Drilling Rig MI8 for geothermal boreholes with casing drive system

The casing drive system, as seen in the video, is used when drilling with a hammer at the bottom of the hole and in inconsistent soil. Under such conditions the possibility that the borehole collapses is very high. The solution adopted so far is to use a double rotation head, one to drive the drill and one to guide the casing which is therefore positioned during the drilling. This solution is however very expensive both in terms of initial investment (two rotary heads instead of one), both in terms of drilling costs (greater fuel consumption), and in terms of maintenance (spare parts for two rotary heads, more powerful engines). etc.).

With the dragging system, instead, a single head is used for the rods and for the casing. The system is very simple and the advantages are really remarkable:
• The result is the same as that obtained with the double rotary head
• The rig is smaller and lighter
• Initial investment costs are significantly lower • Drilling costs are significantly reduced

POWER PACK
Maximum power 156 Hp (115 kW)

FUEL TANK
Capacity 150 liters (39.6 gal)

SLIDING:MAST stroke 900 mm (3 ft)

MAST: Max stroke of rotary head l 4.1 m (13 ft 6 ")
Max pull up and down: 12,000 daN (26,977 lbf)

ROTARY HEAD
Max torque 11,000 Nm (8,115 lbf • ft)
Max speed 130 Rpm

WINCH
Max line pull 3,100 daN (6,970 lbf)

DOUBLE HYDRAULIC CALMP
Model MS360: max passage diameter 360 mm (14 ")

CASING EXTRACTOR:
Maximum pull up force 25 tons

TILTING PIPES PACK

CASING DRIVE SYSTEM