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Offshore Oil and Gas
Production System
Nguyễn Quang Minh
Mechanical Engineer
Vietnam Oil and Gas Group
PetroVietnam Gas Jo...
Content
I. Overview
II. Offshore Platform
III. Crews
IV. SCADA
V. Fire & Explosion Protection
VI. Environment Protection
2
WELL
PLATFORMS
PROCESS
PLATFORMS
ONSHORE
TERMINALS
DATA/SCADA
POWER
FLUID ( OIL/GAS/WATER )
INJECTION WATER
LIFT GAS
FSO
O...
4
THE MAJOR ELEMENTS OF OFFSHORE
PRODUCTION SYSTEM
• WELLS (SUBSEA/PLATFORM WELLS)
• WELL PLATFORMS/WELL SERVICING RIGS
• FE...
II. OFFSHORE PLATFORMS
- A large structure used to house workers and machinery needed to
drill and/or extract oil and natu...
A. Type of offshore platforms
7
• Fixed Steel Structure: Giàn cố định
• Compliant Tower: Tháp mềm
• Jack-up Platform: Giàn tự nâng
• Concrete Gravity Base...
1. Fixed Steel Structure
- The traditional offshore structure
consists of weld steel, tubular
framework or jacket to suppo...
2. Compliant Tower
- They have a steel tubular jacket that is used to
support the topside facilities and they are
secured ...
3. Jack-up Platform
- The Jack-up Platform consists of
a triangular shaped (sometimes
rectangular), box section barge
fitt...
4. Concrete Gravity Base Structure
- The Concrete Gravity Base Structure have
been constructed using a base
manufactured f...
5. Tension Leg Platform (TLP)
- A Tension Leg Platform (TLP) is a buoyant
platform held in place by a mooring
system.
- Th...
6. Semi-submersible Vessel
- Have twin hulls (columns and
pontoons) of sufficient buoyancy
to cause the structure to float...
7. FPSO
- FPSOs are large ships
equipped with processing
facilities and moored to a
location for a long period.
- The main...
16
8. SPAR Platform
• A spar is a type of floating oil
platform typically used in very deep
waters, and is named for logs use...
9. Subsea system
18
B. Facilities of Offshore Platform
- Wellhead Platform
- Process Platform
- Platform Complex
19
1. Wellhead Platform (WHP)
- A wellhead platform includes an integrated deck, utility systems,
wellhead systems, living qu...
2. Process Platform
- Separation (Oil, Gas and
Produced water)
- Gas Compression & dehydration
- Produced Water Conditioni...
3. Platform Complex
Ekofish Complex
22
III. Crews
• OIM (offshore installation manager) is the ultimate authority during his/her shift and makes
the essential de...
IV. SCADA
- SUPERVISORY CONTROL AND DATA
ACQUISITION
- Gather necessary DATA from a
REMOTELY LOCATED Oil/Gas well
and Well...
SCADA Management
25
Benefit of SCADA
• 24 hrs online monitoring control from onshore center
• Historical Data and trending helps in Troublesho...
V. FIRE AND EXPLOSION PROTECTION
- Unpredictable
- Cause: Human and Natural
Disater

- Fire & Explosion Protection
- Risk...
- Emergency Shutdown (ESD) system
+ Levels of Shutdown
+ Isolation Valve Requirements
- Depressurization, Blowdown and Ven...
Fire Detection & Suppression System
Detection system
- Gas Detection
- Fusible Plug
- Fire Detection
- Smoke Detection
- H...
VI. Environment Protection
30
31
Contact: minha4k47@yahoo.com.vn
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Offshore oil and gas overview

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oil and gas overview

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Offshore oil and gas overview

  1. 1. Offshore Oil and Gas Production System Nguyễn Quang Minh Mechanical Engineer Vietnam Oil and Gas Group PetroVietnam Gas Joint Stock Corporation
  2. 2. Content I. Overview II. Offshore Platform III. Crews IV. SCADA V. Fire & Explosion Protection VI. Environment Protection 2
  3. 3. WELL PLATFORMS PROCESS PLATFORMS ONSHORE TERMINALS DATA/SCADA POWER FLUID ( OIL/GAS/WATER ) INJECTION WATER LIFT GAS FSO OIL TO REFINERY GAS TO CONSUMERS OIL GAS WELL WELL FLUID INJ WATER LIFT GAS UMBILICAL (DATA/WELL CONTROL WELLS/CONNECTED WELL PLATFORM SEPARATION MODULE‐ OIL/GAS/WATER GAS COMPRESSION AND DEHYDRATION MODULE SEA WATER TREATMENT FOR WATER INJECTION PRODUCED WATER TREATEMENT MODULE POWER GENERATION UTILITIES ‐ WATER/SUPPLIES LIVING QUARTERS DRILLING/WELL SERVICING RIG MODULE WELLS WELL TESTING PRODN OPTIMIZATION WELL CONTROL WELL SERVICING TELEMETRY / SCADA WELLS OIL PRODUCERS GAS PRODUCERS INJECTION WELLS I. OVERVIEW OFFSHORE PRODUCTION SYSTEM‐ A SCHEMATIC 3
  4. 4. 4
  5. 5. THE MAJOR ELEMENTS OF OFFSHORE PRODUCTION SYSTEM • WELLS (SUBSEA/PLATFORM WELLS) • WELL PLATFORMS/WELL SERVICING RIGS • FEEDER SUBSEA PIPELINES • PROCESSING PLATFORMS • EXPORT PIPELINES FOR OIL/GAS • TANKERS FOR EVACUATION OF OIL 5
  6. 6. II. OFFSHORE PLATFORMS - A large structure used to house workers and machinery needed to drill and/or extract oil and natural gas through wells in the ocean bed - Though as technology improves, drilling and production in deeper waters becomes both feasible and profitable. - Many platforms also have remote wellheads attached by umbilical connections, these may be single wells or a manifold centre for multiple wells 6
  7. 7. A. Type of offshore platforms 7
  8. 8. • Fixed Steel Structure: Giàn cố định • Compliant Tower: Tháp mềm • Jack-up Platform: Giàn tự nâng • Concrete Gravity Base Structure: Giàn trọng lực • Tension Leg Platform (TLP): Giàn chân căng • Semi-submersible Vessel: Giàn nửa chìm nửa nổi • Floating Production System: Hệ thống khai thác nổi • Spar Platform: Giàn Spar • Subsea system 8
  9. 9. 1. Fixed Steel Structure - The traditional offshore structure consists of weld steel, tubular framework or jacket to support the topside facilities. Piles driven into the seafloor secure the jacket. - The Fixed Steel Structures are restricted to shallow water developments with water deep about 1500 ft. 9
  10. 10. 2. Compliant Tower - They have a steel tubular jacket that is used to support the topside facilities and they are secured to the seafloor with piles. - Unlike fixed platforms, compliant towers yield to the water and wind movements in a manner similar to floating structures. The jacket of a compliant tower has smaller dimensions than those of a fixed platform. - Compliant towers are designed to sustain significant lateral deflections and forces, and are typically used in water depths ranging from 1,500 to 3,000 ft 10
  11. 11. 3. Jack-up Platform - The Jack-up Platform consists of a triangular shaped (sometimes rectangular), box section barge fitted with three (sometimes four) moveable legs which enable the vessel to stand to the seabed in water depths of up to 120 m (400 ft). 11
  12. 12. 4. Concrete Gravity Base Structure - The Concrete Gravity Base Structure have been constructed using a base manufactured from reinforced concrete. - The design of base includes void spaces or caissons to provided the structure with a natural buoyancy which will enable it to be floated to field development location. Once on location the void spaces are flooded on the seabed whilst the topside modules are lifted into place. - The void spaces then used as storage compartments for crude oil, or filled with permanent iron ore ballast. - The colossal weight of concrete structures obviates the need to install foundation piles, hence the name gravity base structure. 12
  13. 13. 5. Tension Leg Platform (TLP) - A Tension Leg Platform (TLP) is a buoyant platform held in place by a mooring system. - The mooring system is a set of tension legs or tendons attached to the platform and connected to a template or foundation on the seafloor. The template is held in place by piles driven into the seafloor. This method dampens the vertical motions of the platform, but allows for horizontal movements. - TLPs are used in water depths from 1500 ft to 7000 ft. 13
  14. 14. 6. Semi-submersible Vessel - Have twin hulls (columns and pontoons) of sufficient buoyancy to cause the structure to float - It can be moved from place to place; can be ballasted up or down by altering the amount of flooding in buoyancy tanks; they are generally anchored by combinations of chain during drilling and/or production operations, though they can also be kept in place by the use of dynamic positioning. - Semi-submersibles can be used in water depths from 200 to 10,000 feet. 14
  15. 15. 7. FPSO - FPSOs are large ships equipped with processing facilities and moored to a location for a long period. - The main types of floating production systems are: • FPSO (floating production, storage, and offloading system) • FSO (floating storage and offloading system) • FSU (floating storage unit). 15
  16. 16. 16
  17. 17. 8. SPAR Platform • A spar is a type of floating oil platform typically used in very deep waters, and is named for logs used as buoys in shipping that are moored in place vertically. • A spar platform consists of a large diameter, single vertica cylinder supporting a deck. The cylinder is weighted at the bottom by a chamber filled with a material that is denser than water to lower the center of gravity of the platform and provide stability. Spars are anchored to the seabed by way of a spread mooring system with either a chain-wire-chain • 10 000 ft 17
  18. 18. 9. Subsea system 18
  19. 19. B. Facilities of Offshore Platform - Wellhead Platform - Process Platform - Platform Complex 19
  20. 20. 1. Wellhead Platform (WHP) - A wellhead platform includes an integrated deck, utility systems, wellhead systems, living quarters, a helideck and drilling facilities. - WHPs are normally unmanned. They are designed to be operated remotely and visited during routine inspection and maintenance activities. 20
  21. 21. 2. Process Platform - Separation (Oil, Gas and Produced water) - Gas Compression & dehydration - Produced Water Conditioning - Sea water processing & injection system 21
  22. 22. 3. Platform Complex Ekofish Complex 22
  23. 23. III. Crews • OIM (offshore installation manager) is the ultimate authority during his/her shift and makes the essential decisions regarding the operation of the platform. • Operations Team Leader (OTL) • Offshore Operations Engineer (OOE) is the senior technical authority on the platform • PSTL or Operations coordinator for managing crew changes • Dynamic Positioning Operator, navigation, ship or vessel maneuvering (MODU), station keeping, fire and gas systems operations in the event of incident • 2nd Mate ‐Meets manning requirements of flag state, operates Fast Rescue craft, cargo ops, fire team leader. • Ballast Control Operator also fire and gas systems operator • Crane operators to operate the cranes for lifting cargo around the platform and between boats. • Scaffolders to rig up scaffolding for when it is required for workers to work at height. • Coxwains for maintaining the lifeboats and manning them if necessary. • Control room operators ‐Especially FPSO or Production platforms. • Catering crew will include people tasked with performing essential functions such as cooking, laundry and cleaning the accommodation. • Production techs for running the production plant • Helicopter Pilot(s) live on some platforms that have a helicopter based offshore. The helicopter flight crew transports workers to other platforms or to shore on crew changes. • Maintenance technicians (instrument ,electrical ,mechanical ) 23
  24. 24. IV. SCADA - SUPERVISORY CONTROL AND DATA ACQUISITION - Gather necessary DATA from a REMOTELY LOCATED Oil/Gas well and Well Platform with the help of Field Transmitters & RTU and send it to the DATA GATHERING & ANALYSIS point. Sensor at well platform RTUs, PLCs Computer Actuator at well platform SCADA schematic Pressure Temp Lever… Valve Pump… CPU Monitor Server 24
  25. 25. SCADA Management 25
  26. 26. Benefit of SCADA • 24 hrs online monitoring control from onshore center • Historical Data and trending helps in Troubleshooting • Ability to close wells remotely during emergency. • Better Production optimization of individual wells • Instant alerts in case of Well closures, ESD, FSD and control panel failure • Optimum utilization of Manpower for attending to well problems • Reduction in number of physical visits to well platforms resulting in optimization of Helicopter sorties. • To observe slugging in pipelines. • Lift gas allocation for each well 26
  27. 27. V. FIRE AND EXPLOSION PROTECTION - Unpredictable - Cause: Human and Natural Disater  - Fire & Explosion Protection - Risk Management 27
  28. 28. - Emergency Shutdown (ESD) system + Levels of Shutdown + Isolation Valve Requirements - Depressurization, Blowdown and Venting 28
  29. 29. Fire Detection & Suppression System Detection system - Gas Detection - Fusible Plug - Fire Detection - Smoke Detection - Heat Detection Suppression system - Fire water pump - Water Sprinkler - Dry Chemical - CO2 Extinguisher - AFFF SYSTEM Escape / Abandon - Scape Ladder - Scramble Net - Life Ring - Life Raft - Life Boat - Jumping Rope 29
  30. 30. VI. Environment Protection 30
  31. 31. 31 Contact: minha4k47@yahoo.com.vn

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