American Oil and Gas Reporter - September 2021 - 56

Delaware HFTS2 Update
Microseismic Data
Reveals New Insights
About Treatment Sequences
By Bo Howell,
Zhao Li,
Denise Furtado and
Collin Straus
Microseismic data acquired at the Hydraulic
Fracturing Test Site 2 (HFTS2)
in the Delaware Basin suggests that hydraulic
fracturing fluids tend to find the
weakest passages through geologic formations.
The data also indicates relative
well positions and treatment sequence
significantly impact fracture geometry.
The microseismic data was collected
as part of a program aimed at supporting
continued advances in hydraulic fracturing
efficiency, which already have helped
make the Wolfcamp the largest continuous
oil and gas formation in the United States.
The data was acquired during the completions
of three Wolfcamp wells-the
Boxwood 1H, 2H and 4H-that were stimulated
sequentially.
When the Boxwood 1H was stimulated,
its toe stages quickly reacted to the deFIGURE
1
Well Geometrics and Locations
HFTS2 - Microseismic Fracturing
Well Locations
pleted Bitterroot section to the east of
the Boxwood pad, extending microseismic
events more than 3,000 feet eastward.
This behavior changed dramatically after
the treatment passed the Bitterroot section
at the toe; the heel stages showed tight
microseismic grouping around the stimulated
well, a sign treatment was breaking
up virgin reservoir rock.
The Boxwood 2H demonstrated a similar
pattern of behavior between its toe
and heel stages, suggesting the depleted
Bitterroot remained easier to refracture
than adjacent nondepleted rock.
However, microseismic activity differed
for the Boxwood 4H treatment. The events
generated during the 4H's stimulation were
hardly influenced by the depleted Bitterroot
and filled the space between the previously
stimulated 1H and 2H wells.
These observations come from advanced
microseismic monitoring techniques,
including:
· Native synchronization of five monitor
arrays;
· Real-time location of microseismic
events;
· Joint event-hypocenter/velocity-model
inversion that locates microseismic events
while simultaneously constructing azimuthally
anisotropic velocity models; and
· High-resolution reservoir imaging,
utilizing microseismic events as downhole
sources.
Acquisition Geometry
To ensure microseismic interpretation
would remain consistent across the three
wells, a geometry with five static monitoring
arrays was established to acquire
and process the data. Beginning in
March 2019, three individual completions
of one-mile laterals drilled in the
Wolfcamp and Wolfcamp B were monitored
with this arrangement. The arrays
were static throughout the entire operation,
except for a redeployment at 2H
stage 5 landing at the same position in
the Boxwood 55-1-12 Unit 5PH. All
arrays were sampled at a rate of one
56 THE AMERICAN OIL & GAS REPORTER

American Oil and Gas Reporter - September 2021

Table of Contents for the Digital Edition of American Oil and Gas Reporter - September 2021

Contents
American Oil and Gas Reporter - September 2021 - Intro
American Oil and Gas Reporter - September 2021 - Cover1
American Oil and Gas Reporter - September 2021 - Cover2
American Oil and Gas Reporter - September 2021 - Contents
American Oil and Gas Reporter - September 2021 - 4
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American Oil and Gas Reporter - September 2021 - Cover3
American Oil and Gas Reporter - September 2021 - Cover4
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