American Oil and Gas Reporter - PBIOS 2014 Official Program Guide - 186

Permian Basin Reports
FIGURE 7

near areas with low relative brittleness.
The upward and downward growth was
more challenging to quantify using only
DTS thermal recovery results. Of all the
slickwater stages monitored, this stage provided the most ambiguity in quantifying
fracture height growth. However, even with
such challenging data, there was still
confidence in the final results.

DTS and Logging Data for Two-Interval Treatment

60
9,700

70

80

90

Temperature (F)
100 110 120 130

140

150

160

9,750

9,800

Measured Depth (ft)

9,850

9,900

9,950

2

10,000

10,050

1
10,100

10,150

10,200

sults (left) and open-hole data (right). The
focus areas again were at the upper and
lower bounds of fracture heights to identify variability in the logging results. It is
very possible the downward growth from
the deepest perforation was impacted by
the previous fracture stage, in which fracture height had reached 10,250 feet MD
a few hours before.
There was no clear change in the logging data at the upper bound of the first

perforation interval. It was unclear if
anything reservoir-related impacted upper
vertical fracture growth at this depth.
The shallower second target perforation
area showed changes in the logging results
of upward and downward vertical fracture
growths. The downward growth appeared
to stop at the interface between the Cline
and Wolfcamp formations, with all of the
hydraulic coverage in the Wolfcamp. The
upward growth appeared to terminate

FIGURE 8A

FIGURE 8B

Original Fracture Height
(DTS versus Initial Post-Fracture Model)

Modified Fracture Height
(DTS versus Final Post-Fracture Model)
300

250

Stage A
Stage B

200

Stage C
Stage D

150

Stage E
Stage F
Stage G

100

Stage H

Initial model results
for Stage D

50

Stage I

Fracture Height from DTS (ft)

300

Fracture Height from DTS (ft)

Total Reservoir Coverage
A primary goal of constraining the fracture models was to better understand total reservoir coverage. Based on comparing DTS responses with initial post-job
fracture modeling, it was determined that
only one stage required remodeling and
constraining to DTS fracture height estimates. Figure 8A illustrates fracture height
results for each stage as mapped by DTS
and initial post-fracture modeling. The
scale on each axis is the same, so the closer the symbol for each stage is to the dotted line, the more agreement exists between the two fracture height measurements. There is clear consistency, but with
the modeling results showing both marginal overestimation of total height growth
and some underestimation, compared
with the DTS results.
Figure 8B is the same chart, except that
it illustrates the corrected fracture height
comparison. Only Stage D was modified
after the initial post-job fracture model to
better mimic the DTS results for two separate fractures.
The total vertical formation range investigated was 3,100 feet, with various pay

250

Stage A
Stage B

200

Stage C
Stage D

150

Stage E
Stage F
Stage G

100

Stage H

Remodeled Stage D
based on DTS results

50

Stage I

Stage J

Stage J

Stage K

Stage K

-

-
-

50

100
150
200
250
Initial Post-Job Fracture Model Height (ft)

186 THE AMERICAN OIL & GAS REPORTER

300

-

50

100
150
200
250
Initial Post-Job Fracture Model Height (ft)

300



American Oil and Gas Reporter - PBIOS 2014 Official Program Guide

Table of Contents for the Digital Edition of American Oil and Gas Reporter - PBIOS 2014 Official Program Guide

Contents
American Oil and Gas Reporter - PBIOS 2014 Official Program Guide - Cover1
American Oil and Gas Reporter - PBIOS 2014 Official Program Guide - Cover2
American Oil and Gas Reporter - PBIOS 2014 Official Program Guide - 3
American Oil and Gas Reporter - PBIOS 2014 Official Program Guide - Contents
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American Oil and Gas Reporter - PBIOS 2014 Official Program Guide - 18A
American Oil and Gas Reporter - PBIOS 2014 Official Program Guide - 18B
American Oil and Gas Reporter - PBIOS 2014 Official Program Guide - 18C
American Oil and Gas Reporter - PBIOS 2014 Official Program Guide - 18F
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American Oil and Gas Reporter - PBIOS 2014 Official Program Guide - Cover3
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