Page 92 - Open-Hole Log Analysis and Formation Evaluation

it
be
(c)
the
the
is
not
figs.
It
two
THE
bed.
wall.
itself.
depth
is
As the
within
ments
be
appear
begins.
section

involved
different
5.10
pressure,
literature
more
The
as
reference.
the
Another
important,
Fishing
Because
in
porous
a
Figure
have
for
and
sensors).
Since
control
. a _ Fish Cable Shot Over-— Door Side I. METHODS OF 78
the
the
to
simultaneously
and
points
terms
5.12
pore
Thus,
on-depth
the
off depth
on different trips
depth
important
BOREHOLE
the
is to
sensors,
“remembered”
depth
Note
are
be
5.11).
to
fluid from
the
with
Each subsequent
used
In
sensor producing
therefore,
along
(e.g.,
space
that
with Drillpipe.
in
various
multiple
to
the
evaluation
the
Band C.
problem
signal
each
— b
pressure
until the
i run before the main logging on-depth using this repeat log should be placed a good marker insist ona repeat section that passes The other. thése surveys may Unless care is taken, when several surveys are recorded arises on the log. recorded certain that all curves make by 1 can only be logged each of 2 appears at different depths for the formation
and
permeable)
Sand
FIGURE 5.9 Fishing Alternatives.
figure
reference
Sand
on-depth
table
into the hole.
in
zones
the
distinguish
memorized

and
of well
5.1
the mud will
the
ENVIRONMENT
that
the
drill bit penetrates a permeable
logs.
move
mud
deposit
should
between
a
tool,
marked A.
resistivity
The
only

sensor
into
be

of
surround
the
their
formation,
well
column
on
the
the
Higher
flushed
highest
a
method
an
mudcake
illustrates the process and the names
up
on
known
resistivity
on
exceeds
the formation
the
respective
the
to
of
borehole.
is
rock/fluid
(invaded)
common
the

of assuring
tool
Sensor A.
tool
It
zone
made.
is
system
the reference point for the survey is
are
fluid
everyone
used in logging
must
(provided
borehole
formation
is
invasion process

good

| to. measurement of measurement Memory Distance [==] 5. WIRELINE 79

to
of
FIGURE
:
TD-+to
<_<"
reading
5.10
Memory
Distance
first
measurement
measurement
Distance
C
A
from—>|
B
A
“se

Measure Points
U
[><]
=<]
~ head connects Logging other plus. some Dual Laterolog used for covered bridle <— Rubber Ibs 800-22000 Breaking Strength = 3/8” ~ 1/2” Diameter conductors. with 7 electrical logging cable Steel stranded *— OPERATIONS LOGGING

and
in
to
1”
This
-
bridle
14000
100
Measure
Portion
Measure
Measure
to
grappling
of
ft.
resistivity
Ibs.
2-3/8”
top
smaller
diameter.
Point
Point
of
point
head
and
Point“B”
“C”
is.
“A”
Memorization
for
devices.
portion
Length
about
Breaking
smailer
Distanc
varies
instruments.
6
provides
cable
overshots.
a
12” Jong.
or
strength
from
Usually3/4”
-
Upper
diameter
is
20
1”

feet