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Scanning in Explosive

Environments Oshore

* Image courtesy o H-L-Andersen

Company

overviewZoller + Frhlich is the world leader inthe manuacture o phase based laserscanners.

Our strengths lie in our powerul 3Dlaser scanning hardware and sotwareinnovations which are regarded as thebest in the market, the continual natureo these innovations and the supportthat we show to our customers who

are loyal and longstanding owing to theservice we provide.

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Ramboll Oil & Gas have been inpartnership now since taking their frstZ+F IMAGER in 2010.

Ramboll Oil & Gas delivers engineeringconsultancy services to the Oil and Gasndustry. As part o the consultancyservice, Ramboll Oil & Gas has a 3DScanning and Survey department,which is based in Esbjerg, Denmarkand perorms 3D scanning and survey,both oshore and onshore.

The 3D scanning is used as as-builtdocumentation in a design process.

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Previous case studies have highlighted the act thatengineers working in oshore environments are taking

huge risks, and this exercise has now proven to be oneo the most difcult and technical o all.

Consequently, operating a scanning process inhazardous environment can constitute a verydifcult task or them :

difcult access to the rigs very little space to manoeuvre the

equipment highly unpredictable weather

conditions etc. ...

Finally, one o the other aspects which makesthe scanning process an even greaterchallenge is the act, that engineers may beoperating in a highly explosive environment.

Only experienced proessionals are qualifedenough to defne a potential explosiveenvironment. However, various sourcesdefne an explosive atmosphere as an areawhere the risks o gas emissions are high.Explosive proo environments always occur

when drilling oshore.

This case study ocuses on the challengesand opportunities that are related to scanningin these hazardous environments.

Background

* Image courtesy o H-L-Andersen

Case Study

Ramboll - Z+F

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Brie

Scope

1. Petroleum geology o the North Sea: basic concepts and recent advances, by K. W. Glennie

2. www.maerskoil.com

Tyra

Fig. 1 BubbleView o the Tyra East

It is almost impossible to conduct a survey in hazardousenvironments with traditional scanning and surveyingequipments, due to the high explosive risk.

Certain conditions are likely to cause operational difculties, and this requires extremecare and preparation: sometimes, it is even necessary to use explosion proo scanningand survey equipment.

A scanning project was perormed by Ramboll on Tyra East, a Maersk Oil platorm in the

Danish part o the North Sea. The scope o the work was:

Maersk Oil wanted to install gas lift on 4 wells on Tyra East Design for gas lift system were performed by Ramboll Oil & Gas Qatar Laser scanning was requested to ensure complete as-built documentation of

existing layout on Tyra East Platorm B

Tyra Field is regarded as the largest gas condensate feld in the Danish Sector o theNorth Sea1. Tyra Field has two production complexes named Tyra West and Tyra East(which the case study will ocus on), connected by pipelines.It is operated by Maersk. Tyra East is the main gas export hub to Denmark, accountingor 90 percent o the DUC gas production2.

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Introduction

Scanning in explosive environment

Ramboll Oil & Gas based in Esjberg, Denmark were awaredthis major contract to scan the platorm.

The area was highly explosive due to active drilling in thelocation, which meant it had to use highly sae and modern

3D laser scanning techniques in order to capture, in high res-olution, the as-built environment or urther remedial works.No existing data was available due to its hazardous area clas-sifcation.

The resultant data will be used to aid urther investigationand modifcations to the platorm. It will also oer the clientaccurate records o the as-built environment or the frst timein digital ormat.

Ramboll

20thApril2010

Surveyordered

7th-11thMay2010

Offshorescanning

17th-21stMay2010

Dataprocessing

2ndJune2010

Delivery

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Methodology

nstruments and Software

The IMAGER 5006 EX was used dueo the act that it is the worlds only

explosion proo 3D laser scanner. This

scanner is developed in cooperationbetween Z+F GmbH and DMT GmbH &Co. KG.

The LFM sotware package was alsoused or the orientation o the scans,modeling o tie-in points and generatingo the NetView solution.

Data collection & processing

Due to great complexity in the areahat had to be scanned, 49 scans were

perormed within an area o 15x15meters and on two decks (see Fig. 2,Right). Since the IMAGER 5006 EX is aphase based scanner, each scanningonly took approximately our minutes.This scanner can also interace withLFM sotware standard tools or dataevaluation.

Challenges

The orientation o the scans was the frst

obstacle to encounter when working inan explosive environment. Normally thescans are oriented by targets, surveyedwith a total station and calculated inhe platorms module system. But no

explosion proo total station is currentlyavailable and it was necessary to use adierent method.

Using Bundle Adjustment

The orientation o the scans wasperormed in two steps. Targets weredistributed within the area as normal

and ollowing standard with minimumfve targets visible in each scan.

In step one all scans were orientatedaccording to each other, using themethod bundle adjustment.

The bundle adjustment was perormedin a local coordinate system, defnedby the orientation sotware. Ater thebundle adjustment the orientation othe scans was locked and all scansare urther on handle as one scan (acluster). In step two, the cluster wastransormed into the platorms modulesystem. But as no survey with totalstation was possible, seven targetssurveyed on previous jobs were used.

Based on the orientated scans modeledtie-in points, a point cloud or clashcheck and a LFM Netview solution

could then be delivered (see Fig. 3,Right).

Fig. 3 LFM NetView project

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Fig. 2 IMAGER 5006EX used bya member o the Ramboll team

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Deliverables

The fnal deliverablewas to supply detailedaccurate point cloud datain true coordinates o the rig(see Fig. 4 & 5).

From start to fnish, Ramboll utilisednew technologies in both, hardwareand sotware to enable data to be fnallyused within a design environment.

Fig. 4

Fig. 5

For the frst time Maersk wereable to gain invaluable datarom the platorm, to enablemuch needed design work on

the existing plant, modellingpipes and valves or uture tie-ins or upgrades to the platormand modifcations in the uture.

g. 4

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Zoller + Frhlich GmbHSimoniusstrasse 22, 88239 Wangen im Allgu, Germany

Phone: +49 7522 9308-0, Fax: +49 7522 9308-252, info@zf-laser.com, www.zf-laser.com

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