Capillary pressure and resistivity system Routine core analysis Instruments

The system simultaneously determines on rock samples, the capillary pressure - air/water saturation relationship, by virtue of the porous plate method, as well as the rock and fluid electrical properties via the two point method. The system’s modular architecture easily warrants the integration of multiple core holders into the apparatus. Samples can be subjected to moderate temperature and high, reservoir-representative confining pressure. A cylindrical sample fitted in a Viton sleeve, is inserted into the core holder and the desired confining pressure, applied. The drainage process is achieved by injecting pressurized gas into the core. At a particular injection pressure, the gas will displace a specific quantity of water. A semi-permeable porous plate, placed on the bottom of the core (outlet) enables desaturation at specified pressure increments while retaining the gas phase. The amount of water produced is recorded in a volumetric burette placed at the core holder outlet. The capillary pressure corresponds to the measured pressure drop across the sample, while the electrical properties are determined from a two-electrode resistivity meter. The system’s modular architecture easily warrants the integration of multiple core holders into the apparatus.

Pore pressure :

• up to 500 psi

Overburden pressure :

• up to 10,000 psi

Temperature :

• up to 90°C

Core diameter :

• 1" or 1.5"

Core length :

• up to 3"

Resistivity measurement :

• 2 electrodes

Resistivity accuracy :

• 0.1%

Test :

• gas/liquid and liquid/liquid

Capillary pressure cycle :

• forced drainage

Wetted parts :

• stainless steel

Power supply :

• 110-220 VAC, 50 or 60 Hz

Fluid types :

• stock tank oil, lab-oil, brine, nitrogen, gas

Nitrogen requirement :

• 500 psi