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Drilling of 300-350 long horizontal holes in the coal mine at Ibbenbüren for the purpose of methane gas drainage. The owners of the mine, Deutsche Steinkohle, were looking for new and faster drilling technology to replace the traditional roller-cone method. With roller-cone the average penetration rate is 0,03 meter/minute. The roller-cone bit also needs replacement after every 10 to 30 meters. With Wassara W100 the average penetration rate is increased to 0,5 meters/minute with a bit life of 50 meters+. Pneumatic drilling can not be used due to the explosion risk.

Result:

With Wassara W100 the average penetration rate is increased with a factor of 17 and this is not taking into account the extra time needed to change worn out roller-cone bits. The resulting cost savings has convinced Deutsche Steinkohle that Wassara is the technology to go for.

Equipment:

Hammer

Wassara W100

Bit

Wassara 115 mm

Pump

Hauhinco 372 Lpm, 220 bar and 150 kW

Drilling fluid

Clean water, filtered to 50 micron

Drill pipe

1 meter, local design

Rig

Deilmann Haniel

Formation

Sandstone with high quartzite content, 180 MPa compressive strength