BR - Subsea Oil Water Separation

7/27/2019 BR - Subsea Oil Water Separation

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PETROBRAS TOTAL WORKSHOP

Subsea Oil Water Separation - OWS

SSAO OWS FOR MARLIM FIELD

France, June 2008


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OutlineOutline

1. Petrobras Motivations2. Scenario for the Prototype

3. Challenges & Petrobras Actions

4. Prototype Design Premises


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Motivation: High watercutsMotivation: High watercuts

2007 2010

Water treatment

Year

Water

2015

Increasing production of water - Platforms topped-up

Increasing cost of water treatment

Increasing production of water - Platforms topped-up

Increasing cost of water treatment


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Motivation: EnvironmentMotivation: Environment

Environment friendly solution Environment friendly solution

Reservoir

Subsea separation

Surface separation andtreatment

Multiphase

production

Water

discard

Water

discard

Multiphase

production

.

. .

. . .


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Year of discovery: 1985

Year of start-up: 1991

Total oil production:

Peak: 650,000 bpd, apr-2002

Currently: 410,000 bpd, jan-2007

Total water production:

295,000 bpd, jan-2007

Water depth: 500 m to 1,000 m

Campos Basin

N

Scenario for the Prototype in MarlimScenario for the Prototype in Marlim


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Host PlatformHost Platform

P37

FPSO Turret

Process capacity

Oil: 180,000 bpd

Water: 120,000 bpd

Gas: 3.1 million m3/d

Water depth: 890 m


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Scenario Definition HistoryScenario Definition History

P35 Scenario

Basic Design 1

June 2006

1st evaluation

Redesign

API: 18 degree

Emulsion:

Higher stability

2nd evaluation

Dec 2006

P37 Scenario

API: 22 degreeEmulsion:

Low stability

Sand: up to 100 ppm

Basic Design 2

march 2008

3rd evaluation

Jun 2008

Prototype

2009/2010

Water depth: 870mWell: MRL-141Well: MRL-102


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PWRI - Marlim Field PilotPWRI - Marlim Field Pilot

LP Tests

Prototype 2009/2010

HP Tests

Detailed design

Manufacturing

Integration

Tests

Field

Tests

2009/2010June 2008


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Project StatusProject Status

Basic Design for P37 aplication ready

Tests at P35 / MRL 94 well interventions ongoing

Contract discussions on going

Waiting for FMC Commercial propposal

Technical and Economical evaluation ready waiting for FMC negociating

conditions for submitting to the Directive Comittee

Structuring for the implementation of the next phase


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ScenarioScenario

Marlim Field :

High water production and platforms topped up

No dump well

High absolute revenue/high impact for the technology

P37 Platform :

Oil API: 22 degrees (instead of API 18 degrees)

Lower emulsion stability (high stability for lower

APIs)

Available room on the Turret

Fewer changings to acomodate

Available power (2,5 MWatt)


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ScenarioScenario

Production well MRL 141:

70% watercut in december 2009

Total flow rate: 3500 m3/day

Reinjection Well MRL - 488

High reservoir permeability: 7000 mD

Possible injection above fracture propagation pressure


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Main Challenges for Marlim OWSMain Challenges for Marlim OWS

Emulsion stability

Reinjection

Separation

10 ppm of solids

100 ppm of oil

Up to 60% water in oil

Pipe separator compact gravity separation

Schmoo / Corrosion / Scale


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BR Actions to deal with the challengesBR Actions to deal with the challenges

Separation Tests in Porsgrunn, Conceptual Studies and in depth lab

researchs on heavy oil separation

Qualification Programbefore/during the SSAO (MarlimOWS) implementation

Emulsion Stability

Testing several chemicals for definition of the demulsifierto be injected on the gas lift line stream

Reinjection Tests on P35: reinjection of produced water

Schmoo/Corrosion/Scale Testing chemicals for dosed injection and/or batch

injection


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Reinjection tests at P35Reinjection tests at P35

Slop Tank

Degasser

TO

Gravityseparator

Reservoir

tank

Injection

Pump

Filters

Heatexchangers

Production

Wells

MRL-94

Overboarding

swivel

Choke

90C

40C

P35 tests


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SchmooSchmoo

Slop Tank

Degasser

TO

Gravity

separator

Reservoir

tank

InjectionPump

Filters

Heat

exchangers

Production

Wells

MRL-94

Overboarding

swivel

Choke

90C

40C

P35 tests

Schmoo detected

and sampled


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Design Premises for the Prototype on P37Design Premises for the Prototype on P37

Production wellReinjection well

Platform

Oil: 22o.API

Chemical injection

Total flow: 18,500 bpd

Watercut @ start-up: 65%

Production well MRL-141

Reinjection well MRL-93

Reinjection above fracturing

pressure

Expected minimum performance

water removal: 70%OWS

Oil in Water < 100ppm


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Produced Water and Re-injection WaterSpecificationsProduced Water and Re-injection WaterSpecifications

Well production stream

Maximum sand content: 100 ppm

Free water (demulsifier action)

Seawater water injection has washed up the reservoir

Specifications for the re-injection water system: Maximum sand content: 10 ppm

Maximum oil content: 100 ppm


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Oil/gas and low water

Oil-water line

Gas line

Multiphase flow

Simplified Process Flow DiagramSimplified Process Flow Diagram

Reinjectionwell

Oil/gas and lowwater to the

platform

Production inlet

From the production well

1 2

3

45

6

Gas-liquid

separation

Waterpolishment

Solids management system not depicted

Reinjection

Pump

Liquid levelchamber

gravity oil-water

separation

Real time oil inwater monitor

Platform


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Process Flow Diagram / Process Designand Related TopicsProcess Flow Diagram / Process Designand Related Topics


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Conceptual FMC for MarlimConceptual FMC for Marlim

HxLxW: 8,4m x 29,5m x 8,5 m

298 toneladas


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Marlim Oil Water Subsea SeparationConcept SSAOMarlim Oil Water Subsea SeparationConcept SSAO

Oil-water overall separation

efficiency expectative > 70%


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Subsea Separation StationSubsea Separation Station


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System Artistic ViewSystem Artistic View

Oil water

subsea

separator

Multiphase line w/

low watercut

ProductionWell

Reinjection

Well

Documents

BR - Subsea Oil Water Separation