Drilling through loose, loose materials such as soil, clay, silt, sand, gravel, and boulders is known as overburden, which is often problematic because the earth tends to collapse behind the drill. The symmetric casing drilling system is drilling in the rock stratum containing the Ellipse and the crack, and it represents the latest technology of the casing drilling system.

Our concentric overburden drilling system is designed to drill multiple sizes at any angle (including horizontal plane) and at any depth (over 100 m) simultaneously with the casing in unconsolidated formations, range from 108 mm to 863 mm (4 1/4 to 34 inches) .

The internal flush tank, together with the built-in casing shoe, seals the drill button well to minimize damage around the hole. It makes casing easy to track, equipment and operation simple, suitable for micro-piling, underpinning, anchoring, offshore operations and horizontal drilling and other applications.

☑ Stable and reliable working performance
☑ Full face head design for faster penetration and straighter hole
☑ Less torque is required than eccentric drilling
☑ Can drill in vertical, horizontal or any direction
☑ Minimize disruption to the drilled hole
☑ Effective cuttings removal
☑ Unlocking-relocking easily
☑ Easy to operate and system security
☑ Varied ring bit diameters to suit different casing requirement
☑ The less vibration of drill rig