Drilling horizontal wells is the common mode of operation for field development in permeability-challenged unconventional reservoirs such as an organic shale. Assumptions are made regarding the homogeneity of the reservoir as wells are drilled away from the vertical pilot well. It is assumed that the reservoir characteristics remain uniform and that the structure is known to remain in a constant orientation based on the dip information at the pilot wellbore. Experience tells us that these assumptions can lead to wells placed out of zone and in rocks with much different reservoir quality and stress magnitude, which can adversely affect the well’s production potential. Lateral measurements and petrophysical interpretations can be used to define variations in reservoir and completion quality, which can be used to optimally place perforation clusters in similar rock to increase production vs. peer geometric wells. A methodology to integrate data from many sources enables a better understanding of the variability and structural challenges of these complex reservoirs. This integrated methodology has been refined using learnings from various case studies that show increased production compared with results from geometric completions.
Kevin is currently the Chief Petrophysicist at Rock Oil Company. Recently, Kevin retired from Schlumberger as a Senior Petrophysicist based in Houston, TX with nearly 27 years of experience in petrophysics and rock physics, after graduating from the University of Tulsa with a degree in Petroleum Engineering. While at Schlumberger, he worked in the Production Technology Integration Center focusing on unconventional resource plays, mainly in the Eagle Ford and Permian basins. Additional areas of expertise have been deep water and shelf structures in the Gulf of Mexico, tight gas sands in South TX and Rockies, Alaska, Permian Basin, Unconventional Gas & Oil shales, Coal Bed Methane and international (Australia, Brazil, Argentina, United Kingdom, France, Nigeria, Angola, Turkey and Saudi Arabia).
Kevin is a guest lecturer since 2012 at Rice University for a graduate level petroleum geology class entitled “Economic Geology – Petroleum”.
Integration From Multiple Disciplines in Horizontal Well Evaluations to Increase Production in Organic Rich Shales by Kevin Fisher
1. Primary funding is provided by
The SPE Foundation through member donations
and a contribution from Offshore Europe
The Society is grateful to those companies that allow their
professionals to serve as lecturers
Additional support provided by AIME
Society of Petroleum Engineers
Distinguished Lecturer Program
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2. Society of Petroleum Engineers
Distinguished Lecturer Program
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Kevin Fisher
Multi-Discipline Approach to Increasing
Production in Organic Rich Shales
6. Production is Not Uniform
6
Production Log Examples
Only 64% of the Perforation
Clusters are contributing
All wells were completed
Geometrically
61%
62%
67% 59%
69%
Miller-SPE-144326-MS-P 2011
7. Horizontal Production Log
• Evaluation of Production Log Data
from Horizontal wells Drilled in
Organic Shales
– Miller-SPE-144326-MS-P-2011
• Designed specifically for horizontal
wells
88 degrees 90 degrees 92 degrees
7
8. Fiber Optics
Geometric Design Engineered Design
8Anifowoshe, et al, SPE-184051-MS
5
5
5
5
4
4
5
5
Clusters
Clusters
Time Time
9. Case Study: Eagle Ford Consortium
Original Hypothesis:
1. “In a horizontal well placed in good
Reservoir Quality rock with lateral
variation in stress, a more effective
stimulation can be achieved by
grouping similarly stressed rock for
treatment.”
2. “This will be characterized by a
reduced number of perforation
clusters showing no productivity,
leading to better overall recovery
and drainage”
9Slocombe, et al, SPE 13ATCE-P-166242 2013
10. Unconventional Reservoir
Optimized Completion (U-ROC)
Field
Development
Well
Optimization
Asset
performance
Petroleum
systems
modeling
Reservoir
quality
Well
design
Stimulation
design
Production
simulation
Drilling and
Completion
Quality
Seismic
interpretation
Geological
framework
Geomechanics
Completion
optimization
Microseismic
monitoring
10
Geology Quality
Reservoir Quality
Completion Quality
The keys to Completion Optimization
11. Geology Quality: GQ
• Analog – Outcrop
• Landing Point
• “Like Rock”
• Pilot to Lateral correlations
11
21. Pilot and Lateral Integration
21
Lateral curtain
73 boepd per stage 18 boepd per stage
15 feet
22. Case Study:
RQ vs. Rock Groups
Time Lapse Production Log
• 2 production logs run 6
weeks apart
• Delta Hydrocarbon
22
Good RQ
-5 bpd
Bad RQ
-14 bpd
26. Engineered Completion
Results: 940 bopd / 375 bwpd
26
85.3% Perforation Efficiency
64% Average Perforation Efficiency for Geometric Designs
27. Production Comparison
27
2
5
10
20
30
40
50
60
70
80
90
95
98
- 2. 33
- 1. 83
- 1. 33
- 0. 83
- 0. 33
0. 17
0. 67
1. 17
1. 67
2. 17
10 100 1,000 10,000
CumulativeProbability
Max Month Average BOE, BOE/D
Max Month Average
799 BOE/D
48.5% increase in
production
20 Offset Wells
Cum GOR: 0 – 3,000 scf/bbl
1 BOE = 1 bbl oil or 6 Mscf gas
28. Increased Production –
Engineered vs. Geometric
Well
Best 1 month
bpd
P50 of
Offsets
bpd
% Production
Increase
Well A 799 538 48.50%
Well B 1258 499 152.10%
Well G 950 798 19.00%
Well H 560 392 42.90%
Well I* 730 789 -7.50%
Well J 1100 392 180.60%
Well K 771 495 55.80%
Average 881 558 58.0%
* 1/3 of lateral out of zone
29. Eagle Ford Consortium Results
• Increased perforation efficiency from 64% to
82% (28% increase in lateral contribution)
• Increased well performance by an average of
58% vs. average offsets
• 28% increase in lateral contribution yields a
58% increase production (Not Linear)
29Slocombe, et al, SPE 13ATCE-P-166242 2013
34. Lessons Learned
• Geology Quality (GQ)
– Layers and landing point is critical to production.
• Reservoir Quality (RQ)
– Near wellbore has influence in the over flushed
stimulated fracture zone.
• Completion Quality (CQ)
– Perforations in similar stress rock initiate
simultaneously.
– Fracture modeling
34
35. Conclusion
Integrating Geology Quality (GQ), Reservoir
Quality (RQ) and Completion Quality (CQ) in the
engineered designed completion leads to
increased production when compared to peer
wells with geometric designed completions.
35
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37. References
• Miller, SPE-144326-MS-P, 2011
• Slocombe, et al, SPE 13ATCE-P-166242, 2013
• Donovan, URTeC 1580954, 2013
• Anifowoshe, et al, SPE-184051-MS, 2016
• Kreimeier, et al, URTeC 2461822, 2016
• Xu, et al, SPE-179110-MS, 2016
• Calvin, et al, SPE-175961-MS, 2015
• Wigger, et al, SPE 14UNCV-167726-MS, 2014
37
38. Thank You For Attending!
Question & Answer Session
38