Description
The HUC Series consists of hydrostatic core holders integrated with acoustic sensors, making them ideal for ultrasonic studies involving fluid displacement in porous media. A key feature of these core holders is their ability to apply equal radial and axial confining pressures. The cell assembly includes specialized acoustic platens designed to facilitate the transmission of compressional (P) and shear (S1/S2) waves through rock specimens under controlled overburden pressure and temperature conditions. Measurements performed on rock samples at varying confining pressures allow for the determination of compressional and orthogonal shear wave velocities, dynamic elastic constants, and simultaneous assessment of rock permeability. A cylindrical core sample is placed inside a Viton sleeve and positioned between a fixed acoustic platen at one end and a floating acoustic platen at the other. Confining pressure is applied using an external pump to ensure firm contact between the core sample and the acoustic platens, accommodating a variety of core lengths. Coaxial feedthroughs facilitate the monitoring of acoustic signals from the acoustic floating platen. Pore fluids enter through the fixed acoustic platen, flow across the core sample, and exit via a ¼” diameter tubing connected to the floating acoustic platen. To replace the core sample, the confining fluid must first be drained, and the end plugs unscrewed by rotating it counter clockwise. This action removes the entire assembly—fixed acoustic platen, sleeve, core, and floating acoustic platen—allowing the core to be extracted from the sleeve. A new core can then be loaded by reversing the process.
Specifications
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Standard
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ASTM (D2845)
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Maximum confining pressure
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70 MPa (10,000 psi)
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Maximum temperature | up to 120°C |
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Acoustic waves
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P, S1, S2
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Frequency
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1 MHz
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Sample diameter
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1 and 1.5 inches
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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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Pore inlet
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1
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Pore outlet
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1
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Port fittings | 1/8 inch
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Benefits
Tests performed on a series of rock specimens under different pressures and temperatures allow the user to determine:
* Compression and two orthogonal shear wave velocities
* Dynamic elastic constants
* Rock permeabilities
Download Hydrostatic ultrasonic cell brochure.pdf