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Annual Report 2015

Subsea gate box

Project manager Prof.

Sigbjørn Sangesland

Postdoc, Mariana Diaz

Different wells in a subsea field have different

production capacities, production constraints

and production targets dictated by the reservoir

depletion strategy. Therefore, they are subject

to individual management and control. However,

commingling the production streams of the indi-

vidual wells, creates a strong interdependence

of the flow rates and production pressures of the

individual wells. The results of this interdepend-

ency is that the yield of the integrated system is,

most often, considerably sub-optimal.

This project explores new facilities and system

configurations to achieve efficient and optimal

management of the integrated system over the

entire life of the field.

A central element of the project is the concept

development of a modular and multi-functional

assembly to allow easy re-routing of well streams

and a quick and easy deployment of separation

and boosting capability to a single well, to a group

of wells or to the entire cluster.

This subsea assembly named Subsea gate box

is configured as a template that accommodates

individual well modules and compartments,

containing proper process equipment (Figure 3).

The process equipment may include separators,

pumps, compressors, control valves and/or flow

meters, according to the characteristics of the

well stream. A task in the early phase of the project

(Figure 4), will be to identify the leading technology

in the market that suits best to a compact and

modular solution. The project deliverables will

include a description of the state-of-the-art sub-

sea process technology, feasibility analysis of

the Subsea gate box and performance analysis

of business cases designed for both conventional

and low-energy oil fields.

Co-supervisor, Professor

Emeritus Michael Golan

Co-supervisor, Associate

prof. Milan Stanko

Postdoc, Jesús De Andrade

Subsea gate box

Different wells in a subsea

oil

field have different production capacities, diffe

production constraints and different production targets dictated by rese

ma agement. Therefore, they are subje t to individu l management and con

However, the cluster nature of the field,

commingling the production streams of the

in ividual

wells,

creates

a

stro g

interdependence of the flow rates and

production pressures of the individual wells.

Thus, as the wells are producing in a network, a

change in operating conditions of one well,

affects all other wells in the cluster and

cons quently the total network outcome. The

results of this interdependency is that the

production rate of the integrated system is,

most often, considerably sub-optimal.

This project explores new facilities and system

configurations, as well as novel strategies to

achieve efficient and optim l management of the integrated system. This include

optimization over the entire life of the field, accounting for the considerable cha

in production conditions associated with the reservoir recovery process.

In hort, the challenge in the project is to optimise the recovery and revenue fro

asset by managing the interdependencies between the wells.

The project will identify and evaluate the feasibility and the implication of variou

subs a systems architecture alternatives. A central element of the project is the

development of a modular and multi-functional assembly to allow easy re-routin

well streams and a quick and easy deployment of separation and compression

capabilities to a single well, to a group of wells or to the entire cluster. The assem

named Subsea gate box will be configured to account for all the default demands

modern subsea process equipment, including; compactness, robustness, ease of

deployment and integration in the entire system and ease of operation.

The Subsea gate box is configurable as a template that can accommodate individ

well modules and compartments, containing process equipment (

Figure 3

). The

process equipment may include separators, pumps, compressors, control valves

or flow meters, according to the characteristics of the well stream. A task in the e

phase of the project (

Figure 4

) will be to identify the leading technology in the

market that suits best to a compact and modular solution. The project deliverabl

will include a description of the state-of-the-art subsea process technology,

feasibility analysis of the Subsea gate box and performance analysis of business c

designed for both conventional and low-energy oil fields.

Figure 3. Subsea Gate Box concept sk

Co-supervisor,

Professor Emeritus

Michael Golan

Co-supervisor,

Assoc. Professor

Milan Stanko

Postdoc,

Jesús De Andrade

Postdoc,

Mariana Diaz

Project manager

and main

supervisor,

Prof. Sigbjørn

Sangesland

Subsea Gate Box

Assessment

Literature review

Gathering

information from

industry

Scientifics

journals and

conferences

State-of-the-art

Concept

development

Alternatives

system

architecture

Define system

Modular

interconnectivity

Module flow

path diagrams

Computational

tools evaluation

Analysis

Evaluate

feasibility

Pros and cons

Testing

Low energy oil

field

Conventional

offshore oil field

Figure 4. Subsea Gate Box project activities

Well

1

Well

2

Well

3

Gas

liquid

MANIFOLDS

Choke

Boosting

Separation

and Metering

Separation

Choke

Choke

Boosting

Separation

and Metering

Separation

Module

Well 3

Figure 3. Subsea Gate Box concept sketch