zupt inertial metrology - sut / ths subsea metrology seminar

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Metrology

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Page 1: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

Metrology

Page 2: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

ContentsMetrology surveys – we need to be:

Very efficientWhile delivering the required accuracyWith known quality.

Topics today:Dimensional Control and offsetsMechanical interfaces between instruments and structuresROV operational issuesBathymetry surveysQuality control displays while collecting dataOffshore deliverables

Page 3: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

Proven technologyZupt has been in business since 2005, operating offshore since 2007 – firstcommercial client for metrology early 2008. To date we have commerciallydelivered >80 inertial metrologies in:

Regions:West Africa rigs and survey vesselsU.S. Gulf of Mexico rigs and survey vesselsNorth Sea from rigBahamas (42” dia. spool) shallow water barge with divers

Fields worked:Angola: Shenzi, Pazflor, Girassol, CLOV, Dahlia, GirriCongo: Moho BilondoGoM: Mississippi Canyon, Green CanyonNorth Sea: Pelican

Clients:Total, BHP Billiton, Shell, LLOG, C&C Technologies, TAQA, Acergy,Statoil, Jan de Nul. Near term future work in Malaysia & Russia?

Page 4: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

Inertial MetrologyMature and fully proven – if you have a place to stab inertial will work

Accurate: +/- 25mm to 20m jumper/spool length +/- 50mm to 50m jumper/spool length+/- 75mm to 90m+/- 100mm for longer lengths <150m

Practical – clients can QC our data within hours of first exposure

Very efficient (much less boat/rig time needed) ~ 6 hours for full metrology including route survey

Works in the presence of drilling noise and vibrationNo “line of sight needed”Smaller footprint - less people on board (POB) – less bunk space neededVessel independent – MSV, divers or a rig – no need for USBLConnector independent – Horizontal, Vertical, SHO, PLET, FLET etc.One channel needed from ROV – hence very fast ROV mob timeInertial needs no vessel time to deploy array frames or complex subsea stands

Page 5: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

One more time - what is needed?Deliverables from a metrology:When we look at accuracy, efficiency and quality we have tounderstand the subtle issues associated with all of the deliverablecomponents required of a metrology survey:

Hub to Hub Horizontal RangeHub Attitude (Heading, Pitch, Roll)Alpha / Beta Angles between Hubs (for horizontal connectors)

Hub Step HeightsDepth Difference between HubsBathymetric Profile of Jumper Route

We spend more time acquiring the bathy than we do the distance orattitude data. We spend more time processing the bathy as well.

Page 6: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

DC - Offsets and accuracySounds obvious – BUT!

Install receptacles or survey points close to hubMake sure it is accessibleMake sure both linear and angular lever arms aremeasured.Is it better to have a fixed receptacle further away, or toolingthat is installed onto the hub face? Both!

Page 7: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

ToolingWe believe that the mechanical interface to the structure is one of themost critical issues that impacts the accuracy, efficiency andquality of metrology surveys.

OR

Page 8: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

ToolingDoes it matter that the stab has an interference fit with thereceptacle – or if we can stab the tool in faster.

Slightly longer stabs make up easierProtect the nose of the stab and it will always fit

OR OR

Page 9: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

ToolingComplete a make up test of tooling if at all possible

Good Bad

Page 10: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

ToolingDo not make the tooling overly heavy – if it is going to be used in a “plastic receptacle” – it will break the receptacle!

Page 11: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

Tooling Examples

Aligning an inertial system in a Compatt frame - Bucket Stab

Page 12: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

Tooling ExamplesCLOV Tool Trouser Plate

“Wine glass” and “SRIP” plate

Page 13: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

Tooling Examples

Vertical connector – pressure capNo heading required

Brownfield measurements on existing installations

Page 14: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

ROV operational issuesPower: 24V dc, 75W (battery back up internal to our tool)

Communications: A single RS232 115,200 (can live with 38,400)baud rate com port.

We supply a serial mux [MicroTTU] into C-PINS for all externalsensors. ROV’s rarely have the channels available that were availablewhen talking about the job on the beach.

Page 15: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

ROV operational issuesCabling – ground faults and make up time!!

OR

Page 16: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

ROV operational issuesLifting and handling - T, Fishtail – manipulator compliant

Page 17: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

Bathy Survey - step or fly?Step Bathymetric Survey (Digiquartz)Log position every 2 m along jumperroute with Digiquartz.

Fly Using mini SVS and an Altimeter in addition to the Digiquartz we fly the route

Page 18: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

Fly the route or Step the route?Why don’t we always fly the route survey?

Page 19: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

Step Height SurveyStep Height SurveyTop of hub to plant North mudline depth measurements

Step Height Survey provides hub heights and mudline data.

Page 20: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

Step height measurementsStep heights at manifolds areeasy.At the well – a whole otherstory. Frame grabs should beincluded in reports to explainwhy.

Page 21: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

Zupt uses our proprietary software for data acquisition and on-line QC -SSTT (Sub Sea Time Tag)Our real time QC lets us know when we have a valid data set with thequality specified as we are working.

Accuracies we have within current contracts:Hub to Hub Horizontal Range +/- 50mm-+/- 75mmHub Attitude (Heading, Pitch, Roll) +/- °0.5Alpha / Beta Angles between Hubs +/- °0.5Hub Step Heights +/- 75mmDepth Difference between Hubs +/- 50mmBathymetric Profile of Jumper Route Not specified

Quality required

Page 22: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

Real-time quality controlIt is critical that we see realtime quality data as we areworking.

Position loop selection onthe left.

Individual data sets and theirimpact on the final solutionare on the screen in front of us– as we collect the data.

We know when we are done!SD at ~65% of client spec.

Page 23: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

Alpha and Beta angle quality

Page 24: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

DeliverablesODEL (Offshore Deliverable)

Prior to departure from the survey platform (vessel or rig) the metrologyresults are delivered to the client in the form of an offshore deliverable.

ODEL contains all metrology data required for jumper fabrication.

All of our data is sent emailed to Houston for QC during and immediatelyupon completion of survey(24/7/365). Client is issued raw data within anhour of survey completion.

Results delivered within min 12 hours, max 24 hours of data acquisition.

Page 25: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

Offshore Deliverable

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Offshore Deliverable

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Offshore Deliverable

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Offshore Deliverable

Page 29: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

Offshore Deliverable

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Offshore Deliverable

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Metrology from imaging?The next generation – “Fly by metrology”

Precise measurements made within photogrammetry like datacollected by frame grabbing video imagery – fly the route a fewtimes – process solution.

Page 32: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

High resolution, geospatially correct

Page 33: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

See separate image

Image based metrology

Page 34: Zupt Inertial Metrology - SUT / THS Subsea Metrology Seminar

Thank You

Zupt, LLC10963 Cutten Rd, A102Houston, TX 77066+1 832 295 7280

Keith Vickery [email protected] Cell +1 (832) 465 4020President

www.zupt.com