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A vertical "mother" hole is drilled to a depth of around 500-600 meter. In the next step a fan of "daughter" holes are drilled from the "mother" hole using directional drilling technology. Cores are then taken from each "daughter" hole. The contractor, Priority Drilling, was looking for faster ways of drilling straight "mother" holes in the water rich formation. Air hammers could not do the job. Wassara was the solution.

Result:

The Wassara Drilling system drilled 5-6 times faster compared to the conventional coring system which was previously used.
 

Equipment:

Hammer

Wassara W80

Bit

Wassara 49-22R0-095B55 + W-REX for casing advancement

Pump

WASP150D

Drilling fluid

Clean water

Drill pipe

Wassara 76x6.3x3000 mm

Rig

Fraste

Formation

Limestone, high water flow

Other

Wassara high pressure water swivel