Wireline core drilling method can take out the core without having all the drill rod out of the borehole, which can have high drilling efficiency and low labor intensity. Therefore it is the most popular among all core drilling method currently

Wireline Drilling Tools Configuration

Wireline tools mainly consist of rope, overshot assembly head assembly, outer tube, Inner tube and bit.

When the inner tube is full of core, the inner tube can be taken out of hole with core by overshot assy. which is driven by the winch mounted in the core drill rigs. Then the the new empty inner tube can be put into the hole simultaneously people can working on the previous inner tube to take off the core.

In this way, it will definitely improve the drilling efficiency and save manpower

Below is the overshot assembly configuration

This is the double tube core barrel assembly description

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