Page 98 - Open-Hole Log Analysis and Formation Evaluation

its
or
Six
The
Type
from
Hole
Hole
figure
use
The
(Note:
special
Each
Choice
Depth,
is
the
adequate
question
operation
borehole.
inches
for
Size
QUESTION
5.13.
limitations,
of a
tool
Maximum
CHOOSING
tools
is
5.2
of
for
thus
is
porous
(compensated
this
A
small-diameter
#5.3
the
invasion
Formation-fluid
Economics—rig
water-based)
are
(S,,
the
hole
Pressure,
=
most
size
Whether
tool
this
logging
tools
normal
and
occupy?
time,
of well—wildcat
size
borehole wall
neutron
process
and
are
fails
the
sandstone
or
conditions—depth,
suite
holes
is
available
LOGGING
100%)
illustration of what may be
standard
discouraged.
to
How many linear feet of 3%
designed for a
to
drillpipe
to
logs,
logging
will
Estimate
resistivity
in.
logging
sandstone
from
is
an
content—fresh
hard
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
salt
are
dollars,
Temperature
development
the
the
rated at
the
increases
values
logged.
readings
it forms a reservoir of mud filtrate
hole
etc.
define.
27.1
or
of
compensated
volume
thick.
well
type
influenced
smaller
For
limited
connate
size
of
Rp
is
by:
deviation from vertical,
required
Most
linear
diameter
20,000 psi
of some
for
logging-service
and
holes.
of mud
water
water
higher
decreases
specific set of conditions.
100%
formation
number
R,.
or
drillpipe will the volume
of 40
resistivity profile
A
used
of
hole size,
oil
logging
correct
expected for a number of cases is
: be recovered. _ to connate from recovered filtrate in. diameter is 8% in. invasion filtrate mud It bed A30% #5.2 QUESTION formation fluids are recovered. drillstem test before t. . : that will be recovered ona because tools the important because it affects EVALUATION DATA I. METHODS OF GATHERING FORMATION
with
that
feet/cubic
pad-contact
density
companies.
The
and
saturated
measurements
around
will
shown
begins
and 350°F. This
calculated
foot.)
logs,
safe
temperatures,
slim-line,
is
tools
Outside these
in
be
distance
and
(oil-based
schematic
the
mud type

and
with
in
hole

Resistivity Increasing ———a>- Oil-Based Mud 5. WIRELINE LOGGING 83

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 | |