Forage et Production en Grande

Profondeur

(> 1 500 m)

Technologie et Scurit

Ttes de Puits en Surface

Claude Valenchon Saipem s.a.

ATELIER 4

2Agenda Introduction

Saipem Subsea vs. dry-tree development

Existing dry-tree units : Tension leg platform (TLP) SPAR Geographical distribution

New concepts proposed by the industry Deep-draft semi-submersible Barge type

Drilling: Surface BOP vs. subsea BOP Dry-tree unit selection criteria

Functions and environmental conditions Incentives and favourable factors

Conclusion

3IntroductionIntroductionIntroduction

4OnshoreOnshoreOnshore

OffshoreOffshoreOffshore

Offshore Offshore DrillingDrilling OnshoreOnshore DrillingDrilling

Introduction : Saipem - Three Global Business Units

DrillingDrillingDrilling

5AkpoAkpo URF (Nigeria)URF (Nigeria)

1350m WD1350m WD

Production and Injection Network-Umbilical Network-Gas Export pipeline-Oil Loading Terminal (OLT)-FPSO Mooring System

Sequoia (Egypt)Sequoia (Egypt)

Field Development and Floating Production

SURF EPCI

Manifolds, PLETs, flowlines, jumpers

53 km. of umbilicals

Normand CutterNormand Cutter

UsanUsan (Nigeria)(Nigeria)

Client: TotalClient: Total

URF and Loading Terminal EPCI URF and Loading Terminal EPCI

Local Content:

1.2 million man-hours

Introduction : Saipem - Large / Deepwater Projects

ErhaErha -- FPSO EPC (Nigeria)FPSO EPC (Nigeria)

6Introduction : Saipem Offshore Technology Development Topics

Dry-tree barge

Offshore renewables

Subsea process

Floating LNG

SURF Technologies

7Introduction : Typical Deepwater Subsea Development (AkpoAkpo Total Total Nigeria)Nigeria)

Risers

FPSO

Subsea wells

Drill ship

Flowlines

Introduction : Typical Deepwater Dry-Tree Development (Kizomba - Exxon - Angola)

9ExistingExistingExisting DryDryDry---TreeTreeTree UnitsUnitsUnits

10

Tension leg platforms (TLP): First TLP: 1984 HUTTON (Conoco), North Sea

147 m wd Deepest TLP: 2005 MAGNOLIA (Conoco-Phillips), GoM

1425 m wd Maximum design depth: 2500 m wd (est.)

Existing Deepwater Dry-Tree Units (1)

11

Spar: First Spar: 1997 NEPTUNE (Anadarko), GoM

590 m wd Deepest Spar: 2010 PERDIDO (Shell), GoM

2380 m wd Maximum design depth: 3000 m wd (est.)

Existing Deepwater Dry-Tree Units (2)

12

North Sea

3 TLPs

Gulf of Mexico

17 Spars16 TLPs West Africa

4 TLPs

Southeast Asia

1 Spar1 TLP

Deepwater Dry-Tree Units Geographical Distribution

13

New Concepts New Concepts New Concepts proposedproposedproposed by the by the by the IndustryIndustryIndustry

14

Proposed by: Aker Solutions: DDP Floatec: Truss semiTM, E-semiTM Horton Wison: Multi-column Floater Moss Maritime: Octabuoy Technip: EDP

Main characteristics: From Mild to Harsh environment Wide range of water depth (150 m 3000 m) Can accommodate drilling, production and limited crude storage Up to 30 wells

Dry-Tree Deep Draft Semi-Submersible

15

Example of Deep-Draft Semi-Submersible: EDP Extendable Draft Platform (Technip)Main characteristics: The EDP has:

Superior motions to a conventional semi-submersible Equivalent motions to a Spar Simple taut moorings

Production & drilling Wide payload range from wellhead

platform up to 50,000 tonnes and above Full drilling surface BOP Tender assisted drilling (TAD)

Construction & Transport Configuration

Operational ConfigurationCourtesy

16

Example of Deep-Draft Semi-Submersible: Octabuoy (Moss Maritime-Saipem)

Currently under construction for ATP 2 successive planned applications for this unit namely the

Cheviot field (150 m water depth) in the North Sea and a GoM deepwater field (1500 m water depth)

10 dry trees

Courtesy

17

Specific environmental conditions (Gulf of Guinea):Mild extreme environment: - Directional environment (swell, wind),

- Occasional long period swell with small amplitudes

Barge Type: the WellHead Barge (Saipem)

95% of wavesHs < 4.5 mTp < 16 s

Wind

Hs < 2.5 mTp < 11 s

West of Africa Gulf of Guinea

18

Large Water depth range from 500m to 3000 m WD

From 6 to 30+ free standing top-tensioned dry-tree risers

From test and manifold only to full process capability

Large topsides loads capacity: oil production from 50,000 bopd to 250,000 bopd

Flexibility in rig selection Segregation of functions: utilities,

drilling, dry-tree, process highsafety level

WellHead Barge: Key Features

Drilling rig

Living quarter

Hull & moorings

High pressure

risers

Process Modules

Utilities modules

19

Typical WellHead Barge for 20 wells, 100,000 bopd: General Overview and Dimensions

ProcessDrilling& Risers

UtilitiesLiving Quarter

Hull

Topsides

Hull dimensions:

Length: 260 m

Width: 60 m

Height: 20 m

Moonpool: 70 x 20 m

20

DrillingDrillingDrilling: Surface BOP vs. Subsea BOP: Surface BOP vs. Subsea BOP: Surface BOP vs. Subsea BOP

21

Drilling: Surface BOP vs. Subsea BOP

Surface BOP Used on fixed platform, TLP, SPAR Smaller, lighter and simpler BOP Permanent visual inspection Easier and simpler BOP test procedures Suitable for dual barrier drilling riser Short kill lines

Subsea BOP : Used with drillship or drilling semi-submersible Heavy and complex system at seabed BOP tests more complex and difficult Long kill lines (more difficult well control)

22

DryDryDry---TreeTreeTree Unit Unit Unit SelectionSelectionSelection CriteriaCriteriaCriteria

23

Completion only (drilling by MODU) Drilling and completion (included, or with tender) Work-over Accommodation and utilities Process from Manifold and test only to all process functions Oil storage (limited on deep-draft semi-submersible, possible on barge type)

Environmental conditionsEnvironmental conditions From mild to harsh: TLP, Spars, deep-draft semi-submersible Mild (Gulf of Guinea): Barge type

Dry-Tree Unit Selection Criteria

Possible Possible FunctionsFunctions of Dryof Dry--TreeTree UnitsUnits

24

Incentives: Rapid and easy access to well for control, monitoring and interventions Easier use of ESPs in wells (thanks to easy access); Better reservoir management

(no commingling of well fluids, monitoring per well,...); Improvement of flow assurance; Higher recovery factor Independence from drilling rig availability.

Favourable factors for the selection of a dry-tree unit: Compact reservoirs; Deeply buried reservoirs; Wells requiring frequent interventions

(monitoring, ESPs, water flooding, side-track); Scarcity / high cost of drilling vessels.

Deepwater Dry-Tree Units Selection Criteria (vs. Subsea wells)

25

ConclusionConclusionConclusion

26

Conclusion

DryDry--tree units have an excellent track recordtree units have an excellent track record Wide range of possible functions from completion / wellhead only,

to drilling wellhead and full production Wide range of environmental conditions and water depth Reduced subsea IMR operations during field life

(less equipment on sea-bed)

DryDry--tree units might be a good way to develop deeper and tree units might be a good way to develop deeper and more difficult reservoirs?more difficult reservoirs?