CAPRI-Capillary pressure and resistivity system


The CAPRI system performs at reservoir-representative conditions, both drainage and imbibition experiments on core samples while simultaneously determining the rock electrical properties. From these results, the relationships between core saturation profile, capillary pressure and electrical properties can be deduced. Specifically, saturation exponent “n”, formation factor and cementation exponent “m” are calculated. The instrument consists of a core holder furnished with hydrophobic and hydrophilic ceramics, a four electrode configuration for resistivity measurements, a precise, automated flow control system and a resistivity cell dedicated to brine resistivity measurements. Isothermal testing conditions are assured by a temperature-controlled convective heat transfer air bath.


Maximum confining pressure: 700 bar (10, 000 psi)
Max pore pressure : 700 bar (10,000 psi)
Working temperature : up to 150°C
Capillary pressure range: -10 to +10 bar (145 psi)
Core length : 2” up to 3”
Core diameter: 1 ½” other upon request
Power supply: 220VAC, 50Hz
Brine wetted material : stainless steel (option Hastelloy)


* Measurements are made at reservoir conditions of pressure and temperature
* Direct capillary pressure measurements
* High-temperature pumps located in the isothermal air bath are used to prevent temperature related volume measurement errors