Geological Site Investigation
Drilling methods
Drilling methods
Typical (rotary) drill rig components
Drill bit (plus tools)is connected to a cable
Typical (rotary) drill rig components
Mast
Typical (rotary) drill rig components
Mast
Top drive or rotary table
Drill pipe/ rod
Drill bit
Mud /water pump
Mud pit (mud tank)
Dry drilling techniques
Bucket augers
Solid stem continuous augers
Hollow stem continuous augers
Cable tool drilling
Air rotary drilling
Wet drilling techniques
Rotary drilling usually with plain water or a bentonite-water slurry
-- forward circulation
-- reverse circulation
(jetting or wash boring)
Flushing fluids-- types and purposes
Air
Water
Bentonite-water slurry
Polymers
Chemically-based foams
Purposes of the flusching fluid /used additives
Transport rock cuttings out of the borehole
Cool the bit and tools
Lubricate the bit
Control mud density/ viscosity
Form a 'mudcake' (i.e. borehole wall sealing)
Reduce friction of drilling string
Reduce corrosion of equipment,...
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Lernkarten
Typical (rotary) drill rig components
Drill bit (plus tools)is connected to a cable
Typical (rotary) drill rig components
Mast
Typical (rotary) drill rig components
Mast
Top drive or rotary table
Drill pipe/ rod
Drill bit
Mud /water pump
Mud pit (mud tank)
Dry drilling techniques
Bucket augers
Solid stem continuous augers
Hollow stem continuous augers
Cable tool drilling
Air rotary drilling
Wet drilling techniques
Rotary drilling usually with plain water or a bentonite-water slurry
-- forward circulation
-- reverse circulation
(jetting or wash boring)
Flushing fluids-- types and purposes
Air
Water
Bentonite-water slurry
Polymers
Chemically-based foams
Purposes of the flusching fluid /used additives
Transport rock cuttings out of the borehole
Cool the bit and tools
Lubricate the bit
Control mud density/ viscosity
Form a 'mudcake' (i.e. borehole wall sealing)
Reduce friction of drilling string
Reduce corrosion of equipment,...
