American Oil and Gas Reporter - September 2018 - 51

SpecialReport: Horizontal Wellbore Construction
development costs can be lowered through
the combination of reduced completion
costs and increased well productivity. The
three case study wells have achieved a 15
percent average reduction in per barrel
F&D costs while producing 170-250 percent more than their best offsets during
the same number of producing days. r

FIGURE 5
Post-Frac Production Log Evaluation using DAS/DTS Data
(Middle Bakken Well)
Spectrum (dB)
48

4,4

Pressure (psia)
52
50
4,4
4,4

54
4,4

90 140

PSD - Frequency Range: (1,781, 2,241) Hz
-1.5

-0.9

-0.3

0.3

0.9

TVD
0
5
64
9,

Start PRO

11,080
11,100
11,120
11,140
11,160
11,180
11,200
11,220
Depth (ft)

11,240
11,260
11,280
11,300
11,320
11,340
11,360
11,380
11,400
11,420

ducing the next-highest performing offset
by a 2.5 multiple. Likewise, Well C is
exceeding expectations by 14 percent
and outproducing the next-highest performing offset by a 1.7 multiple.
These positive results are proof of a
dramatic increase in the number of effective clusters by successfully applying

PAUL M.
WEDDLE

Paul M. Weddle is well completions
manager for Liberty Resources II LLC,
a Denver-based independent with operations in the Bakken Shale and Powder
River Basin. He graduated in 2005 from
the University of Texas at Austin with a
B.S. in petroleum engineering, and began
his career working for Shell as a completion engineer fracturing tight gas
formations in Wyoming. Since then,
Weddle has completed vertical and horizontal wells in unconventional oil and
gas reservoirs in Utah, North Dakota,
Texas and Oklahoma.

90
91

6 12 18 24
Frequency (Hz)

23
3.
6

23
3.
2

23
2.
8

11,440

Inc (deg)

2 3 4
Ranking

an HDP strategy with XLE. The case
study data demonstrate that XLE diversion
consistently can increase the PCE of an
HDP completion design by maximizing
perforating friction.
Wells A, B and C show a consistent
increase in productivity, reserves and
capital efficiency. Moreover, finding and

LARRY
GRIFFIN

Larry Griffin is vice president of completion and production operations at Liberty Resources II LLC. With more than
35 years of experience, he began his career with ARCO in West Texas and Alaska.
He joined Pinnacle Technologies in 1998
and was instrumental in developing and
commercializing fracture and reservoir
diagnostics technologies such as tiltmeter,
fiber optics and microseismic. Griffin
served as Newfield Exploration Co.'s
completions manager for the Arkoma
and Anadarko basins before joining Liberty Resources in 2011. He holds a B.S.
in petroleum engineering from Texas
Tech University.

Editor's Note: The authors acknowledge
Liberty Oilfield Services, PerfX Wireline,
GEODynamics, Ziebel and ProTechnics
for their roles in the ongoing field trials of
the HDP/XLE completion design, as well
as the early pioneering work in limitedentry perforating documented in SPE
184828 "Mining the Bakken: Driving
Cluster Efficiency Higher using Particulate
Diverters" and SPE 189880 "Mining the
Bakken II: Pushing the Envelope with
Extreme Limited Entry Perforating." The
papers were presented, respectively, at
the 2017 and 2018 Society of Petroleum
Engineers Hydraulic Fracturing Technology Conference.

C. MARK
PEARSON

C. Mark Pearson is chief executive
officer and president of Liberty Resources
II LLC. He is a Society of Petroleum
Engineers' distinguished member with
expertise in well completion and stimulation. Pearson is one of the pioneers of
multistage hydraulic fracturing of horizontal wells, with more than 30 years
of horizontal experience in West Texas,
Alaska, the North Sea, the Mid-Continent,
North Dakota and Wyoming. A former
professor of petroleum engineering at
the Colorado School of Mines, Pearson
holds a B.S. and a Ph.D. from the Camborne School of Mines, and is a graduate
of the Harvard Business School Advanced
Management Program.
SEPTEMBER 2018 51

American Oil and Gas Reporter - September 2018

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