American Oil and Gas Reporter - January 2016 - 77

acreage in only a small portion of the
basin. Therefore, ideally, DCA should
be performed on a well-by-well basis.
For example, Figure 4 shows how type
curves in the Eagle Ford vary, depending
on reservoir quality (grade A is the sweet
spot of the play, extending to grade J at
the fringe).
Obviously, adopting an A or B grade
type curve for C grade acreage for the
purpose of estimating reserves would
result in a large overstatement of reserves.
Furthermore, flow regime changes over
time require a differentiated decline curve
model with decreasing b-factors for different periods in the lifetime of the well.

Using a full-fit DCA for a well's entire
production history can underestimate
early production, and overestimate
production once production behavior
changes from superhyoperbolic to
hyperbolic. A better method is to determine
where the change from superhyperbolic
to hyperbolic occurs, use a best-efforts
methodology to calculate EUR values
for the later stage decline, and then add
prior cumulative value to the later stage
EUR volumes.
Is Restimulation The Future?
The combination of increased maturity
of shale development, evolved completion

Perforated Intervals
(Box Shows 25th to 75th Percentile)
FIGURE 2A
Midland Basin
14,000

Reference Points
Average
Median

13,000
12,000
11,000

Perforated Interval (ft)

10,000

9,000
8,000
7,000
6,000
5,000
4,000
3,000
2,000
1,000

2011

2012

2013

2014

2015

FIGURE 2B
Delaware Basin
14,000

Reference Points
Average
Median

13,000
12,000
11,000

Perforated Interval (ft)

10,000

9,000
8,000
7,000
6,000
5,000
4,000
3,000
2,000
1,000
0

2007

2008

2009

2010

2011

2012

2013

2014

2015

FIGURE 2C
Bakken Formation
16,000
14,000

Reference Points
Average
Median

Perforated Interval (ft)

12,000
10,000
8,000
6,000
4,000
2,000

2005

2006

2007

2008

2009

2010

2011

2012

2013

2014

2015

JANUARY 2016 77



American Oil and Gas Reporter - January 2016

Table of Contents for the Digital Edition of American Oil and Gas Reporter - January 2016

Contents
American Oil and Gas Reporter - January 2016 - Cover1
American Oil and Gas Reporter - January 2016 - Cover2
American Oil and Gas Reporter - January 2016 - Contents
American Oil and Gas Reporter - January 2016 - 4
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