sub sea wellhead
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Subsea WellheadsFor deep and shallow w ater applications
Certif ied System Component sTM
P R E S S U R E
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The Cameron family of STM™and STC™subsea wellheads delivers the economic
benefits of modularity and the perfor-
mance benefits of advanced design.
These benefits mean faster delivery,
easier installation and reduced costs innearly every subsea drilling application.
And that is especially important for
today’s deepwater challenges.
With modularity at the component
level, there are no performance trade-
offs. 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
For more than seventy-five
years, the leader
Cameron’s experience in pressure control
can b e tra ced ba ck to 1922. The introd uc-
t ion of the f irst BOP that became a n indus-
try standa rd bega n an uneq ualed history
of inno vation. Type “ A” casing ha nge r,
All-Welded Bod y Ba ll Valve, first subsea
w ellhead completion, the legend ary U BOP,
first hydraulic production controls system,
first guidelineless drilling system, first free-
standing riser system — these are just afew familiar milestones along Cameron’s
path of leadership.
This lead ership con tinue s to da y
w ith such inno vat ions as the Spoo lTree ™
Christmas tree and the MOSAIC™ (Modular
Subsea and Integrated Completions)
Production System.
More advances are on the horizon.
As the industry pushes into new front iers,
w e’ ll be there, as a lways, with the
technology to do i t r ight .
Cameron’s most advanced, field p roven p ressure-contro l technolog y is
pre-engineered int o t he STM w el lhead.
Three connection
opt ions (mandrel,
hub and DWHC)
Angl ed should er
prevents debris
accumulation
Optio nal p assively activat ed, preloaded
lockdow n
Interchangeable
parallel bore metal seal assemb lies on
13-3/8”, 10-3/4"
(or 9-5/8”) and
7-5/8” (or 7")
casing hang ers
High strengthlanding shoulder
on 18-3/4” housing
High pressure
18-3/4” hou sing
Option al 16” casing
hanger available for
six-str ing program s
(see page 5)
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1962: The ind ustry ’s fir st subsea
w ellhead completion is a Cameron
Christmas tree in the Gulf of M exico.
Pre-engineered subsea w ellheads from Cam eron: few er t rips, low er cost sand bett er seal ing in shal low or deep w ater dri l l ing operat ions.
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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 applica-
tions with working pressures up to
15,000 psi WP, on single wells, multi-
well templates or TLP operations.
Versions of the STM are available for
shallow or deep water, and it is adapt-
able to casing programs with five or six
strings. Only four tools are required to
run a five-string STM system.
Three BOP and Chri stmas tr ee
connection prof iles. 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 petro-
leum industry without charge, to pro-
mote standardization among deepwater
producers and equipment suppliers.
High -pressure 18-3/4” hou sing . Rated
up to 15,000 psi WP, Cameron’s high-
pressure 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,
it does not add to wellhead height. The
receptacle does not restrict a 17-1/2" bitor 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 H2S service.
The STM design allows all BOP
tests to be performed with the wear
bushings in place, saving a round tripfor each test.
Hub M andrel DWHC
MOSAIC is the result of a design philoso-phy that eliminates the usual tradeoffs you
expect with a pre-engineered, modular
system . With MOSAIC system s, you g ain
simplified insta llation procedures, reduced
personne l training
and fa ster delivery.
Unlike ordinary systems, you d on’t h ave
to give up flexibility, expanda bility a nd
desirable product features and benefits.
The ordina ry approa ch to mod ularity
is fixed assemblies run progressively to
large structures, which are not appropriate
for many applications. MOSAIC systems
are modular a t the component level,s tandardized to wo rk tog ether in many
comb inat ions. The result is a cost-effective
system that can be a dapted to vir tually any
subsea job. The MOSAIC system is more
easily expanded as
field development
needs evolve, and its components contain
the technology t hat provides the perfor-
mance you need.
Cameron’s subsea wellheads are
an integra l part o f t he MOSAIC system.
They’re the perfect fit for t oda y’s subsea
economics.
Modular Subsea And Integrated Completion systems:
The MOSAIC concept
SD016797
STM w ellhead undergo es seal development
testing at Cameron’s new , state-of -the-art
Research Center i n Ho uston . This 55,000 sq ft
resource allow s us to d evelop and t est pro duct
impro vement s more quickly. In the photo at
r ight , the STM is show n in one of our two
25 f t deep, underwater s imulat ion tanks.
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Advanced lockdow n and sealing t echnology
A closer look at Cameron engineeringreveals advanced but practical technol-
ogy that works in the real world. A
remarkable history of pressure-control
experience has been pre-engineered into
our subsea wellheads. You can see ourno-compromise design in these features:
Three STM wellhead-to-conductor
housing lockdown options
Passively activ ated, p reloaded
lockdow n. 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 resis-
tance. 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 sepa-
rate trip, and the mechanism can be
fully recoverable and reusable. Eight,
two-inch diameter bypass holes provide
for cement returns.
Passivel y acti vat ed,
standard lockdow n.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.
High-capacity lockdow n. 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.
Cameron’s proprietary sealing
technology
STM Parallel Bore M etal 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, itprovides 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 maintain-ing 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 H2S environments.
The PBM seal assembly and high-
pressure 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 M et al-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 H2S, CO2, 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 thanordinary seals. Well or test pressure
compresses the elastomer, which adds
to seal quality.
Unlocked Locked
Paral
Bore
Meta
Seals
Opt io
CAML
Inser
Seal
Reces
Cont i
Seal B
PBM Seal in
running pos it ion
PBM Seal in
energized posit ion
Passively activated, preloaded lockdow n
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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 bot-
tom 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 to ta lly w eight -set an d comp act STC
w ellhead is a po pular choice for lower
pressure w ells to 10,000 psi WP. Attra ctive
pricing a nd rig-time savings during installa-
tion make it the most cost-effective well-
head in i t s operat ing rang e.
The STC w ellhead shares some of the
same b enef its as Cam eron’s STM w ellhead.
It has a compact de sign, casing hang ers
and seal assemblies that can be run in a
single t r ip and interchang eable pa rallel
bo re elasto meric sea l assemblies. It is sup-
plied w ith the “ passive” lockdow n, which
is sta nda rd o n th e STM w ellhead. The 18-
3/4" high-pressure housing is availab le
w ith hub or ma ndrel BOP and Christmas
tree connection profiles.
The STC w ellhea d u ses Ca mero n’s
proprieta ry Meta l-End Cap seals with CAM
LASTelasto mer. When setting the seals in
the STC wellhea d system, t he seal canno t
be completed unless the seal assembly is
locked in place correctly, eliminating the
po ssibility of a fa lse test. Like the STM,
only four too ls are required to run a f ive
string STC syste m.
An opt ional 16" hang er can be
used in six-string ca sing pro g ram s. The
16" hang er and seal assembly are run
in one trip.
High-pressure
18-3/4” h ousing
Passively acti vat ed,
standard lockdow n
Hub or
mandrel connection
prof i les
Cameron w eigh
set, Met al-End
elastom er seals
Optio nal 16” ca
hanger availabl
six-str ing pro gr
SD016696
Single-tr ip
casing han ger
and seal
assemblies
Interchangeable
seal assemb lies
on each casing
hanger
18-3/4" Housing
w ith16" Receptacle
Attached
DETAIL A
16" Hanger and
Seal Assemb ly Installed
in Receptacle
Single Trip Compact Subsea Wellhead System
17-13/16" I.D.
16" Receptacle
17-9/16" I.D.
16" Hanger
16" Seal Assembly
17-7/8" I.D.
Seal Ar ea 18" I.D.
SD016231
DETAIL A
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Guidebases and running t ools
The benefits of modularity are pre-engineered into Cameron’s remotely
retrievable/reinstallable guidebase
(RRGB). Guideline or guidelineless
versions of the RRGB are available.
Guide posts are permitted to strokeapproximately six inches to allow BOP
orientation prior to loading the post.
This reduces the risk of damage when
landing the BOP stack. Multiple guide-
bases 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.
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 hang-
ers and seals and perform seal tests;
• Wear bushing running/retrieving tool.
CHSART (Casing Hanger Seal
Assembly Running Tool)
Cameron’s advanced wellhead technol-
ogy includes running tools that con-
tribute to system cost savings and ease
of use. The CHSART tool is a perfectexample. 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.
The STM spring-lo aded lo cking m echanism
autom atically locks the 30” conductor ho using
to th e guidebase.
Casing h anger seal assembly is set by pressuring dow n t he dril l pipe,
w hich allow s the seal to b e set bef ore stack pressure is applied.
SD016800SD016799SD016798
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Ancillary equipment
Cameron’s STM/STC Running Tool Packag
are normally all that’s required to run five-
string systems under most conditions. In ad
tion, 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 (SAR
• 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 to
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SD016705
CHSART MultipurposeRunning Tool
Running Tool
for 18-3/4" Housing
SD016701
In a sing le tri p, th e Casing Hang er Seal Assemb ly
Runn ing Tool ru ns each casing h anger an d seal
assemb ly and hy draul ically sets the seal.
Af ter running the high -pressure
housing, th is tool is used to test
the BOP. A po sit ion ind icator rod
provid es visual verif ication o f
too l lock/unlock.
30” STM Conductor HousingRunning Tool
The 30” condu ctor housing runnin g too l
is cam-actuated and has a non-ris ing
stem. Only 6-1/2 rotation s fully make up
and release the t ool.
Wear Bushing Running andRetrieval Tool
This is the only to ol needed to set or
retr ieve all w ear bushings in a five-str ing
system including t he bore prot ector.
SD10457-99
SD10480-99
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© Cooper Ca meron Corpora tion , Camero n Division, Prin ted in USA, 7/98, HG/5M, WR6568/TC1266
Western Hemisphere
Cameron
PO Box 1212
Hou sto n Texa s 77251-1212Tel 713 939 2211
Fax 713 939 2620
www.camerondiv.com
Eastern Hemisphere
Cooper Cam eron (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. 3Jurong Tow n Post Office
Singapo re 629560
Republic Of Singap ore
Tel 65 8613355
Fax 65 8616197
www.camerondiv.com
MOSAIC, SpoolTree, STM, STC, CAMLASTa nd CAMSMARTare t rad ema rks of the Co ope r Camero n Corpo rat ion, Ca mero n Division.