By: Todd Wheatley

(tiktok transcript)

As you saw in the previous video the process of wash drilling is the same as done in the oil field - only at a smaller scale -unlike the oil drillers, however, we seek to recover the rock intact instead of simply chewing it up - to accomplish that goal we use a specialized core barrel that allows the rock to slide up through the center as the rod advances - at the start of this video the drillers are breaking the rock laden inner barrel from the core barrel assembly - the lead driller then removes the "shoe" from the inner barrel to allow the rock to slide out - if all goes well, a 5 ft stick of solid rock will emerge - things rarely go well due to rock fissures and soft layers or any number of complications both in the drilling process and in the rock formation -in fact it's common for the rock to lodge within the inner barrel requiring the drillers to fight it loose without damaging the equipment - in this video you will see the driller bounce the assembly to free the rock core

GEOTECHNICAL DRILLING SLIP-RING tiktok

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