This document provides an overview of subsea pipeline systems. It discusses the key components including wellhead platforms, risers, pipelines, manifolds, and flowlines. It then describes various types of subsea pipelines and their purposes for transporting hydrocarbons from offshore production units to shore. The rest of the document outlines the major design considerations and analyses performed for subsea pipelines, such as sizing, material selection, mechanical design, stability, crossings, and cathodic protection. Standards and codes used for subsea pipeline design are also listed.
Overview of main components of subsea production / injection systems, including:
Wellhead
Subsea tree (Vertical, Horizontal, or Drill-thru)
Structural foundation / Template / Manifold /Jumpers
Subsea processing equipment
Chemical injection system
Umbilical with electrical power and signal cables
Risers
Production Control and Monitoring System
Introduction to offshore oil and gas surface facilities, including drilling rig types, topside and substructures, jacket, compliant tower, jack up, gravity based structure, fpso, fso, semi submersible, tlp, spar, wellhead platform, processing platform, pipeline, and surface facilities selection
Overview of main components of subsea production / injection systems, including:
Wellhead
Subsea tree (Vertical, Horizontal, or Drill-thru)
Structural foundation / Template / Manifold /Jumpers
Subsea processing equipment
Chemical injection system
Umbilical with electrical power and signal cables
Risers
Production Control and Monitoring System
Introduction to offshore oil and gas surface facilities, including drilling rig types, topside and substructures, jacket, compliant tower, jack up, gravity based structure, fpso, fso, semi submersible, tlp, spar, wellhead platform, processing platform, pipeline, and surface facilities selection
Subsea Field Development for an ideal Green field.Emeka Ngwobia
• The Daiyeriton Field is a green field development project. The subsea field layout with its drill centers has been illustrated in slide 2. New flowlines and pipelines will tie-in to the existing Daiyeriton floating production, storage, and offloading (FPSO) vessel. The new system will enable the transportation of production and injection fluids to and from the Daiyeriton field facilities from five new drill centers: DC-SW, DC-NW, DC-SE, DC-NE and DC-E. DC-SE, DC-SW, DC-NE and DC-E are dedicated production drill centers while DC-NW is a dedicated WI drill center. Gas lift will be provided at the riser base of a new 12-inch production flowline.
•The water depth at the proposed development sites range from 800 m to 1000 m.
Subsea pipelines are the arteries of the offshore industry, and around the world more than 18,000km are in service. Part of almost every project, they often form a large component of project cost. This course will provide a complete and up-to-date overview of the area of Subsea Pipeline Engineering, taking delegates through the pre-design phase, design, construction, installation, operation and maintenance.
It will give a complete picture of the work of design engineers and pipeline construction companies, using actual case studies from around the world to highlight the topics discussed. While the course requires no previous experience, this is not a superficial overview. The lecturers bring to the course a long experience of industry projects, in many parts of the world and under varied conditions. The technology is far from being static, and the trainers will discuss new developments and ideas for the future.
Speaker: Dr Jinzhu Xia, Head Consultant, Marine, Granherne, Australia
Date: Tuesday, 6 March 2012
Hosted by: WA Oil & Gas Facilities Group a co-venture between Engineers Australia and the Society of Petroleum Engineers (SPE)
This is an academic lecture for Diploma in Engineering 7th Semester Mining and Mine Survey Technology. The Course related to this presentation is Well completion and testing
Subsea Field Development for an ideal Green field.Emeka Ngwobia
• The Daiyeriton Field is a green field development project. The subsea field layout with its drill centers has been illustrated in slide 2. New flowlines and pipelines will tie-in to the existing Daiyeriton floating production, storage, and offloading (FPSO) vessel. The new system will enable the transportation of production and injection fluids to and from the Daiyeriton field facilities from five new drill centers: DC-SW, DC-NW, DC-SE, DC-NE and DC-E. DC-SE, DC-SW, DC-NE and DC-E are dedicated production drill centers while DC-NW is a dedicated WI drill center. Gas lift will be provided at the riser base of a new 12-inch production flowline.
•The water depth at the proposed development sites range from 800 m to 1000 m.
Subsea pipelines are the arteries of the offshore industry, and around the world more than 18,000km are in service. Part of almost every project, they often form a large component of project cost. This course will provide a complete and up-to-date overview of the area of Subsea Pipeline Engineering, taking delegates through the pre-design phase, design, construction, installation, operation and maintenance.
It will give a complete picture of the work of design engineers and pipeline construction companies, using actual case studies from around the world to highlight the topics discussed. While the course requires no previous experience, this is not a superficial overview. The lecturers bring to the course a long experience of industry projects, in many parts of the world and under varied conditions. The technology is far from being static, and the trainers will discuss new developments and ideas for the future.
Speaker: Dr Jinzhu Xia, Head Consultant, Marine, Granherne, Australia
Date: Tuesday, 6 March 2012
Hosted by: WA Oil & Gas Facilities Group a co-venture between Engineers Australia and the Society of Petroleum Engineers (SPE)
This is an academic lecture for Diploma in Engineering 7th Semester Mining and Mine Survey Technology. The Course related to this presentation is Well completion and testing
SUBSEA PIPE LINES IN SUBMARINE STATE . • Flowlines transporting oil and/or gas from satellite subsea wells to subsea manifolds
• Flowlines transporting oil and/or gas from subsea manifolds to production facility platforms
• Infield flowlines transporting oil and/or gas between production facility platforms
• Export pipelines transporting oil and/or gas from production facility platforms to shore
• Flowlines transporting water or chemicals from production facility platforms, through subsea injection manifolds, to injection wellheads.
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2. Well head Platform
Riser
Process Platform
Pipeline crossing
Expansion Spool Piece
To shore
Grouted Supporting bag
Export lines
Well head
Existing line
Subsea mainfold
Tie in
Riser
Flowlines or Pipelines
Well head
Figure 1.1 Subsea System & Flowlines
3. Introduction
Subsea Pipelines are used for the transportation
of offshore Hydrocarbons from one Platform to
another and or Platform to Shore
5. Pipelines are used for a number of purposes in the development of
offshore hydrocarbon resources These include e.g.:
Export (transportation) pipelines
Pipeline bundles.
Flowlines to transfer product from a platform to export lines
Water injection or chemical injection Flowlines
Flowlines to transfer product between platforms
Subsea manifolds and satellite wells;
6. SUBMARINE PIPELINE SYSTEMS
PIPELINE
Pipeline is defined as the part of a pipeline system which is
located below the water surface at maximum tide (except for
pipeline risers)
Pipeline may be resting wholly or intermittently on, or buried
below, the sea bottom
PIPELINE COMPONENTS
Any items which are integral part of pipeline system such as
flanges, tees, bends, reducers and valves
PIPELINE SYSTEM
An inter connected system of submarine pipelines, their risers,
supports, isolation valves, all integrated piping components,
associated piping system and the corrosion protection system
7. Risers
A Riser is a conducting pipe connecting sub-sea wellheads, templates or
pipelines to equipment located on a buoyant or fixed offshore structure.
Types of riser
Rigid riser
- for shallow water
Catenary steel riser - for deep water
Flexible riser
- for deep and shallow water
Riser clamp
Riser are supported/guided from the jacket members through
clamps
Types of Clamp
Hanger clamp
Fixed clamp
Adjustable clamp
10. Restrained lines
Pipelines which cannot expand or contract in the longitudinal
direction due to fixed supports or friction between the pipe and soil
Unrestrained lines
Pipelines without substantial axial restraint. (Maximum one fixed
support and no substantial friction).
Platform
Platform
FL 1
FL 3
FL 4
Hanger clamp level
Sea surface level
Riser 1
FL 21
FL 20
FL 19
Riser 2
73.5 m
74 m
FL 5
0.00 m
2
m
FL 2
7.5 m 7.5 m
2
m 7.5 m 7.5 m
FL 22
1:7
1:7
FL 18
Sea bed
14 m 112 m
FL 6
FL 7
562.5 m
FL 8
500 m x 6 nos
FL 9 to 14
Concrete CTE coating
Monel coating
Paint
562.5 m
112 m 14 m
FL 15
FL 16
FL 17
12. PIPELINE SIZING
In general it means fixing up the pipeline nominal
diameter (6Ɛ,10Ɛ etc.,) which deals with the important
aspects like...
MAXIMUM FLOW RATE CONDITION
CHECK FOR THE FLOW CONDITION (pressure drop
flow velocity)
CHECK FOR SECONDARY CRITERIA like Ʀ.
# Flow regime (mix of hydro carbon, single/multi phase
flow)
# Temperature profile
# Erosion velocity
14. PIPELINE MATERIAL SELECTION
The governing parameters for the particular type of material to
be used are
Temperature
Pressure
Surrounding Environment.
Environment.
Corrosive elements (CO2 and H2 S)
Carbon steel (Carbon - Manganese Steel) C.S.Nace, C.R.A.
Steel)
p
API - 5L of Grade Ranges From X - 42 to X - 80
p
X-80 - Toughness and Weldability are limitations
p
API - 5L X- 52 ,60 65 Grades are commonly used.
used.
15. PIPELINE MECHANICAL DESIGN
The mechanical design of the pipeline is carried to with stand factors like
Internal pressure
External Pressure
Do
Hydrostatic Collapse
Di
Buckle initiation
Buckle Propagation
Po
Po
Po
Pi
W
W
ho
ho
16.
17. PIPELINE SPAN ANALYSIS
Causes of the Pipeline Spans are
Uneven Seabed on Selected route
Pipeline Crossing seabed rock outcrop
Sand Waves
Scour
All these result in spanning and cause
Excessive yielding (Results in High Bending
Moments)
Buckle Initiation and there by Propagation
Longitudinal loads
Unsupported length
18.
19. PIPELINE STABILITY
Pipeline once installed at the sea bed should be sufficiently stable
to avoid any overstressing, deterioration of coating etc., due to
wave and current generated movements
PIPELINE STABILITY
Vertical stability
Lateral stability
20. Vertical stability
Sinking in to the sea bed during maximum fluid density
condition.
Floating of Buried Pipeline during Empty condition Soil
Liquefaction.
The Pipe sinkage is determined as the depth at which the applied
pipe pressure equals the soil bearing resistance.
Soil deformation(pipe sinkage)H,is given by:
sinkage)H
H = D/2-[(D/2)2 ± (B/2)2]1/2
D/2-
Where,
D = Overall pipe outside diameter including pipe coatings
B = Projected contact area between pipe and soil =P/qu
Where,
qu = CNC +1/2BK NK
+1/2BK
qu = Ultimate bearing capacity of soil
P = Pipe submerged weight including pipe coatings and in water
filled condition per unit length.
21. Lateral stability
It is the capacity to resist the lateral forces due to
Environmental loads.
Forces to be considered for Lateral stability analysis
Submerged weight WS
Lateral resistance R
Friction Q
Drag force FD
Lift force FL
22. The stability criterion is expressed as
(Ws - FL) Q u (FD + FI) S
Where,
S
Ws
FL
FD
FI
Q
=
=
=
=
=
=
safety factor (1.1)
submerged weight of pipeline/unit
length, for nominal wall thickness
(t), N/m
hydrodynamic lift force, N/m
hydrodynamic drag force, N/m
hydrodynamic inertia force, N/m
lateral coefficient of friction between
pipe and seabed.
23. Methods of Pipeline stabilization
Increase Pipeline wall thickness
Provide Concrete Weight Coating
Lay the Pipeline in Open trench
Trench and bury the Pipeline
Provide Concrete Mattress over Pipeline
Stabilize Pipeline by Rock dumping
25. Sea bed
Tren h
all
Natural fill
Buried pipe- Natural Fill
Jetted in pipe
Tremie concrete
rmor rock
Back fill
Bedding
Buried pipe- Armor Cover
Bedding
Buried pipe- Concrete Cover
Stabilization Methods for buried Submarine pipeline
28. PIPELINE CROSSING ANALYSIS
Crossings are designed to Give a Physical separation
Between The Proposed Line Existing Line.
To Avoid Interfacing Of Cathodic Protection Between
The Two Lines
A min of 300mm gap is Provided b/w the lines as per the DNVDNVCode.
29. Crossing analysis methodology
»
Pipeline Crossing Span Calculation.
Pipeline Dynamic Span Calculation
»
Number of Supports to be Provided.
»
Pipeline Crossing Flexibility analysis
»
Pipeline Crossing Support design against,
»
Bearing capacity
Over turning
Sliding
Settlement
30. PIPELINE CATHODIC PROTECTION SYSTEM DESIGN
The Subsea pipelines are provided with sacrificial anodes made of
Aluminum or Zinc to protect against marine corrosion
Important parameters for Anode Design
*
Surface area of the Pipeline
*
Fluid and Anode temperature
*
Break down
*
Design service life of Anodes
31.
32.
33. MAJOR DESIGN CODES AND STANDARDS
DNV 1981
DNV 2000
- Rules for submarine pipeline system
- Submarine pipeline system
API 5L
- Specification for line pipe
BS 8010
- Code of practice for pipeline
NACE RP 0169 - Recommended practice,control of external
corrosion on underground or submerged
metallic piping.
OISD 141
- Design and construction requirements for
cross country hydrocarbon pipeline.
ASME B 31.8
system.
-Gas transmission and distribution piping
ASME B 31.4
- Pipeline transportation systems for liquid
hydrocarbon and other liquids