American Oil and Gas Reporter - PBIOS 2014 Official Program Guide - 185

FIGURE 6
Thermal Recovery for Two-Interval Treatment
60
9,700
9,750
9,800

Temperature (F)
100 110 120

Expected vertical
coverage based
on thermal
recovery results

130

140

150

160

6:31:17 a.m.
During injection
10-min recovery

9,850

30-min recovery
Measured Depth (ft)

val was much faster than for the second interval, indicating that less fluid volume entered the first interval area relative the second interval. When conducting the initial
prefracture design, the model simulator
showed the two perforated intervals overlapping during treatment. This assumption
was used to pressure match the model to
real-time data collected during treatment.
DTS data indicated a hydraulic fracture
height of 60 feet for the first interval and
100 feet for the second interval, while the
post-job fracture model showed 145 feet
for both intervals. The initial post-job fracture model assumed one large fracture.
Consequently, a post-job fracture model
was performed assuming two independent
fractures, as suggested by DTS.
Those results indicated 54 feet of fracture height for the first interval and 80 feet
for the second interval. Assuming two independent fractures, the modeling results
were in better agreement with DTS, but
still varied by 10 and 20 percent, respectively, for the two intervals.
When assuming a single fracture per interval, adjustments were made to the rock
properties uniformly throughout the zone
to match the instantaneous shut-in pressure.
Because this was an incorrect assumption
based on DTS results, further adjustments were made unilaterally to rock

60-min recovery

9,900

6-hr recovery
9,950

12-hr recovery

24-hr recovery
10,000

48-hr recovery

10,050

1
10,100

10,150

Perforation intervals
10,200

properties throughout the perforated interval to match ISIP. Increasing the stress
properties above, between and below the
targeted perforations increased net pressure
and matched the ISIP experienced in real

time. The solution with two unique fractures was used as the final result.
The mapped DTS results were compared with the processed open-hole data.
Figure 7 shows DTS thermal recovery re-

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OCTOBER PBIOS 2014 185

American Oil and Gas Reporter - PBIOS 2014 Official Program Guide

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