improving the effectiveness and managing the impact of ...members.igu.org/old/igu...
TRANSCRIPT
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Improving the Effectiveness
and Managing the Impact of
Hydraulic Fracturing Guy Lewis
Gas Technology Institute
IGRC October 2011
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Topics
• Who is GTI
• Hydraulic Fracturing & Unconventional Gas
– Brief History
– Hydraulic Fracturing Research
• Societal Concerns
– Fracturing and Water
• Water Required
• Fluids Injected
• Fluid Flow Back
– Other Issues
• Looking Ahead
– Role of Collaboration
– Next R&D Opportunities
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GTI takes on important energy challenges, turning raw technology into practical solutions that create exceptional value for our customers in the global marketplace.
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> Not-for-profit research, with 70 year history
> Facilities
─ 18 acre campus near Chicago
─ 300,000 ft2, 28 specialized labs
─ Other sites
─ $140 M installed R&D and testing capacity
> Staff of 250
> 1000 patents; 500 products
> 13 spin-out companies
Energy & Environmental Technology Center
Flex-Fuel
Test
Facility Offices
& Labs
GTI Overview
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Unconventional Gas
Conventional gas = harder to find, easier to produce. Unconventional gas = easier to find, harder to produce.
Requires some type of stimulation (e.g. hydraulic fracturing) for economic production.
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U.S. is Self Sufficient for
100 Years
U.S.
Technically
Recoverable
Resource
(Tcf)
100 year supply
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Abundant Supply Leads to Expanded
Use
End Use
Power
Transportation
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Key Technologies Unlocked
Shale
• Horizontal Wells
• Hydraulic Fracturing
• Seismic Imaging
George Mitchell, Pioneer of the U.S. shale gas revolution
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Barnett Production
Completion engineers at the firm took a chance and
started experimenting with water fracs that
proved successful.
At the same time Mitchell scientists using techniques
developed by the Gas Technology Institute
did a new core study with state of the art technology
that proved the gas in place figures were actually
four times more than previously believed.
From AAPG Explorer
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A Global Resource
New EIA Study:
• 6622 Tcf recoverable shale
• 22,600 Tcf recoverable natural gas Global shale adds 40%!
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Hydraulic Fracturing
Fresh Water Aquifer Fresh Water Aquifer
Fresh Water Aquifer
Gas Zone
Hydraulic Fracturing Fluid In Flow Back Fluid Out
Surface
Fresh Water
Geologic Formations
Surface Casing and Cement to Surface
Protects all Fresh Water Aquifers
Brackish Water
Production Casing Cemented Across All Formations
Required to Control Flow of Fluids in Wellbore Region
Hydraulic Fracture
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First Treatment
1947
Hugoton
400,000
Treatments
800,000
Treatments
+ 1,000,000
Wells Hydraulically
Fracture Treated
Hydraulic Fracturing
Timeline
SPE Papers 801, 22392, 36166, IOGCC, Halliburton
MHF’s
Treatments
Patent 1949
Stanolind
(Amoco)
Shale Gas Multi-
stage HZ wells
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Kerosene &
Diesel
First Fluids
Napalm for
Gelling
Post- WWII
Fatty Acids
and
Caustic
Movement
Toward Simpler
and
―Green‖ Fluids
Hydraulic Fracturing Fluids
Av
era
ge J
ob
Siz
e
(Gallo
ns F
luid
)
SPE Papers 22392, 36166, Halliburton
Crosslinked
Gels
Foams
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Hydraulic Fracturing Research
Staged Field Experiments
M-Site Hydraulic Fracturing Research
Mounds Hydraulic Fracturing Research
Experiment
• Multiple Wells
• Tilt meters
• Inclinometers
•Coring of Created
Fractures
• Modeling
• Microseismic
•Full Geologic
Characterization
•Multiple Fracture
Treatments
• Seismic
• Colored Proppants
• Tracers
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Atoka Shale Stage OA
1800
1900
2000
2100
2200
-400 -300 -200 -100 0 100 200 300 400
Xf, ft
-125
-75
-25
25
0 50 100 150 200
Depth
Fracture Azimuth
Perforations
Fracture Length
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Atoka Shale Stage 19
1800
1900
2000
2100
2200
-400 -300 -200 -100 0 100 200 300 400
Xf, ft
-125
-75
-25
25
0 50 100 150 200
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Atoka Shale All
1800
1900
2000
2100
2200
-400 -300 -200 -100 0 100 200 300 400
Xf, ft
-125
-75
-25
25
0 50 100 150 200
Formation Cored Above
Formation Cored Within Fracture Zone
Formation Cored Below
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Multiple Fractures Created
-125
-75
-25
25
0 50 100 150 200
―Field experiences indicate injections interrupted by shut-
in periods do not result in a single fracture, but may result
in multiple fractures around the point of injection.‖
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Gas Shale—Two Rocks
Organic Clay Rich Shale Produces adsorbed gas
Quartz Rich Shale Produces free gas
They may look the same, but they have very different production performance profiles.
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Gas Shales and Other Unconventional Gas
Resources
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Barnett Shale Gas Recovery per Well
Gas Recovery per Well - mmcf
1 100 10 10000 1000
4034 Wells
Maximum Recovery per Well = 9.139 Bcf
Minimum = .026 Bcf
Average = 1.1 Bcf
IP
1.0
.
1
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NOT SO FAST!
Negative Media and Public
Sentiment
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Shale Gas Concerns…Not
Just Water
• Water quality and availability
• Air quality
• Noise
• Truck traffic & CO2 produced
• Surface disturbance
• Methane emissions
• Solid waste generation
• Induced seismicity
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Issues—Why Now?
• Significant Activity in New and Populated Areas
• Complex Process
• Environmental Concerns
• Water Usage
• Chemicals
• Press—Good News is not News
• Internet
• Solution = Good Science, Transparency and Information that is
Easy to Understand
The Science of Human Behavior as Much as
the Science of Fluid Rheology
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Drilling Footprint
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Induced Seismicity
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Wellheads on Pad Location Prior to
Fracing
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Opportunities for Environmental
Mitigation
• Good Science
• Transparency
• Base Lining
• Pad Drilling Technology
• Unitization
• Technology—All Areas
• Information to Offset
Misinformation
• Social Networking
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Groundwater Contamination
Where is the Risk?
• Hydraulic fracturing—Unknown: Occurrences and risk factors
likely very low and localized.
• Septic systems—Known: Occurrences and risk factors likely high
and localized but also cumulative.
• Storm water—Known: Occurrences and risk factors not fully
quantified but likely high and widespread.
• Pesticides and nutrients—Known: Occurrences and risk factors
not fully quantified but likely very high and widespread
Ground Water Protection Council (GWPC)
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0
500
1000
1500
2005 2010 (Projected)
Mu
nic
ipal
Ste
am
Ele
ctr
ic
Irri
gati
on
Man
ufa
c
turi
ng
Liv
esto
ck
Min
ing
Barn
ett
Dri
llin
g
An
nu
al
Wate
r U
se
1000’s
Acre
-Feet Natural Gas Development
Freshwater Users in the Barnett Shale
Region
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NYSERDA - 2009
Water = 90.6%
Hydraulic Fracturing
What Goes In?
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Fracturing Fluid Additives and Usage
Additive Main
Compound
Common Use
Diluted Acid Hydrochloric or
Muriatic Acid
Swimming Pools
Biocide Glutaraldehyde Dental Disinfectant
Breaker Ammonium
Persulfate
Bleaching Hair
Crosslinker Borate Salts Laundry Detergents
Iron Control Citric Acid Food Additive
Gelling Agent Guar Gum Biscuits
Scale Inhibitor Ethylene Glycol Antifreeze
Surfactant Isopropanol Glass Cleaner
Friction Reducer Polyacrylamide Water and Soil
Treatment
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Selected Metals in Flow Back Water—Samples
from Two Locations
Metal ** 14-d FB 14-d FB Median 95th % ile
Chromium
(Cr3+)
ND ND 35 314
Copper ND 0.023 511 1,382
Nickel ND 0.033 22.6 84.5
Zinc 0.06 0.18 705 1,985
Lead ND ND 65 202
Cadmium ND 0.002 2.3 7.4
Mercury 0.000049 0.000027 1.5 6.0
Arsenic 0.05 0.017 3.6 18.7
Location A Location B
* mg/l; ND=Non Detect
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Selected Metals in Flow Back Water—Samples
from Two Locations
Metal ** 14-d FB 14-d FB Median 95th % ile
Chromium
(Cr3+) ND ND 35 314
Copper ND 0.023 511 1,382
Nickel ND 0.033 22.6 84.5
Zinc 0.06 0.18 705 1,985
Lead ND ND 65 202
Cadmium ND 0.002 2.3 7.4
Mercury 0.000049 0.000027 1.5 6.0
Arsenic 0.05 0.017 3.6 18.7
Location A Location B
* mg/l; ND=Non Detect ** Penn State, 2000
POTW Sludges**
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Fracture height relative to groundwater
aquifers (feet)
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Beneficial Use
Deep under the flatlands of Midland, Michigan, lie
salt-rich rocks, rich in magnesium, chlorine, calcium,
sodium and bromine. Inside these rocks, Herbert
Dow found the raw materials of creative chemistry
(1897).
Road Salt – $56 per ton
Road Brine – $.63 per gallon
Bromine - $1,128 per ton
Fresh Water $ ?
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Multiple Benefits Stemming
from Water Reuse
• Greatly reduced potential for environmental impact
• Reduced ton-miles in water transportation
• Decreased air emissions
• Decreased carbon footprint
• Lower truck traffic densities
• Reduced road wear
• Greater stakeholder acceptance
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New Developments Under
Way
• New concepts in high efficiency thermal systems for water reuse
applications
• Novel coatings for improved membrane process performance
• New electrocoagulation designs with expanded capabilities for
pretreatment
• Electrodialysis processing for economical partial demineralization
• New friction reducing compounds that perform well at high salt
concentrations
• Combining processes to reduce costs
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What’s Still Missing
• Information sharing to help minimize costs, reduce
commercial risk, and minimize environmental impacts
• Strategic partnerships to enable comprehensive
solutions
• Identification and consistent application of sustainable
operating practices
• Consideration of full life cycle costs
• Further reductions in impact and improvements in
effectiveness
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Source: Engelder, 2008
Example—Marcellus Shale
Play
Reservoir Depth 1,500-8,000 ft
Thickness 50-300 ft
Total Organic Content (TOC) 5.3% - 7.8%
Thermal Maturity (Ro) 0.6%-3.0%
Average log porosity 5.5%
- 7.5%
Pressure (psi/ft) 0.42-0.7
Water saturation (Sw) 12%
- 35%
Gas in place (bcf section) 30-150
AnticipatFactor ~30%
Average EUe recovery R / Hrztl well (bcf)
3.75
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Hydraulic Fracturing Fracture Diagnostics
Effectiveness of hydraulic fracturing based
on microseismic imaging (SRV), pumping
diagnostics, and production results
•Quality control of surface and borehole
microseismic analysis—velocity model
calibration, fracture geometry and
attributes, SRV comparison, check shots
•Optimization of hydraulic fracture
treatments through examination of created
fracture geometry and complexity, coupled
with production results
Hydraulic Fracturing—
Diagnostics
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Local Setting
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Well Placement
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Surface Microseismic
• 1082 stations in the array.
They are represented as
blue spheres.
• The array consists of 10
lines radiating away from
the well head.
• Wells A through G are
shown in red.
• Data was acquired with the
GSR recording system at
2ms sample rate.
• VSP used for seismic
velocity profile
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Borehole Microseismic
Geophone
Array
• Horizontal Array—8
Shuttles spaced 100 ft.
apart
• Array positioned in Well-
C
• Array moved to 5
positions during course
of zipper-frac
treatments.
• VSP used for velocity
profile & Perforations
check shots used to re-
calibrate velocity model
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Microseismic Results
Surface
Microseismic
Borehole
Microseismic
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Frac Design Optimization—
Normalized Gas Production
Rates
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Fracture Characteristics Derived
from Microseismic Survey
Simple Fractures Complex
Fracture
Network
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52
1960’s 1980’s 2000’s
Nuclear
Stimulation Massive Hydraulic
Fractures
Precise Size & Precise
Placement
From Pinnacle Technology
Creating Permeability
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Why Some Treatments Do
Not Work as Well as
Expected • Fracture treatment grew out of zone.
• Propping agent settled to the bottom of the fracture.
• Propping agent was crushed or was embedded into the formation.
• Fracture fluid did not break.
• Fracture fluid broke too soon.
• Treatment volume was too small.
• Reservoir quality is less than expected.
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Productivity Loss Due to
Fracturing Induced Damage
• Liquids Invade the Near Wellbore/Fracture Region
• Use of Polymer Gels Can Aggravate Loss in Well Deliverability
• We Aim to Understand Factors Affecting Cleanup of Gel Induced Damage
• Lab Testing—Model Development and Field Verification
Areal view of
fractured gas well
Trapped
Liquid
Production
Well
University of Tulsa
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Sustaining Fracture Area and Conductivity of Gas
Shale Reservoirs for Enhancing Long-term
Production and Recovery
• Theoretical and experimental
project to understand the multiple
causes of loss of fracture area
and fracture conductivity
• Define solutions to mitigate the
resulting loss of production
• Identify optimal proppants,
fracture fluids, and pumping
schedules for the rock being
produced
clay-rich (argillaceous)mudstones
silica-rich (siliceous)mudstones
Texas Engineering Experiment Station/Texas A&M University System
And TerraTek a Schlumberger Company
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Improving Fracturing
Effectiveness
• Inadequate design
• Wrong proppant loadings
• Poor fluid selection
• Proppant embedment
• Poor fracture fluid clean-up
• Water blockage of permeability
• Poorly understood reservoir compartmentalization
Expensive process with 50% fractures sub-optimal
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Potential Experimental
Procedure
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Collaborative Development
• Bringing together the right partners and technology-based solutions
• Government and Regulators
• E&P Operators
• Service Companies
• Universities
• Consulting Firms
• Private Research Organizations
• Energy Associations
• Geological Surveys
Technology
Integration &
Transfer – GTI Formation
Evaluation
Restech
Reservoir
Engineering
Texas A&M
Geochemical Analysis
Amherst & U Mass
Geologic Studies
BEG
Field Data Acquisition,
Environmental Studies,
Coordination and
Integration
Best Practice Analysis
West Virginia University
Fracture Modeling
and Diagnostics
Pinnacle & Texas
A&M
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Collaboration Requirements for
Shale Gas Development
People and
culture
Process and
governance Technology
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Addressing Fracing Issues
• Acknowledge that lack of trust is an issue
• Public is seeking information from a
knowledgeable and credible source
• Facts alone may not be sufficient
• How stakeholders are engaged as important
as the facts
• Not an ―academic‖ scientific discussion
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Transforming our Energy
Future
• Abundant supplies
• Enhanced security
• Price stability
• Smaller carbon footprint
• Economic benefit