Fracture Technologies

The Effect of CondensateBanking on Production

The Effect of CondensateBanking on Production

FracTech Work ShopFracTech Work Shop

June 2003June 2003

Fracture TechnologiesCondensate Banking

(From a fracturing point of view)

Condensate Banking (From a fracturing point of

view)• For some time the fracturing industry has realized that For some time the fracturing industry has realized that

condensate has an adverse effects on well productivitycondensate has an adverse effects on well productivity

• In some cases, fracturing was applied to overcome In some cases, fracturing was applied to overcome condensate banking around the well, with some condensate banking around the well, with some successsuccess

• However, either with un-fractured wells, or with However, either with un-fractured wells, or with fractured wells condensate banking is seldom fractured wells condensate banking is seldom modelled or considered in frac designmodelled or considered in frac design

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WellWhiz ModelsWellWhiz Models

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Rel PermRel Perm

Fracture Technologies

Condensate effects on 1.50 mD reservoir Condensate effects on 1.50 mD reservoir

Gas rates

Condensate rates

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Frac Lf=200 ft-16/20 3 Lb/ft2Frac Lf=200 ft-16/20 3 Lb/ft2

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Condensate BankingCondensate BankingTime =0

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Condensate Saturation after 212 daysCondensate Saturation after 212 days

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ZoomedZoomed

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Condensate in the fracCondensate in the frac

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Gas Rate (unfractured), K=10 mDGas Rate (unfractured), K=10 mD

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K=10 mD, 16/20 3 Lb/ft2K=10 mD, 16/20 3 Lb/ft2

Cumulative

Rate

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K=10 mD, 20/40 1 Lb/ft2K=10 mD, 20/40 1 Lb/ft2

Cumulative

Rate

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Cumulative Production (BCF)Cumulative Production (BCF)Frac Quality Gas Prod.

(Condensate banking)

POOR FRAC (1 Lb/ft2 20/40)

6.80

GOOD FRAC (3 Lb/ft2 16/20)

8.80

Fracture Technologies

ConclusionsConclusions

• Condensate banking can now be modelledCondensate banking can now be modelled

• Condensate banking necessitates fracture Condensate banking necessitates fracture design with TSO and large proppantsdesign with TSO and large proppants

• Condensate banking will have an effect on Condensate banking will have an effect on proppant flow back due to multi-phase effectsproppant flow back due to multi-phase effects