American Oil and Gas Reporter - April 2022 - 53

several wells during drilling. Open-hole
log data-including gamma ray, spectral
gamma ray (SGR), propagation resistivity,
formation density and compensated neutron-was
acquired and processed for
petrophysical and geomechanical property
identification along the laterals.
After fracturing during frac plugs removal
with jointed pipe, LWT deployment
of SGR, formation density, and
neutron logs where repeated inside the
27
⁄8-inch tubing. Tools were effectively
deployed down the wellbore inside the
workover string and pumped to the bottom
of the tubing for two of the wells.
Logging data was obtained to memory
while tripping out of the well with a
plug removal bit assembly.
The cement density data was evaluated,
and the mandrel density readings were supplemented
with an ultrasonic imager tool.
Before and after fracturing neutron count
rates were compared and areas of higher
fluid in the NWR related to the fracturing
process were observed (Figure 1B).
Planned perforation depths were provided
and plotted on the fracturing water
saturation curve. A six-foot area surrounding
each cluster location was selected
to represent the fluid associated and received
by each cluster. The amount of
FIGURE 2
Perforation Cluster Efficiency (DAS versus LWT)
40.0%
35.0%
30.0%
H2
= 0.6873
25.0%
20.0%
15.0%
10.0%
5.0%
0.0%
0.0%
5.0%
10.0%
15.0%
20.0%
fluid shown at each cluster, as represented
by the area under the curve for the perf
location and approximately six feet away,
then was divided by the total area under
the derived curve for that stage. Using
this approach, a PCE was determined for
each cluster location.
PCE was monitored with a permanent
PCE
DAS
25.0%
30.0%
35.0%
40.0%
45.0%
50.0%
fiber optic installation in the Niobrara
well. Interpreted DAS information was
used to allocate frac fluid distribution
throughout the individual fracturing treatments.
With fiber optic sensors employed
in this well, a variable completion and
perforation strategy was studied. As shown
in Figure 2, a positive statistical agreement
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APRIL 2022 53
PCE
CEL
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American Oil and Gas Reporter - April 2022

Table of Contents for the Digital Edition of American Oil and Gas Reporter - April 2022

Contents
American Oil and Gas Reporter - April 2022 - Intro
American Oil and Gas Reporter - April 2022 - Cover1
American Oil and Gas Reporter - April 2022 - Cover2
American Oil and Gas Reporter - April 2022 - Contents
American Oil and Gas Reporter - April 2022 - 4
American Oil and Gas Reporter - April 2022 - 5
American Oil and Gas Reporter - April 2022 - 6
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American Oil and Gas Reporter - April 2022 - Cover3
American Oil and Gas Reporter - April 2022 - Cover4
https://www.nxtbook.com/nxtbooks/aogr/202205
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https://www.nxtbook.com/nxtbooks/aogr/202201
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https://www.nxtbook.com/nxtbooks/aogr/2012_pbios
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https://www.nxtbook.com/nxtbooks/demo/aogr_clone
https://www.nxtbook.com/nxtbooks/aogr/201112
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