Page 79 - Open-Hole Log Analysis and Formation Evaluation

may
may
from
There
FIGURE.
a
be
~+—~—
Despite
Second,
When
involves
obtained
are
indicators
4.1.
part
GUN
all
Halliburton
induce
of
name and the
these
from
the
BODY
of the
local
obvious
depth
Company.
samples
formation
Conventional’
drawbacks,
surface and each core plug
formation
fracturing.
have
sidewall cores,
limitations
from which
that
In
Last,
Sidewall
to
been
properties.
sidewall
has
the
the
ina
It
it was
the
Core
is
trip
first
cores
cut.
analyzed for porosity, permeability,
been
up
collected,
are.
Gun.
amount
place,
normal
the
the
the act of explosively firing the core barrel
still
of
the
gun
hole
flushed with
is
data
Courtesy
Subsequently,
good
to
practice
into the
sample
to
that
the
mud
raised
is
these
to
can
WELEX,
a considerable amount of flushing through the mud column.
be
inspect
formation
surface
taken
quick-look
and hydrocarbon content.
glass jar marked with the well
filtrate.

the
a
cores

is stored
the
the
the
The
and
Each
hole.
these
Core
When
causes
break,.a
cut,
hole
wall
core
available.
the
equipped
presently
no
core
With

cores
of
and
this
with
Plugger
when
the
planned
a
conventional
CONVENTIONAL
a
capable
decision
physical
tool,
is
takes about
at the well
plugger uses
dressed
depth
5
mud
/ Industries, Inc. FIGURE 4.2 Closeup View of Core. Gun. ~—CORE BARRELS ~+— SWITCH SECTION ~+——SP RING kee t 65 4. CORING DATA EVALUATION FORMATION AOU AMID UE GAL TELUING
core
site
sidewall
formation
with
damage
CORING
of cutting
reached
a
size
nonrotating
to
in
core
up
is
minutes
reached,
logging
‘
the
to
a motorized
to
gun
'f1¢
inner
to cut a
12
order
unit
hollow
etc.),
in
cut.
in.
to
or
core
in
sample.
for hydrocarbon
core
barrel
This
as
bit
. Courtesy Dresser
odor,
retrieve
conventional
samples
the.drillpipe
and
consolidated
geologist’s.
its
circular bit to bore
is
a
in
shown
core
diameter.and
in
one
dog
1%
hollow
run
fluorescence,
in.
removed
samples.
figure.
oe
in
house.
‘ Atlas, Dresser
stain,
device works better than
formations.and
physically into
the
long.
barrel
4.3.
is
(ata drilling
from
It is