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A09-093 111dd

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POSITIONING REPORT

FOR

TEIKOKU OIL (BONAPARTE GULF) CO., LIMITED

OF THE DRILLING RIG

RON TAPPMEYER

LOCATION KINGFISHER-I

BLOCK EP-57

DATE 17th - 20th MAY 1994

REPORTREF A2229

!Jf'PI 01 MINES & f'NF'R<;Y

111 ~~~~~~~~~~ml(m 111 P00723

CONTENTS

Location map

1.

2.

3.

4.

5.

6.

7.

8.

INTRODUCTION

SUMMARY 2.1 Requirements 2.2 Summary of Events

GEODETIC PARAMETERS

3.1 Datum 3.2 Projection 3.3 Datum Transformation

GLOBAL POSITIONING SYSTEM

4.1 System Description 4.2 Observations 4.3 Differential GPS (DGPS) 4.4 SkyFix Differential DGPS Link 4.5 Trimble 4000 DL GPS Receiver 4.6 Differential GPS Operation

FINAL DRILLSTEM POSITION

5.1 Final Differential GPS Position

GYRO CHECK

PERSONNEL AND EQUIPMENT

7 .l Personnel 7.2 Equipment

DISTRIBUTION

Page No.

4

5 5 6

7

7 7 7

9

9 11 12 13 15 15

16

16

18

19

19 20

21

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APPENDICES

A - RON TAPPMEYER OFFSET DIAGRAMS

B SYSTEMDATA

C - SKYFIX DGPS FINAL FIX RESULT

D - GYRO COMPASS CHECK OBSERVATIONS

E - SATELLITE AVAILABILITY PREDICTIONS

F - DAILY LOGS

129•30' E

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0 0 •

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Project: Positioning Report of the Drilling Rig Ron Tappmeyer Kingfisher-!

TEJKOKU OIL (BONAPARTE GULF) CO., LIMITED

1. INTRODUCTION

Page No.: 4 of 21

This report details the services provided by Racal Survey Australia Limited (Racal), during the positioning of the jack-up drilling rig Ron Tappmeyer at the Kingfisher- I location, Joseph Bonaparte Gulf, for Teikoku Oil (Bonaparte Gulf) Co., Limited (TOC).

The primary positioning was provided by Racal Survey's SkyFix Differential GPS, used in conjunction with Racal Survey's MultiFix Multiple DGPS Reference Station Software.

The Ron Tappmeyer was positioned over the Kingfisher- I location on the 19th of May 1994.

The co-ordinates of the proposed Kingfisher-llocation were provided by TOC as follows:

DatumAGD 66

Latitude Longitude

AMGZone52

Basting Northing

14° 46' 42.360" South 129° 06' 38.694" East

C.M. 129° East

511 918.50m 8 366 171.30m

All positioning operations were carried out on the Australian Geodetic Datum 1984. To convert AGD 66 grid co-ordinates to AGD84, a block shift was obtained from local Geodetic survey markers as supplied by the Department of Land Administration, Western Australia (DOLA). The values used were as follows:

From AGD 66 to AGD 84

Basting Northing

-2.3m -2.4m

Applying these values gives the following co-ordinates for the proposed Kingfisher-! location :

DatumAGD 84

Latitude Longitude

14° 46' 42.443" South 129° 06' 38.617" East

AMG Zone 52 C.M. 129° East

Basting Northing

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511 916.20m 8 366 168.90m

Revision: 1

Project: Positioning Report ofthe Drilling Rig Ron Tappmeyer Kingfisher-1


2. SUMMARY

2.1 REQUffiEMENTS

}>age No.: 5 of 21

Racal Survey Australia Limited were contracted by Teikoku Oil (Bonaparte Gulf) Co., Limited to provide personnel and positioning equipment consisting ofRacal's SkyFix differential GPS for the rig move ofthe Ron Tappmeyer onto the Kingfisher-! location. Racal's GNS software was used with the positioning system to provide online navigation of the rig.

The requirements were as follows:

(a) To provide real-time positioning for the jack-up drilling rig Ron Tappmeyer during the tow-in and onto the Kingfisher-! site.

(b) To provide a preliminary position, prior to the tow-master's decision to commence jack-up, pre-load and derrick skid-out operations.

(c) To derive a final differential GPS position after the Ron Tappmeyer had completed the pre-load and jackup.

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Project: Positioning Repott of the Drilling Rig Ron Tappmeyer Kingfisher-!


2.2 SUMMARY OF EVENTS

Page No.: 6 of 21

Racal personnel J. Tighe and S. Bradley departed Perth for Kununnurra at 0610 on 17th May 1994, arriving at 1055.

At 1155, Racal personnel and Client Representative D. Evans departed Kununnurra for the Ron Tappmeyer, arriving on board at 1230.

At the Client's request for the supply of positioning information as soon as possible, and as the Ron Tappmeyer had already commenced the run-in to location, the mobilisation of the survey equipment commenced immediately.

All survey equipment was set up by 1430. Precise positioning was not possible, however due to a problem with the differential GPS data link.

The towing vessel continued towards location using the vessel's GPS receiver for navigation as it was anticipated by the Racal personnel that the problems would be solved before arriving on location.

At 1745, as the differential data link was still inoperable, so the run in to location was aborted by the Client. The approach to the location was then delayed until daylight the following day.

Racal Survey Perth were contacted through Darwin Radio at 1900 regarding a request for the replacement equipment for the differential data link.

At 2400, all positioning equipment was operational and Racal Survey Perth were contacted at 0030 on the 18th May to cancel the previously ordered equipment.

The Ron Tappmeyer commenced the approach to location at 0700 on 18th May. At 1345, the Ron Tappmeyer was 1.6 miles from location when jacking down operations commenced. The bow leg was pinned at 1555. All three legs were pinned by 1715 with the rig within 25 metres oflocation.

Preliminary preloading was completed by 1810. At 1900, preloading was halted until daylight hours on 19th May. All preloading tests were complete by 1515 on the 19th of May. The rig was then jacked up, with the final fix commencing at 1954 and being completed at 2217.

At 2315, demobilisation of Racal equipment commenced. All equipment was packed by 0205 on 20th May 1994, and placed in a container for shipment to Darwin.

Racal personnel and D. Evans departed the Ron Tappmeyer for Kununurra at 1040, and then departed for Perth arriving at 2345.

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Page No.: 7 of 21


3. GEODETIC PARAMETERS

• Co-ordinates shown in this report refer to the following:

• The location co-ordinates were converted from Australia Geodetic Datum 1966 to Australian Geodetic Datum 1984 (AGD 84).

The Global Positioning System (GPS) is referenced to the World Geodetic System 1984 (WGS 84).

3.1 DATUMS

Datum Spheroid Semi-major Axis (a) Semi-minor Axis (b) Eccentricity Squared ( e2

)

Flattening ( 1/f)

Datum Spheroid Semi-major Axis (a) Semi-minor Axis (b) Eccentricity Squared ( e2

)

Flattening (1/f)

3.2 PROJECTION

Projection AMGZone Central Meridian (C.M.) Scale factor on the C.M. False Basting False Northing Latitude of Origin Unit of Measure

3.3 DATUM TRANSFORMATIONS

WGS 84 to AGD 84

Australian Geodetic Datum 1984/1966 Australian National 6 378 160.000m 6 356 774.719m 0.006 694 542 298.25

World Geodetic System 1984 WGS84 6 378 137.000m 6 356 752.3142m 0.006 694 380 298.257 223 563

Universal Transverse Mercator 52 129° East 0.9996

500 OOOm 10 000 OOOm 0° (Equator) International Metre

The following 7-parameter datum transformation was used to convert WGS 84 co-ordinates to AGD 84 coordinates:

Dx= Dy= Dz= Rx= Ry= Rz= Scale (K) =

+116.00m +50.47m -141.69m

+0.230" +0.390" +0.344" -0.0983

These values are from the paper "Transformation from WGS 84 to AGD 84 - an interim solution by M. Higgins, Department of Mapping and Surveying, Queensland. Also, these values were adopted by the InterGovernmental Advisory Committee on Surveying and Mapping Standards and Specifications for Control Surveys in July, 1990.

Document No.: a-report\2220-239\a2229.doc Revision: 1



AGD 66 to AGD 84

Page No.: 8 of 21

The following grid block shifts were used to convert AGD 66 co-ordinates to AGD 84 co-ordinates, based on Geodetic data in the surrounding area

Delta Basting -2.3m

Delta Northing -2.4m

In deriving the conversion from AGD 66 to AGD 84 the following survey marks were used:

Station AGD66 AGD84 ~66-84

NMF 273 448 678.08m 468 675.76m -2.32m 8 333 566.24m 8 333 563 .81m -2.43m

R095 401 247.53m 401 245.29m -2.24m 8 377 934.45m 8 377 931.98m -2.47m

Mean Basting -2.28m Mean Northing -2.45m

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