[Offshore Platform Maintenance]

By

ACKNOWLEDGEMENT

I would take this opportunity to thank my research supervisor, family and friends for their support and guidance without which this research would not have been possible.

DECLARATION

I, [type your full first names and surname here], declare that the contents of this dissertation/thesis represent my own unaided work, and that the dissertation/thesis has not previously been submitted for academic examination towards any qualification. Furthermore, it represents my own opinions and not necessarily those of the University.

Signed __________________ Date _________________

ABSTRACT

This paper describes a risk-based maintenance management system for protective coatings and how it might influence offshore maintenance processes. Maintenance of protective coatings is one of the more resource-demanding and, hence, costly operations on offshore installations. On older platforms, typically about 5% of all man-hours are related to coating maintenance (including scaffolding). The cost is strongly influenced by initial coating system selection and maintenance strategy, together with the required lifetime. A new, risk-based maintenance management system is being developed, and Part 1 of this series discussed the risk analysis methodology. Parameters influencing the risk related to coating maintenance have been identified, and a framework for control and monitoring of these parameters has been established. This framework aims to optimize component maintenance and inspection programs through risk evaluations, and may affect:

Inspection methodology and intervals,

Priority-assignment during maintenance,

Coating selection, and

Follow-up of suppliers and contractors.

TABLE OF CONTENTS

ACKNOWLEDGEMENT2

DECLARATION3

ABSTRACT4

CHAPTER 1: INTRODUCTION6

CHAPTER 2: LITERATURE REVIEW8

Historical development8

Geology and the sea9

Mobile drilling platforms11

Self-elevating platform11

Submersible platforms12

Semisubmersible platforms13

Floating drill ships13

Production and Well-Completion Technology15

Hazards At Sea18

Major Components Of Cost18

Development Program19

Selecting The Number Of Wells20

Major Components Of Cost21

Costs And Duration Of Production21

Legal And Practical Restrictions23

Drilling Unit24

Pool Unitization24

CHAPTER 3: METHODOLOGY26

Exploitation Practices26

Factors Of Method Selection26

Aspects Of Production Rate27

Field And Reservoir Conditions27

Market And Regulatory Factors27

Useful Terminology28

Porosity28

Permeability28

Productivity index28

Barrel29

API gravity29

Viscosity Range29

CHAPTER 4: RESULTS AND ANALYSIS31

A Risk-Based Maintenance Management System31

From Concept and Definition to Installation31

Operation and Maintenance35

Disposal38

A New Framework For Maintenance Management38

From Concept and Definition to Installation38

Operation and Maintenance40

Disposal48

CHAPTER 5: CONCLUSION50

REFERENCES52

CHAPTER 1: INTRODUCTION

This paper discusses challenges related to the introduction and implementation of a risk-based maintenance management system for protective coatings. Today, selection, application, and maintenance of protective coatings within StatoilHydro ([Stavanger, Norway] hereafter referred to as the Company) is performed according to NORSOK M-501 and additional Company specific requirements. Adding risk-based evaluation criteria to the functional/visual maintenance strategy of today requires a risk analysis methodology. The risk analysis was discussed in Part 1 of this series. The overall objective of the maintenance management system is to ensure that corrosion protection is applied and maintained in a safe and economical manner throughout the installation's life span. Based on risk evaluations and additional functional requirements, a set of acceptance criteria for coating performance is established. This set forms the framework for any economical analysis. Both the risk management and the economical analysis should consider the entire lifetime of the offshore installations. This includes all life cycle phases from “concept and definition” to “disposal.”Traditionally, surface technology has not been widely considered in the early phases of a project, and for existing installations a new maintenance management system will only affect the “operation and ...