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

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 conditions

Smaller pilot bit for faster and better penetration

Applications:

Blast holes

Water supply wells

Bridge and building foundations

Standard slant or horizontal drilling

Mining air holes

Environmental monitoring wells

Grouting operations

Seismic shot holes

Soil sample and geotechnical applications

Ground anomaly and tiebacks

Storage caverns and dam

Accessories Available with SDS:

Drop Off Ring (DOR)

Drill pipe and subs

Threaded casings

Casing drive shoes

Hydraulic casing pullers

Stabilizers

Discharge heads

Casing wing-nuts

Shock subs

Drill bits

Fishing tools

Air swivels