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Drilling Systems

Overburden Drilling Systems Overburden Drilling System collage

Symmetrix Systems - The all-in-one Symmetrix design is an ingeniously patented simple concentric method of drilling through overburden using casing. The expediency and high capability of Symmetrix can drill straight holes at any angle whether vertical or horizontal and to a depth of over 100 meters.

All components in the patented Symmetrix system work as one efficient drill bit with features that include:

  • Pilot bit with large internal flushing grooves
  • Symmetrical ring bit (reamer) with internal bayonet coupling
  • Casing shoe for driving of casing
  • Pilot bit is attachable to any common DTH hammer shank or top hammer rod thread


Symmetrix Systems

STD System
W System
N System

Stratex PhotoStratex Overburden Drill System and Accessories -- 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.

Eccentric System
Drop-off System
Centro System
Accessories

Xs SystemXs Drill Systems - This new patented overburden casing system is becoming popular amongst users of both ring bit and eccentric drilling equipment. It is the Easiest and Fastest way to drill and case a hole at the same time in difficult overburden soil. We are offering different systems, depending on if the casing is left in the ground or if it needs to be retrieved, and the depth of the hole and different other variables.

With a variety of casing shoe designs it is adaptable to all casing needs; however, the Xs Drill™ system is found to be particularly useful in deep overburden where rocks and boulders are a problem.

The Xs Drill™ system is simple in operation and has many advantages over conventional techniques: The same large DTH hammer is used for setting and for sub-drilling. For example, when setting 6 5/8" O.D. casing, a full size 6" hammer can be used. The use of a 6" hammer offers advantages over using the conventional 5" hammer, adding more blow energy and greater flushing air at depth. These advantages result in faster drilling and greater depth capability.

When the casing has been set, the same 6" hammer and special 6" diameter drill bit (Square bit™) can be passed through the casing crown to continue drilling a 6" diameter hole to the desired sub-casing depth.

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