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Big Whammy Prospect
GENERAL
GEOLOGY
AUSTIN CHALK, PEARSALL FIELD
ELLSWORTH #1 EWALD
FRIO & LASALLE COUNTIES, TEXAS
132.01 ACRES (75% NRI LEASE)
DRAINHOLE LENGTH: 2145’
PRIMARY PRODUCING ZONE:
AUSTIN CHALK FORMATION B-1/B-2 ZONES
PROPOSED METHOD OF LIFT: BEAM PUMP
Pearsall Field, a large
field in South Texas, covers portions of Frio, LaSalle, Dimmit,
and Zavala counties. It produces primarily from the Upper Cretaceous
Austin Chalk Formation. With the first production established
in 1936, the field has a cumulative production of 137,609,258
BO and 89 BCF to date. The rock is typically a dense impervious,
micritic limestone in which production is dependent on secondary
porosity and permeability created by fractures. The field is located
downthrown to the Balcones Fault Zone, and is not influenced by
major faulting like other Austin Chalk Fields, such as Giddings
Field. The structure in Pearsall Field is a regional anticline
trending northeast-southwest with very little closure. Therefore
production is not due to structural entrapment within the anticline,
but is related to fracturing within the Austin Chalk due to the
upward arching in the anticline.
The fractures are predominately
vertical and occur in an en echelon pattern trending generally
northeast-southwest, or parallel to the axis of the anticline.
Therefore, it is easy to envision how a horizontal drainhole can
enhance production from this reservoir, thereby intersecting many
fractures by drilling perpendicular to strike.
The Ellsworth #1 Ewald
is a 2145’ horizontal well drilled by Ellsworth in 1989.
The well was completed with an initial potential of 654 BOPD,
275 MCFD, 220 BW, 380# FTP on a 48/64” choke. The cumulative
production through 1998 was 222,061 BO and 151,940 MCF and 310,141
BW. The enclosed cross section illustrates the traverse of the
lateral drainhole with the major show intervals marked. The well
was basically a traverse through the B-1 and B-2 sections, which
is considered the known pay zones in the area. The #1 Ewald Well
is a good candidate for the acid frac treatment in that 2145’
of the drainhole is concentrated in good fractured rock.
The current drainhole
is concentrated in the B-1 and B-2 zones with most of the well
in the B-2 zone; only 490’ of the well is concentrated in
the B-1. There is excellent history of B-1 production in the area
as well as good mud log shows in the existing well in the B-1
zone.
The HPE #1 Ewald lease
is situated where offset drainage is negligible. To the east the
acreage had title problems and was not drilled. To the southwest
the acreage is Mobile fee acreage, and they have chosen not to
drill or lease the acreage. Therefore future oil recovery from
this lease should be excellent as well as future drilling potential.
The pumping history
of the HPE #1 Ewald is as follows;
1.) In 1990 the well
was put on submersible pump (operated by Ellsworth).
2.) In 1991 the well was put on 456 Darco beam pump (operated
by Ellsworth).
3.) In March 1996 the well was put back on submersible pump (operated
by Express Oil & Gas). The well was pulled too hard and the
fluid level dropped below the submersible pump and it burned up.
In 1998 the submersible pump and tubing were pulled from the well
and it has been S/I ever since.
It is our opinion that
massive quantities of fluid were pulled from this wellbore (on
submersible pump twice) and that a limestone drilling fines accumulation
has built up in the drainhole. This well has never been cleaned
out or stimulated with acid. Our objective is to clean out the
drainhole and perform a 60,000 gallon 15% HCL acid frac on this
well. Ellsworth has applied the “acid frac” on two
(2) wells in this immediate area with fantastic results. The HPE
#1 Carroll and the HPE #1 Walls wells were treated with the 60,000
gallon 15% HCL acid and diverter fracs (see Exhibits attached
with BJ Acid Frac Procedure).
The wells exhibited a dramatic increase in production, in their
first month of production (post frac), in excess of 600 BOPD,
and up to six months of flush production. For the entire year
of 1996 when Express Oil & Gas put a submersible pump on the
#1 Ewald well it averaged 64 BOPD and 66 BWPD; keep in mind that
this production was from a plugged up drainhole, absent of acid
frac stimulation. A fluid level on the HPE #1 Ewald was taken
on approximately 5/19/2005 and fluid was tagged @ 1994’.
There is currently no market for casinghead gas that will be produced
from this well. The HPE #1 Ewald will qualify for a severance
tax exemption (4.6% on oil) because the well has been inactive
for over two (2) years.
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