Public BriefingEvacuation Order in Effect
585 days—1 year, 7 months, 8 days
March 11, 2014
A World of SolutionsTM 2
Sinkhole and south berm Cavern conditions Seismic events Gas Conditions and Venting
Agenda
A World of SolutionsTM 3
Sinkhole—February 2014
‐2’‐2’
‐10’‐10’
‐2’‐2’
‐10’‐10’Primary subsidence areaPrimary subsidence area
SinkholeSinkhole
Water
Between ‐2 and ‐10‐foot contour: Primary Sinkhole Subsidence Area
Deeper than ‐10 feet: Sinkhole
‐205’(‐260’ March
2014)
A World of SolutionsTM 4
0
10
20
30
40
50
60
Aug‐12
Oct‐12
Dec‐12
Feb‐13
Apr‐13
Jun‐13
Aug‐13
Oct‐13
Dec‐13
Feb‐14
Area
(Acres)
Area
Sinkhole Area Subsidence Area
Sinkhole & Subsidence Area Volume and Area
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Aug‐12
Oct‐12
Dec‐12
Feb‐13
Apr‐13
Jun‐13
Aug‐13
Oct‐13
Dec‐13
Feb‐14
Volume (Cub
ic yards)Millions
Volume
Total Subsidence VolumeSinkhole Volume
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Sinkhole and New South Berm Alignment
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Oxy 3 Cavern Tag Data—Vertical Depth
Solids interface near top of cavern
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Sinkhole Volume Compared to Oxy 3 Cavern Volume
Note: Final Oxy 3 cavern volume when mining ended in 2009 was estimated from the 2007 total cavern volume (sonar volume + bottom sludge) and the historical measured rate of cavern growth.
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Oxy 3A Casing and Tubing Pressure
Tubing pressure declining—that is
good
Pressure difference caused by oil and gas in casing
Well work‐over
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MEQ Event Histogram
Sinkhole Appears
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Active Sites
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MRAA Gas Area
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Bubble Site Intensity Changes ( Oct 2012 to Jan 2014)
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Gas Classification
New bubble site
click
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20.9
7.6
4.9 32.7
0
5
10
15
20
25
30
35
40
45
Total Volume Vented (mmcf) Daily Vent Rate (mcfd)
Gas Volum
e
In CommunityOutside Community
Status of Gas Venting
Data date: 3/6/2014
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TBC Community Venting Program
Well DateFlow Rate (mcfd)
Cum. Flow (mcf) FWHP (psig)
ORW‐36 3/6/2014 10.4 2,353 47.5ORW‐37 3/6/2014 0.0 249 0.0ORW‐46 3/6/2014 1.5 525 45.0ORW‐49 3/6/2014 2.7 408 46.0ORW‐50 3/6/2014 7.8 923 44.0ORW‐52 3/6/2014 1.0 208 48.0ORW‐53 3/6/2014 0.2 79 37.0ORW‐55 3/6/2014 8.3 139 48.0ORW‐56 3/6/2014 0.5 23 46.5ORW‐58 3/6/2014 0.2 5 12.0Total 32.7 4,911 ‐‐
Average 3.3 491 37.4
mcfd Thousands cubic feet per daymcf Thousands cubic feetFWHP Flowing wellhead pressurepsig Pounds per square inch gauge
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Pressure Monitoring Well Data
PMW‐18S
PMW‐16S
PMW‐19S
BC‐2
TBC‐3
No Pressure at PMW‐08S
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Pressure Monitoring Shut‐in Wellhead Pressures
0
10
20
30
40
50
60
9/3/2013 10/3/2013 11/2/2013 12/2/2013 1/1/2014 1/31/2014 3/2/2014
Wellhead Pressure (p
sig)
BC 2 PMW 16s PMW 18s PMW 19s TBC 3
PMW‐18S ~50’ from ORW‐52PMW‐19S ~50’ from ORW‐54
Well seal issues @ BC‐2
TBC‐03 No Pressure
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ORW Operations—Start of Venting
Aquitard
MRAA
GasGas
ORW
PMW
Gas to Flare
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ORW Operations—During Venting
Aquitard
MRAA
GasGas
ORW
PMW
Gas to Flare
Radius of Influence
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Option 1—No dewatering– Have to mitigate gas using only the excess gas pressure (3‐5 psig)– Keep wellhead pressure high to avoid “watering” out of well
• Initially gas pressure high enough to avoid “water” out• As gas is removed, in the immediate vicinity of the vent well, the gas pressure can
drop to MRAA water pressure and well fills with water
– ROI (radius of gas removal) will be relatively small– Need more, closer‐spaced vent wells– Longer time to mitigate gas
Option 2—With Dewatering– Gas mitigation using 40 to 50 psig pressure drops– Water controlled in well with dewatering pumps– ROI relatively larger – Fewer vent wells– Shorter gas mitigation time
MRAA Gas Mitigation—Options
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Concerns raised about subsidence because of vent well dewatering Community Dewatering Tests including Subsidence Monitoring– ORW‐38 test
• 10 psi pressure drop• Pumping for one week
– ORW‐21 test being• Water pressure drop of 40‐50 psi• Extensive monitoring for subsidence in vicinity of well
Subsidence (Consolidation ) Issue
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Thank You
Bayou Corne Community
Sinkhole
Grand Bayou