WEST AFRICAGETTING DP RIGS WORKING

OFFSHORE ANGOLA

IMCA SEMINAR ABERDEEN 5 NOVEMBER 2002

MATS ROSENGREN

OIM LEIV EIRIKSSON

ANGOLA HISTORY AND FORECAST

YEAR PRODUCTION EVENT

BARRELS/DAY

1968 FIRST OFFSHORE DISCOVERY

1996 700.000 FIRST DEEP WATER DISCOVERY

1999 720.000 FIRST DEEP WATER PRODUCTION

2002 920.000 FIRST ULTRA DEEP WATER DISCOVERY

2005 1.500.000

ANGOLA CONCESSIONS

DEEP WATER AND ULTRA DEEP WATER

OPERATORS

SONANGOL BLOCK 34

AGIP BLOCK 25

BHP BLOCK 21

BP BLOCK 18, 31

CHEVRONTEXACO BLOCK 14, 22

ESSO BLOCK 15, 24, 33

TOTALFINAELF BLOCK 17, 19, 32

DEEPEST WATER DEPTH 2020 METRES

BLOCK 31, AUGUST 2002

”LEIV EIRIKSSON” OCEAN RIG

LEIV EIRIKSSON

NEW RIG, FIRST WELL SPUDDED FEBRUARY 2002

ANGOLA, BLOCK 33 FOR ESSO

LEIV EIRIKSSON

WELL TESTING FIRST ULTRA DEEP WATER DISCOVERY

AUGUST 2002, ANGOLA, BLOCK 31 FOR BP

CHALLENGES

START-UP OPERATIONS

• EQUIPMENT: NEW RIG, NEW VERSIONS OF AUTOMATED

EQUIPMENT, SYSTEMS AND SOFTWARE

• PERSONNEL TRAINING: DEEP WATER OPERATIONS

COMPANY AND CLIENT PROCEDURES

SAFETY MANAGEMENT SYSTEM

NATIONAL CREW

OVERCOME LANGUAGE BARRIERS

DRILLING SYSTEMS

BULK AND FLUID SYSTEMS

• LOGISTICS: ONSHORE SUPPORT ORGANIZATION

SPARES, CONSUMABLES, SERVICES

LEIV EIRIKSSON

GENERAL DESCRIPTION

• DYNAMIC POSITIONING: CLASS 3

• LENGTH/WIDTH: 119 x 86 METRES

• DISPLACEMENT: 54.000 MT IN OPERATION

• VARIABLE DECK LOAD/PAYLOAD: 7.200/14.000 MT IN OPERATION

• MAX. OPERATIONAL WATER DEPTH: 2.500 METRES

LEIV EIRIKSSONPOWER PLANT – DISTRIBUTION - PROPULSION

• MAIN POWER PLANT: 6 DIESEL GENERATORS IN FOUR

SEPARATE ENGINE ROOMS

TOTAL 45.000 kW

• MAIN POWER DISTRIBUTION: 4 SWITCHBOARDS 11 kV IN FOUR

SEPARATE SWITCHBOARD ROOMS

• PROPULSION: 6 AZIMUTH THRUSTERS VARIABLE SPEED

5.500 kW EACH. TOTAL THRUSTER FORCE 600 TON

LEIV EIRIKSSON

POWER MANAGEMENT

ANGOLA - OFFSHORE ENVIRONMENT (FEB – OCT)

LEIV EIRIKSSON - POWER/FUEL CONSUMPTION

AVERAGE MAXIMUM

• WIND (KNOTS) 10 40

• SEA / SWELL (METRES) 1 4

• SURFACE CURRENT (KNOTS) 1 2

• POWER ( % OF AVAILABLE POWER) 10

• THRUST (% OF AVAILABLE THRUST) 5

• FUEL CONSUMPTION (M3/24HRS) 30

2 DIESEL GENERATORS RUNNING

LEIV EIRIKSSON

DP SYSTEM - GENERAL

• MAIN SYSTEM: SDP 32 (KS (KONGSBERG SIMRAD))

• BACK-UP SYSTEM: SDP 12 (KS))

• VESSEL CONTROL MONITORING

AND AUTOMATION SYSTEM: SVC (KS)

• REFERENCE SYSTEMS: 6 SEPARATE SYSTEMS

2 HIPAP ACOUSTIC (KS)

2 DGPS (SEATEX 200)

1 DGPS DUAL FREQUENCY (SEATEX 102)

1 DGPS DUAL PREQUENCY (FUGRO 2000)

LEIV EIRIKSSONHIGH PRECISION ACOUSTIC POSITIONING - HIPAP

MULTI USER LONG BASE LINE

AT 2000 METER WATER DEPTH, THE

TRANSPONDERS ARE DEPLOYED IN A

RADIUS OF 300 METERS FROM THE

INTENDED WELL POSITION

RIG AND ROV CAN BE POSITIONED

SIMULTANOUSLY USING THE SAME

SEABED DEPLOYED TRANSPONDER

ARRAY

THE ROV IS USED TO LOCATE THE

WELL POSITION WITH AN ACCURACY

WITHIN ONE METER

LEIV EIRIKSSONDIFFERENTAL GLOBAL POSITIONING SYSTEM – DGPS

4 SEPARATE SYSTEMS

• CONTROL ROOM MAIN DP - FORWARD

• CONTROL ROOM B-UP DP - AFT

AERIALS MOUNTED IN 3 DIFFERENT

LOCATIONS:

• TOP OF MAIN DP CONTROL ROOM - FWD

• DERRICK

• TOP OF B-UP DP CONTROL ROOM - AFT

• HIGH FLEXIBILITY

• HIGH REDUNDANCY

Spotbeam 2

Spotbeam 1

Aft Inmarsat

DERRICK

LEIV EIRIKSSONRISER MANAGEMENT SYSTEM – RMS 01

OPTIMUM POSITION

Indicates how far and

in what direction the

vessel should be moved

in order to minimise

flex-joint angles

SAFE AREAS

Circles that indicate

where the criteria for

the flex-joint angles are

fulfilled

LEIV EIRIKSSONRISER MANAGEMENT SYSTEM – RMS 02

LEIV EIRIKSSON

9 MONTHS OF OPERATIONS• VERY LITTLE DOWN TIME (NON-OPERATIONAL TIME) FOR BEING

A NEW RIG WITH MANY HIGHLY AUTOMATED DRILLING SYSTEMS

FIRST WELL 13.5%, FOURTH WELL 4% DOWN TIME

• AUTOMATED MUD MIXING/BULK TRANSFER SYSTEM CLOGGED

UP DUE TO PRODUCT HUMIDITY PROBLEMS. SYSTEM PARTLY

OPERATED MANUALLY TO OVERCOME PROBLEMS

• VERY EFFECTIVE PLANNED MAINTENANCE SYSTEM

IMPLEMENTED RESULTING IN ZERO DOWN TIME ON THE POWER

MANAGEMENT SYSTEM

• RIG OPERATED WITHIN DP CLASS 3 FULLY REDUNDANT WITH

ZERO DOWN TIME ON THE DP POSITIONING

Deep Water – Ultra Deep Water

OilGas OilGas

Gulf of Mexico

S.America

W. Africa

Asia Pacific

NW Europe

Mediterranean