American Oil and Gas Reporter - PBIOS 2014 Official Program Guide - 143

were situated on a structural basis in this
area (Figure 3). Most of these were not
drilled intentionally for the W-A, but for
deeper conventional pay such as the Ellenberger, Devonian and Strawn.
As those deeper, conventional reservoirs
played out, operators would plug back,
coming up hole to perforate and produce
zones that had hydrocarbon shows, but
that were considered secondary in quality.
The cost of a recompletion is minimal,
compared with the original drilling and
completion. A recompletion in the Wichita-Albany/Fullerton may cost $300,000$400,000 and yield 36,000 barrels of oil.
Most W-A production has been behind
pipe for a number of years, waiting to be
produced when lower zones played out.
In Apache's area of W-A activity, recoveries from recompleted vertical wells
have averaged 30,000-40,000 barrels.
Geologic structures, particularly fault
traps, have played a big role in identifying
the "sweet spots" of the WichitaAlbany/Fullerton. The Ellenberger top
structure map shows major and minor
faults that come up from the basement
rock. Current horizontal drilling activity
centers in a corner of a triangular intersection of faults and shear zones in the
southwest corner of Andrews County,
Tx.
A little higher in the section, the structure is on the Woodford Base, beneath
the Wichita-Albany/Fullerton in western
Andrews County. The faults have controlled some of the established drilling
in the area, forming fault traps in these
conventional reservoirs.
Most of the faults have not penetrated
into the W-A, but they still control the
structure. This is an important consideration that separates these former subcommercial plays from unconventionals.
Structure is much less of a component in
unconventionals, whereas it still is something to be considered in these poor
quality, subcommercial formations.
Early Results
Logs from the W-A area show that
there does not seem to be much in the
way of pay, either conventional or unconventional. There appears to be a relatively shaly, limey section in the upper
portion, but it is nothing like what one
would see in the Wolfcamp or Woodford
shales. It is perhaps 100-150 feet thick,
which ordinarily would not be enough
shale.
Similarly, even though there are small
stringers of conventional reservoir interbedded throughout the shale, there are
not enough of these to make a commercial
vertical well.

Horizontal drilling in the Wichita-Albany/Fullerton has all been within the
last three years. Apache has been the
leader in this play, reporting one well
with initial production of more than 1,000
barrels of oil equivalent a day. The first
five Three Bar wells reported in Andrews
County had an average IP of 680 boe/d,
with the Three Bar TBSU No. 105H
coming in at 1,008 boe/d on March 10.
Lateral lengths range from 4,650 to 7,467
feet in the five wells.
Hydraulic fracturing played an important role in developing these wells.
Depending on the length of the lateral,

12-18 fracture stages were used. To the
north, laterals are about 5,000 feet, while
to the south, they are 7,000-8,000 feet.
Spacing is 250-300 feet.
All wells are designed as horizontals
targeting hybrid plays. Several additional
wells are planned. Well spacing is pretty
tight, at eight wells per section in some
places. Farther north, the spacing is more
conventional, running at four to five wells
a section, or between 100 and 160 acres
per well.
Apache clearly is chasing the Wichita-Albany/Fullerton horizontal format. It
is drilling the wells for less than $6

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OCTOBER PBIOS 2014 143



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
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American Oil and Gas Reporter - PBIOS 2014 Official Program Guide - Cover3
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