INTRODUCTION TO OFFSHORE STRUCTURAL ENGINEERING

Analyze and design production platform and its component…. anything that relates to structure, load, resistance, structural response...etc.

Manage and administer fabrication (onshore) and installation (offshore) process of production platform

Design and schedule inspection, repair and any maintenance program to prolong structure integrity against degradation mechanisms.

Plan the decommissioning, abandonment and removal off obsolete offshore oil and gas installation, offshore oil rigs, oil & gas platforms and reef effects.

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10. Analyze and design production platform and its
component…. anything that relates to structure, load,
resistance, structural response...etc.
Manage and administer fabrication (onshore) and
installation (offshore) process of production platform
Design and schedule inspection, repair and any
maintenance program to prolong structure integrity
against degradation mechanisms.
Plan the decommissioning, abandonment and removal
off obsolete offshore oil and gas installation, offshore
oil rigs, oil & gas platforms and reef effects.
OFFSHORE STRUCTURES
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11. Analysis
Fabrication
Inspection
Installation
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12. Let say you have to design a transmission
pipeline used to convey petrochemical product
from offshore structure to onshore processing
facilities.
The question is, who determine the size of the
pipeline? …and what is your role as
Engineer/Technologist?
OFFSHORE STRUCTURES
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13. First you explore the potential area with large deposit of oil &
gas (Geologist)
Then you conduct trial drilling (Mechanical)
Once oil and gas is discovered, you start planning the
development of the area (Process, Civil & Mechanical)
Analysis and design of structural element (Civil)
Fabrication of production platform (Civil & Mechanical)
Installation of production platform (Civil & Mechanical)
Repair and Maintenance (Civil & Mechanical)
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17. Let me introduce a general concept of offshore
production platforms or also known as production
rig
A large structure with facilities to drill wells, to
extract and process oil and natural gas, and to
temporarily store product until it can be brought
to shore for refining and marketing.
In many cases, the platform contains facilities to
house the workforce as well.
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19. Riser
Trees (wet and dry)
Drilling rig
Crane
Compressor
Filter/Separator
Water and chemical injection unit
Flare tower
Storage and etc.
OFFSHORE STRUCTURES
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20. Flare tower
Drilling rig/derrickHelipad
Crane
Topside/
Superstructure
Substructure
Risers &
Conductors
Skirt pile
Main pile
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Quarters module
Power generation
& utilities
Production module

23. A wellhead is the component at the surface of an oil or gas well that provides the
structural and pressure-containing interface for the drilling and production The
primary purpose of a wellhead is to provide the suspension point and pressure seals
for the casing strings that run from the bottom of the hole sections to the surface
pressure control equipment.

24. In petroleum and natural gas extraction, a Christmas tree is an assembly of
valves, used in petroleum extraction. The purpose of the Christmas tree is
to isolate the well from the atmosphere and to be able to control the oil
and/or gas flow from the well, or to control injected liquid or gas.

25. Offshore platform consists of super structure and
substructure components.
Any structural elements that constructed below
seawater level is substructure and all structural
elements above seawater level is a super structure
Superstructure of topside has the common function of
providing a safe, dry working environment for the
equipment and personnel who operate the platform
While substructure takes vertical loads from
superstructure as well as provide protection to risers
against horizontal loads.
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26. 26
Typical Compartmental Elements of Topside Deck on a Production Platform
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29. •Subsea is a general term frequently used to refer to
equipment, technology, and methods employed in deepwater
offshore oil and gas developments.
•Under water oil field facilities are generically referred to using
a subsea prefix, such as subsea well, subsea field, subsea
project, and subsea development
•Subsea production refers to production of oil and gas located
on the seabed below sea water level instead of on the topside
•Subsea technology can reduce the dead load on the topside
by transferring the production equipments to the seabed.

30. •Subsea production systems can range in complexity from a single
satellite well with a flowline linked to a fixed platform, FPSO or an
onshore installation, to several wells on a template or clustered
around a manifold, and transferring to a fixed or floating facility, or
directly to an onshore installation
•Subsea production systems can be used to develop reservoirs, or
parts of reservoirs, which require drilling of the wells from more
than one location.
•Deep water conditions, or even ultra deep water conditions, can
also inherently dictate development of a field by means of a subsea
production system, since traditional surface facilities such as on a
steel-piled jacket, might be either technically unfeasible or
uneconomical due to the water depth

32. Wet Trees
Manifold
Flow Line

33. Offshore engineers concerned with what goes
on at the surface of the seas and in the ocean
depths
So, we are responsible to design and build a
reliable and robust platform which able to
sustain imposed loads sourced from the
facilities on board as well as environmental
loads with high degree of integrity until the
end of structure service-life.
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34. https://www.youtube.com/watch?v=WnwgFjnW
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https://www.youtube.com/watch?v=IKMF4oRsx
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