dual casing running for deep water spud in
TRANSCRIPT
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www.eni.it
Dual Casing Running
for deep water spud in
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Dual Casing Running for deep water spud in
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• Focusing the issue
• Deep water operation: Riserless top hole section
• Deep Water Dual Casing: MAIN PHASES
OPTIONS
REQUIRMENTS
• Applications
• Conclusions
Presentation
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Deep water activities:• extreme environment
• heavy load conditions with unconsolidated sea bed• high daily spread rate
The improvement of operations with the aim to increase the efficiency can produce a time
reduction and as consequence a
cost saving
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Conventional technique
• Drill 36” holeDrill 36” hole• Run and cement Run and cement
30” CP30” CP• Drill 26” holeDrill 26” hole• Run and cement Run and cement
20” csg20” csg
Jetting &Drill-Ahead
• Jet 30” CP and Jet 30” CP and
drill 26” holedrill 26” hole• Run and cementRun and cement
20”csg20”csg
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Traditional techniques – CONSTRAINS:
• uncertainty about the formation to cross
• perfect verticality of WH and correct stick up
not granted
Deep Water Dual Casing
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Conventional technique
• Drill 36” holeDrill 36” hole• Run and cementRun and cement
30” CP30” CP• Drill 26” holeDrill 26” hole• Run and cementRun and cement
20” csg20” csg
Deep WaterDual Casing
Jetting &Drill-Ahead
• Drill 23” x 36” Drill 23” x 36”
hole with HO in hole with HO in
tandemtandem• Run and Run and
cement 30” CP cement 30” CP
and 20” csgand 20” csg
• Jet 30” CP and Jet 30” CP and
drill 26”or 23”drill 26”or 23”• Run and cementRun and cement
20”csg20”csg
• 2 drilling phases2 drilling phases• 2 cementing jobs2 cementing jobs• 4 round trips4 round trips
• 1 jetting phase1 jetting phase• 1 drilling phase1 drilling phase• 1 cementing job1 cementing job• 2 round trips2 round trips
• 1 drilling phase1 drilling phase• 1 cementing job1 cementing job• 2 round trips2 round trips
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Drill23” or 17 1/2”
hole
No RotationNo Rotationby using straight by using straight
hole drilling device hole drilling device and motorand motor
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Start RotationStart Rotationforfor
42” or 36” Hole42” or 36” Hole
Drill23” or 17 1/2”
hole
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The hole inclination approximately 0° (zero degree)
Drill 23”or 17 1/2” hole+ 42” or 36” hole
With RotationWith Rotationforfor
36”/42” Hole36”/42” Hole
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End of
23” or 17-1/2” hole
+ 42” or 36” hole
POOH
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36” or 42” hole+
23” or 17 1/2” hole
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Ready to Run:
Combination
36” or 30” C.P. +
20” csg or
20”+13 3/8” Tapered csg
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Shown with mud mat & ball valve
MS 700 Wellhead Systems Guidelineless Type Drilling System without Guide structure
Hydrate Gas Seals
Low-pressure Housing Lowered into Mud Mat
Cement Port
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DA COMPLETARE
Inner string DP 5”
Casing 13 3/8”
Conductor pipe 30”
Casing 20”
36” Hole
Housing 30”
Housing 18” 3/4
Mud Mat
CART 18” 3/4
17 1/2” Hole
• Standard cementStandard cement• DeepCRETEDeepCRETE• Foam cementFoam cement
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Case History
ENI Angola
1 Job: 30”x20”x13 3/8” Casing
2 Jobs: 30”x20” Casing
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ANGOLA OFFSHORE – CASE HISTORY# 1: Standard cement
WD: 1300 m; Sea-bed temperature: 4 °CShallow water risk: no
Cement job: 30” C.P.x 20” x 13 3/8” tapered combined string
Lead slurry: 1.44sg (12ppg) LiteFIL Tail slurry: 1.90sg (15.9ppg)
Displacement: no cement returns at seabedWOC: 13 hrs Slack-off: casing string unstableWOC: additional 6 hrsSlack-off: OKTop job: cement job performed to ensure cement to sea bed
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ANGOLA OFFSHORE – CASE HISTORY
# 2: DeepCRETE Cement
WD: 500 m; Sea-bed temperature: 6 °CShallow water risk: yes
Cement job: 30” C.P. x 20” casingLead slurry: 1.20sg (10ppg) DeepCRETE with D500 GASBLOKTail slurry: 1.90sg (15.9ppg) with D500 GASBLOKDisplacement: returns at seabedWOC: 15 hrs Slack-off: casing string 1 cm “sink”WOC: additional 3 hrsSlack-off: OKTop job: no top job performed
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ANGOLA OFFSHORE – CASE HISTORY# 3: Foam Cement
WD: 1070 m; Sea-bed temperature: 5 °CShallow water risk: no
Cement job: 30” C.P. x 20” casing
Lead slurry: 1.25sg (10.4ppg) Foam cementTail slurry: 1.90sg (15.9ppg)Displacement: partial returns at seabedWOC: 15 hrs Slack-off: OKTop job: no top job performed
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Inner string DP 5”
Casing 13 3/8”
Conductor pipe 30”
Casing 20”
17 1/2” Hole
36” Hole
Housing 30”
Housing 18” 3/4
CART 18” 3/4
Mud Mat
Wellhead cut and retrieved Annulus 20” - 30”
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3 different options:
• M/U C.P. and surf. csg during flat time and hang up them on Moon Pool trolley
• M/U C.P. during flat time but surface casing on line after drilling tapered hole
• M/U C.P. and surf. csg on line after drilling tapered hole
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• VDL to load spud in materials
• Motion compensator capability
• Moon pool trolley capacity > (C.P.+surface csg+inner string) weight w/S.F.
• Distance moon pool – sea bed > lenght of surface casing
Requirements for full application:
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If all requirements are NOT fully satisfied:
Partial time saving but all other advantages are exploited:
• no C.P. sinking can occur
• housing pre-fixed stick up and verticality near to 0° is granted
• applicability in all lithology types
• latch between LP and HPWH Housing performed at surface, ensuring mechanical structural integrity
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Dual Activity rig:
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- Drill 8 ½” P.H.
- M/U 36” C.P.
- Run BOP
- Drill 23”x42” hole
- Run BOP
- Run Dual csg string
- Run BOP
- Cementing op.
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Operating time during riserless phase (drilling pilot hole and running BOP not included)
0
50
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Wells
Ho
urs
0
500
1000
1500
2000
2500
3000
Me
tre
s
Hours WD [m] Drilled interval [m]
Mean 108 hrs
Mean 57 hrs
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Deep water Dual Casing, a patented technology, is the most efficiency alternative to conventional techniques.
Advantages:• Hole inclination approximately
0 deg
• Reduction of risk assessment in
C.P. setting for unknown lithology
• No subsidence events
• Top Cement Job feasibility
• LP HSG and HP HSG latch
performed at surface
• Time reduction
Constrain:• Water depth longer than surface
casing setting depth (Reduction of
system efficiency)
• Rig technical characteristics
• If shallow hazard phenomena
imposes the use of 26” intermediate
casing (36” LP HSG & CP)