dnv-rp-f302 on subsea leak detection systems...dnv-rp-f302 on subsea leak detection systems november...

Kristin Nergaard Berg

November 3rd, 2011

DNV-RP-F302 on Subsea Leak Detection Systems

OLF Subsea leak Detection Seminar

© Det Norske Veritas AS. All rights reserved.


November 3rd, 2011

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November 3rd, 2011

Agenda

Background – DNV-RP-F302 Background, objective & scope

Detection principles - overview

Case: Leak detection philosophy, Talismans Yme field

Engineering and management of leak detection systems



November 3rd, 2011

Background – DNV-RP-F302

Developed through a joint industry project (JIP) involving ConocoPhilips, ENI,

Shell, Statoil, OLF (The Norwegian Oil Industry Association) and DNV

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Statistics ExproSoft

Technology

screening SINTEF

Lab test SINTEF

DNV-RP-F302 JIP/DNV

Future ?



November 3rd, 2011

Objective of the RP

Summarize industry experiences and knowledge on SLD

Be a technical and practical guideline and reference

However, not a ‘recipe’, leak detection strategy and engineering is field specific

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November 3rd, 2011

Scope – DNV-RP-F302

Hydrocarbon leaks (oil and gas)

Continuous monitoring with access to control system and topside warning

Coverage of templates and manifolds

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November 3rd, 2011

Detection principles - categories

Point sensing

Area covering

Mass Balance

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November 3rd, 2011

Detection principles - Point sensing

Bio-sensors

Capacitance

Fluorescent detectors

Methane sniffers

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November 3rd, 2011

Detection principles - Area coverage

Active acoustic

Optical cameras

Passive acoustic

Fibre optics

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November 3rd, 2011

Detection principles - Mass balance

Based on established technologies

Monitors pressure drop / loss of flow

~5% of total flow

Better accuracy at high flow rates

Complimentary technology to the younger, more accurate detection principles

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November 3rd, 2011

Case: Leak detection philosophy for the Yme field

Review of authority and company requirements

Review of practices and guidelines existing in the industry

Environmental Risk Assessment

Recommendation of applicable technologies for the different system zones,

considering detection time and sensitivity

Performance description of the total leak detection system, considering involved

technologies

Management plan for the leak detection system

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November 3rd, 2011

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Integration into subsea management

procedures

Interface to control, power and mechanical

- Authority and corporate requirements

- HSE Risk analysis



November 3rd, 2011

Combining technologies

Maturity of leak detection technologies today: Not safety system

Combining technologies to improve system performance:

Area coverage and point sensor

Detection capabilities for oil and gas

Redundancy regarding measurement principle, compensating respective

weaknesses

Enabling indication of a leak event from one sensor type to be confirmed by positive

indications from another sensor type

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November 3rd, 2011

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WARNING!

The capacitance sensor at

well xyz indicates a leak Hmm..let’s check what the

acoustic sensor covering the

whole template says

That is strange. Acoustic

sensor says normal

operation

This is from the

control room. We

have an indication

of a leak and need

an ROV to do a

check-up



November 3rd, 2011

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WARNING!

The ROV inspection did not

find any indication of

leakages

All the critical components

were checked. I will disable the warning….. …and record and report the

incident



November 3rd, 2011

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Warning

from

detector 1

Check

detector 2 Record

Initiate

predefined

actions

YES

Disable

warning

NO

Further

checks

(ROV)

YES Initiate

predefined

actions

Record

NO

Record

Periodically

improve

procedures

from lessons

learned



November 3rd, 2011

Detect-Confirm-Act

Warning in control room

Operator checks if warning is real or false

Procedures and preparedness plan defines what to do and who to inform

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November 3rd, 2011

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Safeguarding life, property

and the environment

www.dnv.com

[email protected]

http://www.dnv.com/

dnv-rp-f302 on subsea leak detection systems...dnv-rp-f302 on subsea leak detection systems november...

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