Offshore Fixed Platform Project & Design Phase

Bài viết cung cấp cho AE các bước và bài toán cơ bản của một bộ hồ sơ thiết kế công trình biển, tùy từng giai đoạn của dự án sẽ có những report cần thiết kèm theo.
In oil and gas industry, there are some significant different between civil infrastructure and oil and gas infrastructure. Typically, in oil and gas, it consists of several project phases which are:
Phase 1 : Appraisal, to develop Plan of Development (POD) after exploration activities (drilling and geophysical surveying)
Phase 2 : Front End Engineering Design (FEED) or Concept Selection.
In this phase, Company will involve following steps in all disciplines of project such as process, mechanical, electrical, instrumentation in addition to structural engineering. Sometime, it is known as preliminary design. During this phase, Company will perform several activities as follows:
- Collection process data and identifying needs and equipment.
- Preliminary equipment sizing and area requirements
- Weight estimation based on past projects
- Identification of structural configurations
- Preliminary estimation of structural weight
- Identification of installation methods
The data collected during FEED will be further verified to make sure the authenticity and reliability of such data for further use. A Design Basis will be developed for the proposed facility.
Phase 3 : Engineering, Procurement and Construction (EPC). D
etailed design of offshore platform will be initiated once the basic design confirms the economic viability and technical feasibility. In the detailed design/engineering of an offshore platform following items of the jacket and deck will be developed in detail, such as: framing plans, framing elevations, joint details, plate girder details, pile make-up, appurtenances, etc.
The following detailed design analysis as minimum should be carried out:
- Inplace
- Loadout
- Sea transportation
- Lifting
- Free floatation
- Upending
- Dynamic
- Fatigue
- On Bottom Stability
- Pile Driveability
- Ship Impact
Pre-commisioning and commisioning will commence once the facility are installed at offshore prior to hand over to the Company.
Phase 4 : Operation.
In this phase, all activities are taken care by Company.
Phase 5 : Abandon.
The entire facilities should be abandoned once the field has not sufficient to produce much hydrocarbon and the service life of the facilities are ended.

 

Cảm ơn bạn Admin nhưng những nội dung bạn nêu chỉ phù hợp với một dự án wellhead platform thôi. Và cũng xin bổ sung một số tính toán trong giai đoạn thiết kế FEED/Detailed Engieering nữa là:
- Launch Analysis (nếu thi công jacket bằng launching)
- Dynamic Lift Analysis (if needed)
- Seismic Analysis (if needed)
- Pushover Analysis (as required)
- Miscellaneous Calculation (rất nhiều thứ)
- Conductor Design/Driveability Analysis

 

Chia phase như đề cập ở trên nói chung là ổn, như nếu chia bài toàn tính toán thì khác đấy nhé. Ví dụ:

Fixed Structures – Jacket Design

• In-Service Analysis
  In-place analysis, Seismic Analysis, Fatigue Analysis, Dynamic analysis (if req.), Ship Impact Analysis, Pushover, Collapse Analysis (as req.), Cathodic Protection Design
• Pre Service Analysis
  Loadout Analysis, Tow Analysis, Launch/Lift Analysis, Floatation Analysis, Up-ending Analysis, On Bottom Stability and Mudmat Design etc.
• Miscellaneous Design
  Jacket appurtenances, Riser clamps, Cathodic protection, Vortex shedding, Wave slam, Padeye/Trunnions, Connections, Sea fasteners

Fixed/Floating Structures – Deck/Module Design

• In-Service Analysis
  In-place Analysis, Seismic Analysis, Fatigue Analysis, Equipment Skid Design, Modular Support Frame, Helideck design
• In-Service Analysis
  – Loadout Analysis, Tow Analysis, Offshore lift analysis
• Miscellaneous Design
  Equipment/Pipe support, Access platforms, Vortex shedding, Padeye/Trunnions, Connections, Dropped Object Protection structures

Foundation Design

• Foundation Design
• On-bottom Stability, Mudmat Analysis, Design of Anchor Piles, Drilled & Grouted Piles
• Miscellaneous Structural Design

 

Am em công trình biển cứ từ từ nghiên cứu làm nhuần nhuyễn các bài toán đã nêu trên, sử dụng tốt các phần mềm phân tích tính toán (SACS hoặc SESAM, MOSES, ... ) là làm chủ được phần E rồi đó, có gì khó khăn đâu nhỉ?

Tôi đã đọc và tìm các tài liệu thiết kế về CPP, WHP, .... của Technip, Worley Parsons, JV Kendy, McDermott, MMS thì cũng như thế cả thôi, không có gì nhiều hơn. Nếu chưa có dự án mới thì anh em có thể tranh thủ thực hành bằng cách tính lại và làm báo cáo như các công ty này để kiểm tra và đối chiều kết quả. Nếu có gì vướng mắc đưa lên diễn đàn cùng trao đổi - học hỏi.