential for advanced acoustic, petrophysical, and mechanical measurements, which rely on precise, well-controlled stress states rather than inducing failure. Each unit can be custom-configured to meet specific requirements, offering a wide range of pressure capacities, temperature limits, specimen sizes, and test modules to provide a fully tailored solution. When corrosive fluids are used, the stainless-steel wetted parts can be substituted with Hastelloy components.
Specifications
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Pore pressure range
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0-70 MPa
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Confining pressure range | 0-70 MPa |
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Axial stress range | 0-70 MPa |
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Axial load range | 0-445 kN |
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Temperature range | -20 to 150°C |
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Sample diameter | up to 54.7-mm
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Sample length | Twice the length |
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Wetted part material
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Stainless steel / Hastelloy
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Loading
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Hydrostatic / Triaxial
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Pore port fittings | 1/8 inch LP
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Benefits
* Measures rock deformation & storage: creep, compressibility, stress-dependent porosity
* Measures petrophysical & elastic properties: Stress-dependent permeability, Vp/Vs, resistivity
* Measures rock damage & fracturing: microcracking and fracture growth via acoustic emission