Steerable wireline core barrel

DeviDrill

The DeviDrill system is a Directional Core Drilling (DCD) barrel. This unique core barrel produces a 3m/10ft AQTK core sample while simultaneously guiding the borehole to target. This ensures there is no loss of geological information while steering. Testing of the boreholes trajectory and orientation of the DeviDrill system is completed while retrieving core samples.

3200 mm / 126 in

75.7 mm
3 in

57 kg
125.7 lbs

Core diameter:
31.5 mm / 1.24”

Typical dogleg severity (DLS):
5-9º/30 m /
5-9º/100 ft

RPM:
300-1200

Typical
penetration rate:
3 m/h / 10 ft/h

*Calibrated for temperature range -10C to +60C

Total weight

57kg/125lbs

Total length

4.5m/14.5ft

Bit diameter

NWL

Reamer diameter

NWL

Tool body diameter

72.0mm/2.83”

Hole diameter

75.7mm/3”

Core diameter

31.5mm/1.24"

Core length

3m/10ft

Instrument barrel length

20cm/8″

Instrument barrel diameter

51mm/2.01”

Pumping/latching unit

Longyear NQ™

Landing ring

Longyear NQ™

Landing indication

Yes

Core block indication

Yes

Pull out by-pass valve

Yes

Use of additives

Optional

Typical dogleg severity (DLS)

5-9°/30m / 5-9°/100ft

Operating flow

30-50l/min / 8-13gal/min

Operating pressure

20 bar + circulation pressure

Feeding force (max)

4500kg/9900lbs

RPM

300-1200

Recommended parameters

Dogleg severity, NQ™ rods

9º pr. 30m/ 9º pr. 100ft (180m/590ft radius)

RPM

300 – 800

Feeding force (Bit weight + sliding force)

1500 – 2500 kg

Typical penetration rate

3 m/h/10 ft/h

Typical production rate

9 – 27m/12h/30 – 90ft/12h (50% – 75% of conventional wireline drilling)

The DeviDrill fits directly to the standard drill string and is fully compatible with the N-size wireline system. There is no need for additional water pumps, drill strings, or survey instruments. Devico’s survey tools are a fully integrated part of the tool, as they stay on board and measure while drilling (MWD).

Coring while steering provides a complete record of the geology. It leaves nothing in the hole – except a curve. The curvature or dogleg can be adjusted from zero to more than 20 deg/30 meters but is typically aimed at 9 deg/30 meters, which is the recommended curvature from most drill rod manufacturers.