The Dual Rotary Drill can be used in many different applications.
- Rotary Drilling (open hole method). The rig can be used as a conventional top drive drill with the convenience of having a tilting top drive.
- Monitoring Wells. The ability to case a hole with minimum cross-contamination makes the dual rotary concept the most suitable method of drilling in environmentally sensitive areas.
- Construction Drilling. The drill has been used in the construction industry for drilling elevator shafts and piling holes in many types of formations. The lower drive systems guarantees a straight hole which is essential in this type of application.
- Dewatering. The rig has been used to drill dewatering wells in many large dam and mining projects where large quantities of boulders and excessive water-bearing formations were present
- Placer Sampling. Casing can be driven ahead of the drill bit and an uncontaminated sample can be taken. In this application, a special down hole tool is used to assist in driving the casing.
- Hollow Auger Drilling. The rig can be converted to an auger drilling unit by using the lower drive with its high torque rating and attaching an optional hollow joint auger adapter.
- Kelly Driving. The high torque of the lower drive can be used to rotate bits of up to one (1) 525 mm (60 in) diameter with a Kelly or top drive hoist using the reverse circulation method.
- Reverse Circulation Drilling: Using Reverse Circulation (RC) drillpipe. RC pipe is double-walled; The outer pipe is designed to withstand the torque and shock loads associated with rotary or percussion drilling, while the inner pipe is suspended within the outer pipe and is relatively unstressed during drilling.
Photo of the lower drive unit, showing the gripping jaws, with the upper drive unit in the background.
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