reverse circulation sampling
Reverse circulation is a method of drilling using high pressure air and a dual-walled drill pipe. High pressure air is forced down the drill rod annular between the inside pipe (sample tube) and the outside pipe. When the air reaches the RC hammer to implement high-frequency blows acting on a reverse circulation drill bit where the reverse circulation is formed. The compressed air and drill samples move up through the hollow inner tubes to the drill rig head where it is diverted to the cyclone. The drill cuttings travel around inside of the cyclone until they fall through an opening at the bottom and are collected in a sample bag.
Reverse circulation offers a more cost effective method for getting the preliminary geological data required prior to investing in more detailed geological data from an exploration coring program. Reverse circulation is also faster than coring which means more holes drilled.
Speight Drilling are safe and compliant reverse circulation drilling contractors that employ the most progressive field designed safety innovations. By continuously investing in efficient and safe reverse circulation coring rigs and equipment, you can count on Speight Drilling for industry leading core recovery rates and up-time.