The mining industry uses Core drilling as its main mode of exploration. In the Western United Sates, core drill exploration for copper, gold and silver is a year round venture. The concept of core drilling is very simple, a rod is attached to a diamond carbide bit with an open end. A typical size and type rod is a NQ coring rod. A NQ rod is measured in millimeters with a outside diameter of 69.90mm and a inside diameter of 69.30 or 2.75 inches OD by 2.72 inch ID. The idea is to spin the bit just fast enough to create a core that is then pushed inside the rod.
After a few feet the core is extracted using a retrieval tool. In order to keep the core intact and the bit cooled a bentonite drilling gel and water is required. As the diamond bit cuts out the desired core, very fine drilling cuttings are created. These ultra fine cuttings can cause many issues down the hole such as broken cores, lost cores, and premature bit wear. With less than .60 mm tolerances it is important to keep the drilling fluid clean. A desirable clean fluid would be any fluid less than 9.0lbs per gallon mud weight and a sand content of less than 1%.
A Mud Puppy solids control unit can remove the ultra fines by using its de-sanding cones allowing the fluid to stay below 1% sand. The scalping screen and desander will manage the mud weight at or below 9.0lbs if used correctly. By keeping the mud weight down it will allow you to use the minimal amount of drilling fluid neccessary to complete the job. In coring, it is imperative to retrieve good cores and move to the next hole and with a Mud Puppy solids control system the odds of staying on schedule and being successful are increased.
TIBBAN MFG Inc.
15064 Anacapa Rd.