Global Directional Drilling Services was contracted for the installation of a 280mm Polyethylene Enveloper with a 160mm Polyethylene water pipe inside the enveloper under the Dalby-Kogan Road. The bore was at a length of 160m and is to be used for the transportation of water to cool the new Darling Downs Power Station close to Dalby QLD. The list of conrtactors employed by Origin Energy to instal the water pipe were CH2MHILL, Christopher Contracting and Global Directional Drilling Services. Two APA gas mains where exposed to ensure the safe crossing underneath the lines. The ground conditions for the bore mainly consisted of shale and clay. Aqua-Clear was used to help break down the thickness of the drill fluid for easier pumping. The bore was completed in under a week with no incidents.
Global Directional Drilling Services was contracted for the installation of a 225mm gas main for Tenix Networks Pty Ltd. The length of the bore was 320m, with 290m drilled through rock/blue stone and 30m through clay. A return line was used to pump back fluid from the exit side to the recycler and back to the drill.
Global Directional Drilling Services was contracted by Tenix Networks Pty Ltd for the installation of a of a 200mm enveloper pipe to house a gas line. The drill shot was at a length of 400m through marine sand to coffee rock and sandstone. Due to unstable ground conditions at the start and finish of the bore we need to trail rods in case of bore hole collapse. Due to lack of access and environmental constraints a exit side recycle system was used to clean drilling fluid before it was pumped via a return line back to entry side recycler, which then fed the drilling rig with clean fluid. This practice saved water and the disruption of traffic was kept to a minimum. The project was completed with no incidents.