rigless – cutting the cost of well abandonments innes perenco.pdf · rigless – cutting the cost...
TRANSCRIPT
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SPE 4th European Well Abandonment Seminar
Rigless – Cutting the Cost of Well Abandonments
Date: Thursday 18th April 2013
Richard Innes, Decommissioning Engineer
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Rigless – Cutting the Cost of Well Abandonment
• Objective
• What Does “Rigless” Mean
• Basic Requirements
• Case Study
• Comparisons
• Conclusions
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Rigless – Cutting the Cost of Well Abandonment
Objective
• Permanently Abandon the well safely (in compliance with O&GUK guidelines)
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What Does “Rigless” Mean
Rigless – Cutting the Cost of Well Abandonment
![Page 5: Rigless – Cutting the Cost of Well Abandonments Innes Perenco.pdf · Rigless – Cutting the Cost of Well Abandonment Phase III, Remove tree and top of tubing 0 Seabed 1000 Triassic](https://reader034.vdocuments.us/reader034/viewer/2022043001/5f7c4ec7a4dd965dcd022f0c/html5/thumbnails/5.jpg)
“Rigless” ?
Do you need
to pay for
this?
Rigless – Cutting the Cost of Well Abandonment
![Page 6: Rigless – Cutting the Cost of Well Abandonments Innes Perenco.pdf · Rigless – Cutting the Cost of Well Abandonment Phase III, Remove tree and top of tubing 0 Seabed 1000 Triassic](https://reader034.vdocuments.us/reader034/viewer/2022043001/5f7c4ec7a4dd965dcd022f0c/html5/thumbnails/6.jpg)
“Rigless” ?
When you
can just use
this?
Rigless – Cutting the Cost of Well Abandonment
![Page 7: Rigless – Cutting the Cost of Well Abandonments Innes Perenco.pdf · Rigless – Cutting the Cost of Well Abandonment Phase III, Remove tree and top of tubing 0 Seabed 1000 Triassic](https://reader034.vdocuments.us/reader034/viewer/2022043001/5f7c4ec7a4dd965dcd022f0c/html5/thumbnails/7.jpg)
Rigless – Cutting the Cost of Well Abandonment
• Only mobilise what you need • Where possible use existing structure/deck • Use existing well tubulars for conveying barriers (cement) • Create a tailored spread suitable for platform and job • Tubular removal, use Jacks, cut into sections to meet crane capacity
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Rigless – Cutting the Cost of Well Abandonment
Basic Requirements
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Rigless – Cutting the Cost of Well Abandonment
• Suitable wells • 400+ sq m of available deck space (load capacity ?) • 10+ tonne crane • Crew changing (helideck or walk to work) • Standby vessel • Flushed liquid disposal • Multi-well campaign
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Rigless – Cutting the Cost of Well Abandonment
Phases
I. Preparation II. Place barriers III. Remove tree and top of tubing IV. a) Cut conductor and casings b) Remove steel to 10’ below sea bed
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Rigless – Cutting the Cost of Well Abandonment
Phase II, Typical Suitable well
0 Seabed
1000 Triassic
2000
Upr Bunter shale3000
Bunter Sand
4000Lwr Bunter Shale
5000Zechstein
Legend
6000
Leman
7000
LimestoneSandstoneShale
AnhydriteClaystoneDolomiteHalite
gasProductionZone
SSSV nipple
Packer
![Page 12: Rigless – Cutting the Cost of Well Abandonments Innes Perenco.pdf · Rigless – Cutting the Cost of Well Abandonment Phase III, Remove tree and top of tubing 0 Seabed 1000 Triassic](https://reader034.vdocuments.us/reader034/viewer/2022043001/5f7c4ec7a4dd965dcd022f0c/html5/thumbnails/12.jpg)
Rigless – Cutting the Cost of Well Abandonment
Phase II, Placing barriers 1
0 Seabed
1000 Triassic
2000
Upr Bunter shale3000
Bunter Sand
4000Lwr Bunter Shale
5000Zechstein
Legend
6000
Leman
7000
LimestoneSandstoneShale
AnhydriteClaystoneDolomiteHalite
gasProductionZone
SSSV nipple
Packer
INSTALLBRIDGE PLUG
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Rigless – Cutting the Cost of Well Abandonment
0 Seabed
1000 Triassic
2000
Upr Bunter shale3000
Bunter Sand
4000Lwr Bunter Shale
5000Zechstein
Legend
6000
Leman
7000
LimestoneSandstoneShale
AnhydriteClaystoneDolomiteHalite
gasProductionZone
SSSV nipple
Packer
PERFORATE TUBING, CIRCULATE & FLUSH CLEAN
Phase II, Placing barriers 2
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Rigless – Cutting the Cost of Well Abandonment
0 Seabed
1000 Triassic
2000
Upr Bunter shale3000
Bunter Sand
4000Lwr Bunter Shale
5000Zechstein
Legend
6000
Leman
7000
LimestoneSandstoneShale
AnhydriteClaystoneDolomiteHalite
gasProductionZone
SSSV nipple
Packer
PUMP BALANCED CEMENT PLUG (800 FT)
Plug no 1
Phase II, Placing barriers 3
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Rigless – Cutting the Cost of Well Abandonment
0 Seabed
1000 Triassic
2000
Upr Bunter shale3000
Bunter Sand
4000Lwr Bunter Shale
5000Zechstein
Legend
6000
Leman
7000
LimestoneSandstoneShale
AnhydriteClaystoneDolomiteHalite
gasProductionZone
SSSV nipple
Packer
PERFORATE THROUGH TO B-ANNULUS, CIRCUALATE & FLUSH TO CLEAN UP
Plug no 1
Phase II, Placing barriers 4
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Rigless – Cutting the Cost of Well Abandonment
0 Seabed
1000 Triassic
2000
Upr Bunter shale3000
Bunter Sand
4000Lwr Bunter Shale
5000Zechstein
Legend
6000
Leman
7000
LimestoneSandstoneShale
AnhydriteClaystoneDolomiteHalite
gasProductionZone
SSSV nipple
Packer
PUMP BALANCED CEMENT PLUG (500 FT)
Plug no 1
Plug no 2
Phase II, Placing barriers 5
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Rigless – Cutting the Cost of Well Abandonment
Phase III, Remove tree and top of tubing
0 Seabed
1000 Triassic
2000
Upr Bunter shale3000
Bunter Sand
4000Lwr Bunter Shale
5000Zechstein
Legend
6000
Leman
7000
LimestoneSandstoneShale
AnhydriteClaystoneDolomiteHalite
gasProductionZone
SSSV nipple
Packer
Plug no 1
Plug no 2
REMOVE TREE AND 250 FT TUBING
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Rigless – Cutting the Cost of Well Abandonment
Phase IV, Cut & recover casings and conductor
0 Seabed
1000 Triassic
2000
Upr Bunter shale3000
Bunter Sand
4000Lwr Bunter Shale
5000Zechstein
Legend
6000
Leman
7000
LimestoneSandstoneShale
AnhydriteClaystoneDolomiteHalite
gasProductionZone
SSSV nipple
Packer
Plug no 1
Plug no 2
CUT & RECOVER CASING STRINGS AND CONDUCTOR 10 FT BELOW MUD LINE
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Rigless – Cutting the Cost of Well Abandonment
Case Study
Leman Field Well Abandonments
2013 & 2004
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Rigless – Cutting the Cost of Well Abandonment
Leman Field, 27C Platform
Production - Drilling
27C Drilling
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Rigless – Cutting the Cost of Well Abandonment
Phase II Place Barriers
2013
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Rigless – Cutting the Cost of Well Abandonment
Cementing Spread
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Rigless – Cutting the Cost of Well Abandonment
Top deck working area
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Rigless – Cutting the Cost of Well Abandonment
Case Study
Phase III Tree and Tubing
Removal (2004)
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Rigless – Cutting the Cost of Well Abandonment
Tree and wellhead
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Rigless – Cutting the Cost of Well Abandonment
Wellhead and tubing removal
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Rigless – Cutting the Cost of Well Abandonment
Case Study
Phase IV Conductor and Casing Cutting and Removal
(2004)
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Rigless – Cutting the Cost of Well Abandonment
Conductor cutting and removal
Spreader beams
Abrasive cutting spread 27A platform
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Rigless – Cutting the Cost of Well Abandonment
Conductor removal
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Rigless – Cutting the Cost of Well Abandonment
Comparisons
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Rigless – Cutting the Cost of Well Abandonment
Platform Well Abandonments SNS
Time per well
0.00
2.00
4.00
6.00
8.00
10.00
12.00
14.00
16.00
18.00
Rig Lift barge
Platform rigless
Day
s
Cut & recover conductor
Place cement barriers
Suspend and Remove tree
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Rigless – Cutting the Cost of Well Abandonment
Platform Well Abandonments SNS
Cost per well
0
500
1000
1500
2000
2500
3000
Rig SNS Benchmark Platform Rigless
Cos
t per
wel
l £k
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Rigless – Cutting the Cost of Well Abandonment
Conclusions
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Rigless – Cutting the Cost of Well Abandonment
Conclusions • A rig is not necessarily required for complete and safe abandonment • Existing structures already in place can be used • Significant cost savings have been demonstrated • Multi-well campaigns - share mobilisation
- efficient equipment utilisation - team building/learning
• Benefits in doing some wells while field infrastructure is still available
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Thank You