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Subsea Surveying, Positioning, and Foundation
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Presented by
Oseghale Lucas Okohue BEngr. Msc. CIPMP
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Course Instructor
Name: Oseghale Lucas Okohue
Position: Subsea Engineer – Production Systems | Drilling Systems Specialist
Website: www.chesssubseaengineering.com
Email: oseghaleokohue@chesssubseaengineering.com
oseghaleokohue@gmail.com
Phone: 08139340494
www.chesssubseaengineering.com
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Outline
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Lecture 2: Subsea Survey Requirement
Lecture 1: Introduction
- Survey Pattern for Selected Subsea Field and Each Pipeline Route
- Geotechnical Study
- Survey Vessel
- Survey Aids
- Gyrocompass
- Navigation Computer and Software
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Lecture 3: Subsea Survey Equipment Requirement
- Multibeam Echo Sounder (MBES)
- Side-Scan Sonar
- Sub-Bottom Profilers
- Magnetometer
- Core and Bottom Sampler
Lecture 4: Positioning Systems
Lecture 5: Acoustic Long Base Line
Lecture 6: Acoustic Short Baseline and Ultra Short Baseline
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Lecture 7: Subsea Soil Investigation
Lecture 8: Subsea Survey Equipment Interface
- Offshore Soil Investigation Equipment Requirements
- Seabed Corer Equipment
- Piezocone Penetration Test
- Sound Velocity Measurement
- Sediment Handling and Storage Requirements
- Onboard Laboratory Test
- Core Preparation
- Onshore Laboratory Tests
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Lecture 9: Subsea Foundation
- Pile- or Skirt-Supported Structures
- Seabed-Supported Structures
- Pile and Plate Anchor Design and Installation
- Basic Considerations
Lecture 10: Geotechnical Capacity of Suction Piles
Lecture 11: Geotechnical Capacity of Plate Anchors
Lecture 12: Structural Design of Suction Piles
Lecture 13: Installation of Suction Piles, Suction Caissons and Plate Anchors
Lecture 14: Driven Pile Anchor
Lecture 1: Introduction to Subsea Survey, Positioning & Foundation
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Introduction
The study of the subsea soil, including the subsea survey, positioning, soil
investigation, and foundation, is one of the main activities for the subsea
field development.
The purpose of the survey is to identify:
potential man-made hazards,
natural hazards, and
engineering constraints
These are all vital when selecting a subsea field area and also flowline
construction.
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Introduction
to assess the potential impact on biological communities;
to determine the seabed and sub-bottom conditions.
Other reasons includes:
This course provides minimal functional and technical requirements for the
subsea soil issue, but these guidelines can be used as a general reference to
help subsea engineers make decisions.
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Course Overview
This chapter briefly explains these topics:
Establishing vertical route profiles, a contour plan, and the seabed
features, particularly any rock outcrops or reefs;
Obtaining accurate bathymetry, locating all obstructions, and identifying other
seabed factors that can affect the development of the selected subsea field area
including laying, spanning, and stability of the pipeline;
Carrying out geophysical survey of the selected subsea field and route to define
the shallow sub-seabed geology;
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Course Overview
This course briefly explains these topics:
Carrying out geotechnical sampling and labouratory testing in order to evaluate
precisely the nature and mechanical properties of soils at the selected subsea
field area and along the onshore and offshore pipelines and platform locations;
Locating existing subsea equipment (example: manifold, jumper, and subsea
tree),pipelines and cables, both operational and redundant, within the survey
corridors;
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Course Overview
Determining the type of subsea foundation design that is normally used for
subsea field development.
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Email: info@chesssubseaengineering.com
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