Page 99 - Open-Hole Log Analysis and Formation Evaluation

its
or
Six
The
from
Hole
Type
mud
Hole
figure
use
The
(Note:
special
Each
Choice
Depth,
is
the
question
adequate
operation
borehole.
inches
Size
for
QUESTION
5.13.
limitations,
tool
of a
Maximum
filtrate
CHOOSING
is
tools
5.2
of
for
is
thus
porous
(compensated
this
A
small-diameter
#5.3
the
invasion
Formation-fluid
Economics—rig
are
water-based)
the
(S,,
hole
Pressure,
=
size
most
Whether
tool
logging
this
tools
normal
and
occupy?
time,
of well—wildcat
size
neutron
borehole wall
process
and
are
fails
the
sandstone
or
conditions—depth,
suite
available
holes
is
100%)
illustration of what may be
LOGGING
standard
discouraged.
to
How many linear feet of 3%
designed for a
drillpipe
to
to
logs,
logging
will
Estimate
resistivity
logging
in.
sandstone
from
is
hard
content—fresh
an
majority of logging tools are
depends
be
SUITE
be
relative
.
available
or
to
the
there
the
tools.
provide
on
100
may change
minimum
for
ft
A
before
dollars,
are
salt
Temperature
development
the
the
the
rated at
increases
values
invasion
logged.
readings
it forms a reservoir of mud filtrate
hole
etc.
define.
27.1
of
or
volume
compensated
thick.
well
type
influenced
smaller
For
limited
of
size
connate
Rp
is
by:
deviation from vertical,
required
Most
linear
20,000 psi
of some
diameter
for
logging-service
and
holes.
of mud
water
water
higher
100%
decreases
specific set of conditions.
formation
number
R,.
drillpipe will the volume
or
of 40
resistivity profile
A
used
of
oil
hole size,
correct
logging
expected for a number of cases is
in.
with
that
feet/cubic
pad-contact
density
and
companies.
The
saturated
measurements
will
around
begins
shown
and 350°F. This
calculated
foot.)
logs,
temperatures,
tools
is
slim-line,
safe
and
Outside these
mud type
be
(oil-based
the
schematic
in
distance
and
in
hole

with

Resistivity Increasing ———a>- : be recovered. _ to connate from recovered filtrate in. diameter is 8% It bed A30% #5.2 QUESTION formation fluids are recovered. drillstem test before t. . : that will be recovered ona Oil-Based Mud because tools the important because it affects 5. WIRELINE LOGGING 83 EVALUATION DA

Zone

Invaded

Water
i !
r
FIGURE
bearing:
Formation

5.13
Zone.
Undisturbed
Radial
Content.

Resistivity
Invaded

Profile
as
a
Function
Undisturbed

of Mud
| Zone 1 ! Zone | 1 3 bearing Water I t | I Water Connate Fresh Oil bearing I | Water bearing Water Connate Salty Oil beari aring Water-Based Mud OPERATIONS
t
Type
and

t | |