Casing Advancement Systems (Overburden Drilling)

The casing advancement system operates by advancing the casing simultaneously with the drill bit during drilling, or by first driving or rotating the casing ahead of the bit before continuing drilling inside the casing. This method stabilizes the borehole and prevents collapse, sand inflow, or obstruction during drilling. It is particularly effective in loose formations, sand and gravel layers, and fractured or unstable ground conditions.

Our company currently offers two main series, which are eccentric casing systems and concentric casing systems.
    • Eccentric Casing System
      Eccentric Casing System

      Eccentric casing systems are specialized drilling tools used in complex ground conditions such as gravel layers, colluvial deposits, and running sand formations.

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      • Casing OD: 89-377mm
      • Casing min. ID: 77-347mm
      • Reaming diameter: 98-400mm
      • Casing shoe min. ID: 71-326mm
    • Concentric Casing System
      Concentric Casing System

      DTH drilling tools used together with concentric casing systems enable an integrated drilling mode in which drilling and casing advancement occur simultaneously.

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      • Casing OD: 114-508mm
      • Casing min. ID: 101-476mm
      • Max. wall thickness: 7-16mm
      • Reaming diameter: 120-520mm
One-Stop Drilling Solution

We are committed to providing efficient and reliable one-stop drilling solutions for clients in the mining, water well, geothermal, oil and gas, hydropower, and transportation infrastructure sectors.
One-Stop Drilling Solution

The rock drilling tools are compatible with handheld rock drills, drilling jumbos, surface rock drills, and rock drill and splitter commonly used in international engineering machinery.

Mining applications require high wear resistance and fracture toughness. Durable alloy spherical-button bits are commonly used, suitable for drilling hard rock and medium to large-diameter blast holes.

Tunnel drilling typically uses cross bits or small spherical-button bits paired with lightweight rock drills to improve maneuverability and excavation efficiency.

Surface mining blast-hole drilling commonly uses large-diameter spherical-button bits and extended threaded rods, paired with medium- or heavy-duty rock drills to ensure hole diameter and depth.

Small blasting operations typically use multi-sided rods and flat-edge ballistic button bits, suitable for handheld rock drills to quickly create shallow holes.