SECARB - Plant Barry to Citronelle - Knowledge Sharing Conference - Mobile - May 17, 2012
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SECARB – Plant Barry to Citronelle
Knowledge Sharing Conference - Mobile - May 17, 2012
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NYSE: DNR
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Our Company x
Denbury Resources Inc. (NYSE: DNR):
!! A growing independent oil and gas company
!! Approximately 1309 employees (578 in Plano,731 in the field)
!! The largest oil and natural gas operator in Mississippi and Montana
!! Owns the largest reserves of CO2 used for tertiary oil recovery east of the
Mississippi River
!! Holds significant operating acreage in the Rockies, Mid-Continent and Gulf
Coast
2
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Areas of Operations: 2 Target Areas x
Rockies
MT ND
Greencore
ID Pipeline SD
Lost
Cabin
Rockies Pipelines
Source: Riley Ridge
Greencore Line WY
•!Bell Creek (C) (EOY) IL
•!Cedar Creek Anticline (TBC) IN
Anadarko Line
•!Grieve (TBC)
Gulf Coast Pipelines
Source: Jackson Dome
KY
NEJD Line
•!Brookhaven
•!Mallalieu
•!Little Creek
•!McComb
•!Smithdale
•!Cranfield
MS •!Lockhart Crossing
Delta Pipeline Free State Line
Gulf Coast Sonat MS
Jackson
Dome
Free State
•!Martinville
•!Soso
Existing CO2 Pipelines Pipeline Pipeline •!Eucutta
CO2 Pipelines Under Development LA NEJD •!Heidelberg
TX Pipeline Delta Line
Green
Rocky Mountain Fields With EOR Potential Pipeline •!Tinsley
•!Delhi
Existing Anthropogenic CO2 Sources Green Line
•!Oyster Bayou
Proposed Coal to Gas or Liquids •!Hastings
•!Seabreeze
CO2 Source Owned or Contracted •!Conroe (TBC)
•!Thompson (TBC)
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Denbury Study Partnerships x
!! East Region
!! Cranfield – Adams & Franklin Counties, MS
!! Large Scale CO2 Injection MVA – BEG / SECARB
!! Citronelle – Mobile County, AL
!! CO2 Injection Pilot – UAB / UA / AA&M / UNCC
!! Sequestering CO2 in a Saline Reservoir – EPRI / SSEB / SECARB
!! West Region
!! West Hastings – Brazoria County, TX
!! Anthropogenic CO2 Injection for EOR MVA – BEG / GCCC
!! Delhi – Richland Parish, LA
!! Geophysical Mapping – CSM
!! North Region
!! Bell Creek – Powder River County, MT
!! MVA Program – PCOR / EERC / UND
!! MVA (Monitoring, Verification, Accounting)
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Citronelle Field – Basic Facts x
!! Citronelle Field located in & around
the City of Citronelle
!! Approx. 1 hour north of Mobile, AL
!! Field is comprised of 3 active units:
Main, East & Southeast
!! There are 423 wells in the 3
Denbury operated units
!! 168 active producers
!! 62 active injectors
!! 7 SWD wells
!! 93 TA/TP wells
!! 88 plugged
!! 5 SECARB
!! Denbury took over operations on
Feb. 1, 2006 from Merit Energy
5
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SECARB Phase III Anthropogenic Test - Schedule x
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.
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
years beginning in 2Q 2012.
3 years of post-injection monitoring.
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CO2 Pipeline Right-of-Way x
•! Approx. 12 mi (19 km) to the SE Citronelle Unit
in Citronelle Oil Field
•! Right-of-Way
•! 1" mi (2 km) inside Plant Barry property
•! > 8 mi (13 km) along existing power corridor
•! 2 mi (3 km) undisturbed forested land
•! Permanent cleared width 20 ft (6 m)
•! Temporary construction width 40 ft (12 m)
•! Right-of-Way habitat
•! 9 mi (14.5 km) of forested and commerical
timber land
•! 3 mi (5 km) of emergent, shrub and forested
wetlands
•! Endangered Gopher Tortoise habitat
•! 110 burrows in or adjacent to construction
area
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CO2 Pipeline and Measurement Design x
•! Applicable regulatory standard: US
Depart of Transportation, 49 CFR Part
195 —Transportation of Hazardous
Liquids by Pipeline
•! Welding - API 1104 & B31.3 (plant
section)
•! 4-inch (10 cm) pipe diameter
•! X42/52 carbon steel pipe
•! MOP – 2,220 psig (flange limitation)
•! Normal operating pressure: 1,500 psig
(10.3 MPa) maximum
•! Buried average of 5 ft (1.5 m) with
surface re-vegetation and erosion control
Handling pipe for horizontal directional drill
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CO2 Pipeline Design and Construction x
•! Directional drilled 18 sections of the pipeline
under roads, utilities, railroad tracks, tortoise
colonies, and wetlands. (30 to 60 ft deep)
•! Trenched remaining sections
•! Corrosion protection
•! Fusion Bond Epoxy coated pipe
•! “Jeep” pipe for coating damage; manually
coat joint welds and scratches
•! Impressed current cathodic protection
Workers dressing welded pipe joints
•! AC mitigation for overhead powerlines
using copper wire
•! ACVG survey after construction to check
again for coating damage
•! Caliper tool run to check for dents caused
by rock or equipment
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CO2 Pipeline and Measurement Design x
•! Denbury pipeline purity requirement
is:
•! > 97% dry CO2 at 115ºF (46ºC)
•! < 0.5% inerts (incl. N2 & argon)
•! < 30 lb water per 1MMSCF
•! < 20 ppm H2S
•! Impurities affect and sometimes
amplify pipe fracture toughness
requirements
•! Hydrogen & N2 problematic
•! Toughness requirements for this
project met by standard X42 pipe.
Other projects require added wall
thickness, modified pipe chemistry
and/or crack arrestor installation.
Custody meter station and building
10x
CO2 Pipeline and Measurement Commissioning x
•! Pipeline was commissioned March 8, 2012
•! At custody meter station there is the capability of
taking samples of CO2 stream.
•! Samples will be taken periodically for permits
and GHG reporting.
•! Sample obtained for Class V injection permit
showed 99.6% pure CO2.
•! Major impurities were
•! Nitrogen (2700 ppm)
•! Line was filled with N2 to pressure test line
then swept with CO2 prior to commissioning
•! Oxygen + Argon (880 ppm).
•! Lab impurity?
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CO2 Pipeline and Measurement Design x
•! CO2 Specific Design Requirements
•! Valve seals – Accepted: Nylon,
peroxide cured Buna N
(HBNR-90/95), ethylene
propylene rubber (EPDM)
•! Valve packing – Teflon
•! Low temperature materials for
valves used for blowdown
service only.
•! Mainline valve station similar to
natural gas with blowdowns for
maintenance.
Mainline valve station & CP test station
12x
CO2 Pipeline and Measurement Design x
•! CO2 measured with senior orifice
meter and gas chromatograph
•! Custody measurement meets AGA
Report #3, Parts 1 & 2
•! Accuracy and mechanical issues with
turbine, Coriolis, & ultrasonic meters
•! Turbine – CO2 is dry – damages
moving parts. CO2 viscocity range
can be problematic
•! Coriolis – Accuracy not as good as
orifice
•! Ultrasonic – CO2 absorbs and distorts
signal Check meter station and building at
•! Communication using SCADA and Denbury Citronelle Field
satellite.
•! Check meter installed for pipeline leak
detection and verification of injected
volumes
13x
CO2 Pipeline and Measurement Design x
•! CO2 Booster Pump
•! Designed & fabricated by Wood Group
(GE)
•! 130 stages (impellers)
•! 44 # ft long
•! 4” suction – 3” discharge
•! 300 HP electric motor – 3570 rpm w/
variable speed drive
•! Pneumatic shut downs (2), pneumatic
control valves (2), manual shut down
valves (2), vibration shut down switch
(1), manual blowdown valves (2),
discharge check valve (1)
•! Inlet pressure 1300 psi – outlet
pressure 3200 psi
•! Variable speed drive with recycle valve
for near 100% turndown
•! Max rate approx. 14 MMCFD CO2
Horizontal Injection Pump @ D-9-7 #2 Wellsite
•! Satellite link for communication
•! 2 pressure transmitters & 2
temperature transmitters
•! Stand alone air compressor system to
operate valves & controls
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