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Microhole Coiled Tubing Drilling Cost Effective Access For CO2 Sequestration
Regional Carbon Sequestration Partnerships Review MeetingPittsburgh, PAOctober 3, 2006
Kent F. Perry
Gas Technology Institute
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Topics
> Microhole Coiled Tubing Drilling
> Applications to CO2 Sequestration
> Coiled Tubing Field Test Results – How They Might Apply to CO2 Activities
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Advanced Drilling Technologies Coiled Tubing Rig
Rig FeaturesHandles 1” thru 2 5/8 ”Coiled Tubing
5000’ Depth Capability
Zero Discharge MudSystem
Handles 7 5/8” R3 Casing
Supports Rotary & Top Drive
Trailer Mounted Rig –Meets USDOT Limitations
Moves w/4Loads
• Rig Drilled +220 Wells in 2005 • Drills 3000’ Wells at Rate of One/Day
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NiobraraArea
of Activities
Area of Drilling Activity
Googleearth.com
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8 3/4” open hole to 376 ft.5 1/2” casing @ 376 cemented with 145 sacks neat cement
Surface
Estimated Cost Savings From Conventional Rig from
25% to 35% per well
Conventional Well = $125,000Microhole = $88,000
4 ¾” Open Hole to 1180 ft.2 7/8” “ casing @ 1179’ cemented w/45 sacks
Cement
Niobrara Chalk Formation
k = .002 md - .5 mdPorosity = 20 -35%IP After Frac = 30 - 50 Mcf/day
Microhole Well Completion – Goodland, Kansas Niobrara
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Potential Applications to CO2
Sequestration
> Inventory Verification
> Leak Mitigation
> Reservoir (Caprock) Integrity Testing
> Long Term Monitoring
> Injection Wells
From: CO2 Capture Project
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Potential Well Types
Shallow Water Supply
Caprock
PossibleSpill Point
Gas Zone
Aquifer
Gas Storage
Well
PermeableZone Above
CaprockWater Well
GroundSurface
PermeableMonitoring
Zone
Gas Fingering
From: CO2 Capture Project
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Leak Control Technology
Shallow GasRecovery
Well
Observation Well
Shallow GasAccumulation
Sandstone
Lower Aquifer Pressure
Gas Recycle
Seal Leak
From: CO2 Capture Project
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Reservoir Integrity Testing
WaterProduced
At High Rate(2750 Bbls/Day)
Caprock
Water Zone
Surface
Pump Test Well
Observation Well Above
Caprock
WaterObservation Well Within
AquiferDelta P CreatedAcross Caprock
From: CO2 Capture Project
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Field Results and Cost Savings
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Rig Mobilization
50 Feet
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Mobilization
Mud Tanks
Dog House
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Number of staff: 4 to 6
Rig Up: 4
Drilling to target: 4
Running casing and cementing: 5
Reduce Drilling Cost-Staff
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PDC BitSize: 4.75 inches
Life: 30 to 40 Wells
Mud MotorOD: 3.75 inches - 5/6 Lobe
Bottom Hole Assembly (BHA)
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Drilling Rate – Ft/Hr – 23 Project Wells -4 ¾” Holes – Chronological Order
0
100
200
300
400
500
600
DuellIrv
inGuts
chTopli
ffMelb
aBrad
shaw Rita
Crumrin
eLinen
1Linen
1MConr
adEmmaVilli
nes
Moore 13
Moore 33
Ella M
ay 22
Ella M
ae 14
Walter2
1Rudo
lphAlvi
n
Isern
hagen
12
Isern
hagen
21Walte
r 33
Ave
rage
RO
P - F
t/Hr
ROP Range = 200 to 500 ft/hr
First WellsMay, 2005
Bit DesignChange
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Reduce Drilling Cost- Mud
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Decreased Environmental Impact
Small Drill PadsNo Mud PitSmaller Equipment Yields Fewer Air EmissionsSmaller Wellbore - Less Drilling Mud Smaller Access RoadsMinimum noise
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Zero Discharge Mud System
No Earthen PitsAll Cuttings and Drilling Fluid Confined to TanksRig Up on Sealed/Booted Tarp For Any Overflow or Spill
ContainmentAuger Hole for Conductor and Boot Around Conductor
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Reduce Drilling Cost- Location
50ft 70ft
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Allocation of Rig Time – 3100’ Well Total Time = 19 Hours
Casing/Cement20%
MIRU - RDMO16%
Pick Up BHA16%
Drilling21%
Lay Down BHA16%
Logging11%
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Benefits of Rig Utilization
> Efficient Rig Mobilization
> Small Environmental Footprint
> Rapid Drilling
> Good Hole Quality and Cement
> Rig Capable of Drilling, Running Casing, Tool Handling, Logging
> Benefits of Continuous Tubing
> Low Noise, Emissions
> Mud Recycle, Minimum Cuttings and Zero Discharge if Required
> Improved Safety
Saves Money, Environment and Enables Marginal
Resources
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Barriers to Microhole Usage> Production Engineers Have Long Term Concerns
– Ability to Rework Wells
– Handling of Significant Fluids
– Limited Space for Mechanical Equipment
– Future Use of Wellbores
> Lack of Experience/Familiarity
> Depth Limitation
> Difficult Drilling Environments – Stuck Pipe
> Issues with State of Colorado – Ability to Adequately Complete Wells, P&A
> Hard Formations – Heavy Muds
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U.S. Onshore Drilling By Depth Interval
0
10,000
20,000
30,000
40,000
50,000
60,000
1990
1992
1994
1996
1998
2000
2002
2004
2006
2008
2010
2012
2014
2016
2018
2020
2022
2024
Year
All
Wel
ls p
er Y
ear
>15k10-15k5-10k0-5k
Actual Forecast
Source: EEA Base Case January 2006
$3.4 Billion Savings
Avg Day Rate 1999 = < $6000; 2005 = > $12,000
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Activity Trend Rig Has Drilled + 300,000 Feet of Hole• Colorado – Kansas
Microhole Well Numbers Increasing • Total Has Grown to + 40
2900’ – 6 ¼ “Wells Drilled in One DayDrilling Faster Than PermittingSecond Rig Built and Running; Third
UnderwaySignificant Interest in Additional Rigs
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Summary
> “Fit For Purpose” Microhole Coiled Tubing Drilling– Less Impact on the Environment
– Fast and Efficient
– Enhances Safety
> Saves Money– Enables the Development of Marginal Oil and Gas
Resources– Can Enable Cost Effective CO2 Sequestration
> Future Direction– Smaller Holes, Horizontal Capabilities
– DOE is Leading a Systems Approach Effort for MicroholeDrilling