AOG 2015 - Pulse - Acoustic system to monitor wellhead

www.pulse-monitoring.com

AOG 2015Acoustic System to Monitor Wellhead Fatigue in Real-time

March 12th 2015


• Monitoring method currently used

• Online monitoring

• New generation wireless monitoring

• Benefits of active monitoring

• Other applications

Agenda


Improve operational efficiency

Asset life extension

Design verification

Understanding for future

improvements

Enhance operational

safety

Proactive integrity

management

To quantify the unknown

Asset life extension

Greater understanding of asset fatigue history

• Greater understanding of asset fatigue history

• Reduced stress on critical riser components

Improve operational efficiency

• Optimizing inspection andmaintenance strategies

• Improved decision making and longer operating windows

Understanding for future

improvements

• Provides historical record of structural performance

• Identify anomalies/ errors in design, installation, operation etc

3

Design verification


• Validate riser performance against design

• Reduce conservatism in analysis through the use of real world data

Enhance operational

safety


• Understanding how much fatigue is being accrued over the length of the operation

• Reduction in unplanned incidents

Proactive integrity

managementGreater understanding of

asset fatigue history

• Adhere to industry regulations and standards

• Protect individual and corporate reputation

Why Monitor ?



Divider SlideMonitoring Method Currently Used


Standalone Method

• 1 Vessel logger for vessel motion

• 5-10 Riser data loggers to identify VIV

mode

• 1-2 BOP / LMRP / guide base data

loggers for BOP displacement – wellhead

/ conductor fatigue

Standalone - ROV Retrievable


Standalone Method

• Method is highly reliable but has some limitations:

– No data available for real time decision making

– Powered by batteries which restrict logging campaign length and frequency of data collection

– Data availability dependent on ROV’s ability to dive

Overview and Limitations


Divider SlideOnline Monitoring

ROV connector plate

Hardwired motion logger

•Hardwired motion logger attached to rigid section of BOP or LMRP whilst topside•Logger wired to ROV connector plate using subsea cable

Guide wire 1

Subsea cable

•BOP installed using 4 guidewires•After installation one guidewire (guidewire 1) remains in place

•Subsea cable strapped to guide wire 2 lowered along guide wire 1•The guidewire is hooked onto the pre‐installed steel rope loop •ROV plugs the connector into the ROV connector plate•The monitoring system is now fully operational with BOP motions visible in real time from the rig

Guide wire 2 hooked to LMRP

Subsea cable plugged into ROV connector plate


Divider SlideNew Generation Wireless Monitoring


Wireless Monitoring

• Wireless transfer of data

• Data available on demand

• Installation can be done via ROV - does not interfere with rig

operations

• Only useful information is transmitted

• Greater than 6 months battery life

Overview


Wireless MonitoringAcoustic System Overview

• 1 Deployment Frame

• 1 Acoustic Receiver

• 1-2 Subsea Data Logger


Wireless Monitoring

Acoustic Receiver

• Dunked over the side

• Through the moonpool

• I-tube deployment

• Using existing hipap

• Using existing LBL array

Dunking Modem10m below MSL

Winch + subsea cable

Topside cable to Laptop


New Generation Wireless Monitoring

Motion Logger

INTEGRIpod strapped to BOP

Acoustic Transmitter

• Motion Logger

• Acoustic transmitter

• Both strapped to BOP

• Outrigger may be required


Wireless Monitoring

Acoustic Technology

• Can travel 3000m+ through water

• Can work in noisy DP environment

• Doesn’t affect other signals

• Requires line of sight


Wireless Monitoring

Why is this technology available now ?

• Advances in Technologies – Low power computation

– Faster data processor/microcontroller

– Larger memory capacity

– Reliable technology

• Advances in acoustic technology– Confidence in the systems


Benefits of Active Monitoring



• Aid Drilling Operations through active near real time monitoring data:

– Differential lower flex joint angles

– BOP movement and vibration

– Riser modes and shape

– Bending loads on conductor

– Tension at riser adaptor

Ability to Make Real-time Decisions



All parameters within normal

operating limits

1 parameter outside normal operating limits

> 1 parameter outside ultimate operating limits

Optimise JudgementAction Required

RecommendedDisconnect

GREEN AMBER REDSTATUS

SITUATION

ACTION

• Traffic Light Alarm Functionality



Data in Real-time



Overview

• Data available for real time decision making

• Near elimination of data screening and processing activities

• Reduced intervention cost through improved logging duration

– Offshore personnel or ROV intervention

• Real-time feedback of riser analysis model

• Part of IM strategy - Advanced warning to prevent from a catastrophic

failure

• Increases efficiency and can save costs



• Up to 9 days from disconnect to return to drilling operations• Rig daily cost $250k to $1M• Possible savings: $2,25M to $9M

Rig Time Saving

0

20

40

60

80

100

No Monitoring Monitoring

Time to Drill a Well

Drilling Run Casing Maintenance Run Riser Test BOP

97 Days 88 Days



Rig Time Saving

• Monitoring daily cost $500 to $2,000 (depending on configuration)• Less than 0.1% of operating costs

Cost of Monitoring

Rig Costs

Cost Comparison

Cost of Monitoring Rig Costs



Comparison of methodologies

Pros ConsStandalone Lowest cost

Simple to install No real time data High requirements on ROV

Wireless Near real-time communications for operational decision making

Improved Real-time fatigue calculation Battery/memory typically longer

than drilling campaign – so no ROV requirement

Still requirement for dunking modem

Online Wired Fully real time data No bandwidth restriction No issues with power/memory

management

Higher costs (especially in deeper water)

Cable management Difficult to repair/service once

deployed


Divider SlideOther Applications


Other Applications

• Flexible riser global response• Pipelines VIV and slugging • Export Line from a fixed platform• Mooring Lines

The wireless data logger can also be used in monitoring


• Less Intervention = lower operations cost and risk

• Lower risk through improved safety features

• Provide near real time integrity data• Vital for making operating decisions

in real time

Summary

Acoustic Monitoring

Documents

AOG 2015 - Pulse - Acoustic system to monitor wellhead