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Flare practice & improvement on Gullfaks oil field. Magne BJØRKHAUG Ph.D. Adviser, Process safety, Statoil. Statoil operations in the North sea. 60 % of the produced oil and gas is operated by Statoil

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flare practice improvement on gullfaks oil field

Flare practice & improvementon Gullfaks oil field

Magne BJØRKHAUG

Ph.D.

Adviser, Process safety, Statoil

statoil operations in the north sea
Statoil operations in the North sea
  • 60 % of the produced oil and gas is operated by Statoil
  • Gas and oil is transported through extensive pipelinesystem or through offshoretanker loading of oil
  • Most new installations andsome of the old ones haveinstalled the flare gas recovery system
new flare practice on gullfaks oil field
New flare practice on Gullfaks oil field
  • One production mode - Two flare modes

Open and ignited flare

Closed flare system

basic elements in the new flare system
Basic elements in the new flare system
  • High integrity flare opening valve
  • Flare gas recovery system
  • Flare ignition system
  • High quality safety system
basic elements in the new flare system1
Basic elements in the new flare system

Bursting Disc

To the flare stack with

ignition

system

LO

LO

HH

HH

PT

PT

HIPPS

FOV

XV

Flare gas recovery system

Sources

HP K.O. Drum

flare practice improvement
Flare practice & improvement
  • Environmental and economical improvements
    • Reduces CO2 emission to the atmosphere
    • Save CO2 tax
    • Increase gas utilisation
    • Increase the lifetime of the flare tip
    • Reduces the need for purge gas in the flare system
flare practice improvement1
Flare practice & improvement
  • Operational improvement to achieve the results
    • A proper designed plant control system
    • A proper planned plant maintenance system
    • Recovery of gas from depressurisation of equipment
    • Recovery of blanket gas
flare practice improvement2

200 000

150 000

100 000

Volume: Sm3/d

50 000

0

1989

1990

1991

1992

1993

1994

1995

1996

1997

1998

1999

2000

2001

2002

2003

2004

2005

2006

Year

Flare practice & improvement
  • Avg. flare per year - Gullfaks C
flare practice improvement3
Flare practice & improvement
  • Gullfaks C - Daily flare volume 2005

900

800

700

600

3

500

1000 Sm

400

300

200

100

0

01.12.2005

01.05.2005

01.06.2005

01.07.2005

01.08.2005

01.09.2005

01.11.2005

01.01.2005

01.02.2005

01.03.2005

01.04.2005

01.10.2005

flare practice improvement4
Flare practice & improvement
  • Gullfaks C - Daily flare volume 2005

900

800

700

600

3

500

1000 Sm

400

300

200

100

0

01.12.2005

01.05.2005

01.06.2005

01.07.2005

01.08.2005

01.09.2005

01.11.2005

01.01.2005

01.02.2005

01.03.2005

01.04.2005

01.10.2005

A continues flare load of App. 50.000 m3/day is added at the bottom

estimates of reduced flaring
Estimates of reduced flaring
  • Total flaring 2005 for Gullfaks C: 26 656 m3/day
  • Continues basic load: App. 50 000 m3/day
  • Estimated total flare load: App. 75 000 m3/day
  • Estimated reduction for Gullfaks C in 2005: 60-70 %

Average reduction in yearly flaring du to the “no-flare” technology is approximately 50% on Gullfaks during normal operation

flare practice improvement5
Flare practice & improvement
  • Gullfaks flare system 12 years after:
  • The system have been operated without any
  • major problem for the operation time of 12 years.
  • The systems have been rebuilt to increase the capacity
  • due to tie-in of satellite fields.
  • Described in 1997 version of API 521.
  • Total savings in 12 years has been in the order of $ 200 mill.