drillpilot: a new measurement while- drilling …trenchless technology roadshow may 28-29, 2014 –...

TRENCHLESS TECHNOLOGY ROADSHOW

May 28-29, 2014 – Scotiabank Convention Centre, Niagara Falls, ON

DRILLPILOT: A New Measurement While-drilling System

Harald KRENN

DRILL-PILOT - CONTENT

CONSTRUCTION – FUNCTION SET UP ON DRILL RIG FINISHED AND ACTUAL PROJECTS NEW DEVELOPMENT

FUNCTION How does the Drill-Pilot work?

Basically the Drill-Pilot is a simple inertial navigation system, similar to the navigation system in an airplane. It calculates it‘s position by integrating every movement along the three axes (via accelerometers) and every small rotation around the three axes (fibre optical gyros – FOG‘s) – this calculation is done 1.000 times per second. To stabilize the positions accuracy, the actual drilling depth is transmitted from the rig directly to the Drill-Pilot.

FUNCTION

The general accuracy of the position measurement is better than 0,5% of the measured length within predefined boundary conditions. One of these conditions is the calibration of the true north direction. Due to the fact the Drill-Pilot can find true north only with an accuracy of +5° it is necessary to use a calibration frame which has a exact known direction (measured by a surveyor). After longer measuring times (> 1 hour) the measurement should be refined either by a resurveying of the whole borehole or, during drilling, by using anchor points because the accuracy of azimuth angle degrades depending on the measuring time (gyro drift). The depth information from the drill rig is transmitted via cable in real time for a precise position calculation – therefore you get an real time position display.

INTERNAL CONSTRUCTION

GyroY

GyroX

Gyro

Z

Y

Triad

B-290

Z

X

Data Bus

Supply20...75 VDC

CPU Board

Power Bus

Receive

Send

RS 422

RS 422

Testinterface

Testinterface

Power Supply Board

Locking/Unlocking

Devicewith Relais and Motor

RechargeableBattery14,8V

Unlocking Command

Battery:- Estimated Capacity- Charging/Discharging- Status

Power DistributionPower FilteringSystem Connection

Test Interface

24V

Accel.µFORS-

36mµFORS-1

µFORS-1

BlackfinProcessor

Switch-Off Battery

End Switch“locked“

Supply Voltage Monitoring

Charger

On/Off

SwitchingPowerSupply

DC

DC

FilterBoard

withReverse Polarity

Protection

11V...16,8V

11V…24V

Poly-Fuse

Switching-Transistorfor Relais

Female

Connector

D-Sub

9-pole

Data ProcessingData Storage

Mechanization

UART Interface

Male

Connector

D-Sub

15-pole

Filter

Locking Status

DRILL-PILOT - ACCESSORIES

7

DRILL PILOT CAGE Diameter 139 mm (5 ½ inch)

CASING DM 114,3mm (4 ½ inch) with adapter for different types of drill rods

DRILL-PILOT - ACCESSORIES

8

NOTWENDIGE AUSRÜSTUNG AM BOHRGERÄT

DRILL-PILOT – SET UP ON RIG DRILL PILOT CABLE FEED THROUGH at ROTARY SWIVEL

MECHANICS TO MEASURE ROTARY SWIVEL SPEED

DEPTH METER

PRESSURE GAUGE FOR HYDRAULIC JACKS

9

DRILL PILOT CABLE FEED THROUGH at ROTARY SWIVEL

DRILL-PILOT – SET UP ON RIG

10

DRILL-PILOT – SET UP ON RIG MECHANICS TO MEASURE ROTARY SWIVEL SPEED

DRILL-PILOT – SET UP ON RIG DEPTH METER

DRILL-PILOT – SET UP ON RIG PRESSURE GAUGE FOR HYDRAULIC JACKS

13

DRILL-PILOT – SET UP ON RIG

PROJECTS

York University Toronto [CND] –130 horizontal drilling, up to 50m

SEC Toronto [CND] –Ground freezing holes and grouting boreholes, …

Resurveying of several small projects (Garmisch Partenkirchen [AUT], Brenner Basistunnel [AUT], U1/9 Vienna [AUT])

Gardiner Expressway [CND]– Horizontal directional drilling of 6 boreholes with 220m length

Spreetal [D] – horizontal directional drilled blast boreholes – 120 boreholes with length between 180m and 340m

Actual projects:

Resurveying / Steering of freezing- and grouting boreholes Copenhagen [DK] – Metro Trappen

Surveying of grouting boreholes in London [GBR] – Victoria Station Upgrade Project

GARDINER EXPRESSWAY

HORIZONTAL DIRECTIONAL DRILLING

SPREETAL HORIZONTAL DIRECTIONAL DRILLING OF BLAST BOREHOLES

MORE THAN 25.000m OF HORIZONTAL DIRECTIONAL DRILLED BOREHOLES IN TWO CAMPAIGNS

SPREETAL

SPREETAL

SPREETAL

NEW APPLICATION – SURVEYING DURING FLUSHING OF DRILL PILOT