Page 77 - Open-Hole Log Analysis and Formation Evaluation

62

I.
40
FIGURE
Courtesy
3.7
METHODS
TELECO
Teleco
OF
MWD
(counVunit
Comparison
time)
GAMMA
GATHERING
210;

between
wo
Oilfield Services Inc.
m
a
m
—
=
=
3
g
XX50
XxX00
XX75
XX25
MWD
—
FORMATION
———
and
(API
Wireline
WIRELINE
EVALUATION
Units)
Gamma
GAMMA
DATA
.
Ray

Logs.

be
are
AA:
and
The
that
The
was
new
tion,
core
with
break
alter
fluids
view of
at
aimed
is
already
the
hard to
relation
the
strength
number
attached
the
Figure 4.1
in
a
diameter
provides
samples.
at
and then
core
and
placed
Sidewall
formation
both
length
of
of
WIRELINE
CHAPTER
run.
its
capable
currently in
gun
device,
at
Occasionally,
a
meet
core
OBJECTIVES
the
Two methods
is
the
of
objectives
of the
bullet
reservoir
the
These
to'the
the
covered sample;
use:
Cores
of the
the
analyzed.
pore fluids to the
hardness
FOUR
pores.
restoring
gun.
hollow
analysis.
sufficient
transport
since
short
These guns come
by means
bullet
can
CORING
the
will
core
of
it
CORING
core
core
the
the
be
to
bullet.
be
steel
the
correct
will
a
retrieving
properties
retainer
it may be
Anumber of techniques
tension
barrel
be
section
very
conditions,
These will
as
60
equipped with
plugger.
on
depth
original
be
act
bullets
of
wires
retrieved
lost
of the
an
Raising
of explosive
in
retrieved
conventional
discussed
is
SP
may be
in
formation
SP
may be
laboratory
a
that
state
long as 2
the
in
of the explosive charge used,
the
of retrieving formation
by
used
rock
samples
the
log
for
to
illustrates a sidewall core gun.
can
the wires
in.
the
in a variety of shapes
in
charges.
this
of cutting
discussed
gun
well
of the
to
a
sidewall
be
in
brought
hole.
means
with
in
type
anywhere
electrode.
one
itself and
Once
analysis.
prior
retrieve
core
of
core
fired
into
the
chapter.
trip
This
determine the
to
and sizes.
the
of coring are to bringa sample ofthe
other
the
Figure
dislodge
chapter
will,
formation
gun
in
function_of many
On
These
between
lodged
to
4.2
the
play at
26,
flexible
Other
core
the
34
allows
in
is
length
and a
ofcore barrel
a
samples with wireline
the
selectively
borehole
sampling
of
the
the
and
some
saturation
steel
formation
which
open-hole
bullet.
hole.
barrel
average,
variables.
by
into
the
or as short as nothing at
time
objectives
tool
sample when
closeup
The
re-
selected,
will
The
1% in.
all.
they
logs
cor-
the
wires
forma-
to
Note
usually
relatively
tools are
The body ofthe gun carries a
it
the
techniques,
are
exist for minimizing damage to formation
|
extent,
of the
surface in an unaltered state, to preserve the sample,
deals
and its: