11_husebo - tracerco separator

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Separator Control inChallenging Conditions

Measuring Sand to Foam inTar Sands to Desalter Applications

ByMagne K. HusebøTracerco Norge AS

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Ins igh t Ons i te 

• Process Diagnostics• Measurement Systems• Flow Assurance

 Aberdeen Baku Bankok Bergen Billingham Haag HoustonKuala Lumpur Oldenburg Oman Milano Perth Port of Spain Rio

Sarnia Shanghai

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Tracerco Profiler ™

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North America - 48

Russia - 6

SE Asia - 11

Scandinavia - 68UK - 26

China - 26

FSU - 6

South America - 12West Africa – 32

MENA – 23Australia – 11

Tracerco Profiler ™ – approaching 270 units

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Heavy oil applications:

• Offshore separators• Tar sand applications• Refinery: heavy oil desalter applications

Tracerco Profiler ™

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Tracerco Profiler ™, heavy oil references:

Field / Asset: Applicaton: Installation

StatoilHydro Grane, Norway (API 18,7) Separator Control 2003

SunCrude, OilSands, Canada Separator Control 2005

Shell Canada, Oil Sands, Canada Separator Control 2006

Suncor Energy, Oil sands, Canada Separator Control 2007

BP Cherry Point, USA Desalter (Refinery) 2007(BP Helios Award)

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Tracerco Profiler ™, heavy oil references:

Field / Asset: Applicaton: Installation:

StatoilHydro Grane, Norway (API 18,7) Separator Control 2003

SunCrude, OilSands, Canada Separator Control 2005Shell Canada, Oil Sands, Canada Separator Control 2006

Suncor Energy, Oil sands, Canada Separator Control 2007

BP Cherry Point, USA Desalter (Refinery) 2007(BP Helios Award)

New Project:

Heavy Oil FPSO (13,8 API) Separator Control PO just released

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• No significant interface between water and oil

• High viscosity: High separation temperature

• High viscosity: Oil buid-up at measurement probes

•Solids in oil

Measurement in heavy oil separators – challenges:

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Level Measuremet in Heavy Oil

Tar Sand Applications

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Oil SandsOil/Water/soilds separation

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Oil SandsOil/Water/soilds separationPrinciples of Operation

Oil / Water / Solids

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Oil SandsInstallation of Tracerco Profiler Installed (2005)

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Oil SandsTracerco Profiler 

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Level Measuremet in Heavy Oil

Offshore Gravity separators.

StatoilHydroGrane Platform

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StatoilHydro Grane Separator Level Instruments:

2001 Design

- Separator level instruments:Capacitance, Ultrasonic, Level Sight Glasses,Traditional Gamma Measurement & Gamma Profilers

2003 Operation

- 90% production through-put

2005 Control / Measurement Task Force start-up

- Evaluation of all measurement principles installed

2007 Task force program completed:

- Successful use of enhanced Tracerco Profilermeasurement algorithm

Source: Nivåmåling med Profilstav, R. Åsheim, SH, Offshore Instrumentering 2008, TeknaTeknisk Ukeblad, Grane over på Auto, June 2007

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Grane 1st stage Separator 

Profiler 

Oil/Water InterfaceLevel

Level GlassOil/Water InterfaceIndication

Control Algorithm

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Measurement of API10 Oil?

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Measurement of API10 Oil?

 Yes,

Tracerco Profiler: Am241 isotope

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Measurement of API10 Oil?

 Yes,

Tracerco Profiler: Am241 isotope

 Absorbtion factor water = Absorbtion factor oil

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Measurement of API10 Oil vs water?

 Yes,

Tracerco Profiler: Am241 isotope

 Absorbtion factor water = Absorbtion factor oil

The uncorrected density measurement valuedestinguishes between water and oil at similar density.

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Real Density scale

50 kg/m3

 Apperant Density Changefor 70 kg/m3

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Level Measuremet in Heavy Oil

Desalter applictions.

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Level Measuremet in Heavy Oil

Desalter applictions.

Challenge: High Temperature

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Tracerco Profiler  – Desalter Application

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3 mm water / glycol

Cooling jacket

Max temp. 200 deg C

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Solid build-up!

- How to secure separator level measurement!

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930

960

990

1020

1050

1080

1110

1140

1170

1200

1230

1260

1.00.90.75

Oil Emulsion   Water

Level/mm

Density

Defined density bands

Detectors

GammaDetector 

Rod

GammaSource

Rod

Sources

Normal operation

1290

Gas

0.4

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930

960

990

1020

1050

1080

1110

1140

1170

1200

1230

1260

1.00.90.75

Oil Water

Level/mm

Density

Defined density bands

GammaDetector 

Rod

GammaSource

Rod

Measurement offset by solid build-up

0.4

DetectorsSources

Gas   Emulsion

DensityOffset

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930

960

990

1020

1050

1080

1110

1140

1170

1200

1230

1260

1.00.90.75

Oil Water

Level/mm

Density

Defined density bands

GammaDetector 

Rod

GammaSource

Rod

 Adjustment by known density (gas)

0.4

DetectorsSources

Gas   Emulsion

DensityOffset i.eCorrection

Value

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930

960

990

1020

1050

1080

1110

1140

1170

1200

1230

1260

1.00.90.75

Oil Water

Level/mm

Density

Defined density bands

GammaDetector 

Rod

GammaSource

Rod

Correted for HC solid build-up

0.4

Gas   Emulsion

Correction

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Heavy Oil

Future SeparationMeasurement applications

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Tracerco Profiler 

Pipeline Clamp-on version

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Insigh t Onsi te 

Thank You for your attention!