Heavy Liquid Hydrocarbons: Their Production and the Resulting CO2 Footprint
Tony Kovscek Stanford University Energy Resources Engineering email:[email protected]
First, a little quiz … Where does imported oil originate?
Jan - Jul 2007
4%
0%
1%
1%
Domestic Production
1%
1%
1%
1%
4%
3%
3%
36%
6%
7%
9%
9%
12%
Energy Information Administration, www.eia.doe.gov
Where does imported oil originate?
4%
0%
1%
1%
1%
1%
1%
1%
4%
Domestic Canada
3%
3%
6%
36%
Mexico Saudi Arabia Venezuela Nigeria Algeria Iraq Angola Colombia Kuwait
Saudi Arabia
7%
Libya
Mexico
United Kingdom Ecuador Brazil
Canada
9%
9%
Equatorial Guinea Other
12%
Energy Information Administration, www.eia.doe.gov
Who has large proved oil reserves?
Oil and Gas J., 2003
300 250 200 150 100
50
0
Reserve≠Resource
Reserve is energy that you can recover economically with existing technology.
Who has large proved oil reserves?
Oil and Gas J., 2003
300 250 200 150 100
50
0
Today’s Presentation
• What has Canada got?
– What is heavy oil? – What is heavy oil? – Why do you care about heavy oil?
• Heavy-oil recovery methods are energy intensive
– Alberta Canada Oil Sands – Kern River, CA
• CO2 foot print for heavy oil production
– energy needed to produce heavy oil – implications for CO2 production
• Summary
USA-Alaska 80 Bbbl
Middle East 1400 Bbbl conventional oil
Canada 2732 Bbbl
USA-Continental 137 Bbbl
Venezuela 700-3000 Bbbl
Say that world consumption is 25 Bbbl/yr, R/P = 240 years
What is heavy oil?
• heavy oil: about as dense as water (1000 - 930 kg/m3) tar or bitumen: more dense than water (> 1000 kg/m3)
• rules of thumb
-water 1 cP -100,000 cP for 10°API at 30°C -100 cP for 20 °API at 30 °C
• well productivity
1
J ~
µoil
Why do you care about heavy oil ?
World oil production, Hubbert-Style peak oil
World oil consumption
30 25 20 15 10
5
conservative prediction best prediction
actual data
QuickTime™ and a
TIFF (LZW) decompressor are needed to see this picture.
2001
2020
0
- 1800
- 1850
- 1900
- 1950
- 2050
- 2100
- 2150
yea2r000
Shell Global Scenarios to 2025, www.shell.com
Why do you care about heavy oil?
Sustained Growth Scenario (Shell)
World Population
Heavy Oil Fills the Gap
How do we recover heavy oil?
• Primary (heavy-oil solution gas drive) • Secondary (water injection) • Tertiary
more desirable?
-steam injection -in-situ combustion -vapor extraction -electrical heating
• Strip mining
Aurora Mine
Oil Sands Development
QuickTime™ and a
TIFF (Uncompressed) decompressor are needed to see this picture.
open-pit mine
Syncrude: •Base mine–3.1 miles by 4.3 miles by 197 ft. deep •North mine–9 miles by 1.2 miles by 262 ft. deep •Aurora mine–3 miles by 1 mile by 229 ft. deep
open-pit mine 2 tonnes oil sand (basis)
240-400 tonne capacity
open-pit mine 2 tonnes oil sand (basis) truck to a roll crusher
open-pit mine
2 tonnes oil sand (basis) truck to a roll crusher
reject some solids, slurry and pipeline open-pit mine
2 tonnes oil sand (basis) truck to a roll crusher reject some solids, slurry and pipeline
extraction
Extraction: • hot water • NaOH
sand water
• vigorous mixing • get about 75% of OBIP
bitumen
open-pit mine
2 tonnes oil sand (basis) truck to a roll crusher reject some solids, slurry and pipeline
extraction separation
bitumen
sand open-pit mine
2 tonnes oil sand (basis) truck to a roll crusher reject some solids, slurry and pipeline
extraction separation pipeline to upgrader
Upgrading and hydrotreating: • cracking (add H2 using CH4) • coking (carbon rejection) • S and N2 removal
open-pit mine
2 tonnes oil sand (basis) truck to a roll crusher reject some solids, slurry and pipeline
extraction
• Light sweet crude
separation
•>1 MMbbl/day output total Canada
(Syncrude, Suncor, PetroCanada) • 39% of Canadian oil production (2005)
• 1/8 gasoline in Canada, Syncrude • Syncrude cumulative > 1 Bbbl
pipeline to upgrader 1 barrel of syncrude (1 bbl = 42 gal=0.16m3)
Operating Costs and Oil Production
Syncrude only
QuickTime™ and a
TIFF (LZW) decompressor are needed to see this picture.
Canada Oil Sands Trust, http://cos-ar.beta.zu.com/annual_report/2006/
0.4 tonne CO2/bbl 940 lbs CO2/bbl
Oil and CO2 Production
crude oil
2 tonnes sand = 1 barrel
220 lbs CO2 / bbl 4.4 BTU of oil / BTU CH4
Where will the natural gas come from?
Image source unknown
CO2 Implications
• By 2015, annual CO2 emissions from upgrading operations are estimated to be 94 Mt
• By 2050, perhaps 2000 Mt per year • Canada’s Kyoto emissions goal is about 500 Mt per year
• Alternative to natural gas for processing is nuclear power (hydrogen and steam), Alberta Energy Corporation 5 Mar 07 press release, CANDU reactor for N. Alberta
Kern River (Kern Co., CA)
Lost Hills
- 99
- I-5
N. B.
South Belridge
Bakersfield 58
Kern River
Cymric
Elk Hills
Buena Vista MWSS
Stanford
miles
- 0
- 16
Bakersfield
Kern River
• Discovered 1899 by a farmer digging a water well.
Hit oil at 40 ft (or 70 ft) below ground (bgs)
• Original oil = 3.8 Bbbl • Producing interval: 500-1300 ft • Geology:
– Alternating sand and shale sequences – at least 7 major units – Dispersed silt in the sand zones
• Thickness: 30-90 ft net • Dip: 4 ° to the southwest
Why heat a heavy oil reservoir?
1
Oil viscosity versus temperature
productivity ~
µ
oil
10000
1000
100
10
Viscosity(cP)
1
- 0
- 100
- 200
- 300
- 400
temperature (°F)
Steam Injection
acknowledgement: U.S. DOE, SCNGO, http://www.netl.doe.gov/scngo/index.html