CO2 Injection/Storage Site

Mobile

Alab

ama

Miss

issipp

i

Mobile County

Washington County

CO2 Pipeline

The CO2 capture unit at Alabama Power’s (Southern Co.) Plant Barry became operational in 3Q 2011.

A newly built 12 mile CO2 pipeline from Plant Barry to the Citronelle Dome completed in 4Q 2011.

A characterization well was drilled in 1Q 2011 to confirmed geology.

Two injection wells were drilled in 4Q 2011.

100 to 300 thousand metric tons of CO2 will be injected into a saline formation over 2 to 3 year period beginning in summer of 2012.

3 years of post-injection monitoring.

Plant Barry

Citronelle Dome

CO2 Injection Site

•! Proven four-way closure at Citronelle Dome

•! Injection site located within Citronelle oilfield where existing well logs are available

•! Deep injection interval (9,400 ft) •! Numerous confining units •! Base of USDWs ~1,400 feet •! Existing wells cemented through

primary confining unit •! No evidence of faulting or fracturing,

based on oilfield experience, new geologic mapping and reinterpretation of existing 2D seismic lines.

We collected new geologic data on the Paluxy reservoir and confining unit with the drilling of the project’s three new wells:

•! 210 feet of whole core and 70 percussion sidewall cores •! Full set of open hole logs on all three wells (quad combo, MRI, spectral gamma,

mineralogical evaluation, waveform sonic, cement quality, pulsed neutron capture) •! Baseline vertical seismic profiles and crosswell seismic collected in Feb 2012

•! Analysis of over 80 existing oilfield well logs for porosity, thickness and depositional style.

•! Sand mapping to determine “open” or “closed” sand units.

Baseline reservoir characterization:

CO2 Plume Extent 10 yrs after End of Injection

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•! Inject at maximum injection rate during for three years (500 tonnes per day).

•! Plume area in topmost sand is 0.35mi2 (225 acres)

•! Most of the CO2 enters the upper Paluxy sands due to higher permeability and injection gradient

•! These results are used to design injection (well design, completion program, monitoring program)

CO2 Saturation (v/v)

9460

9520

9540

9570

9710

9740

9800

9900

9970

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1. 16 ” Conductor Pipe set at 60 ’ . 2. 10 - 3/4 ” Surface Casing @ 2,520 ’ ,

set in 13 1/2 ” hole; 45.5 lb/ft J - 55 STC; Cemented to ground surface.

3. 7 ” Protection Casing @ 11,780 ’ , set in 9 - 7/8 ” hole; 26.0 lb/ft L - 80 LTC; Cemented to ground surface (2 stage).

4. 2 - 7/8 ” Injection Tubing @ 9,300 ’ ; 6.5 lb/ft - 8 threads and TK - 805 internal coating.

5. Annular Fluid: 8.4 lb/gal inhibited fresh water.

6. Injection Packer @ 9,358 ’ ; 7 ” x 2 7/8 ” AS1 - X Pryor nickel plated packer.

7. Tailpipe Below Packer, base at 9,391 ’ (33 ’ long)

8. Perforations (0.40 ” charges @ 2 shots per foot): 9,436 ’ to 9,800 ’ .

9. Cast Iron Bridge Plug at 10,800 ’ capped with cement.

10. Total Depth @ 11,780 ’ .

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4 3 2

1. 16 ” Conductor Pipe set at 60 ’ . 2. 10 - 3/4 ” Surface Casing @ 2,520 ’ ,

set in 13 1/2 ” hole; 45.5 lb/ft J - 55 STC; Cemented to ground surface.

3. 7 ” Protection Casing @ 11,780 ’ , set in 9 - 7/8 ” hole; 26.0 lb/ft L - 80 LTC; Cemented to ground surface (2 stage).

4. 2 - 7/8 ” Injection Tubing @ 9,300 ’ ; 6.5 lb/ft L-80 with NTS - 8 threads and TK - 805 internal coating.

5. Annular Fluid: 8.4 lb/gal inhibited fresh water.

6. Injection Packer @ 9,358 ’ ; 7 ” x 2 7/8 ” AS1 - X Pryor nickel plated packer.

7. Tailpipe Below Packer, base at 9,391 ’ (33 ’ long)

8. Perforations (0.40 ” charges @ 2 shots per foot): 9,436 ’ to 9,800 ’ .

9. Cast Iron Bridge Plug at 10,800 ’ capped with cement.

10. Total Depth @ 11,780 ’ .

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•! Near-surface and deep reservoir fluid sampling.

•! In-zone and above-zone pressure and temperature monitoring.

•! Cased-hole neutron logging. •! Crosswell seismic and VSP. •! Surface soil flux and tracer surveys

The Anthropogenic test will use five deep wells to track the CO2 plume plus three shallow water monitoring wells:

Results will be used to periodically update the reservoir model and UIC Area of Review.

•! Baseline monitoring began in late 2011

•! Permission to inject anticipated in May 2012

•! CO2 injection operations begin in June 2012, continue for 1 to 2 years

•! 3+ years of post-injection monitoring, then close site

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