Getting technical at Snowy 2.0
What happened
Michels Trenchless executed multiple complex horizontal directional drills for Snowy 2.0 using custom‑designed rigs and engineered containment. One HDD ran 2,248m with an exceptional elevation differential and rigs were installed inside concrete pits to separate drilling fluids. This makes containment and bespoke rig capability operational realities to capture in RFQs and acceptance gates; watch whether follow‑on projects replicate this approach
Buyer takeaway
Treat custom rig builds and containment as verifiable supplier capabilities to score, not as assumed open‑hire availability
Cost / money
Directional: bespoke fabrication and engineered containment increase mobilisation and unit costs versus standard rental fleets because suppliers carry specialised capital
Supplier / commercial
Vendors offering bespoke rigs can demand scheduling priority and shorten quote validity since capacity substitution is limited
Safety / operations
Engineered pits and fluid controls materially reduce environmental risk; missing these controls in scope raises acceptance and compliance risk
What to watch
Require containment proof, waste‑handling plans and certified operators up front to avoid absorbing cleanup or remediation costs later
Key facts
- Multiple complex HDDs executed for Snowy 2.0
- One HDD length reported at 2,248m with a 563m elevation differential
- Rigs set up inside engineered concrete pits for drilling‑fluid separation
Source excerpts
In accordance with these rules, both rigs were set up inside large, engineered concrete pits to keep the drilling fluids separated from the ground
To address these concerns, the project team installed a valve-closed rotary diverter on the lower entry side to direct the return flow cuttings and drilling fluids to a concrete containment pit where they are directed to a fluid separation plant for treatment
The pilot hole intersect method was selected over a traditional one-rig pilot hole method for its unique advantages for the project, including fluid pressure management, reduced risk of inadvertent returns, and steerability through hard rock present at the park
