Wireline drill tools can lift drill core from drill rods without picking up bits.All the tools include principal parts of the drill tools,overshotassembly ,drill rods.holding dog,circle wrench and etc,their advantages are higher penetration,higher core recovery ratio.longer bit life and lower our ab intensity,and the advantages get more clear with the increasing of hole depth.

The double tube wireline core barrel is converted to triple tube by incorporating a split steel tube inside the inner tube. inaddition, a piston and pump-out adaptor is provided for pumping out the split steel tube when it is full of rock core. Thestop ring, core lifter case and core lifter also differ from the standard double tube core barrel. being slightly smaler in diam.eter in order to accept and retain the slightly smaller core.

Advantages:

1.Faster coring at greater depths 

2.Good stability due to constant diameter of the drill string

3.excellent hydraulics

4.Good core recovery