American Oil and Gas Reporter - PBIOS 2014 Official Program Guide - 164

Permian Basin Reports
ured with slickline-conveyed memory
gauges and averaged 4,100 psi, compared with the typical average reservoir
pressure of 3,000 psi. Pattern 261-2 was
one of the first to receive CO2 injection.
After being on injection for a few months,
a production response was noted in the
eastern-most producer in this pattern.
However, the pattern recovery as a whole
was disappointing and it appeared the pattern was going to have to be put on chase
water injection after a dimensionless oil recovery of only 2.5 percent.
In retrospect, this was not surprising.

The initial BHP in the western-most producer was actually higher than the BHP in
the injection well, making it impossible for
CO2 to process the entire western half of
the pattern. This was reflected in the
streamlines for the pattern. Ultimately,
however, after the initial peak oil production rate was achieved and pattern production had begun to decline, it unexpectedly began to rise again to 450 bbl/d-more
than double the initial peak rate. The reason was that the large ESPs (all of the ESPs
in this area were sized for 6,000 bbl/d of

FIGURE 4
Data from Downhole Gauge Package
2,400

260
Intake Pressure
Motor Temp

2,300

240

2,200

220

2,100

200

2,000

180

1,900

160

1,800

140

1,700

120

1,600

100

1,500

80

1,400
11/21/07

11/28/07

12/5/07

12/12/07

12/19/07

12/26/07

1/2/08

1/9/08

1/16/08

1/23/08

60
1/30/08

FIGURE 5
Map of Injector 212-2 and Direct Channel to Producer 271-3A

164 THE AMERICAN OIL & GAS REPORTER

Temperature (F) & Motor Amps

Pump Intake Pressure (psia)

Amps

total fluid) had begun to draw down the
pressure in the other three producers, allowing the CO2 to begin processing the
west half of the pattern.
Figure 4 shows data from the downhole
gauge package. Note the initial decline in
PIP as the initial water curtain was drawn
down, altering the distribution of
injector/producer streamlines. Figure 3
shows the change in streamlines after
two months of injection/production (no
flow to the west because of elevated
reservoir pressure) versus nine months of
injection/production (western half of the
pattern being flooded) The figure also
shows a large unswept area in the southern portion of pattern 289-2, located three
patterns to the southeast.
We were able to see this effect because
the prior water curtain injection had displaced nearly all of the free gas saturation,
and the resulting low system compressibility allowed a rapid drawdown of reservoir
pressure near each of the producing wells.
The high processing rate of this area
(greater than 50 percent pore volume per
year) allowed the response to be observed in a relatively short time frame.
To extend this "second wind" response
when the ESP in the eastern-most producer failed, it was replaced with a much
smaller pump with a much lower withdrawal rate. This increased PIP at this location and enhanced the processing of the
western half of the pattern.
High-Permeability Channel
In another area that also has a high processing rate, a high-permeability channel
had been identified between injector
212-2 and producing well 271-3A. The
red arrow in Figure 5 shows the direct
channel between the wells. This was a
very strong connection and the injector
was shut in to await a large-volume
polymer treatment.
However, there was a six-month delay
in scheduling the polymer treatment, and
during the time that injector 212-2 was shut
in, the producing well began responding
strongly to injection from adjacent pattern
271-3A (the blue arrows in Figure 5 show
sweep from the east and west injectors).
The direct channel from 212-2 had overrun the 271-3A producing well, and when
212-2 was shut in, the channel was drawn



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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