Dual Rotary Drill
A Dual Rotary Drill Rig is a lower rotary drive that advances steel casing through unconsolidated overburden such as sand, gravel, glacial till and boulders. Rotational forces are transmitted to the casing via power-operated jaws. A carbide-studded shoe welded to the end of the first piece of casing enables the casing to cut through boulders, etc.
The DR-24 Dual Rotary rig can drill cased holes from 6 to 24 inches and can install 24 inch casing up to 500 feet in depth depending on soil conditions. The DR-24 has a wide range of applications, ranging from domestic and municipal wells, foundation piling projects, holes for hydraulic elevator jacks, and much more. The Dual Rotary Drilling Rig is mobile and allows us to work on a wide variety of drilling projects throughout British Columbia.
Rotating the casing in the ground by turning it creates a straight hole which minimizes sidewall friction, reduces stress on welds and casing joints and allows for greater casing depths.
The Dual Rotary Drilling method has been proven repeatedly when drilling in sand, gravel, glacial till, cobbles and boulders. Whereby conventional drilling techniques make it difficult to drill a cased hole, the versatility of DR-24 Dual Rotary Drilling Rig makes it one of the most efficient and cost effective methods for drilling holes in difficult formations.
Because the DR can drill without fluids, the ability to detect water in low flow formations is improved.
Control of Discharge
Cuttings are diverted through the discharge swivel and directed via a hose to a safe and convenient dumping and monitoring point. This is useful when drilling at homeowner sites or when cutting must be contained for environmental or safety reasons.
A & H uses Dual Rotary Drilling Rigs because they provide the most efficient and precise drilling method available today. Our DR-24 rig is the ideal flagship vehicle of our drilling equipment arsenal.