next generation deepwater drilling...
TRANSCRIPT
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New Generation Deepwater New Generation Deepwater Drilling RisersDrilling Risers
A Design MethodologyA Design Methodology
OwnerText BoxReturn to session directory
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September 29, 2004September 29, 2004 MTS DP ConferenceMTS DP Conference
IntroductionIntroduction
UltraUltra--deepwater, deepwater, 10,000 feet10,000 feet
1996 turning point1996 turning point Doubling water Doubling water
depth = depth = High Risk!!High Risk!! Existing Riser Existing Riser
Designs InadequateDesigns Inadequate What would the What would the
rigs look like?rigs look like?
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September 29, 2004September 29, 2004 MTS DP ConferenceMTS DP Conference
Previous Alternatives for Deepwater?Previous Alternatives for Deepwater?
Limiting the mud weight Limiting the mud weight requirement;requirement;
Running thickerRunning thicker--walled, walled, higher strength (main higher strength (main tube) risers in the high tube) risers in the high stress regions;stress regions;
Investigations into lighter Investigations into lighter weight aluminum riser weight aluminum riser designs;designs;
Investigations into Investigations into composite risers;composite risers;
Upgrading shallow water Upgrading shallow water coupling designs with coupling designs with deeper couplingsdeeper couplings--limited limited to about 5,000 ft w.d.to about 5,000 ft w.d.
Design and Construct a Design and Construct a New Generation New Generation Deepwater RiserDeepwater Riser
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September 29, 2004September 29, 2004 MTS DP ConferenceMTS DP Conference
Design ChallengesDesign Challenges
Manufacturing high strength connector Manufacturing high strength connector bolts;Bolt and thread capacity design bolts;Bolt and thread capacity design limits;limits;
Strength limitations of shallow water Strength limitations of shallow water connector designs connector designs
Careful consideration of riser pressure Careful consideration of riser pressure end load effects, PEL, on both auxiliary end load effects, PEL, on both auxiliary lines and main tube seals.lines and main tube seals.
Loop current and VIV effects on the Loop current and VIV effects on the riser;riser;
Hurricane abandonment strategies Hurricane abandonment strategies require emergency disconnect require emergency disconnect systems, riser hangsystems, riser hang--off and off and centralizing; centralizing;
Gas migration into the riser and Gas migration into the riser and deepwater well control issues require deepwater well control issues require gas handling equipment;gas handling equipment;
Riser mass limitations during running Riser mass limitations during running and outand out--ofof--phase heave acceleration of phase heave acceleration of vessel causing riser buckling after vessel causing riser buckling after disconnect;disconnect;
Lack of adequate riser buoyancy Lack of adequate riser buoyancy industry design standards;industry design standards;
Larger mud flow rate requirements Larger mud flow rate requirements because of higher pressure drops because of higher pressure drops across choke/kill auxiliary lines.across choke/kill auxiliary lines.
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September 29, 2004September 29, 2004 MTS DP ConferenceMTS DP Conference
Enabling TechnologiesEnabling Technologies
Improvements in dynamic positioning Improvements in dynamic positioning of ultra deepwater drilling vessels;of ultra deepwater drilling vessels;
Improvements in thruster electroImprovements in thruster electro--mechanical drives;mechanical drives;
Availability of shipyards to design and Availability of shipyards to design and build tanker hulls as drillships.build tanker hulls as drillships.
Improvements in mooring winch Improvements in mooring winch systems for ultrasystems for ultra-- deepwater;deepwater;
Availability of high tolerance wall Availability of high tolerance wall seamed pipe;seamed pipe;
More efficient riser design analysis More efficient riser design analysis programs and FEA tools;programs and FEA tools;
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September 29, 2004September 29, 2004 MTS DP ConferenceMTS DP Conference
Enabling TechnologiesEnabling Technologies The construction of a new riser The construction of a new riser
buoyancy plant in Houston;buoyancy plant in Houston;
Improvements in buoyancy Improvements in buoyancy manufacturing quality control;manufacturing quality control;
Improvements in fabrication of high Improvements in fabrication of high strength bolts for riser connectors;strength bolts for riser connectors;
Direct acting riser tensioner Direct acting riser tensioner technology;technology;
6060--inch rotary table development;inch rotary table development;
Riser gas handling technology;Riser gas handling technology;
Improvements in subsea control Improvements in subsea control system designs.system designs.
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September 29, 2004September 29, 2004 MTS DP ConferenceMTS DP Conference
Water Depth/Tension ChallengeWater Depth/Tension Challenge
1,600/Type D1,900/Type E2,000/Type E2,400/Type F3,500/Type H
1,2001,6001,8002,0002,700
1012131416
Indicated Tension (kips)/API Rating
TSR (kips)
Mud Weight (ppg)
10-Yr GoM Storm
WD = 10,000 ft
1,450/Type D1,650/Type E
8001,200
1216
Indicated Tension (kips)/API Rating
TSR (kips)
Mud Weight (ppg)
10-Yr GoM Storm
WD = 5,000 ft
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September 29, 2004September 29, 2004 MTS DP ConferenceMTS DP Conference
Riser ComponentsRiser Components
INTERMEDIATE FLEXJOINT
TENSIONER SUPPORT RING
TENSIONER
UPPER FLEXJOINT
DIVERTER
ROTARY TABLE
RISER SPIDER
RISER JOINTS
RISER BOOSTER LINE JOINT
LOWER FLEXJOINT
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September 29, 2004September 29, 2004 MTS DP ConferenceMTS DP Conference
Mud Weight vs. Water DepthMud Weight vs. Water DepthMUD WEIGHT vs WATER DEPTH
Estimated Maximum Riser Operating Limits
PPG/10,000 FT 14ANALYSIS POINT
PPG/7,500 FT 16ANALYSIS POINT
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2,000
4,000
6,000
8,000
10,000
12,000
14,000
13 14 15 16 17 18 19 20
MUD DENSITY, PPG
WA
TER
DEP
TH, F
T
10,000 FT BASE CASE 7500 FT 16 PPG REF CASE
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September 29, 2004September 29, 2004 MTS DP ConferenceMTS DP Conference
Riser SystemRiser System
Telescopic jointTelescopic joint Tension support ringTension support ring HiHi--Press, Lg. Dia. C/KPress, Lg. Dia. C/K Riser CentralizerRiser Centralizer Riser Specialty JointsRiser Specialty Joints Gas Handling JointGas Handling Joint Buoyancy Required?Buoyancy Required? Riser Disconnect!!!Riser Disconnect!!!
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September 29, 2004September 29, 2004 MTS DP ConferenceMTS DP Conference
Telescopic JointTelescopic Joint
Highly loaded jointHighly loaded joint 4 knot design current4 knot design current 100 kip shear at joint100 kip shear at joint 4,000,000 ft4,000,000 ft--lb bend.lb bend. Limiting angle of 8.5degLimiting angle of 8.5deg Centralizing requiredCentralizing required Protection for Aux. Protection for Aux.
LinesLines
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September 29, 2004September 29, 2004 MTS DP ConferenceMTS DP Conference
Riser CentralizerRiser Centralizer
Emergency DisconnectEmergency Disconnect DriftDrift--off or Driveoff or Drive--offoff Riser Slipjoint CapturedRiser Slipjoint Captured Design for 100 kip Design for 100 kip
lateral riser loadinglateral riser loading
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September 29, 2004September 29, 2004 MTS DP ConferenceMTS DP Conference
Gas HandlerGas Handler
Two AnnularsTwo Annulars Choke/Kill HosesChoke/Kill Hoses Control UmbilicalControl Umbilical
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September 29, 2004September 29, 2004 MTS DP ConferenceMTS DP Conference
Buoyancy DesignBuoyancy Design
Module StrengthModule Strength Module Depth RatingModule Depth Rating Module LengthModule Length
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September 29, 2004September 29, 2004 MTS DP ConferenceMTS DP Conference
Specialty JointsSpecialty Joints Intermediate flexjointIntermediate flexjoint Termination jointTermination joint
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September 29, 2004September 29, 2004 MTS DP ConferenceMTS DP Conference
Gas In RiserGas In Riser
Gas Handler at topGas Handler at top Safety issuesSafety issues Design impactDesign impact Weight impactWeight impact Cost impactCost impact Reduced riser collapse Reduced riser collapse
riskrisk
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September 29, 2004September 29, 2004 MTS DP ConferenceMTS DP Conference
DriftDrift--off Study Environmentsoff Study Environments
2.7 1.4 29.0 15.0 7.2 5.0 480001-year Winter Storm + 10 Yr Loop Current
0.7 0.4 35.5 18.3 7.1 4.6 380001-year Storm
1.2 0.6 42.7 22.0 8.2 5.8 2800010 year Winter Storm
ktsm/secktsm/secsecm
VelocityVelocity1 hour1 hourT meanHs
DPSIM CASE
SERIESEnvironment
Direction(s)
CurrentCurrentWindWindWave
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September 29, 2004September 29, 2004 MTS DP ConferenceMTS DP Conference
Riser Disconnect Time LimitsRiser Disconnect Time Limits15001500 Water DepthWater Depth-- DRIFT OFFDRIFT OFF1500 ft Water Depth,Riser Angles vs. Vessel Offset and Time
1YR STORM + 10YR LOOP CURRENT, DRIFT OFF
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
8.00
15 30 45 60 75 90 105 120 135 150
Vessel Offset (ft)
Ris
er A
ngle
s (d
eg)
0
30
60
90
120
150
180
Tim
e (s
ec)
Time
Flexjoint Angle
Slipjt Angle
Linear (Time)
Slipjoint Angle Trend
Low er Flesjoint Angle Trend
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September 29, 2004September 29, 2004 MTS DP ConferenceMTS DP Conference
Riser Disconnect Time LimitsRiser Disconnect Time Limits15001500 Water DepthWater Depth-- DRIVE OFFDRIVE OFF
1500 ft Water Depth, Riser Angles vs. Vessel Offset and Time1YR STORM + 10YR LOOP CURRENT
0.001.002.003.004.005.006.007.008.00
15 30 45 60 75 90 105 120 135 150
Vessel Offset (ft)
Ris
er A
ngle
s (d
eg)
0
30
60
90
120
150
180
Tim
e (s
ec)
TimeFlexjoint AngleSlipjt AngleLinear (Time)Slipjoint Angle TrendLow er Flesjoint Angle Trend
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September 29, 2004September 29, 2004 MTS DP ConferenceMTS DP Conference
Riser Disconnect Time LimitsRiser Disconnect Time Limits75007500 Water Depth Water Depth DRIFT OFFDRIFT OFF
7500 ft Water Depth, Riser Angles vs. Vessel Offset and Time1YR STORM + 10 YR LOOP CURRENT, DRIFT OFF
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
8.00
75 150 225 300 375 450 525 600 675 750
Vessel Offset (ft)
Ris
er A
ngle
s (d
eg)
0306090120150180210240270300330360
1 2 3 4 5 6 7 8 9 10
% Vessel Offset
Tim
e (s
ec)
Time
Flexjoint Angle
Slipjt Angle
Linear (Time)
Slipjoint Angle Trend
Low er Flesjoint Angle Trend
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September 29, 2004September 29, 2004 MTS DP ConferenceMTS DP Conference
ESD and DP Time LimitsESD and DP Time Limits
Wind Current TimeWater Depth
(ft) Hs Tmean 1 hour Velocity Maximumm sec kts kts Seconds
1500 5.0 7.2 29.0 2.7 135
1500 5.0 7.2 29.0 2.7 70
7500 5.0 7.2 29.0 2.7 360
Wave
1-year Storm+10 Yr Loop Current-Drift-off1-year Storm+10 Yr Loop Current--Drive-off1-year Storm+10 Yr Loop Current--Drift-off
Environment
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September 29, 2004September 29, 2004 MTS DP ConferenceMTS DP Conference
The Future Beyond 10,000 ft?The Future Beyond 10,000 ft?
Composite Riser Technology?Composite Riser Technology? Dual Gradient Drilling Technology?Dual Gradient Drilling Technology? Slim Bore Riser Drilling?Slim Bore Riser Drilling?
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September 29, 2004September 29, 2004 MTS DP ConferenceMTS DP Conference
It Does Happen!It Does Happen!Hurricane IvanHurricane Ivan--DP with RiserDP with Riser
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