Cameron Subsea Wellheads Brochure - cedip

PRESSURE
TM
Certified System Components
Subsea Wellheads
For deep and shallow water applications

2
Pre-engineered subsea wellheads from Cameron: fewer trips, lower costs
and better sealing in shallow or deep water drilling operations.
For more than seventy-five
years, the leader
Cameron’s experience in pressure control
can be traced back to 1922. The introduc-
tion of the first BOP that became an indus-
try standard began an unequaled history
of innovation. Type “A” casing hanger,
All-Welded Body Ball Valve, first subsea
wellhead completion, the legendary U BOP,
first hydraulic production controls system,
first guidelineless drilling system, first free-
standing riser system — these are just a
few familiar milestones along Cameron’s
path of leadership.
This leadership continues today
with such innovations as the SpoolTree
Christmas tree and the MOSAIC (Modular
Subsea and Integrated Completions)
Production System.
More advances are on the horizon.
As the industry pushes into new frontiers,
we’ll be there, as always, with the
technology to do it right.
1962: The industry’s first subsea
wellhead completion is a Cameron
Christmas tree in the Gulf of Mexico.
The Cameron family of STM and STC
subsea wellheads delivers the economic
benefits of modularity and the performance
benefits of advanced design.
These benefits mean faster delivery,
easier installation and reduced costs in
nearly every subsea drilling application.
And that is especially important for
today’s deepwater challenges.
With modularity at the component
level, there are no performance tradeoffs.
Cameron subsea wellheads contain
technology found nowhere else and
reflect the depth of our pressure control
experience. The STM wellhead, for
example, demonstrates our no-compro-
mise design approach with parallel bore
metal seals, better connection options
with BOPs and Christmas trees and
interchangeable components.
A selection of running tools (including
the unique CHSART tool - see page 7)
and ancillary equipment is also part of
the highest performing subsea wellhead
systems in the world’s offshore oilfields.
Single Trip Metal Seal Subsea
Wellhead System
The STM wellhead reduces drilling costs
by eliminating unnecessary trips while
providing the most advanced pressure
control technology, at any depth, in any
Cameron’s most advanced, field proven pressure-control technology is
pre-engineered into the STM wellhead.
Three connection
options (mandrel,
hub and DWHC)
Angled shoulder
prevents debris
accumulation
Interchangeable
parallel bore metal
seal assemblies on
13-3/8”, 10-3/4"
(or 9-5/8”) and
7-5/8” (or 7")
casing hangers
SD016697
High pressure
18-3/4” housing
Optional passively
activated, preloaded
lockdown
High strength
landing shoulder
on 18-3/4” housing
Optional 16” casing
hanger available for
six-string programs
(see page 5)

environment. Central to STM wellhead
performance is Cameron’s parallel bore
metal (PBM) seal technology, completely
different from competing tapered bore
designs and far superior.
The STM wellhead is perfect for most
subsea drilling and production applications
with working pressures up to
15,000 psi WP, on single wells, multiwell
templates or TLP operations.
Versions of the STM are available for
shallow or deep water, and it is adaptable
to casing programs with five or six
strings. Only four tools are required to
run a five-string STM system.
Three BOP and Christmas tree
connection profiles. Depending on
your requirements, choose from a hub,
mandrel or Cameron’s new deepwater,
high-capacity (DWHC) profile on the
high-pressure 18-3/4" housing. Cameron
is offering the DWHC profile to the petroleum
industry without charge, to pro-
Hub Mandrel DWHC
mote standardization among deepwater
producers and equipment suppliers.
High-pressure 18-3/4” housing. Rated
up to 15,000 psi WP, Cameron’s highpressure
housing provides a parallel
bore sealing surface design for the PBM
casing hanger seals. The high-pressure
housing will accommodate an optional
16" casing hanger and seal assembly.
Because the receptacle for the hanger
and seal is welded to the bottom of the
housing or anywhere in the 20" string,
SD016797
Modular Subsea And Integrated Completion systems:
The MOSAIC concept
MOSAIC is the result of a design philoso-
phy that eliminates the usual tradeoffs you
expect with a pre-engineered, modular
system. With MOSAIC systems, you gain
simplified installation procedures, reduced
personnel training
and faster delivery.
Unlike ordinary systems, you don’t have
to give up flexibility, expandability and
desirable product features and benefits.
The ordinary approach to modularity
is fixed assemblies run progressively to
large structures, which are not appropriate
for many applications. MOSAIC systems
it does not add to wellhead height. The
receptacle does not restrict a 17-1/2" bit
or full-bore running equipment.
This housing has a high-strength
landing shoulder rated to 7 million lbs.
The simple, passive design allows the
13-3/8" casing hanger to be reciprocated
inside the 18-3/4" housing without the
possibility of inadvertent setting. It is
fully rated for H 2S service.
The STM design allows all BOP
tests to be performed with the wear
bushings in place, saving a round trip
for each test.
STM wellhead undergoes seal development
testing at Cameron’s new, state-of-the-art
Research Center in Houston. This 55,000 sq ft
resource allows us to develop and test product
improvements more quickly. In the photo at
right, the STM is shown in one of our two
25 ft deep, underwater simulation tanks.
are modular at the component level,
standardized to work together in many
combinations. The result is a cost-effective
system that can be adapted to virtually any
subsea job. The MOSAIC system is more
easily expanded as
field development
needs evolve, and its components contain
the technology that provides the perfor-
mance you need.
Cameron’s subsea wellheads are
an integral part of the MOSAIC system.
They’re the perfect fit for today’s subsea
economics.
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4
Advanced lockdown and sealing technology
A closer look at Cameron engineering
reveals advanced but practical technology
that works in the real world. A
remarkable history of pressure-control
experience has been pre-engineered into
our subsea wellheads. You can see our
no-compromise design in these features:
Three STM wellhead-to-conductor
housing lockdown options
Passively activated, preloaded
lockdown. This locks the high-pressure,
18-3/4" housing to the 30" conductor
with twelve vertical pre-load segments,
in a collet finger design. This pre-loaded
lockdown offers superior fatigue resistance.
When locked down, bending and
axial loads are transferred from the BOP
stack to the conductor. Fatigue loading
of the 20" casing is eliminated.
Lockdown is achieved without a separate
trip, and the mechanism can be
fully recoverable and reusable. Eight,
two-inch diameter bypass holes provide
for cement returns.
Passively activated,
standard lockdown.
An outwardly biased,
split-metal ring is held
in position with a
keeper ring. The split
ring is compressed by
the inside diameter of
the 30” conductor
housing until it is
landed in a retainer
groove.
SD016698
High-capacity lockdown. Cameron’s
new high-strength, pre-loaded lockdown
is engineered for high-temperature
applications where thermal expansion
is a critical factor. This hydraulically set
lockdown offers outstanding bending
resistance. It is also ideal for deepwater
applications.
Unlocked Locked
SD016702 SD016703
Passively activated, preloaded lockdown
Cameron’s proprietary sealing
technology
STM Parallel Bore Metal seal.
This seal is for casing hangers in the
18-3/4" high-pressure housing and is
interchangeable on 13-3/8", 10-3/4”
(or 9-5/8") and 7-5/8" (or 7") hangers.
It is radially engaged, bi-directional,
and provides constant contact pressure
on inner and outer sealing surfaces.
Because the PBM seal is designed for
a parallel-bore sealing surface, it
provides equal seal protection from
pressures above or below. The inability
to effectively seal pressures from below
is a weakness of tapered-bowl seal
designs offered by some wellhead
manufacturers.
The Cameron parallel bore design
allows for slight vertical movement of
the seal without affecting seal integrity.
During lab testing, the seal assembly was
moved as much as 1/4" while maintaining
full test pressure of 15,000 psi. PBM
seals are rated for continuous operation
in temperatures of up to 350˚F (177˚C),
with excursions to 400˚F (204˚C), and
can be used in H 2S environments.
The PBM seal assembly and highpressure
housing design provides for
two additional contingency seals: an
optional elastomer seal and a metal seal
in a recessed bore. The metal seals on
the OD and ID always retain pressure
before the elastomer seal. The elastomer
seal is a true secondary seal.
PBM seals are set hydraulically with
Cameron’s CHSART running tool,
which runs the casing hanger and seal
assembly in one trip.
STC Metal-End Cap seal. Field proven
in hundreds of wells, the MEC seal
assembly is used in the 10,000 psi STC
wellhead. Rated for temperatures up
to 250˚F (121˚C), the proprietary
CAMLAST elastomer seal element is
resistant to H 2S, CO 2, chlorides, diesel
fluid and oil or water-based amine
corrosion inhibitors.
Stainless steel caps on the upper and
lower surfaces of the elastomer prevent
extrusion, limit the elastomer’s exposure
to corrosive wellbore fluids and prevent
seal roll-off during installation. The
Metal-End Cap seal will often work
when ordinary seals won’t because the
seal is highly tolerant of sealing surface
damage. The seal is radially energized
and requires less energy to set than
ordinary seals. Well or test pressure
compresses the elastomer, which adds
to seal quality.
PBM Seal in
running position
PBM Seal in
energized position
Parallel
Bore
Metal
Seals
Optional
CAMLAST
Insert
Seal
Recessed
Contingency
Seal Bore
SD016230

DETAIL A
18-3/4" Housing
with16" Receptacle
Attached
16" Seal
Assembly
17-13/16" I.D.
16" Hanger
17-7/8" I.D.
Seal Area
18" I.D.
16" Receptacle
17-9/16" I.D.
SD016231
DETAIL A
16" Hanger and
Seal Assembly Installed
in Receptacle
Optional 16-inch casing hanger
The 16" hanger and seal assembly are
available for both the STM and STC
wellheads in six-string casing programs.
The receptacle can be welded to the bottom
of the 18-3/4" high-pressure housing
extension or anywhere in the 20" string
so height is not added to the wellhead.
The receptacle contains a passive load
shoulder with a 17-9/16" minimum ID.
The shoulder is rated to 1.2 million lbs.
Full-bore running tools or a 17-1/2" bit
can be used without restriction.
The 16" boll weevil style hanger and
seal assembly are installed and tested in
a single trip without having to pull the
bore protector in the 18-3/4" housing.
A CAMLAST elastomer seal in the
assembly is energized to seal in the bore
of the receptacle. The seal location is
protected from drill string damage.
The totally weight-set and compact STC
wellhead is a popular choice for lower
pressure wells to 10,000 psi WP. Attractive
pricing and rig-time savings during installa-
tion make it the most cost-effective well-
head in its operating range.
The STC wellhead shares some of the
same benefits as Cameron’s STM wellhead.
It has a compact design, casing hangers
and seal assemblies that can be run in a
single trip and interchangeable parallel
bore elastomeric seal assemblies. It is sup-
plied with the “passive” lockdown, which
is standard on the STM wellhead. The 18-
3/4" high-pressure housing is available
High-pressure
18-3/4” housing
Single-trip
casing hanger
and seal
assemblies
Interchangeable
seal assemblies
on each casing
hanger
Passively activated,
standard lockdown
Single Trip Compact Subsea Wellhead System
with hub or mandrel BOP and Christmas
tree connection profiles.
The STC wellhead uses Cameron’s
proprietary Metal-End Cap seals with CAM-
LAST elastomer. When setting the seals in
the STC wellhead system, the seal cannot
be completed unless the seal assembly is
locked in place correctly, eliminating the
possibility of a false test. Like the STM,
only four tools are required to run a five-
string STC system.
An optional 16" hanger can be
used in six-string casing programs. The
16" hanger and seal assembly are run
in one trip.
SD016696
Hub or
mandrel
connection
profiles
Cameron weightset,
Metal-End Cap
elastomer seals
Optional 16” casing
hanger available for
six-string programs
5

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Guidebases and running tools
The benefits of modularity are preengineered
into Cameron’s remotely
retrievable/reinstallable guidebase
(RRGB). Guideline or guidelineless
versions of the RRGB are available.
Guide posts are permitted to stroke
approximately six inches to allow BOP
orientation prior to loading the post.
This reduces the risk of damage when
landing the BOP stack. Multiple guidebases
can be combined into a single,
pre-tested template. Any number of
wells can be accommodated through
multiples of the guidebases. Multi-well
units allow wellbores to be spaced as
closely as 7-1/2 ft on center.
SD016699
The STM spring-loaded locking mechanism
automatically locks the 30” conductor housing
to the guidebase.
Cameron STM/STC Running Tool
Package and ancillary equipment
The Cameron STM and STC Running
Tool Package includes the tools required
to run a five-string STM or STC system.
All these tools are simple to make up
and all release with right-hand rotation.
• Retrievable/reinstallable guidebase
running tool;
• 30" housing running tool;
• 18-3/4" housing and BOP test tool;
• Casing Hanger Seal Assembly Running
Tool (CHSART) to install casing hangers
and seals and perform seal tests;
• Wear bushing running/retrieving tool.
CHSART (Casing Hanger Seal
Assembly Running Tool)
Cameron’s advanced wellhead technology
includes running tools that contribute
to system cost savings and ease
of use. The CHSART tool is a perfect
example. In the STM system, it allows
installation of casing hangers and PBM
seal assemblies in one trip. The tool is
then used to hydraulically set the casing
hanger seal assembly in a unique way.
Unlike ordinary systems, which set the
seals by pressurizing the BOP stack to
pump the seal down, the CHSART tool
sets the seal assembly by pressurizing
down the drill pipe. This allows the seal
to be set before stack pressure is
applied. After the seal is fully set and in
position, the seal is tested using the
CHSART tool with stack pressure.
SD016798
Ancillary equipment
Cameron’s STM/STC Running Tool Packages
are normally all that’s required to run fivestring
systems under most conditions. In addition,
Cameron offers a complete line of
special-purpose tools:
• Jetting tool
• Boll weevil test tool with redundant seals
• Weight-set BOP tester
• One-trip Seal Assembly Retrieval Tool (SART)
• Temporary abandonment (TA) caps
• Emergency drill pipe hang-off tool
• Full-bore casing hanger running tools
• Hydraulic 30" running and tieback tool
• Casing hanger cleanout tool
• 30"/36" housing drill-ahead tool
• 18-3/4" housing retrieval tool
• Shallow water flow shutoff systems
• Tieback system
• CAMSMART downhole measurement tool
SD016799
Casing hanger seal assembly is set by pressuring down the drill pipe,
which allows the seal to be set before stack pressure is applied.
SD016800

SD10457-99
30” STM Conductor Housing
Running Tool
The 30” conductor housing running tool
is cam-actuated and has a non-rising
stem. Only 6-1/2 rotations fully make up
and release the tool.
SD10480-99
Wear Bushing Running and
Retrieval Tool
This is the only tool needed to set or
retrieve all wear bushings in a five-string
system including the bore protector.
Running Tool
for 18-3/4" Housing
SD016701
After running the high-pressure
housing, this tool is used to test
the BOP. A position indicator rod
provides visual verification of
tool lock/unlock.
SD016705
CHSART Multipurpose
Running Tool
In a single trip, the Casing Hanger Seal Assembly
Running Tool runs each casing hanger and seal
assembly and hydraulically sets the seal.
7

Western Hemisphere
Cameron
PO Box 1212
Houston Texas 77251-1212
Tel 713 939 2211
Fax 713 939 2620
www.camerondiv.com
Eastern Hemisphere
Cooper Cameron (U.K.) Ltd.
5 Mondial Way
Harlington
Hayes UB3 5AR
Tel 44 181 9901800
Fax 44 181 9901888
www.camerondiv.com
Asia Pacific/Middle East
Cooper Cameron (Singapore) Pte. Ltd.
No. 2 Gul Circle, Jurong Industrial Est
Locked Bag Service No. 3
Jurong Town Post Office
Singapore 629560
Republic Of Singapore
Tel 65 8613355
Fax 65 8616197
www.camerondiv.com
MOSAIC, SpoolTree, STM, STC, CAMLAST and CAMSMART are trademarks of the Cooper Cameron Corporation, Cameron Division.
© Cooper Cameron Corporation, Cameron Division, Printed in USA, 7/98, HG/5M, WR6568/TC1266