exploration drilling - estonia...2019/05/17 · massenza drilling rigs - the auger spirals convey...
TRANSCRIPT
Drilling methods and technical solutions
M I N E R A L E X P LO R AT I O N :
A presentation by Silvia Azzoni
Massenza Drilling Rigs
DRILLING METHODSS E V E R A L S O L U T I O N S - O N E G OA L
Massenza Drilling Rigs - www.massenzarigs.com
Core DrillingReverse
Circulation
Drilling
Hollow Stem
Auger Drilling
Massenza Drilling Rigs - www.massenzarigs.com
The auger spirals convey the unconsolidated formations
to the surface, typically with no drilling fluids. Once the
bore hole reaches the desired depth, the hollow stem acts
as a temporary casing, keeping the sides of the bore hole
from caving in. The driller can take samples through the
hollow stem.
D R I L L I N G M E T H O D
• Uncontaminated sampling in unconsolidated soils
• Rapid drilling into clay-filled soils
• Easy and cost-effective
A DVA N TA G E S
• Not effective with boulders, large cobble stones and in loose, sandy soils
• Depth is limited to 45 meters or less
D I S A DVA N TA G E S
HOLLOW STEM AUGER DRILLING
Desired features
R OTA R Y H E A D
High torque,
to be calculated considering the desired
diameter and depth of the borehole
AU G E R J O I N T
Special joint,
to prevent damages to the head caused by
the turning force of the auger
Massenza Drilling Rigs - www.massenzarigs.com
Massenza Drilling Rigs - www.massenzarigs.com
The air and cuttings are forced across the face of the bit
and back up inside of the “inner tube” of special dual wall
drill pipes, up to the surface. They then pass through the
rotary head via a deflector elbow and along a discharge
hose to the cyclone. The cyclone slows the sample,
separates it from the air and collects it.
D R I L L I N G M E T H O D
• No cross contamination from other areas of the hole
• Unconsolidated formations without casing
• Good performances also in hard rock
A DVA N TA G E S
• Inaccurate samples
• Moderate depths (up to 300 m)
D I S A DVA N TA G E S
REVERSE CIRCULATION DRILLING
Desired features
R C K I T
Swivel head positioned under the rotary
head, connected to a cuttings deviator
and a cyclone , for separation and sample
collection
A I R C O M P R E S S O R
Hydraulic powered by the rig. With high
flow to start the circulation system
Massenza Drilling Rigs - www.massenzarigs.com
Massenza Drilling Rigs - www.massenzarigs.com
It uses a rapidly rotating drill bit, which is kept
cool and lubricate by water and drilling fluids.
As the drill rods advance, the cylinder of
remaining rock gradually is enveloped by the
pipes.
D R I L L I N G M E T H O D
• Very accurate samples
• Capable of drilling holes at great depths
A DVA N TA G E S
• Costs are quite high
• Slow operations for recovery the carrot
D I S A DVA N TA G E S
CONVENTIONAL CORE DRILLING
Massenza Drilling Rigs - www.massenzarigs.com
The core barrel can be removed from the bottom of the hole
without removing the drill string assembly, just by using an
overshot lowered at the end of the wireline and attached to the
back of the core barrel inner tube. Then the wireline is pulled
back and the inner tube disengages itself from the barrel.
D R I L L I N G M E T H O D
• Very accurate samples
• Capable of drilling holes at great depths
• Very fast operations
A DVA N TA G E S
• Costs are quite high
D I S A DVA N TA G E S
WIRELINE CORE DRILLING
Massenza Drilling Rigs - www.massenzarigs.com
Desired features
R OTA R Y H E A D
High rotation speed ,
typically from 300 to 1400 rpm, rpm
depending on the diameter and rods
W I R E L I N E W I N C H & T R I P L E X P U M P
Wireline winch with long cable and fast
descent and triplex mud pump with high
pressure to cool the bit
Massenza Drilling Rigs - www.massenzarigs.com
MASSENZA IN ESTONIAI N T RO D U CI NG T H E M I 8 O FO Ü I N S E N E R IBÜ ROO S T E I G E R
A multipurpose and highly customized drilling rig, suitable for water wells,
mineral researches and geotechnical applications, able to drill:
Main features:
Deovers: Marketing 2020Massenza Drilling Rigs - www.massenzarigs.com
• HP 107 (79 kW) diesel engine
• 12000 kg pull up and down
• Winch wireline with 1000 m of cable
• 8 speeds multi-purpose rotary head (10660 Nm - 1000 RPM)
• Triplex water pump (200 l/min - 50 bar)
• 45° inclined wireline coring up to 1000 m with NQ rods
• with continuous flight augers
• water wells with DTH hammer and reverse-circulation system
1 0 0 % C O R E R E C OV E R Y
With MASSENZA MI8 drilling rig and
triple barrel PQ3 wireline method.
Same drill site and rock formation.
6 0 % C O R E R E C OV E R Y
With other brand drilling rig and
single barrel method.
Same drill site and rock formation.
Via Emilia 58/E/F, Parola 43036 (PR)
Italy
A D D R E S S
+39 0521 82 52 84
+39 339 644 80 72
P H O N E
E M A I L
CONTACT USW E ' R E A LWAY S L I S T EN I N G
MASSENZA DRILLING RIGSwww.massenzarigs.com