Refrigerated overburden centrifuge Special core analysis Instruments

The refrigerated overburden centrifuge enables fast, simultaneous measurement of capillary pressure properties and relative permeability curves on up to six core samples, operating at both atmospheric and reservoir conditions with temperatures reaching up to 90°C. The device can also be utilized for sample reservoir condition restoration. Custom designed sample chambers can house core plug samples up to 1.5 inches in diameter and rotate them to a maximum velocity of 4,500 rpm. The apparatus consists of a rotor and cells (core holders) which can accommodate either 1”, 30 mm or 1.5” diameter cores. A digital camera continuously captures high resolution images of the cells, thereby enabling a visual surveillance of the displaced fluid volumes in each cell. An electronic speed control module with sequential speed variation capabilities, and a precision temperature control system are integrated into the device. If the maximum specified temperature is exceeded, the temperature is automatically adjusted accordingly. Furthermore, a rotor imbalance sensor ensures a safe, viable operation.

Oil-water drainage :

• 0 to 14.9 bar (+216 psi)

Oil-water imbibition :

• -0 to -18.8 bar (–269 psi)

Air-water drainage :

• 0 to 44.6 bar (+647 psi)

Air-water imbibition :

• 0 to -55.6 bar (–806 psi)

Temperature :

• 5°C (@speed = 0) to +90°C

Speed :

• from 50 up to 4500 RPM

Speed regulation :

• ± 1 rpm

Speed step overshoot :

• limited to 5 rpm

Acceleration :

• 1 to 1,000 rpm/min

Large radius :

• 23 cm

Power supply :

• 400 V3~+N(50-60Hz) / 208 V 3 ~ + N (60Hz)

• Simultaneous testing of up to six core samples, enabling fast determination of capillary pressure and relative permeability curves.
• Operation at both atmospheric and overburden conditions, suitable for drainage and imbibition tests on consolidated and unconsolidated cores.
• High-precision digital camera system, providing continuous, high-resolution monitoring of displaced fluid volumes.
• Advanced temperature control up to 90°C, ensuring accurate measurements under reservoir-temperature conditions.
• Automated data acquisition and robust simulation software, enabling automatic calculation of saturation, capillary pressure, and Kr/Pc curves through history matching.
• Capability to perform centrifuge tests under pore pressure up to 1,450 psi, enabling studies of brine/gas systems (including CO₂ and H₂) at realistic reservoir conditions.