Coreliner System (Triplex)

Coreliner is a clear, semi-rigid PVC tube that fits inside the inner tube of a core barrel and allows the rapid extraction of cores in their in-situ state. In principle, all double tube core barrels – conventional and wireline – can be quickly and easily converted to triple tube core barrels (sometimes called “Triplex”) –  by the addition of a plastic coreliner.

Core barrels that use the coreliner system require a special core bit, core lifter and (in some cases) special core lifter case, with a slightly smaller internal diameter than the standard type. This is because the core must be slightly smaller than usual in order to fit into the PVC coreliner.

This is a very good technique that enhances the quality of core and overall core presentation, especially advantageous when coring sticky, broken and soft formations. It has become the “industry standard” core handling system in those locations where coreliner is readily available.

Coreliner is supplied in standard 10ft (3.05m) lengths which are easily cut down with a hacksaw to 5ft (1.525m) lengths for use in 5ft /1.5m core barrels. Plastic caps are  available to seal the ends of the coreliner tubes..


  • Low cost method to convert double tube core barrels to triple tube
  • Cores preserved in their in-situ state
  • No disturbance or damage to cores is possible during core extraction or transportation
  • Major time saving advantage in core removal
  • Reduces wear and damage to core barrels
  • Great technique when coring sticky, soft or broken formations
Technical Data
Core BarrelStandard Core Diameter (mm)Coreline Core Diameter (mm)Coreliner Dimensions OD x ID (mm)Special Core Lifter Case required*
T2-6651.748.052.3 x 50.3Yes
T2-7661.758.062.3 x 60.3Yes
T2-8671.768.772.4 x 70.4No
T2-10183.780.784.4 x 82.4No
T6-7657.053.058.5 x 56.5Yes
T6-8667.063.067.0 x 65.0Yes
T6H x 78.5No
T6-11693.090.094.5 x 92.5No
T6-131108.0103.5109.5 x 106.5Yes
T6-146123.0118.0124.0 x 121.0Yes
NWL47.645.149.0 x 47.0Yes
HWL63.561.165.0 x 63.0Yes
PWL85.083.188.0 x 86.0Yes
HWF76.273.076.4 x 74.4No
PWF92.187.092.3 x 89.8No
SWF112.8107.0113.5 x 110.5No
412F74.773.078.8 x 76.8No
Mazier 10172.072.076.0 x 74.0No
GBS102.0102.0109.5 x 106.5No

*Special core bit and special core lifter is required for all core barrels when using Coreliner System.

Minimum order quantities of coreliners may apply for less popular core barrels