®
BOWEN
HIGH PRESSURE CASING PATCH
Introduction
General Description
®
The
Bowen
High
Pressure
Casing
Patch
is
an
external
catch
tool,
designed
to
engage
a
previously
prepared
fish,
pack
it
off,
and
become
a
permanent
part
of
the
repaired casing, pipe or
tubing.
The
same
dependable
method
of
engagement
and
®
release
which
is
utilized
for
Bowen
Overshots
is
®
employed
in
the
Bowen
High
Pressure
Casing
Patch.
This method assures positive engagement and a positive
seal
from
either
direction.
The
Patch
provides
a
permanent
connection,
which
remains
rigid
and
leak-
proof
for many
years
yet
it
can
be
released
if
ever
the
need arises.
®
Bowen
High Pressure Casing Patches will not
restrict
the
bore of
the casing or
tubing
in anymanner.
®
The Bowen
High Pressure Casing Patch
is composed of
three outside parts and
five
internal parts. This
simplicity
of design
ismatched by
the simple operation.
Use
®
The Bowen
High
Pressure Casing
Patch
as
indicated
is
used
to
repair a damaged
casing
string by
replacement
of
the
damaged
section,
without
having
to
remove
the
entire string of casing
from
the hole.
Where
the
upper
portion
of
a
casing
string
becomes
ruptured or disoriented
from
the
lower portion such as by
faulting
or
caving
of
the
formation,
crushing,
rupture,
or
backing
off,
the
upper
portion must
be
removed.
New
casing
is
then
replaced,
the
Bowen®
High
Pressure
Casing
Patch
forming
the
patching means
between
the
old and new strings.
Construction
®
The Bowen
High Pressure Casing Patch
is constructed
in
the
most
basic
manner
to
perform
the
functions
of
engaging
the
fish,
sealing off
the
fish, or
releasing, either
during
or
after
setting
operations,
should
this
become
necessary.
The
Top Sub
,
Optional
Extensions, Bowl
and
Guide
form
the outer assembly.
The
Top
Sub
has
an
upper
connection
to
match
the
running
string,
and
a
lower
connection
to mate with
the
Bowl. A
Top Sub Seal
is
located
immediately below and
above
the
lower
thread of
the Top Sub and Extensions.
Specifications
Maximum Recommended
Maximum Recommended
Casing Size
Maximum O.D.
Pressure Rating @ O.D.
Pull
Load @
0 Pressure
Pull
Load @ Max. Pressure
(inches)
(inches)
(psi)
(lbs )
(lbs )
f
f
13
s
16.750
15,000
2,632,000
445,000
11¾
14.500
15,000
2,013,000
387,000
9
d
12.375
15,000
1,561,000
412,000
9.688
15,000
1,045,000
337,000
7
9.063
15,000
919,000
342,000
7.125
17,000
642,000
238,000
6.000
17,000
488,000
218,000
Note:
The
pressure
ratings
and
pull
loads
listed
above
are
for
the maximum O.D.
Tools with
smaller O.D.’s
and
corresponding
lower
pressure
ratings
and
pull
loads
are
available
upon
request. New High Pressure Casing Patch
sizes
are
being
designed
and may
not
be
on
this
list. Call
sales
for
updated
information.
The
Bowl
has
an
upper
connection
for
the
Top
Sub,
an
area
of
length
into
which
the
Packer
Protector
slides
during
operation,
a
spiraled
section which
contains
the
engaging
Grapple,
a
space
for
the Mill
Control
Packer,
and a
lower connection
to accept
the Guide.
The Guide
is usually
flush with
the outside diameter of
the
Casing Patch, and cut
lipped. The primary purpose of
the
Guide
is
to
assist
smooth
entry
of
the
fish
into
the
catch
area of
the patch. A secondary
function
is
to maintain
the
inner working parts
in position.
®
The
inner
working
parts
of
the
Bowen
High
Pressure
Casing
Patch
are
the
Grapple
,
H.
P.
Packer
with
Metallic
Non-Extrusion
Rings
,
Mill
Control
and
Packer Protector
.
The
Grapple
is
essentially
a
cylinder
with
wickers
in
its
inside
diameter
for
engaging
the
fish,
and
spirals
on
its
outside
diameter
to mate
with
the
spirals
in
the
Bowl.
Both
the
wickers
and
the
spirals
are made
with
a
left-
hand
lead, which allow
release by
right-hand
rotation. The
Grapple has a
series of
longitudinal
slots which allow
the
Grapple
to
flex diametrically during operation.
The
H.
P.
Packer
is
a
double
lipped
sleeve
type
packer,
molded
in
one
piece
from
synthetic
rubber
compound.
The material
is chosen
to
include
the best combination of
properties
for general oil well
service.
It withstands most
well
fluids;
has
good
resistance
to
gas
invasion,
and
abrasion.
In
service,
the
outside
of
the
Packer
seals
against
the
inside
of
the
Bowl.
The
upper
lip
is
protected
from
damage
by
the
Packer
Protector,
until
the
entering
fish
pushes
the
Packer
Protector
up
out
of
the
way.
(The
Packer
Protector
comes with
optional
Shear
Pins,
upon
customer
request.)
The Mill
Control
serves
the
dual
purpose
of milling
off
burrs
from
the outside of
the
fish as
it enters
the assembly
and
serving
as
a
special
key
to
key
the
Grapple
to
the
Bowl.
The
Grapple
is
free
to
move
up
and
down
sufficiently
to engage or
release
the
fish, but
is prevented
by
the
Control
Finger
from
rotating.
Thus,
the
torque
required
to
release
the
assembly
may
be
transmitted
from
the
running
string
through
the
Top
Sub,
Bowl,
Control Packer and on
to
the Grapple.
1 3,4