Concentric Bit for DTH Water Drilling Projects Drilling Rig Tools

Product Description

The concentric/symmetrical drilling system represents an innovative integrated solution combining efficient drilling and casing stabilization, particularly effective in geologically complex or unstable formations. This technology employs a modular replaceable ring-shaped bit assembly that enhances drilling speed while maintaining precise borehole alignment. Its optimized integrated flushing channels and multi-stage casing shoe structure ensure efficient sealing of drilling fluid circulation while minimizing stress disturbances to surrounding strata.

This system demonstrates outstanding performance in shallow resource extraction and foundational engineering projects. Key applications include potable water well construction, mid-deep geothermal energy exploitation, high-rise building pile foundations, and hydraulic infrastructure impermeable walls. Notably, it excels in shallow boreholes up to 30 meters and consolidation grouting holes under 200mm diameter, significantly improving hole-forming quality and operational efficiency. The modular tooling system further enables rapid configuration changes to adapt

to varying geological conditions.

Technical Parameters

Operation Process

1 . Weld the trephine bit and casing shoe to the casing and lock it firmly on the pilot bit by tapping.

2 . The impact energy is transmitted through the pilot bit and the trephine bit, effectively breaking the rock and advancing the casing.

3 . After drilling and casing operations are completed, remove the drill string with the pilot bit by gentle counter-rotation and unlock the latch connection. The trephine bit remains in the hole and is only removed when retrieving the casing.

4 . Finally, continue drilling into the bedrock to the predetermined depth using traditional drilling techniques.

The advantages of this drilling system are its integrated design and efficient operating procedures, making it ideal for drilling in unstable formation conditions.

Machine Pictures