tension-leg platform (tlp) for present

8/10/2019 Tension-leg Platform (Tlp) for Present

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TENSION-LEG PLATFOR

(TLP)

CET- 648 DESIGN OF FIXED AND FLOATING OFFSHORE STRUC



LT Sirapol Rungratanubol

Presented By

Mr.Wisit Kawayapanik ID:55070700954

Mr.Nattapon Chaipromma ID:56070700904

Mr.Prasong Suramai ID:56070700906

Mr.Wichan Bootdee ID:56070700908

Mr.Suttiwat Limjirawatana ID:56070700912

Tension-leg platform (TLP)



History

Component

◦ Installation sequence

◦ Platform Installation

Structural Design and Design Criteria

P-61 TLP New platform


Content



.


History

1500 to 7000 Ft



First offshore in Gulf of Mexico, USA 1947. (Kerr-McGee)

Kermac Rig No. 16

TLPs have been in use since the early 1980s.

leg platform was built for Conoco's Hutton field

Day Tree, Water Depth 482feet,


History

http://en.wikipedia.org/wiki/Hutton_oilfield





1989 First Wellhead TLP Jolliet, Gulf of Maxico, USA

Day Tree, Water Depth 1,759feet,


History



1995 BIGGEST TLP Heidrun, Norwegian Sea, NORWAY

Day/Wet Tree, Water Depth 1,132feet,


History



1998 First mini-TLP Morpeth, Gulf of Maxico, USA

Wet Tree, Water Depth 1,699feet,


History




History

2005 Deepest TLP Mannolia, Gulf of Maxico, USA

Day Tree, Water Depth 4,674feet,




History

2014 Lastly TLP P-61 Tension Leg Wellhead Platform (TLWP)




History

http://localhost/var/www/apps/conversion/tmp/scratch_2/0210OS-TLP-Poster012510Ads.pdf




History

25



Tension leg platform (TLP) is one of the most widely installed floaproduction system (FPS) for offshore deepwater oil and gas dev

TLP is particularly suitable for water depth between 300 m to 160


Component



Tension leg platform (TLP) are three type;

Full-size TLPs

Mini TLPs

Wellhead TLPs


Component



Unlike the semi-submersible Permanently site production

Hull is to provide buoyancy, both for support of weight and to provide tendon tens

Ballast is provide to even loading between tendon and also to offset unused paylo

Function and stability for support both, wet-tree and dry-tree

Allow for small Heave, Roll, Pitch


Component



TLP is one of the two floaters which can support dry tree production syscomparison with the wet tree production system. The advantages ;

1. Higher production reliability.

2. Lower drilling and operation cost.

3. Less flow assurance risk and potentially higher recovery.

4. Direct vertical access for well intervention activity.

5. Minimal offshore construction.


Component




Component

Topside

Hull system

Tendons

Riser




Component




Component

( )



1.Erect 1st segment (bottom segment)


Component : Installation sequence

T i l l f (TLP)



2. Hang-off on installation vessel side

3. Pick-up and Erect next segment (main body segment)



T i l l tf (TLP)



4. Make-up connection between 1st and 2nd segment

5. Lower and hang-off



Merlin connectors Make-up tool

T i l l tf (TLP)



6. Repeat until top segment is connected

7. Installation temporary buoyancy module (TBM)



6

7

T i l l tf (TLP)



8. Hook-up tether to bottom receptacle on foundation

9. Fill TBM with air



T i l l tf (TLP)



1. Position platform

2. Hook-up temporary wire to top of

tethers


Component : Platform Installation

Tension leg platform (TLP)



3. Ballast down platform while pulling in

on winches

4. Guide the length adjustment joint into

the tether porches

5. At correct draught, level platform and

lock-off

6. De-ballast platform until proper pre-

tension is achieved






7. Remove the TBM and other auxiliary

equipment







Component





Structural Design and Design Criteria : Code & Standard




•General

•Operational requirement

•Stability requirement

•Environmental criteria

•Design case


Design criteria




General

This requires that each phase of construction,

transportation, installation, and operation be

coupled with design environmental events

and associated allowable stresses and/or

safety factors.


Design criteria




Operational requirement

Design criteria dictated by operational

requirements should be reviewed during each

iteration of the design spiral.

Examples of such requirements

•Simultaneous drilling and production.

•Maintenance procedures and frequency.


Design criteria




Stability requirement

•Free floating condition

•Inplace condition

•Intact condition

•Damaged condition

•Weight and center of gravity determination


Design criteria




Environmental criteria

•Environmental criteria should be associated with

a recurrence interval of the response of the

structure

•Selection of the actual data needed should be

made only after consultation with both the

platform designer and

meteorological/oceanographic specialists

g p ( )

Design criteria




Environmental criteria

•Mathematical models should be utilized to

develop the description of normal and extreme

environmental conditions

•All data used should be documented. The quality

and the source of all data should be recorded,

and the methods employed in developing data

into the desired environmental values

g p ( )

Design criteria




Design case

•Project phase.

•System condition.

•Environment.

•Safety criteria

g p ( )

Design criteria




Load type

•Dead load

•Live load

•Environmental load

•Inertial load

•Construction load

•Hydrostatic load

g p ( )

Design criteria




g

Design criteria

Dead load (Approximate)

•Top side facility 5800 tons

•Deck structure 3400 tons

•Riser load 2400 tons




Wind force

Design criteria

Steady wind fluctuating velocity




Current force

Design criteria




Wave force

Design criteria




Drag coefficient

CD drag coefficient = 0.6 – 1.2

Mass coefficient

Design criteria




Structural Design

Global Design Platform Design Tendon DesignFoundation

Design




Structural Design and Design Criteria : Global Design and Ana





Flexible

Surge

Sway

Yaw

Rigid

Roll

Pitch

Heave




Structural Design and Design Criteria : Environmental parame

to response




The TLP hull structure is a stiffened plate structure with internal longitudina

girders, web frames, bulkheads and flats. Its major components usually inc

node, pontoon and tendon porches.

Structural Design and Design Criteria : Structural Design





Global structural strength analysis

The global structural strength analysis ishydrodynamic and structural analysis. The stren

includes static loads , quasi- static loads contrib

platform offset and dynamic loads.

Global structural fatigue analysis

Fatigue calculations involve statistical

data，structural modeling，stress response





Hull to topside connection and upper column frame an

Control load cases for the TOC(the top of colu

and UCF(Upper column frames) connections are iden

screening for all

• waves

• phases to maximize high stresses from global stren

Strength analysis and buckling checks are then pe

the detailed local model





Pontoon to column connection analysis

In general, conventional TLP structure has large

column spacing in order to satisfy the stability re

Pry/squeeze loads are typically the dominating lo

conventional TLP platform due to large column s

column height. The connections between pontoo

are heavily dominated by dynamic load and gove

strength and fatigue.




Structural Design and Design Criteria :




Structural Design and Design Criteria : Tendon Design






St t l D i d D i C it i T d D i




Note : The Platform was further designed for a maximum lateral offset limited to 7% of

100-year hurricane conditions and to 10% of water depth with 1,000-year conditions


F d ti D i



Type

•Pile & integrated template

•Pile & independent template

•Shallow

Foundation Design


Foundation Design



Analysis pile template structure

•Template modeling

•Soil modeling

•Pile soil interaction

Foundation Design


Foundation Design



Design pile template structure

Axial capacity

Foundation Design


Foundation Design



Analysis shallow foundation

•Mudmat modeling

•Gravity template modeling

Foundation Design


Foundation



Design shallow foundation

Uplift capacity

Foundation

DrainedUndrained

Consider only submerged weight F.S = 1.25

Consider both term F.S = 2


Foundation



Design shallow foundation

Sliding capacity

Foundation

DrainedUndrained

F.S =1.5


Structural Design and Design Criteria : Riser Design




Riser design requires that the riser response

to the platform motions and the

environmental loads be obtained. Local

forces and moments derived from the

response analysis are then used for thedesign of the individual riser components.






Riser Design Activities




g g g


P-61 Tension Leg Wellhead Platform (TLWP)



g ( )

P-61 TLWP Detail

Oil production capacity: 100,000 barrels/day;

Own capacity for electricity generation: 3 X 2000

External electricity capacity: Up to 35 MW receive

processing cargo;

Water depth: 1,200 m;

Living quarters: 60 people,

Total platform weight: about 23,000 tons.

Design life of 25 years.

Dry-docking





g ( )

Tendons and pilesTopsides

Engineering by

McDermott (Houston)

Constructed in

Singapore by Keppel

FELS

Fabrication pipe and

tendons by

Mcdermott’s

P-61 TLWP

Hull

Design by FloaTEC

(Houston)

Co

b


P-61 TLWP Model test



Tendon porch





Construct





Topsides i

using th



Technology

The combination of oil reservoirs with an API gravity ra

and 17, and being in deep water, makes developing th

one of the most complex projects ever conceived by P

several innovative solutions to be incorporated, includi

The TLWP model resembles a semisubmersible (SS),

vertical tendons to anchor it instead of the standard m

This technology means that the platform has a lower rallowing dry Christmas trees (well control valves), dep

of TLWP, rather than on the seabed, which is the case

FPSOs. The reason for using this alternative is to mak

intervene in the wells by using submerged centrifugal





The McDermott team was instrumental

support and executing the offshore traninstallation of the TLWP offshore Brazil

The project was carried out with signific

by Chevron to the TLWP design, const

Commissioning of the platform continue

the FloaTEC project team.

Derrick Barge 50 (“DB50”), a specialize

vessel, to install the tendons, McDermo

its offshore campaign without a single L




Thank you

tension-leg platform (tlp) for present

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