Overburden Drill Bit overburden drilling system 70mm - 400mm OD - Product

Other Specification :  Overburden Drill Bit Overburden Drilling System 70mm - 400mm OD Details Description: The Stratex Drill System The Stratex Drill System (SDS) Is An Overburden Drilling System Designed For Conditions Where A Cased Hole Is Required. Collapsing Holes Tend To Make Overburden Drilling Expensive, With Lost Drilling Equipment And Down Time. In Cooperation With Drillers And Drilling Contractors, The SDS Was Developed To Overcome These Problems. The Patented Eccentric Design And The Drop Off Ring (DOR) Drill Bits Enable The Drill String And Casing To Be Lowered In The Hole Simultaneously With A Conventional Hammer Drilling System. The SDS Eccentric Designed Bit Rotates Outward And Drills A Larger Diameter Hole Than The Casing, Avoiding Cave-ins, Wash-outs, And Other Problems Common In Normal Drilling Operations In Soft And Gravel-type Strata Or Loose Rock. Since 90% Of The World's Overburden Drilling Is In Loose Strata, Potential Utilization Of The SDS Is Enormous. After Reaching The Designated Depth, The SDS Reamer-bit Is Retracted By Reversing The Direction Of The Rotation And By Applying Tension On The Reamer-bit, Which Has A Taper And Will Retract Into The Casing For Easy Removal Of The Entire Drill-string. This Leaves The Casing In Place For Other Applications Or For Removal At A Later Date. The SDS Method Is Designed For Use With Flush Joint Threaded Pipe Or Welded-type Casing And Provides A Bit Size For A Wide Variety Of Different Casing Wall Thicknesses. Advantages Of SDS: Low Capital Investment High Drilling Performance No Rotation Of The Casing Compatible With Most Drilling Rigs Virtually No Casing Stress Casing Is Simultaneously Lowered By The Guide Device And To Deeper Depths Than Other Methods Allow Cost And On-site Time Reduced Due To Better Penetration Rates, Easier Bit Changes, And Stable Hole Co

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