Sample Preparation

Wellsite Services

X-Ray Tomography

Extraction and Drying

Porosity and Permeability

Mini Permeability

Oil and Water Saturations

Particle Size Analysis

Core Resination and Photography

Sidewall and Drill Cuttings Analysis

Core Storage and Core Workshops


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

Sample preparation
At PanTerra we are able to process large quantities of core with short turn-around times. Proper core handling and core preparation procedures help to ensure reliable analitycal results.
Laboratory preparation
Core layout for core preparation or core workshops.

Core preparation starts immediately upon arrival of the core barrels at the PanTerra laboratory. This preparation includes layout, cleaning, measuring and mark-up of the core. During these operations close attention is paid to the proper matching and orientation of core fragments. Preparation is generally completed on the day of the core arrival.

During the core preparation process, Spectral Core Gamma is recorded and special sampling takes place: hot shot samples (for a fast turn-around time for porosity and permeability data), samples for fluid saturation and halite tests and samples that have to be preserved are taken immediately after the core has been retrieved from the barrels.

Whole core and core preservation
Whole core sections are either simply wrapped or undergo a special treatment to keep them close to the natural state of the core as “preserved samples” for future analysis. Sample preservation is undertaken by sealing a core section with an impermeable plastic coating.
Standard core plugs

Samples are taken at selected locations or at fixed intervals and are subsequently used for a wide variety of analyses performed to determine physical, chemical and geological parameters important for the evaluation of the  (potential) reservoir. Plugs of standard length and diameter are taken either “horizontal” (perpendicular to the core axis and parallel to the inclination) or “vertical” (parallel to the core axis). These plugs are obtained by drilling cylinders from the core using lubricants such as water, brine or oil and trimming the ends of these cylindrical samples. Standard plugs are used for the determination of oil and water saturation, porosity, permeability and grain density measurements (at ambient pressure or at higher pressures to mimic sub-surface conditions) and for a variety of Special Core Analysis tests.

Sampling of unconsolidated sediments
Unconsolidated sample in a teflon sleeve.

Drilling as is done for consolidated materials cannot be used for the sampling of unconsolidated sediments such as compacted sand, silt or clay. PanTerra uses a custom-built plug-cutting device (the "plunge cutter") to obtain standard plugs from these materials. This plunge cutter contains a sample holder lined with a teflon sleeve. The sample holder is hydraulically pressed into the core at the selected location and the unconsolidated material is fixed in the teflon sleeve with the help of screens on both ends. The teflon sleeve is subsequently heat-shrunk at the ends so that the sample plug is preserved in its original condition.

Advantages of this technique:
- Freezing or another pre-treatment of the core is not necessary;
- The teflon is transparent, allowing visual inspection of the sample prior to analysis;
- The plunge cutter system is mobile and can be shipped to other locations.

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