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Sim-Cas System

What is the Sim-Cas system?

The Sim-Cas continuous casing system was designed to overcome the problems of drilling in soft and loose ground
conditions where a stable cased hole was required. The Sim-Cas system achieves this by enabling the “down the hole” drill string and casing to be lowered simultaneously. A down the hole hammer is used to which is fitted a driver and a one-piece eccentric bit.

The Sim-Cas system can be used on all 3 shank designs: Halco, Mission, and I.R.

What are the advantages of the Sim-Cas system?

The Sim-Cas system has a 3-pin retention system with an eccentric bit to drill a larger diameter than the following casing. Because of the 2-piece design of the driver and eccentric bit, the system is easily retracted and redrawn from the casing and unlike some other systems which have difficulty retracting. The eccentric bit has heavy duty tungsten carbide wear gauge inserts to extend drill bit life. When the eccentric bit extends, the pilot bit centralizes the hammer to help drill straight holes. The large exhaust paths on the eccentric bit help remove drill bit cuttings.

On operating the Sim-Cas system when the eccentric bit extends, the design blanks off the access point of the retention pin on the driver. The Sim-Cas system can be used in any angle from the horizontal.

What is the “Shoe Drive”Sim-Cas system?

This system permits the casing to be hammered into the ground. This is achieved by a shoulder on the driver which impacts onto a shouldered casing shoe that is welded to the lead length of casing. With the shoe drive system, the use of a stabilizer is not required.

Sim-Cas Specifications

The Sim-Cas System Explained

Drawing #1 and Drawing #2 of Sim-Cas system
Drawing #3 and Drawing #4 of Sim-Cas system
 
1
Drilling into the ground, the eccentric bit rotates outwards to drill a larger diameter hole than the following casing.
 
2
After reaching the required cased depth the drill string is rotated in the opposite direction, the eccentric bit is then withdrawn into the casing.
 
3
This enables the entire drill string to be pulled out, leaving the casing situated in the bedrock.
 
4
Drilling can then be continued using a standard DTH button bit through the casing.