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Symmetrix Drilling System

Synergy has invested in the most advanced drilling technology for loose or unconsolidated ground. This technology will enable Synergy to tackle jobs that would be difficult or even impossible using traditional drilling methods

As much as 90% of the land surface of the earth is covered with loose, unconsolidated material such as soil, clay, silt, sand, gravel and boulders (overburden), which varies in depth from a few centimeters to hundreds of meters.

Drilling through overburden is often problematic, due to the tendency of the earth to cave in behind the drill bit. This makes it difficult to retrieve the drill string and insert casing, after the hole has been drilled.

In practice, the bore hole is often lost before a casing tube can be inserted to support it.

The Symmetrix range of overburden drilling systems represents the latest technology in simultaneous casing advancement.

Symmetrix, was invented in Finland. Prior to SYMMETRIX, simultaneous casing advancement drilling was done with asymmetric drill bits which could easily be disabled by jamming of small rock fragments.

The new SYMMETRIX invention was a symmetrical drill bit system, which advances a casing pipe simultaneously when drilling the hole

Overview:


Symmetrix is a patented system comprised of an ingeniously simple concentric method of drilling through overburden with casing. Not only is it an all-around multipurpose concentric drilling system, it has opened the way for engineering consultants to utilize new construction methods that save contractors time and money.

Symmetrix can:

  1. Drill straight holes at any angle (including horizontal), in any type of ground condition, and to depths beyond 100 meters. (Synergy version is for vertical drilling)
  2. Drill holes from 3 inches (76 mm) up to 48 inches (1,220 mm) in diameter. (Synergy version is for 6 inch boreholes)
  3. Be used with DTH rigs or Top-Hammer rigs (Synergy is DTH)

Components:

  1. A pilot bit, with large internal flushing holes and external flushing grooves
  2. Symmetrical Ring Bit (reamer) with internal bayonet coupling
  3. Casing shoe for driving of the casing
  4. The Pilot Bit is attached to any common DTH hammer shank or top hammer rod thread.

Method

The casing shoe is welded to the casing. The pilot bit and ring bit are locked together by the bayonet coupling. Together they drill a hole large enough to allow the casing to be pulled into the hole. The pilot bit and ring bit rotate with the drill string while the casing shoe and casing do not rotate. After completing the hole, the pilot bit is unlocked by a slight reverse rotation of the drill string. The drill string and pilot bit are then retrieved through the casing.

Pros/Cons:

  1. Straight holes always without deviation due to changing ground formations
  2. Less torque required
  3. Simple fool-proof design
  4. Easy unlock - Easy relock
  5. Drilling at any angle
  6. Effective internal flushing
  7. Safe
  8. Economical
  9. Capital outlay