Electrical rock properties

Capillary Pressure

Relative Permeability


Sor, Swir and Srg

Whole Core Analysis

Sonic Velocity

Cap rock Analysis

Pore volume compressibility

NMR Core Spectrometer


Weversbaan 1-3
2352 BZ Leiderdorp
The Netherlands
P +31 71 581 3505
F +31 71 301 0802

Relative permeability
PanTerra has various methods available to determine relative permeability curves. These tests are often complex and there is no single best method. Depending on lithology, rock properties and budget, PanTerra can recommend an analytical program suitable for your samples.
Waterflooding / EOR
Waterflood tests are available to evaluate waterflood efficiency. This includes Swir and Sor oil recovery versus pore volumes of water injected and oil recovery versus water cut. Various fluids can be used to evaluate the change in Sor.
Critical velocity / mobile fines
Fines migration analysis, permeability damage due to finesThe interaction between reservoir rock and non-native fluids introduced during drilling or injection processes, can increase or decrease permeability. Flowing liquids at multiple flow rates or certain volumes through core samples provides information about critical velocity, migrating fines through pores space or permeability alteration due to incompatible fluids.
Unsteady-state relative permeability (core flood)
This is a basic and inexpensive linear displacement test for immiscible and incompressible fluids. For data analysis, the Johnson-Bossler-Naumann (JBN) and the Jones-Roszelle methods are used. Operational difficulties as capillary end-effects and viscous fingering should be considered in the analysis. Unsteady-state method is particularly suited for measuring endpoint values of the non-wetting phase (effective permeability, Kg@Swir). This test can be performed at ambient conditions or at reservoir conditions.
Unsteady-state centrifuge relative permeability
Single speed centrifuge relative permeability of the displaced phase can be used for low permeability samples. This test provides Krw or Kro values down to true Sor or Swir. Centrifuge relative permeability can be used as an ‘extension’ to coreflood relative permeability.
Reservoir condition steady-state relative permeability
For some samples and in some conditions, a steady-state relative permeability will give more representative data. Our recent added automated reservoir condition system can measure relative permeability temperatures up to 150 degrees Celsius and pressures up to 10,000 psi.
Customised core flow tests
Gas Oil Ratio of live fluids and formation volume factor determinationVarious acidizing core flow tests or regained permeability tests are also available at PanTerra. More information on this can be found at this website under the Production Chemistry section.
Simulation and history matching software
At PanTerra, we have the capability to run computer simulations of coreflooding experiments. Two-phase properties like Capillary Pressure and Relative Permeability can now be determined using numerical calculations. Futhermore, various effects like capillary end-effects, can be incorporate into the simulation and the experimental data can be compared to the simulated flow tests. 

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