Page 90 - Open-Hole Log Analysis and Formation Evaluation

to
and
cuts
than
If
mud
3500
be
point
point.
(6000
it
before
the
"If the
the
(14,000
the tool
is
+
Ib
tensions
On
At
preferred.
in
weakpoint
to
WEAKPOINT
the
is
further
aggravating
the
the
through
column,
cable
a
in
3500)
the
preferred.
greater
tool
cable
the
at
weakpoint will be
of only
18,000
involved.
of maximum
other
the
When
that
the
stretch
Ib)
weakpoint
Of the
3500
is
the
of
proves
depths,
————m>1'_
since
But which will
hole,
of
Ib
tension
weakpoint-is
differential
formation pressure,
mudcake.
free
it
is
formation pressure while the
the
at
surface
other
(T-W)
the
be
stuck,
or
breaks?
=
in
6000
the
this will
One
two,
cable
hydrostatic
Ib,
from
stuck,
cable
pressure
PULL,
top
surface
be
order
pulling
Figure
the
side
preferred.
other side
the cable is
cable
ON
is
the hole but saving the cable),
and
to
is
on
of
as
of
5.7
itself.
length
Differential pressure sticking of the cable
sheave.
itself must
sticking
pressure
tension
the
is
the
free
will
apply
10,000
is
over the tension
breaking
knowledge
necessaty
Thus,
ft
WEAKPOINT
of free
determined
result
cable
of the
Of the
to
6000
help
exposed to
for
stuck
of
-
of the
is
required
Ib
cable.is
to
will
the
to
at
three,
cable.
resulting friction stops any further cable movement
of cable
apply
less
deep
1000
significantly
occur first? Will the cable part at the

have
higher
the
the
caused when the
counterproductive
(fig.
break
explain
than
exposed
9500
=.
problem
will
one
holes
weakpoint
first
5.8).
cable
higher
even higher and may exceed the breaking strength
weak-
forced against the formation,
hydrostatic
to
is
surface
the
Ib
the
a
weighing
is
by
the
or the cable will break at the
extra
three results. The tool will pop free, the weakpoint will break (leaving
apply
of
ra the mérely compound tension any to it to If the hole. and/or up be cable depth, the present logging are the cable length hand, if the free. is evideritly stuck and the cable then the tool is present logging depth, the proves to be so length ficient. If the stretch coef- friction of the chart from mated esti- cable can be the this
.
.
.
to
has
the
the
Use
with
Leave
There
Break
Figure
typical
handle
various
logging
the
the
Logging
pressure
force
400°F.
the
withstand
5.9
LOGGING
and
electronics.
obvious
transmitting
combination
tools
head.
The
be
the
logging
cable
the
are
tool
drillpipe,
These
TOOLS
physical
logging tool
power.
| cable: several alternatives Fishing Alternatives will is coefficient of friction on in., of the cable is % there is 2250 psi; 5000 ft, the hydrostatic illustrate example will Differential Pressure Sticking LOGGING OPERATIONS
2100
illustrates
is
the weakpoint;
and-thread technique
internal
cut-and-thread
Although
Ib.
limitations;
sensors
tubes
attached
3%
or push
abuse.
cable will
these
strings.
to
built to withstand pressures
in.
for
conductors
cylindrical
can
it
can
is
there
be
recover
sensors
in
up
By
to
be
the
be
three
0.1,
are
thus
the
this
technique.
the
the
and
Modern
tool
21,000
is the surest way
example,
cable;
not recommended at depths greater than
and
to
available
to 20,000
cable
tools
attached
pull
methods.
bottom
very
connected
appropriate
psi
to
in diameter and
for
and
is
are
run a
3000
have
10
differential
The
electronics
long
: the the in. tb (350 psi X 120 and only 10 ft of the cable is stuck, psi. a pressure Mud phenomenon: Cable. of the
the
ft.
fish
large variations
of the
recover a
2600
are
required
in
for
mixing
together.
tools
tubes containing sensors
to
hole
psi,
limited
size
recovering
the
pressure
logging
side-door
are
and
side-door
This
a
but
and
modularized
to 30 ft long.
X
and
ruggedly
Historically,
and temperatures
to
cable
of 350
mill
weight
stuck
logging
the
at
overcome
it
is
built
difficult
overshot
overshot.
%in.).
shape,
information-
tool
technique
of 300
tool
and associated
to
the
stuck logging tool.
up.
is
a
cut-
allow
matching,
They are
to
formation
10
If
If