1 Introduction

1.1   Scope

In the life cycle of a project, the field development architecture and development strategy stage includes the greatest potential to impact the profitability of deepwater offshore fields.

This stage includes the following activities:

  • Create reservoir models

  • Select surface development concepts

  • Select sub-surface development concepts

  • Select the export system for the produced fluids and gas

  • Perform safety evaluation

  • Perform economic evaluation

The field architecture activity regroups the sub-surface and surface development concepts.

The purpose of this document is to review the tools and technologies available to define the possible configurations for a field development in terms of type of wellhead (i.e. subsea or surface trees), floaters, export systems, flowlines and SPS arrangements, etc., and to highlight the associated limitations, advantages and disadvantages.

This report commences ( Chapter 2, Field Development strategy) with a presentation of some project development strategies, which were recently applied with the purpose of minimising the cost of field development. It also includes a flow chart which is an attempt to provide an overall view of available ‘tools’ and technologies as part of the field architecture definition.

The Chapter 3, Floater and Development concept Selection deals with the field development concept selections. It presents the different available choices in term of production floater and related equipment (e.g. export system). The section also deals with the development nature, i.e. the pros and cons of a subsea development versus a surface tree based floater.

The possible subsea architectures for the wellheads are presented in Chapter 4, Well Architecture . This includes individual satellite wells and grouped wells, which may be in cluster or template configuration.

The flowline subsea architectures are described in Chapter 5, Flowline System Architecture , presenting in particular the single flowline versus the dual 'looped' lines configuration for the production system, including the technical issues related to these architectures.

The Chapter 6, Subsea Processing and Active Lifting summarises the available ‘subsea processing’ technologies and reviews the reasons and incentives for their applications in oil and gas reservoirs developments

1.2   Codes, Standards, Specifications and Reference Documents

1.2.1   Deepwater Reference Books

1.3   References

This study is based on the following sources

  • Industry available documentations, e.g. conference papers, publications, brochures

  • In house technical data and past experience in field architecture and systems design

1.4   Acknowledgements

We wish to thank the E&P companies, contractors, manufacturers for the provision with courtesy of technical information and photographs.

1.5   Definitions & Abbreviations

1.5.1   Definitions

1.5.2   Abbreviations

API

American Petroleum Institute

Bcf

Billion cubic feet

BOP

Blow Out Preventer

bpd

barrel per day

CALM

Catenary Anchor Leg Mooring

CAPEX

Capital Expenditure

CDT

Cool Down Time

EDP

Emergency Disconnection Package

EDP

Emergency Depressurizastion

EDP

Extended Draft Platform

EPS

Early Production System

EWT

Extended Well Test

FLET

Flowline End Termination

FPDSO

Floating Production Drilling Storage and Offloading

FPSO

Floating Production Storage and Offloading

FSU

Fluid Sampling Unit

FSU

Floating Storage Unit

FTL

Fluid Transfer Line

GOR

Gas Oil Ratio

GOM

Gulf of Mexico

HAT

Hydrate Appearance Temperature

ILT

In-Line Tee

IPB

Integrated Production Bundle

IPB

In Plane Bending

LMRP

Lower Marine Riser Package

MMboe

Million barrels of oil equivalent

MMcf

Million cubic feet

MODU

Mobile Offshore Drilling Unit

MPP

Multi-Phase Pump

OLS

Oil Loading System

OPEX

Operational Expenditure

PIP

Pipe in Pipe

PiP

Pipe-in-Pipe

PU

Production Unit

PU

Pump Unit

SCR

Steel Catenary Riser

SHR

Single Hybrid Riser

SPS

Subsea Production System (i.e. subsea structures such as X-mas trees, manifolds, etc.)

SSP

Sevan Stabilized Platform

STTR

Single Top Tension Riser

SWHP

Surface Wellhead Platform

TLP

Tension Leg Platform

UFL

Umbilical and Flow Lines

WAT

Wax Appearance Temperature

WOA

West Of Africa