Page 26 - Open-Hole Log Analysis and Formation Evaluation

-_
the
test
can
taw
-time
only
All
made
every
other
reader
almost
overall
Correct
carbons
logging
the
sidered
capacity
induced
wireline
porosity,
of
too
analyzed
in
fluid
becoming
formation
choice
(DST)
open-hole
Wireline
in
Open-hole
record
evaluation.
immensely
well
so
logging and
in
can
instruments.
OPEN-HOLE
to
just
logs
a
not
of the
water
often,
log
logs,
as
taking
formation
fit
Formation testing
the
many
formation
formation and will
impossible
formation
samples
detail
training on the part
measurements
logging
only
drilled
the
oe
properties
the
is
logs
to
or
formation
isolation.
evaluation
radioactivity,
formation
interpretation
but
with
flow
is
can
reservoir
It
LOGGING
are
analysis.
for
overall
accurate
of the
are
ona drillstem test,
but
saturation,
continuous
also
vital
is
measurement-versus-depth
drilled
obtain
Unfortunately,
formation
and
evaluation
broader
provides
testers
then
provides
and
evaluation.
seen
picture
= TESTING Testing ~ | Formation Testing Core Samplin; VSP not as complete as of logging and casing points. Although Logs matters for formation . Openhole the immediate knowledge of is critical and where an path control wellbore offshore wells where valuable in deviated -.atg particularly
and
relation
electrical
its
hydrogen
as
the
be
the
from
record
to
view
record.
and
a
hoped
formation
an
-
rock
measurements
detailed
proof
of
analyst or a
usable
no amount
incorrectly
Figure
of
logs
the
of
ability
great
in
the
methods.
hydrocarbons
DST
end
properties.
ability to sample many different horizons
decision
that
content,
that
to
type.
1.1
log
so
of pressure records
resistivity,
in
In
complement
a
is
log
other
is the proof of the pudding.
of special
and
this
interpreted
obtained
formation
evaluation
Only
analyzed
can deny that a productive zone has been found.
alone.
bulk
from
central
to
making
meeting
formation
by
drill
produce
analysis
in the well
attempts
measurement
task.
acquired
on
elastic
analysis
book
logged
in
in
role
drillstem
give
particular,
to
methods
themselves
place
MWD
pressure
hydrocarbons
a
because
density,
through
are
collars
of
the
However,
the
will
such
Almost without
drillstem
of
with
of
versus
tests
of
and
are
data
properties
a
not
exist
all
that
modulae.
long
by
tests
are
wireline
assist
in
natural
illustrate
procedures.
of
that
depth
context
lack
such
Ifthe well flows hydro-
as
of logging data or core analysis
house
adds
a drillstem
rapidly
also supplies vital data regarding both the
term.
the
continuous
These
as
be
are
the
formation
the
lack of understanding of where
con-
their
the
open-hole
logs
and produce not
always
wireline
and
exception,
of
of
open-hole:

Seismic
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in
in
for
for
the
the
a
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In
takes
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tions.
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client.
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The
FIGURE
optical
survey,
turn,
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hole
1.1
a
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basic
common
The
recording
recording
MODERN
discussed.
conditions
sonde
it
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place
terms
logging
by
may
example,
Drillstem

Formation
general,
a
on
to
cable
Laterolog
Induction
the
camera
be
and
than
formation
logging
open-hole
logging
confusion
as
signals
transmissions
|
elements
well
Fluid
survey

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together
which
activates
not,
up
tool,
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apparatus.
LOGGING
the
their
provide
components
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from
in
signals
tools,
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by
logging
of all
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with
the
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and
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log

Interrelationships
composed
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for
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an
logging
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a
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its
turn
are presented several
Content
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of any
logs
portion
TOOLS
tape).
multiconductor

tools
the
provided
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these
logas
will
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to
itself
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copy
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record
of the
invaded
be
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logging
are

cable.
activates
or

the survey,
well
use
the
terms
of multiple
and
Finally,
associated
Indicators
a
Wireline
interrelationship.
as
mud
of the
recorder.
zone
the
a
The
several
tape
the
depth-measuring
today
As
system.
discussing
Formation
some

when

control
A
involves as much the
sensors.
presented.
inthe
are:
curve.
deck
distinguishes
different curves. The
the

sensor
recording
column,
recorded
form
surface
tool
device,
electronics,
is
different
by
logging-service
by
conditioned
panel,
a
is
Figure
of
Figure
sensor,
logging
There
cable
data.

downhole
the
logs
logging
is
1.3
1.2
device,
is
between
(making
on
which
a
sheave
a
surrounding
on the end
Wireline
tools
separated
company
in
mudcake,
controlling
tools,
matters

raised
Evaluation Methods.
either
pans
suspended
each
for
turn
reproduction
wheel,
and,
from
in
electronics
forma-
the
a
frequently
are
and
used,
illustrates
of the
logger may employ several
incorporated
digital
or
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illustrates

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of