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Wireline Double Tube Core Barrels

Wireline core barrels are used when coring to greater depths, mainly because they eliminate the need to couple and uncouple the rod string each time the core is retrieved. An overshot device is dropped on a cable and directly couples onto the inner tube assembly, allowing fast retrieval of the core after each core run. Available in DCDMA sizes B, N, H. and P.

Advantages:

  • Faster coring at greater depths
  • Good stability due to constant diameter of the drill string
  • Excellent hydraulics
  • Good core recovery

Technical Data

Specification Core Barrel Type
B W/L N W/L H W/L P W/L
Hole Diameter (mm) 59.9 75.7 96.3 122.8
Core Diameter (mm) 36.4 47.6 63.5 85.0
Kerf / Crown Thickness (mm) 11.6 13.9 16.2 18.5
Cutting Area (cm2) 18.3 27.2 41.1 61.7
Hole Area (cm2) 28.3 45.0 72.8 118.5
Cutting Area as % of Hole Area 64% 60% 56% 52%
Core Area (cm2) 10.3 17.8 31.7 56.8
Recommended Drill Rod B W/L N W/L H W/L P W/L
Recommended Casing BW NW HW PW
Conversion to triple tube possible Yes Yes Yes Yes

 

Key to Main Parts of W/L Core Barrel Assembly

Complete core barrel consists of:

1. Core Barrel Head

2. Inner Tube 1.5m or 3.0m

3. Stop Ring

4.Core Lifter

5. Core Lifter Case

6. Locking Coupling

7. Adapter Coupling

8. Landing Ring

9. Outer Tube 1.5m or 3.0m

10. Inner Tube Stabilizer

11. Thread Protector






Core Bit  and Reaming Shell are not supplied as part of the core barrel assembly, but must be chosen correctly to match the particular application and rock formation.  Please refer to our Core Bits page for further details.