Castor Project – WP3.1 Casablanca field · PDF file©CASTOR-ENCAP-CACHET-DYNAMIS...

CASTOR-ENCAP-CACHET-DYNAMIS Common Technical Training Workshop – Lyon - 22/1/08©IF

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Castor Project – WP3.1

Casablanca field case

CASTOR-ENCAP-CACHET-DYNAMIS Common Technical Training Workshop – Lyon - 22/1/082

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Contents

• Presentation of the Casablanca field case

• Aim of the study

• Main tasks within this study (WP 3.1)

• Review of main results

• Conclusions


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Why studying CO2 storage in Casablanca?

Tarragona Refinery

Pipeline

Casablanca Field

Platform

0 25 km

CASABLANCA UNIT CONCESSION

Refinery in Tarragona (East coast of Spain) producing ~ 2.5 Mt CO2 / yearexpected capture ~ 0.5 Mt CO2 / year


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Cross section Refinery – Casablanca Platform

2,5 Mt CO2 / year

TARRAGONARefinery

45 km

Pipeline to Shore

Oil Field CHIPIRÓN

CASABLANCA Field Oil

Producers Wells

3.300 m

Control Line

Production Well CHIPIRÓN

116 mSubseaWellhead CHIPIRÓN

2.500 m

Production Line

CASABLANCA Platform

TARRAGONARefinery

CASABLANCA Oil Field

160 m

2.500 m

CASABLANCA Platform

Pretreatment

CO2 Recovery

Compression& Dehydration

0,5 Mt CO2 / year

CO2 line


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Casablanca reservoirDiscovered in 1975 (Repsol-YPF operator)Carbonate oil-field (complex geology)� Size : 11 km by 1.5 km� Depth at top : 2465 m TVDSS� Maximum oil column : 295 m

Undersatured reservoir� Oil gravity 33 °API � Rs 75 m3/m3

� Pini 256 bars (3,760 psi)

Very active bottom aquifer

30 years of production� 10 vertical or deviated wells� OOIP 356 x 106 bbls� NP 143 x 106 bbls� RF 40 %

Casa-1 (1975)

Casa-2 (1976)

Casa-1A (1977)

Mont-1 (1977)

Casa-12 (1984)

Casa-11 (1984)

Casa-15 & 15A (1985)

N

1 km

Platform (1982)

Casa-6 (1979)

Casa-7 (1982)Casa-9 (1982)

Casa-8D (1982)

Casa-10 & 10A (1985)

Casa-16 (1985)

Casa-17 (1991)

Casa-7UP (2000)


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Schematic vertical cross section of the reservoir

Jurassic & Cretaceous reservoir

CasablancaSan Carlos

caprock

Salouregional

seal

Jurassic & Cretaceous reservoir


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Aim of the study

Give answers to following questions:� Is the Casablanca reservoir suitable to store the amount

of CO2 to be injected during at least 30 years?� What would be the pressure variation inside the reservoir

during CO2 injection and afterwards?� What is the long term behaviour of the CO2 and the risk

of migration through: � wells, � cap rock,� faults,� bottom aquifer


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Main tasks within work package 3.1

3.1.1 Reservoir & caprock geoscientific characterisation• 3.1.0 Data gathering and review• 3.1.1 Building a geological model (reservoir & caprock)3.1.2 Fluid flow properties of reservoir and seal 3.1.3 Reservoir modelling (CO2 injection scenarios)3.1.4 Geochemical and geomechanical experiments

& modelling3.1.5 Well integrity analysis (injection wells and

neighbouring wells)3.1.6 Long-term modelling of CO2 sequestration3.1.7 Monitoring of CO2 injection3.1.8 Integrated risk assessment analysis

IFP - RIPSA

ENI - SINTEF

IFP -RIPSA - STATOILBGS - BRGM

IFP – RIPSA

OGS

IFP

IFP


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Capacity to store the CO2 ?• Not possible to build a geological model (lack of data)

• Iterative construction of a BO reservoir model essentially matched using the long production history of the wells

• Lab experiments done to get compositional PVT data with the Casablanca oil and CO2

• Simulation of three CO2 injection scenarios (injection from 2 existing wells or from a new horizontal one)

Result:

The reservoir has the capacity to store the planned amount of CO2


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View of the Casablanca reservoir model


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Example of CO2 injection scenario (new well)

Oil saturation (1975 - initial state)

Vertical scale exaggerated


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Oil saturation (2007 – start CO2 injection)


Inj well


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Oil saturation (after 15 years of CO2 injection)


Inj well


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Oil saturation (after 30 years of CO2 injection)


Inj well


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Pressure variation in the reservoir due to CO2 injection ?

CASA-16

168

218

268

318

0 1825 3650 5475 7300 9125 10950 12775 14600 16425 18250 20075Time (day)

BH

FP (

bar)

Production phase

Injection phase

CASA-11

168

218

268

318

0 1825 3650 5475 7300 9125 10950 12775 14600 16425 18250 20075Time (day)

BH

FP (b

ar)

Production phase

Injection phase

CASAinj1

168

218

268

318

0 1825 3650 5475 7300 9125 10950 12775 14600 16425 18250 20075Time (day)

BH

FP (b

ar)

Production phase

Injection phase

Possible increase of reservoir pressure in the vicinity of injection well (max. 30 bars)


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Long term behaviour of the CO2 and risk of migration along faults?

• Numerical modelling of CO2 migration along a fault and Messinianunconformity to the Castellon sandstones

• Monitoring plan to follow the CO2 migration


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Modelling of CO2 migration along a fault

Castellonsands

Top reservoir

Castellonshales

Faults


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Long term behaviour of the CO2 and risk of migration along faults?

Result: The CO2 does not reach the major fault after 1000 years of migration whatever the scenarios

Sg at start of leak

Sg after 1000 years

20 km


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Long term behaviour of the CO2and risk of lmigration through the caprock?

• Geochemical lab experiments assessed the properties of the seal and fluid-rock interactions (130°C – 260 bars)

The most important fluid-rock reaction identified was dissolution ofcarbonate minerals, calcite being main & fastest carbonate dissolving

• Geochemical modelling using this data evaluated the risk of CO2 migration through the cap rock

Reactions of injected CO2 with reservoir rock are expected to have some local impact in the near injection wellbore (reduction of injectivity)

In the case the capillary entry pressure is exceeded (~15 bars), the CO2 is supposed to travel through the San Carlos local cap rock and enter the Castellon sandstone (similar to migration along a fault).


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Long term behaviour of the CO2 and risk of migration in the wells?

• Well completions have been reviewedSpecial attention has to be paid to wells which are abandoned and/or for which mud losses occurred during the drilling

• Lab experiments have been performed to assess alteration of the cement used to complete the wells due to CO2

• Initial permeability was about 2.5 nD• After aging with CO2 at 45°C the mean HP final permeability

resulted 715 nD• Degradation and microfractures have been observed• Measured Capillary Breakthrough Pressure to HP CO2 is very

low, can be assumed zero considering experimental errors


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Conclusions• Casablanca reservoir is really complex• Planned tasks to answer main questions relative to ability to

store CO2 in Casablanca have been successfully performed• Necessary assumptions have been made and additional work

is required where uncertainties remain:• Well injectivity (CO2 – rock interaction)• Well integrity (workovers for recompletion)• Strategy for CO2 injection to avoid excessive pressure increase

• From what has been done, the assessment about the technical suitability of Casablanca as a CO2 safe storage cannot be already made

• Thanks to all partners for their strong involvement and excellent collaboration

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Castor Project – WP3.1 Casablanca field · PDF file©CASTOR-ENCAP-CACHET-DYNAMIS...

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