Artboard 1Artboard 1Checkmarkclose-chubbyCombined ShapeexpandExternal-LinkUntitled-3gridlkab-breadcrumb-startinfoUntitled-1listplay-linkplay-sololkab-printikon-sök-lkabTwitterYouTube


Project Description:

LKAB uses Wassara Drilling System for raise drilling of 20 - 50 meter long shafts/openings in the iron ore mine at Kiruna. First a 254 mm pilot hole is drilled with a stabilized Wassara W150. The pilot is then reamed to 680 mm with a cluster consisting of two Wassara W150 hammers. An advantage with using the Wassara system is that fractured formations are easily drilled.

 
Result:

LKAB drills between 1500 meter and 2000 meter raise with the Wassara system each year. The average rate of penetration when drilling the pilot is 10 meter/hour and when reaming it is between 2 and 4 meters/hour.
 

Equipment:

Hammer

Wassara W150

 

Bit

Wassara 204 mm,  pilot with Wassara 254 mm

 

Pump

2  Prattisoli, each pump  gives  360 liter/min vid 150 bar

 

Drilling fluid

Clean water,

 

Drill pipe

Wassara 1500 mm, Ø 160 mm

 

Rig

Rebuilt Atlas Simba 269

 

Formation

Iron ore and granite