Offshore Drilling Operations
Jeff Bugden
Canada-Newfoundland Offshore Petroleum Board
Outline
Project Management & Engineering
 Equipment and Systems
 Typical Offshore Drilling Program
 Operational Considerations

Atlantic Basins
TERRA NOVA FACILITIES
CONCEPTUAL LAYOUT
Source: Petro-Canada, 1997
Ice Bergs
Glory Holes
Glory Holes - Dredging
Terra Nova FPSO
HIBERNIA PRODUCTION SYSTEM
Drilling Installations
Nomenclature
Part 1 - Project Management &
Engineering Considerations
Drilling Installation
 Well Design
 Contracting and Procurement
 Casing, Cementing, Drilling Fluids

Drilling Installation
Power Requirements
(hoisting equipment, mud
pumps, rotary system)
Geological Prospect
(well depth, pressures)
Environmental Factors
(weather, ice, water
depth, station keeping)
Rated Drilling Depth
Drilling Installation
Regulatory Requirements
Well Control Equipment
Pipe Handling Eqpt
Solids Control
Conceptual Well Design
Geological Objectives
Evaluation Objectives
Formation Pressures
Well Design
Drilling Hazards
“Problem” Zones
Offset Well Data
Time Estimate
Cost Estimate
$$ BUDGET $$
Casing Program
Regulatory Requirements
Geological Objectives
Evaluation Objectives
Overpressure Zones
Casing Design
Testing Program
Fracture Pressures
Lost Circulation Zones
Detailed Design
(Burst, Collapse, Tensile, Wear, H2S)
Grade, Weight, Connectors, Setting Depth
Cementing Program
Regulatory Requirements
Temperatures
Fracture Pressures
Zone Isolation
Cementing
Lost Circulation Zones
Well Abandonment
Well Control
Detailed Design
Cement tops, recipes, slurry properties, additives,
displacement rates, centralization, equipment &
procedures
Drilling Fluids Program
Torque and Drag
Wellbore Stability
Formation Protection
Equipment Compatibility
Drilling Fluids
Formation Evaluation
Lost Circulation Zones
Well Control
Recommendations
Type, desired physical and chemical properties,
solids control requirements
Directional Drilling Program
Current Targets
Future Targets
Faults
Directional
Program
Formations
Dip
Torque and Drag
Recommendations
Type of Curve, KOP, BUR, DOR, BHA,
Directional Drilling Assembly, MWD Equipment
Bit Program
Lithology (well logs)
Compressive Strength
Stickiness
Bit Program
Abrasiveness
Offset Bit Records
Economics
Recommendations
Bit Types (Roller Cone or PDC), Hydraulics
(Nozzles), Motor/Turbine Drilling, WOB, RPM
PDC/Roller Cone Bits
Part 2 - Equipment & Systems
Circulating System
 Motion Compensation Equipment
 Drilling Assembly
 Hoisting System
 Well Control System

Motion Compensators
Marine Riser
Drilling Assembly
Drawworks
Crown Block
Top Drive
Drill Floor
Iron Roughneck
Mud Pumps
Drillers Cabin
Well Control System - BOP Stack
BOP Control System
Part 3 - Typical Drilling
Program
Assumptions:
Semisubmersible
Anchored
100 metre water depth
Typical Drilling Program




Position rig.
Run Anchors.
Pretension mooring lines.
Survey seafloor with ROV.
Typical Drilling Program




Run TGB.
Spud well.
Drill 36” (914mm) hole to
200 metres.
Run and cement 30”
(762mm) conductor pipe
with PGB and low pressure
wellhead housing.
Typical Drilling Program



Drill 26” (660mm) hole to
500 metres.
Run and cement 20”
(508mm) surface casing
with high pressure wellhead
housing.
Run BOP stack and marine
riser.
Typical Drilling Program



Drill 17 1/2” (445mm) hole
to 1,500 metres.
Run wireline logs.
Run and cement 13 3/8”
(340mm) casing.
Typical Drilling Program




Drill 12 1/4” (311mm) hole
to 3,000 metres.
Core any hydrocarbon
intervals
Run wireline logs.
Run and cement 9 5/8”
(244mm) casing.
Typical Drilling Program




Drill 8 1/2” (216mm) hole
to 3,500 metres.
Core any hydrocarbon
intervals
Run wireline logs.
Run and cement 7”
(178mm) liner (if well is to
be tested).
Part 4 - Operational Considerations

Heavy Weather
 Marine
Forecasts
 Operational Limits

Ice Bergs
 T-Time
 Ice
Management
Forecasts
Wind Speeds
 Waves
 Heave
 Pitch and Roll

MARINE WEATHER SITE FORECAST
Forecast for the Glomar Grand Banks at Hebron M-04 near 46 34 N 48 31 W issued by OCEANS Ltd., St. John's
Thursday
May 4 2000
at 0600 NDT , valid until 0930 NDT Saturday
with a long range forecast for the following 3 days.
WARNINGS IN EFFECT:
SYNOPSIS
NONE
A low pressure trough that passed the forecast waters last night will continue moving eastward into the North Atlantic this morning.
Following it, a ridge extending northward from a high centre currently near Sable Island will track eastward and pass through the
area this evening. Winds will diminish to variable light as the high centre nears and change to moderate southerlies behind it. A new
frontal trough developing over western Ontario is expected to work eastward across Newfoundland late Friday or early Saturday and
will pass through the site near noon on Saturday. Strong SSE to SSW winds will prevail over the forecast waters as this frontal
trough approaches. To the south, a weak wave will develop and move northeastward pushing an associated warm front towards the
area. Mist and fog are expected to develop late on Friday under these systems.
VALID DATE / TIME
DAY / DATE
THU
MAY 04
(NDT/UTC) 0930/12Z
TIME
THU
MAY 04
THU
MAY 04
FRI
MAY 05
FRI
MAY 05
FRI
MAY 05
FRI
MAY 05
SAT
MAY 06
SAT
MAY 06
1530/18Z
2130/00Z
0330/06Z
0930/12Z
1530/18Z
2130/00Z
0330/06Z
0930/12Z
310
VRBL
190
170
150
150
200
230
WIND DIRECTION (t)
WIND SPEED
10 METRE MEAN (kt)
330
11
9
5
11
12
15
15
15
13
Anemometer MEAN (kt)
14
11
7
13
14
22
23
22
20
Anemometer MAX (kt)
WIND WAVES
SIG HEIGHT (m)
20
17
13
19
20
28
28
28
26
1.0
4
0.3
2
0.5
3
0.6
3
0.9
3
1.2
4
1.0
4
1.0
4
1.2
4
PERIOD (s)
PRIMARY / SECONDARY SWELL
DIRECTION (true) 240/270
240/270
340/240
340/300
330/290
320/290
310
310/150
150/200
1.5/1.2
1.5/1.2
2.0/1.0
1.8/1.2
1.5/1.2
1.5/0.8
1.3
1.0/1.0
1.0/1.0
PERIOD (s)
8/7
8/7
9/7
9/8
8/8
8/8
8
7/7
7/7
COMBINED SEA
SIG HEIGHT (m)
2.3
2.2
2.3
2.2
2.0
1.9
1.8
1.7
1.7
MAX HEIGHT (m)
4.0
3.5
4.0
4.0
3.5
3.0
3.0
3.0
3.0
HEIGHT (m)
2
2
1
1
2
4
5
4
4
PRESSURE (mb)
1030
1031
1031
1030
1028
1024
1018
1016
1014
FREEZING SPRAY
NIL
NIL
NIL
NIL
NIL
NIL
NIL
TEMPERATURE (C)
SKY COVER
SCT/BKN
SCT/BKN
FEW/SCT
FEW/SCT
SCT/BKN
WEATHER
NIL
NIL
NIL
NIL
NIL
OCNL
MIST
VRBL
MIST
VISIBILITY (nm)
6+
6+
6+
6+
6+
6+
OCNL
2-5
6+
VRBL
1-5
LONG RANGE FORECAST
SAT MAY 06
VALID DAY / DATE
BKN/OVC BKN/OVC
NIL
NIL
OVC
OCNL
OBSC
MIST
OCNL ROCNL F
1-5
OCNL
1/4 - 1/2
OVC
OCNL
OBSC
MIST
OCNL ROCNL F
1-5
OCNL
1/4 - 1/2
SUN MAY 07
SUN MAY 07
MON MAY 08
MON MAY 08
PM
AM
PM
AM
PM
AM
WIND DIRECTION (t)
W - SW BCMG NLY
N TO NE
NE
NLY
N TO NW
NW TO SW
10 m WIND SPEED (kt)
10 - 15
1.5 - 2.0
10 - 20
1.5 - 2.5
10 - 20
2.0 - 2.5
20 - 30
2.5 - 3.5
15 -25
2.0 - 3.0
10- 25
1.5 - 2.5
BCMG GOOD
GOOD OCNL FAIR
FAIR OCNL POOR
BCMG GOOD
GOOD
GOOD
VALID PERIOD
COMB WAVE HGT(m)
VISIB ILITY
TUE MAY 09
Next Regular Forecast issued: 1800 NDT TODAY
Prepared by: AO.
Forecast number J B 040500 . 06
Phone: (709) 753 2482 / (709) 753 5788; Fax: (709) 753 5972 / (709) 753 5211 (from offshore); Email: weatheroffice@oceans.nf.net
Wind Speeds
10m Flag
48 HOUR FORECAST WIND SPEEDS
STORM
GALE
80
Max Wind
Anemo
70
10m Wind
60
SPEED (KTS)
50
40
30
20
10
0
0930/12Z
THU
MAY 04
1530/18Z
THU
MAY 04
2130/00Z
THU
MAY 04
0330/06Z
FRI
MAY 05
0930/12Z
FRI
MAY 05
1530/18Z
FRI
MAY 05
2130/00Z
FRI
MAY 05
0330/06Z
SAT
MAY 06
0930/12Z
SAT
MAY 06
Heave
SPECTRAL HEAVE PREDICTION FOR DAYS 1 AND 2;
LINEAR REGRESSION HEAVE FORECAST FOR DAYS 3, 4, & 5
at Standard Operating Draft; Rig heading 290 oT
6
Maximum Predicted Heave
Forecast Heave
Minimum Predicted heave
5.5
5
4.5
HEAVE (m )
4
3.5
3
2.5
2
1.5
1
0.5
0
0930/12Z
THU
MAY 04
2130/00Z
THU
0930/12Z
FRI
2130/00Z
FRI
0930/12Z
SAT
2130/00Z
SAT
Date / Tim e
0930/12Z
SUN
2130/00Z
SUN
0930/12Z
MON
2130/00Z
MON
0930/12Z
TUE
Jeanne d’Arc Basin Operations - Floating Operations Manual
Safe Operational
Limits
Drilling/Tripping
Total
Heave
m
5.0
Pitch & Roll
Single Amplitude
deg,
5.0
Offset Ball
Joint Angle
deg.
4.0
Casing/Cementing
3.0
4.0
3.0
Running BOP
1.5
2.0
N/A
Hang-Off
5.0
5.0
4.0
Disconnect Riser
6.0
N/A
8.0
Logging
4.0
N/A
4.0
Well Testing
3.0
4.0
3.0
Survival Condition
including 1/3 anchor chain
tension
Evacuation when
De-ballast to survival draft of 17m to increase air
gap
OPERATION
90% of vessels design criteria is expected to be
reached
T-Time
Ice Management
Concluding Comments
THE END