Recently Leighton Contractors on behalf of the Council and the North Shore Klas Valley Water Company to bear in ShannonCreek storage facilities, will be for the completion of Coffs Harbour in northern New South Wales, and Graf? Two towns to provide 30 billion liters (0.3 billion cubic meters) of water storage sites. 2050, the region’s population program development from the current 9 million to 22 million people.

Into the water An environment constitutes a natural dam formed by a steep wall. It is a major challenge for the project, because it is providing transport to the dam and power, and water from the dam’s natural barriers. Steep than the high pump 50 ~ 60m (164-197 feet), and therefore to pump water from the dam to increase the difficulties.

Leighton contractors understand the need to connect to services from the steep drilling pipes and the drilling contractor and professional contact UEA company to make the company as a sub-contractor to undertake the project. UEA has recently purchased a mighty company NAVIGATORD300x500 horizontal directional drilling? Australia’s first such large-scale rig.

Works including four straight holes, the length of each hole is about 330m, so that the services have been laying pipe connected to the steep slopes of the east. Borehole diameter of 110mm to place a telecommunications cable casing, two power cables diameter 140mm diameter 900mm casing and a main water pipes, all pipes are made of polyethylene pipe.

Due to environmental constraints, geological investigations carried out only in the canyon. In ShannonCreek around sandstone outcrops in the Sydney Basin and Hawkesbury sandstone found connected to the compressive strength between about 40 ~ 60Mpa.

Than expected hard The project seems mighty NAVIGATORD300x500 rig is suitable drilling rig can be fixed because of steep slopes, easily up into the 6% of the drilling angle. Need to use the DCI’s DigitrakEclipse-oriented tools to exit from the steep slope to guide the pilot hole.

In the drilling pilot hole and when the laying of small diameter pipe, UEA company recognized that formation conditions is much harder than originally thought. UEA company determined that the original plan to expand use of the pilot hole drilling diameter Reamer National Cheng Kung University may not be suitable, but rather an opening device. Stratigraphic drilling in which the hardness is estimated to reach 120MPa, need to use the device in the hole hard formations, while the main pipe diameter 900mm speaking, require a diameter of 1066mm the opening device.

Difficult work easier UEA director of the company, said Mr. KeithWhittaker, although hardness of rock, the mighty company’s rig deal with 1066mm of the opening device is very easy, and there is no pause in the whole project, not overload it is not uncommon.

Up as drilling is drilling, drilling can be naturally clean. This ruled out the demand for drilling mud, in this project only when the pilot hole drilling mud.

In the lower exit, use lots of recycled water to flush the hole of cuttings, and cuttings immersed in drilling fluid. The water through the drill pipe has been installed to supplement the power cable casing of recycled water, to provide adequate water. Although static load

water 90 tons, but in the course of construction, pipe laying is very easy to drag force back and did not exceed 10 tons.

Mighty D300x500 rig the scene can not imagine dealing with the harsh conditions so that UEA company can provide customers with a solution to overcome these challenges.
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