In Biotope, the drilling crew completed a 530 m long HDD crossing underneath a busy main road. Navigating through limestone, marl, and claystone, three heavy-duty HDPE pressure pipes (2 x 315 mm, 1 x 280 mm, SDR 7.4) were installed at a True Vertical Depth (TVD) of 33.6 m and across an elevation difference of 27 m.
Technical Specifications
- Drill Length: 530 m
- Rig: Vermeer D220x500, PD 150/65+
- High-Pressure Mud Pump: 1,300 l/min / 1,600 l/min
- Pilot Hole: 6 ¾” Mud Motor, 9 7/8″ TCI Roller Cone Bit
- Guidance / Steering System: Paratrack II + PWD (Pressure While Drilling)
- Crossing Obstacle: Main Road
- Reaming Steps: 16″ and 22″ TCI Rock Reamers
Bore Profile:
- Entry Angle: 15°
- Exit Angle: 12°
- Vertical Bend Radius: 300 m
- True Vertical Depth (TVD): 33.6 m
- Elevation Change: 27 m; 140 m dry-bore section
Geological Conditions & Pipe Specifications:
- Geology: Limestone, marl, claystone
- Product Conduits: 2 x HDPE 315 mm, SDR 7.4; 1 x HDPE 280 mm, SDR 7.4
- Drilling Fluid: Bentonite-based
Final Pullback Force:
- 315 mm – 85 kN
- 315 mm – 162 kN
- 280 mm – 65 kN
