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CONDUCTIVITY OF COMPLEX
FRACTURING IN UNCONVENTIONAL
SHALE RESERVOIRSProject Number (11122-07)
PIs: Ding Zhu and Dan Hill
Texas A&M University
Petroleum Engineering Department
U.S. Department of Energy
National Energy Technology Laboratory
Mastering the Subsurface Through Technology, Innovation and Collaboration:
Carbon Storage and Oil and Natural Gas Technologies Review Meeting
August 16-18, 2016
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Benefit to the Program A better physics-based understanding of fracture conductivity
behavior in shale formations, which leads to:
‒ an improved fracture treatment design
‒ a more effective and economical hydraulic fracturing
‒ an improved fractured well performance
‒ a reduced environmental impact by reducing water and other materials
used in fracturing activities
A systematic experimental study of fracture conductivity in shale oil
and gas formations, including:
‒ Barnett shale
‒ Fayetteville shale
‒ Marcellus shale
‒ Eagle Ford shale
Addresses the concerns of conductivity measurement procedures and
mimics the field conditions for more accurate evaluation of conductivity
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Importance of Fracture Conductivity in Shale
3
0
1
2
3
0.1 1 10 100 1000
Sf
+ l
n (
Xf/
r w)
Dimensionless Fracture Conductivity
(Daniels et al., 2007; Cramer, 2014)
𝜎 𝜎𝑓
𝑝 > 𝜎𝑓
𝜎𝑝 ≤ 𝜎𝑓 𝜎𝑓
(Cinco-Ley and Samaniego, 1981)
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Reservoir Conditions and Frac Design
(USGS Fact S. 2008-3021; Hexion fracline, 2009; Sunday Udoh, 2013; Zhang, 2014; Murex Petro. Corp., 2014; A. Plas Otwe, 2014)
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Project Overview: Goals and Objectives
Build shale baseline frac conductivity database
‒ Rocks: Barnett, Fayetteville, Eagle Ford, Marcellus, Bakken
‒ Fracture: natural fracture, induced fracture; unpropped, propped
‒ Proppant: 100, 40/70, 30/70, 30/50; Predominantly ≤ 0.20 lb/ft2
Correlate shale frac conductivity with rock properties
‒ Mineralogical: clay-rich shale, carbonate-rich, silica-rich
‒ Mechanical: elastic properties of shale
‒ Structural: fracture orientation and surface roughness
Investigate the conductivity damage by water
‒ Mineralogical: clay softening
‒ Damage mechanisms
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6 66
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2. Coat samples 3. Place proppants
4. Mod. API cell 5. Measurement
1. Induce fracture
6. Analysis
Con
du
ctiv
ity (
md
-ft)
Clo
sure
str
ess
(psi
)
Time (min)
2.5”
2.5”
1”
Conductivity Experimental Procedure
8
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Triaxial Compression Test Setup
Triaxial test:
mechanical
properties (E, u)
Brinell hardness
test
profilometer:
topography
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0.1
1
10
100
1000
0 500 1000 1500 2000 2500 3000 3500 4000 4500
Fra
ctu
re C
on
du
ctiv
ity (
md
-ft)
Closure stress (psi)
0.1
1
10
100
1000
0 500 1000 1500 2000 2500 3000 3500 4000 4500F
ract
ure
Con
du
ctiv
ity (
md
-ft)
Closure Stress (psi)
Cemented
FilledUnfilled
With infill in fracture Without infill in fracture
Unfilled
Cemented
Filled
Cemented Filled Unfilled
Barnett: Unpropped Natural Fracture
10
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0.1
1
10
100
1000
0 500 1000 1500 2000 2500 3000 3500 4000 4500
Fract
ure
Con
du
ctiv
ity
(m
d-f
t)
Closure Stress (psi)
Sample41 - Debris removed
Sample26 - Debris removed
Sample16 - Debris removed
Sample15 - Debris kept
Sample19 - Debris kept
Sample18 - Debris kept
Sample29 - Debris kept
Barnett: Unpropped Aligned Fracture
11
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Marcellus: Downhole Core vs.
Outcrop Samples
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0.1
1
10
100
1000
0 500 1000 1500 2000 2500 3000 3500 4000 4500
Fract
ure
Con
du
ctiv
ity
(m
d-f
t)
Closure Stress (psi)
Eagle Ford
FL3,
Fayetteville
Unpropped Aligned Fracture
(Z sample orientation)
FL2, Fayetteville
Barnett
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Mineralogy and Rock Brittleness
0%
20%
40%
60%
80%
100%
Quartz Clay Carbonate Other
Perc
en
tage
Barnett FL2
FL3 Eagle Ford
(Jarvie et al., 2007; Wang and Gale, 2009)
15
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Unpropped Fracture Conductivity
and Rock Brittleness
0.1
1
10
100
0.00
0.30
0.60
0.90
Barnett FL2 FL3 Eagle Ford
Fract
ure
Con
du
ctiv
ity
(m
d-f
t)
Bri
ttle
nes
s (-
)
Brittleness Unpropped conductivity, 3,000 psi
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0.1
1
10
100
1000
0 500 1000 1500 2000 2500 3000 3500 4000 4500
Fract
ure
Con
du
ctiv
ity
(m
d-f
t)
Closure Stress (psi)
FL2, Fayetteville
Eagle Ford
FL3,
Fayetteville
Barnett
Conductivity Difference Explained
(Z sample orientation)
• Higher quartz content
(silica), smaller grain size
• Rougher fracture surface
• Blocky fracture surface
fragments
• Higher carbonate/clay
content with larger grain size
• Flatter fracture surface
• Flat, flaky fracture surface
fragments
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Unpropped vs. Propped Fracture:
Fayetteville
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Eagle Ford, Zone B100 Mesh Sand
19
unpropped
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Sample Orientation
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Marcellus, Elimsport: Conductivity
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Marcellus, Allenwood: Conductivity
(Z = horizontal sample orientation)
(X0 = vertical sample orientation)22
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Eagle Ford Outcrop: Lozier Canyon
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Comprehensive Study
Fracture conductivity, unpropped, propped with
different size and concentration
Mechanical property: Young’s Modulus and
Poisson’s Ratio
Surface topography
Brinell hardness
Brittleness
Sample orientation
24
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Conductivity for 100-Mesh
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Brinell Hardness Number
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Fracture Conductivity at 6,000 psi vs
Poisson’s Ratio
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10
100
1000
10000
500 1500 2500 3500 4500 5500 6500
Frac
ture
Co
nd
uct
ivit
y [m
d-f
t]
Closure Stress [psi]
A C
D E
B
D & E: BI= 0.05
A, B & C: BI= 0.12
Brittleness Effect on Conductivity
100 Mesh Sand @ 0.10 lb/ft^2
26
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0.1
1.0
10.0
100.0
1000.0
0 500 1000 1500 2000 2500 3000 3500 4000
Me
asu
red
Co
nd
uct
ivit
y [m
d-f
t]
Closure Stress [psi]
EF AVG
FL2 AVG
FL3 AVG
Unpropped Conductivity Correlation
27
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0.1
1
10
100
1000
0 500 1000 1500 2000 2500 3000
Me
asu
red
Co
nd
uct
ivit
y [m
D-f
t]
Closure Stress [psi]
0.1
1
10
100
1000
0 1000 2000 3000 4000
Me
asu
red
Co
nd
uct
ivit
y [m
D-f
t]
Closure Stress [psi]
General Observation
Magnitude of initial
conductivity is dominated
by surface topography
Conductivity decline rate
is controlled by
mechanical properties
30
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Water Damage
29
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Water Damage to Conductivity
in Shale Formation
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Accomplishments to Date
A comprehensive experimental database of fracture conductivity in shale oil and
gas formations, including:
‒ Barnett shale, Fayetteville shale, Marcellus shale, and Eagle Ford shale
Unpropped and propped fracture conductivity behavior due to:
‒ fracture alignment
‒ closure stress
‒ rock mechanical properties
‒ mineralogy
‒ fracture orientation
‒ proppant type and concentration
Water-induced fracture conductivity impairment
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Summary
Unpropped natural fracture conductivity is significant and important in
unconventional reservoir fracturing. It is orders of magnitudes smaller than propped
conductivity
Samples obtained from downhole cores tend to have a higher unpropped
conductivity due to a larger amount of debris generated and removed during the
process of inducing fracture.
Orientation of samples only has impact on tested conductivity when mechanical
property is anisotropic. When it does, the conductivity can be an order of magnitude
smaller
Surface mechanical properties (Brinell Hardness) and topography (surface area)
show a direct impact on fracture conductivity, specially unpropped. Higher hardness
results in a higher conductivity.
Effect of mineralogy on conductivity in terms of Brittleness showed that higher
brittleness yields higher conductivity.
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Organization Chart and
Industrial Collaboration Two faculty:
‒ Professor Ding Zhu
‒ Professor Dan Hill
9 MS students with thesis
4 PhD students with dissertation
Industrial support
Southwestern Energy
Pioneer
Hess
StimLab
Carbo Ceramics
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Gantt Chart
35
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Bibliography
1. Zhang, J., Kamenov, A., Zhu, D., and Hill, A.D., Laboratory Measurement of Hydraulic Fracture
Conductivities in the Barnett Shale, SPE Paper 163839, presented at the SPE Hydraulic Fracturing
Technology Conference, The Woodlands, TX, 2013.
2. Ouyang, L., Zhu, D., and Hill, A.D., Theoretical and Numerical Simulation of Herschel-Bulkley Fluid Flow in
Propped Fractures, IPTC 17011, presented at the SPE International Petroleum Technology Conference,
Beijing, China, March 26-28, 2013.
3. Zhang, J., Zhu, D., and Hill, A.D., Propped Fracture Conductivity in Shales, OMAE 2013-11603, presented
at the ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering, Nates,
France, June 9-14 2013.
4. Zhang, J., Hill A. D., and Zhu, D. :Experimental and Numerical Studies of Reduced Fracture Conductivity
due to Proppant Embedment in Shale Reservoir, SPE paper 170775 prepared for presentation at the SPE
Annual Technical Conference and Exhibition held in Amsterdam, The Netherlands, 27–29 October 2014.
5. Briggs, K., Hill, A. D., Zhu, D., and Olsen, K.: The Relationship between Rock Properties and Fracture
Conductivity in the Fayetteville Shale, SPE paper 170790 prepared for presentation at the SPE Annual
Technical Conference and Exhibition held in Amsterdam, The Netherlands, 27–29 October 2014.
6. Jansen, T, Zhu, D. and Hill, A. D.: The Effect of Rock Mechanical Properties on Fracture Conductivity for
Shale Formations, SPE paper 170337 prepared for the 2015 SPE Hydraulic Fracturing Technology
Conference, Woodlands, Texas, January 2015.
7. McGinley, M., Zhu, D. and Hill, A. D., The Effects of Fracture Orientation and Elastic Properties on Hydraulic
Fracture Conductivity, SPE paper 174870 accepted for 2015 SPE Annual Technical Conference and
Exhibition to be held 28 – 30 September, 2015 in Houston, TX, USA.
8. P. Perez Pena, D. Zhu, and A. D. Hill : The Effect of Rock Properties on Fracture Conductivity in the
Marcellus Shale, SPE-181867, Asia Pacific Hydraulic Fracture Conference, August 2016, Beijing, China
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QUESTIONS?
36