An introduction to borehole surveying
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Who need surveys anyway?
Run an electronic multi-shot survey tool
Without cables, batteries or computers
With its own QA system
Look at some survey results
Observe the effects of borehole deviation
Borehole Surveys
WHERE DID THAT DRILLHOLE GO?
slide 1
ENCORE
FLEXIT SmartTool Survey System
ENCORE
Borehole Surveys
ENCORE
Borehole Surveys
WHERE DID THAT DRILLHOLE GO?
Without surveys, you could lose your deposit
MINES & QUARRYS
Exploration; coring, RAB and RC
Orebody definition coring
Drill & Blast development
Production blasting
Raisebore pilots
DRILLING IS INFORMATION TECHNOLOGY, MAXIMISE IT WITH
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FLEXIT
Without surveys, the ground isn’t engineered
GROUND ENGINEERING
Site investigation
Grout curtains
Ground anchors
Compensation grouting
Drill & Blast tunnelling
DRILLING IS INFORMATION TECHNOLOGY, MAXIMISE IT WITH
slide 4
FLEXIT
Operating the FLEXIT MultiSmart
For a multi-shot drillhole survey, you need:The SmartTool
1
SensIT in hole probe
{NO film, batteries or cables }
2
StoreIT pocket data pad {NO stopwatch or notes
}
3
An office PC with the MeasureIT and DisplayIT software
Some Running Gear
3
Shock sub, pressure barrel & aluminium sinker bars
4
Wireline, rods, pipe or rope to run SensIT into the hole
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Drillsite Details
5
Hole reference and measurement depth
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SensIT in an AusMine running gear kit
Start the survey with the StoreIT data pad
1 Switch ON StoreIT
2 Use SETTINGS to enter:Hole reference number
Start station depth
(say, 250m)
Station depth interval (say, 6m)
Survey direction
(say, up)
3 Press DATA to confirm entries
5 SensIT is now taking a reading every 5 secs
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4 Press NEW to start SensIT, using the radio chip
Preparing SensIT for running into the hole
1 Place SensIT in the pressure barrel, supported by
the spring hanger
2 Lubricate O-rings. Tighten threads by hand
3 Tong up running gear threads
4 Run SensIT to survey start station depth; hold it still.
Spear-type landing collar
Totally sealed SensIT probe
Top sub assembly
Bottom sub with shock assembly
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3 x 1.5m aluminium spacer bars
Taking the first shot with StoreIT
1
Switch ON StoreIT
2
Screen will show
Depth 250 m
Press OK
depth)
Press & hold OK until StoreIT peeps.
Measuring
Wait ..5 secs
(counting down)
slide 9
3
(start
Taking the next shot with StoreIT
1 Wait until StoreIT peeps again
and screen shows
Depth 244 m(start
Press OK
depth-6m)
2 Move SensIT up 6m to the 244 m station
3 Press and hold OK until StoreIT peeps.
(counting down)
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Measuring
Wait ..5 secs
Continuing the survey with StoreIT
During a survey use SETTINGS to:
Change station depth
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Change station interval
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Redo or duplicate a station
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End the survey
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Start a new survey
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while SensIT is down the hole
Completing the survey with StoreIT
1 Use SETTINGS to:-
End Survey?
Press OK
2 Press and hold OK until StoreIT peeps.
3 Pull running gear out of the hole, remove
SensIT from pressure barrel & place
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within 10m of StoreIT.
Transfer data from SensIT to StoreIT
1
Use SETTINGS to:-
End Session?
Press OK
Press & hold OK until StoreIT peeps.
Downloading
Record No. #
(counting)
3
Wait until download is complete
4
Switch OFF StoreIT
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2
Download data from StoreIT to a PC
1 Connect TransIT aerial to your PC serial port
2 Switch ON StoreIT
4 The radio link and software do the rest!
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3 Run MeasureIT software; click Download
Quality Check system guarantees results
• Checks for tool movement
• Allows you to delete or adjust unreliable readings
• See the MagIC presentation
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• Checks for magnetic disturbance
How would you like to see the results?
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A tabulation for each station of up to 17 measurements.
Choose only the ones you want.
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A true plot of the hole in plan, E/W or N/S sections
Choose the scale, colours, marks, grid spacing
Any number of holes, collar extension on/off
Supplementary data plotted against hole path
Max/min hole separation
Exported to any other software
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slide 17
How would you like to see the results?
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How would you like to see the results?
Some typical readings from a “vertical” hole
Note:
Four degree change in dip over first 2 metres
Remainder of hole is relatively straight. Total
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error of 1.13 metres (6%) at 16 metres depth
Borehole interference in Civils projects
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Surveying will prove the integrity of
reinforcement programs
MeasureIT warns you when hole
separation exceeds set limits
It’s so simple with
FLEXIT
slide 20
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Six inclined grout holes are collared at 150 deg.
to allow for known RH deviation; see 2, 4 & 6.
Unfortunately 1, 3 & 5 hadn’t read the script!
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Displaying hole paths on a PC
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It’s so simple with
FLEXIT
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Keep in touch with product news at
<http://www.flexit.se>
Blast data
Ampang Quarry
Malaysia
Rock type
Granite
Bench height
18 m
Drill-hole diameter
Ø89 mm
Drill pattern
3x3 m2
Explosives
Emulite 150
5 kg/hole
ANFO
70 kg/hole
0.46 kg/bm3
Photo: S.O. Olofsson
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Powder factor
I’ve just run a MultiSmart so
I know where that drillhole went!
ENCORE
Borehole Surveys