Subsea Surveying, Positioning, and Foundation · precisely the nature and mechanical properties of soils at the selected subsea field area and along the onshore and offshore pipelines

Subsea Surveying, Positioning, and Foundation

/chesssubseaengineering /chesssubseaengineering

Presented by

Oseghale Lucas Okohue BEngr. Msc. CIPMP

www.chesssubseaengineering.com

Course Instructor

Name: Oseghale Lucas Okohue

Position: Subsea Engineer – Production Systems | Drilling Systems Specialist

Website: www.chesssubseaengineering.com

Email: [email protected]

[email protected]

Phone: 08139340494



Outline


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


Outline


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


Outline


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


Outline


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





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.



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.



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;



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;



Course Overview

Determining the type of subsea foundation design that is normally used for

subsea field development.


Email: [email protected]


Documents

Subsea Surveying, Positioning, and Foundation · precisely the nature and mechanical properties of soils at the selected subsea field area and along the onshore and offshore pipelines