Geological Site Investigation

Drilling methods

Drilling methods

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Set of flashcards Details

Flashcards	7
Language	English
Category	Nature Studies
Level	University
Created / Updated	07.01.2021 / 07.01.2021
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Typical (rotary) drill rig components

Keyboard commands:

= turn,

= for-/backward,

= scroll

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Drill bit (plus tools)is connected to a cable

Typical (rotary) drill rig components

Keyboard commands:

= turn,

= for-/backward,

= scroll

Mast

Typical (rotary) drill rig components

Keyboard commands:

= turn,

= for-/backward,

= scroll

Mast

Top drive or rotary table

Drill pipe/ rod

Drill bit

Mud /water pump

Mud pit (mud tank)

Dry drilling techniques

Keyboard commands:

= turn,

= for-/backward,

= scroll

Bucket augers

Solid stem continuous augers

Hollow stem continuous augers

Cable tool drilling

Air rotary drilling

Wet drilling techniques

Keyboard commands:

= turn,

= for-/backward,

= scroll

Rotary drilling usually with plain water or a bentonite-water slurry

-- forward circulation

-- reverse circulation

(jetting or wash boring)

Flushing fluids-- types and purposes

Keyboard commands:

= turn,

= for-/backward,

= scroll

Air

Water

Bentonite-water slurry

Polymers

Chemically-based foams

Purposes of the flusching fluid /used additives

Keyboard commands:

= turn,

= for-/backward,

= scroll

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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