ACTIVITIES

Deep Shafts (Blind shafts)

Brasfond recently introduced Brazil to a new drilling technology for Deep Shafts called Blind Shaft. This method, as opposed to the Raise Boring process, executes the widening of the pilot hole from the surface, i.e., from top to bottom, which eliminates the previous existence of a tunnel or gallery in the far lower portion, providing a significant time-to-delivery reduction.

GASTAU Project - Taubaté-Caraguatatuba Pipeline - São Paulo/ Brazil
Overview.

FAST AND SAFE, THE BLIND SHAFT REACHES DEPTHS GREATER THAN 2,630 FT AND DIAMETERS OF UP TO 315", WIDE IN A SINGLE PASS.

The use of the latest down-hole motors (Rotary Vertical Drilling System) for drilling the Pilot Hole provides the process with a unique capability to maintain the verticality of the hole, achieving results under 0.10% of vertical deviation.

The drilling of the Shaft using the reverse circulation process (air-lift) only uses water as a drilling fluid, which eliminates environmental damage since the material from the excavation can be used as an aggregate or even disposed of in locations near the worksite.

GASTAU Project - Taubaté-Caraguatatuba Pipeline - São Paulo/ Brazil
Excavation composition with special bits.

Learn more about the Deep Shafts

Specifications, construction sequences, case study.

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