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Subsea System
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Subsea Wellhead SystemsFor deepwater and shallow-water applications
SUBSEA SYSTEMSSUBSEA SYSTEMS
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CAMERON TECHNOLOGY LEADERSHIP LEADS TO WELLHEAD ADVANCEMENTS
Cameron has a long history of product innovation, and the evolution of the subsea wellhead product line is a
prime example of the continuation of this heritage.
Camerons experience in pressure control can be traced
back to 1922 and the introduction of the first BOP.
Other Cameron innovations through the years include
the first subsea wellhead completion, introduction of the
legendary U BOP, the first hydraulic production control
system, the first guidelineless drilling system and the first
free-standing drilling riser.
In the late 1980s, Cameron introduced two new wellhead
system designs the STC-10 and the STM-15. Since
then, nearly 1000 STC-10 and STM-15 subsea wellhead
systems have been installed successfully throughout
the world.
More advances are on the horizon. As the industry moves
forward, Cameron is here with the latest technology.
Table of Contents
STM-15 Type DW5 Deepwater High-Capacity Subsea Wellhead System
STM-15 Type XL5 Deepwater Large-Bore Subsea Wellhead System
STM-15 Type XL7 High-Capacity Ultra-Deepwater Subsea Wellhead System Wellhead Connection Profiles
STC-10 Compact Subsea Wellhead System
Casing Hanger Seal Assembly Running Tools for STM Subsea Wellhead Systems
High-Capacity Running Tools for STM-15 Subsea Wellhead Systems
STM Parallel Bore Metal-to-Metal (PBM) Seal
Optional Trip-Saving Running Tools
Supplemental Hanger Systems for STM-15 and STC-10 Subsea Wellhead Systems
STM Large Diameter Shoulder-Type Supplemental Hangers
Innovation and Quality
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STC-10 Subsea WellheadWS2 Subsea WellheadWS1 Subsea Wellhead STM-15 Subsea Wellhead
To 1980 1980 - 1988 1989 - Present 1992 - Present
CAMERONS WELLHEAD HISTORY
The offshore Equatorial Guinea development is located in water
depths to 2400 ft (732 m). The initial development included more
than fifteen STM-15 subsea wellheads, and expansion of the field
is ongoing with six additional installations scheduled for 2011.
The South China Sea development is located in approximately
2700-ft (823 m) water depths. The initial development included
five STM-15 subsea wellhead systems with subsequent additions
of two STM-15 subsea wellheads and completion systems.
South China Sea DevelopmentEquatorial Guinea Development
Camerons wellhead systems are offered as part of our total subsea drilling and production systems. Installed in producing fields
around the world, these systems consist of wellheads, subsea Christmas trees, flowline connection systems, production manifolds
and production controls systems. Cameron systems have been installed at various water depths as well as in operating pressures
up to and including 15,000 psi.
FIELD ExPERIENCE
SUBSEA SYSTEMS
STM-15 Type DW5 Deepwater High-Capacity Subsea Wellhead System
Camerons STM-15 Type DW5 15,000 psi WP Subsea Wellhead
System delivers up to 5.25 MM ft-lb bending capacity for
enhanced performance for drilling and completion in water
depths up to 10,000 ft (3048 m).
Active pre-load lockdown at 2 MM lb
5.25 MM ft-lb bending capacity
Standard and high-capacity 16 supplemental hangers and adapters are available
Machined from F-22, 85 ksi yield forged material
Available for H2S service
7 MM lb end-load carrying capacity on single- landing shoulder for deep wells with complex casing programs
18.63 Bore17.83 Min. ID7 MM lb End-Load Capacity Landing Shoulder
High-Pressure Housing Joint Wellhead on CNC MachineSTM-15 TYPE DW5 DEEPWATER
HIGH-CAPACITY SUBSEA WELLHEAD SYSTEM
Camerons deepwater STM wellheads meet the requirements
for most subsea drilling operations with deepwater semisubmers-
ibles and drillships, as well as production applications such as
tension-leg platforms, deep-draft caisson vessels and all types
of subsea trees.
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Camerons unique PBM metal-to-metal seal is standard in all 15,000 psi WP systems and has delivered superior performance in nearly 20 years of installation history.
STM-15DW Wellhead System 36 X 20 X 16 X 13-3/8 X 9-5/8 X 7
16 Casing Hanger System
18-3/4 15,000 psi WP High-Pressure Wellhead
w/Active Pre-Load Lockdown,Gasket Seal and Hydrate Seal
36 Conductor Housingw/Eight 3 Flow-By Holes
18-3/4 Wellhead Housing20 x 0.812 Wall Extension
13-3/8 Casing
9-5/8 Casing
Seal Assembly (Typical)
Hydrate Deflectorw/Bullseye
16 Seal Assembly
16 Receptacle
16 Casing Hanger
20 x 0.812 WT Wellhead Housing Joint
36 x 2.0 WT Conductor Housing Joint
STM-15 Type DW5 Deepwater High-Capacity Subsea Wellhead System 36 x 20 x 16 x 13-3/8 x 9-5/8 x 7
3 Ball Valvew/Pipe Extension(Typical Installation)
7 Casing
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STM-15DW Wellhead System 36 X 20 X 16 X 13-3/8 X 9-5/8 X 7
16 Casing Hanger System16 Casing Hanger System
SUBSEA SYSTEMS
STM-15 Type XL5 Deepwater Large Bore Subsea Wellhead System
Camerons STM-15 Type XL5 Deepwater Large Bore Subsea
Wellhead System is rated at a full 15,000 psi WP for drilling
and completion operations in water depths up to 10,000 ft
(3048 m). This system is used when it is necessary to run 18
casing in addition to 16. The wellhead has an 18-1/2 mini-
mum ID bore in the bottom to pass 18 casing. As with the 16
casing hanger, the 18casing hanger has a landing adapter
that is welded into the 22 (instead of 20) casing below the
high-pressure housing and the 16 adapter, allowing installa-
tion through the riser and BOP stack. This wellhead system is
an ideal solution for shallow-water flows and to accommodate
small bore-pressure/fracture gradient differentials.
Active pre-load lockdown at 2 MM lb
5.25 MM ft-lb bending capacity
3 MM lb tensile capacity
Machined from F-22, 85 ksi yield forged material
Available for H2S service
Multiple-landing shoulder with 7 MM lb end-load carrying capacity
18.63 Bore18.510 Min. ID7 MM lb End-Load Capacity Landing Shoulder
STM-15 Type XL5 Wellhead Housing
STM-15 TYPE XL5 DEEPWATER LARGE BORE SUBSEA WELLHEAD SYSTEM
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Camerons unique PBM metal-to-metal seal is standard in all 15,000 psi WP systems and has delivered superior performance in nearly 20 years of installation history.
The STM-15 Type XL5 Deepwater Large Bore Subsea Wellhead
System is used with the STM-15 trip-reducing, high-capacity
running tools and is available with the three most common
wellhead connection profiles. A standard 4130 extension joint is
added to the bottom of the high-pressure housing for
increased weld compatibility with various casing grades, and
other materials for the extension can be
supplied when required. Guide bases and
mud mats with hydrate seals and flow rings
are available upon request.
STM-15 Active Lockdown XL Bore Wellhead System 36 X 28 X 22 X 18 X 16 X 13-3/8 X 9-5/8
16 Casing Hanger System
18 Casing Hanger System
18-3/4 Wellhead HousingSTM-15 Large Bore
Wellhead HousingRunning Tool
Active LockdownAssembly - Unlocked
16 Landing Sub22 OD x 18.38 ID
16 PBM Seal Assembly
16 Casing Hanger
16 Casing Flush orNear Flush Casing Connections
18 Landing Sub22 OD x 18.25 ID
18 Casing Hanger18.43 OD x 16.60 ID
18 Casing FlushCasing Connections
18 Seal Assembly
18-3/4 Seal Assembly
9-5/8 Casing Hanger
Active LockdownAssembly - Locked
18-3/4 Typical Seal Assembly
36 Conductor Housing
13-3/8 Casing Hanger
36 Conductor Pipe
22 Extension Pipe
13-3/8 Casing
10-3/4 Casing
28 Receptaclew/Vertical Flow-By
28 SupplementalCasing Hanger
28 Supplemental Casing
12 x 12 Mud Matw/Split Lock Ring Lip
and Hydrate Seal
STM-15 Type XL5 Deepwater Large Bore Subsea Wellhead System 36 x 28 x 22 x 18 x 16 x 13-3/8 x 9-5/8
7STM-15 Active Lockdown XL Bore Wellhead System 36 X 28 X 22 X 18 X 16 X 13-3/8 X 9-5/8
16 Casing Hanger System
18 Casing Hanger System
STM-15 Active Lockdown XL Bore Wellhead System 36 X 28 X 22 X 18 X 16 X 13-3/8 X 9-5/8
16 Casing Hanger System
18 Casing Hanger System
16 Casing Hanger System
18 Casing Hanger System
SUBSEA SYSTEMS
Wellhead Connection Profiles BOP AND CHRISTMAS TREE CONNECTION PROFILES
Hub, mandrel or Camerons deepwater high-capacity (DWHC)
XL7 profiles are available on the high-pressure 18-3/4 housing,
depending on application requirements. The XL7 profile is an
ultra-deepwater solution to high bending requirements and is
applied primarily to the 30 diameter wellhead.
STM LOAD CAPACITIES
Hub Mandrel DWHCHub Mandrel DWHC
STM-15 Type XL7 High- Capacity Ultra-Deepwater Subsea Wellhead System
Cameron also offers a high-capacity subsea wellhead
system. The STM-15 Type XL7 Wellhead System features a
30 diameter high-pressure wellhead housing versus the
standard 27 housing. The system requires a 38 conductor
and low-pressure housing in order to receive the larger
diameter mechanical lockdown mechanism, which is activated
by the high-capacity mechanical lockdown tool. This system
was designed for ultra-deepwater drilling and production
applications using dual-activity dynamically positioned
drillships and deep-draft caisson vessels primarily, but not
limited to, water depths up to 10,000 ft (3048 m). This STM-15
Type XL7 delivers a 7 MM ft-lb bending capacity and 5 MM lb
tensile capacity, with a multiple-landing shoulder with
7 MM lb end-load carrying capacity.
Wellhead Housing Testing Lab
TypeBending Capacity
(MM)
Tensile Capacity
(MM)PSI
End- Load
Carrying Capacity
(MM)
Water Depths
(ft)
Standard Up to 4 2 15,000 7 2500
DW5 5.25 3 15,000 7 10,000
XL5 5.25 3 15,000 7 10,000
XL7 7 5 15,000 7 10,000
STM-15 DW5 Wellhead in Moonpool
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STM/STC SUBSEA WELLHEAD-TO-CONDUCTOR HOUSING LOCkDOWN OPTIONS
The STC-10 wellhead has a similar passive lockdown mechanism which provides a 1.5 MM ft-lb bending capacity and 0.5 MM lb
tensile capacity.
STM-15 Type DW5 and XL5 wellheads are available with an active pre-loaded option using a mechanical lockdown tool. The two
housings are pre-loaded together using this mechanical tool resulting in a 2 MM lb pre-load which increases the bending capacity
to 5.25 MM ft-lb with a 3 MM lb tensile capacity.
The STM-15 Type XL7 is an active pre-loaded wellhead design with a 30 O.D. high-pressure housing which delivers 7 MM ft-lb
bending capacity and 5 MM lb tensile capacity.
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STC-10 Passive Lockdown
STM-15 Type DW5, STM-15 Type XL5 and XL7
2 MM lb Mechanical Lockdown
SUBSEA SYSTEMS
STC-10 Compact Subsea Wellhead System
The STC-10 Compact Wellhead System is a popular choice for
low-pressure wells up to 10,000 psi WP and moderate well
depths. Simplicity and attractive pricing make the STC-10
wellhead system a cost-effective choice.
The STC-10 wellhead system uses Camerons metal-end cap
(MEC) seal. This elastomeric sealing element is rated a full
10,000 psi WP and made of proprietary CAMLAST
elastomer which is rated for temperatures up to 250o F
(121o C). It 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
reduce extrusion limit exposure of the elastomers to
corrosive well fluids and discourage roll off during
installation. The MEC seal is highly tolerant to seal area
damage and will often seal when other types of seals will
not. The seal is radially energized and requires less energy
to set than other seals.
Available in a five-string casing program
Also available in a six-string program utilizing a 16 supplemental hanger system
Jet-in/drill-ahead tools are available for even faster run times
STC High-Pressure Housing Joint
18.69 Bore17.83 Min. ID3.5 MM lb End-Load Carrying Capacity Landing Shoulder
STC-10 COMPACT SUBSEA WELLHEAD SYSTEM
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16 Casing Hanger System
STC-10 Wellhead System 30 X 20 X 16 X 13-3/8 X 10-3/4
STC-10 Compact Subsea Wellhead System30 x 20 x 16 x 13-3/8 x 10-3/4
10-3/4 Casing Hangerw/Inconel 625 Inlay
16 Casing Hanger System
13-3/8 Casing Hanger w/Inconel 625 Inlay
STC-10 Seal Assembly
13-3/8 Dummy Hanger
STC-10 30 Conductor Housing w/1.50 BWP Down
STC-10 18-3/4 Wellhead Housing
w/H4 Profile,16 Receptacle and
20 x 0.625 BWP
Adapter w/ThreadedOutlet Ports
(Optional)
16 Receptacle 16 Casing Hanger,16 3000 psi Seal Assembly
Retrievable/ReinstallableGuide Base w/0-5
Slope Indicator
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16 Casing Hanger System
STC-10 Wellhead System 30 X 20 X 16 X 13-3/8 X 10-3/4
3 Ball Valvew/Pipe Extension(Optional)
SUBSEA SYSTEMS
Casing Hanger Seal Assembly Running Tools for STM Subsea Wellhead Systems
Casing Hanger Seal Assembly Running Tools (CHSARTs) are
single-trip tools that allow installation of the casing hanger
and PBM metal-to-metal seal assembly in a single trip.
Cameron offers these tools in a variety of load capacities and
sizes for all of our wellhead systems.
There are three tools available for the 18-3/4 15,000 psi WP
wellhead systems depending on the load requirement:
1 MM lb, 1.5 MM lb, and a special high-capacity tool for the
first position hanger which provides 2 MM lb load capacity.
These tools are installed in the casing hanger using left-hand
makeup and right-hand release. Unlike standard systems,
which set the seal by closing the BOP rams on the running
string and pressuring the annulus, Camerons CHSARTs use
pressure down the drillpipe to hydraulically set the seal.
Annulus pressure is used only to test the seal. This hydraulic
system generates 200,000 lb of force to set the seal and only
requires 3500 psi fluid pressure through the drillpipe.
Single-trip tools are also available for the XL5 wellhead
system for the 16 and 18 casing strings and for the DW5
wellhead system 16 casing string. A 13 CHSART is
available for the DW5/XL5 slimline drill-through
conversion system.
18 CHSART16 CHSART
Seal AssemblyRunning Tool (SART)
Mill and Flush Tool
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Casing Hanger Seal Assembly Running Tool Operation
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1.5 MM lb CHSART1 MM lb CHSART 2 MM lb CHSART
1 MM lbCHSART
1.5 MM lbCHSART
2 MM lbCHSART
PBM Seal Assembly
PBM Seal Assembly
PBM Seal Assembly
STM-15 Casing Hanger
STM-15 Casing Hanger
STM-15 Casing Hanger
SUBSEA SYSTEMS
Drill Ahead Tool
MechanicalLockdown Tool
High-Capacity Running Tools for STM-15 Subsea Wellhead Systems
STM wellhead systems help reduce drilling costs
by eliminating unnecessary trips while providing
advanced pressure control technology with advanced,
trip-reducing, high-capacity running tools.
Camerons Drill Ahead Tool (DAT) allows for jetting in
the conductor, releasing the single-piece 1 MM lb load
capacity center stem and drilling ahead for the next
casing string. The tool permits a two-foot pickup of
the BHA without releasing the tool from the wellhead,
has a 6-5/8 standard top connection and drifts
10 collars.
Tools for running and handling the low- and
high-pressure wellhead housings are standard.
Camerons Mechanical Lockdown Tool (MLT) delivers a
2 MM lb mechanical pre-load between the low- and
high-pressure housings with a single 180,000 lb over-
pull, after running and landing the high-pressure
housing and 20/22 casing.
Installation of DW5 Wellhead Housing
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Jetting Drill Ahead
Landed Pre-Loaded
The center stem and BHA are released after jetting to drill ahead and retrieved with the BHA after drill out.
A 2 MM lb pre-load is achieved with a single 180,000 lb over-pull.
Mechanical Lockdown ToolDrill Ahead Tool
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SUBSEA SYSTEMS
Optional Trip-Saving Running Tools
Bit or BHA-run wear bushings and wear sleeves are available for
all of Camerons wellhead systems, in addition to three BOP test
tools to cover all situations for testing the BOP stack.
There are special tools for running the primary seal, secondary
seal and emergency seal assemblies separately from the hanger,
along with mill and flush tools to clean debris from the seal
area for all casing hangers.
Stabilizer and Running Adapters
STM Parallel Bore Metal-to-Metal (PBM) Seal
The PBM seal is used for casing hangers in the 18-3/4 15,000 psi
WP high-pressure housing and is interchangeable on all hangers
in the wellhead from 13-3/8 down to 7. It is radially engaged,
bi-directional and provides constant contact pressure on inner
and outer sealing surfaces. The PBM seal is designed for a
parallel sealing surface. It provides equal seal protection from
pressures above or below. Camerons parallel bore seal design
allows for vertical movement of the seal without affecting
seal integrity. During laboratory 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 up to 350o F (177o 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
elastomeric seal and a standard metal-to-metal secondary seal
that uses a protected, recessed area in the housing bore. The
lockdown feature for the seal to the wellhead has been physi-
cally tested to more than 1 MM lb at Camerons Technology
Development Center in Houston, Texas.
Standard Seal
Housing Lock Ring
Metal-to-MetalSeals
Actuating Ring
Hanger Lock Ring
Retainer Wire
Standard Elastomer Seal
Metal-to-Metal Seals
Metal-to-Metal Seals
Standard O-Rings
Wellhead Housing
Recessed SecondarySeal Area
Casing Hanger
B
B
BB A
A
A A
Wear Bushing
Wear SleeveWear Bushing and Wear Sleeve Stabilizer
Wear Bushing and Wear SleeveRunning Adapter
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Cameron offers a variety of supplemental
hangers and running tools. In the 20 or 22
casing strings below the high-pressure housing,
individual adapters can be used to suspend
and seal 16 hangers, both standard (3000 psi
WP/500,000 lb) and high-capacity (5000 psi WP/
1 MM lb). The XL high-pressure 16 hanger is
rated 6500 psi WP with metal-to-metal seals and
1 MM lb hang-off capacity. An 18 adapter and
hanger with a 3500 psi WP elastomeric seal and
1 MM lb hang-off capacity also is available for
use in Camerons STM-15 Type XL5 large-bore
subsea wellhead system.
Supplemental Hanger Systems for STM-15 and STC-10 Subsea Wellhead Systems
18 Supplemental Hanger
Locked to Adapter
Seal Assembly
LandingShoulder
Adapter
Hanger
16 xL High-PressureSupplemental Hanger
Locked to Adapter
Landing Shoulder
Adapter
Hanger
Locked to Hanger
PBM Seal Assembly
16 High-CapacitySupplemental Hanger
Locked to Hanger
Seals
Landing Shoulder
Adapter
Hanger
LockdownRing
STM Large Diameter Shoulder-Type Supplemental Hangers
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Cameron offers a variety of shoulder adapters for
supplemental hangers and running tools located below
the low-pressure wellhead in the 30 or 36 conductor
string. Weld-in shoulder type adapters and hangers can
be used for suspension and sealing of 26 and 28
supplemental casing strings.
26/ 28 Receptaclew/No Flow-By
26 Receptaclew/Horizontal Flow-By
26 Receptaclew/Vertical Flow-By
26/ 28 Casing Hanger
26/ 28 Casing HangerRunning Tool
6-5/8 Box
4-1/2 Pin
4-1/2 IF
Lock Dogs
SUBSEA SYSTEMS
Innovation and Quality
CAMERON IS A LEADER IN TECHNOLOGY DEVELOPMENTCamerons Technology Development Center is located
in Houston, Texas, and is equipped with state-of-the art
analysis and testing equipment. Cameron engineers
and technicians can perform a wide range of testing
procedures on new and existing products to help ensure
performance in the field.
TEST LABORATORY STATE-OF-THE-ART CAPABILITIES
Erosion A drilling fluids flow loop simulates the ero-sive effects of cuttings and sand flowing up from the well during drilling. It can circulate up to 6.2 barrels per minute at 5000 psi WP.
Flow Loop It empirically determines the flow characteristics, Cv, of various flow control devices.
Fatigue A load frame with a fixed tail stock on one end and a rotating spindle on the other is used for dynamic bend testing with up to 20,000 lb of deflection load to provide simulation of undersea wave action.
Pull/Push Rams Large hydraulic rams simulate tubing and casing loads on wellhead slips and hangers or drill-pipe suspension loads on ram BOPs.
Test Pits Two 25-ft deep floodable test pits allow as-sembly of tall equipment such as BOP stacks. With a specially constructed cover in place, they can serve as a blast mitigation chamber for higher-risks tests.
Corrosion A salt fog cabinet is used for accelerated corrosion testing on samples. It is used for corrosive resistance evaluation of coatings, plating and corrosion inhibitors.
Subsea Pressure The hyperbaric chamber is rated for pressures of water depths in excess of 10,000 ft (3048 m).
Pressure Hydrostatic testing is performed with a variety of pumps capable of producing up to 40,000 psig. Gas testing is conducted in reinforced test cells with gas boosters generating up to 36,000 psig.
Bending Two large test frames are available for structural bending and torsion tests. The larger frame can sustain up to 15 MM ft-lb of bending load.
Temperature Extremes Several test chambers are utilized for testing at temperatures ranging from -100o F to 500o F (-73o C to 260o C).
Hot Oil One fixed 106-kw and two portable 30-kw hot-oil circulating units produce internal bore tempera-tures up to 400o F (204o C) on products as large as a subsea BOP or as small as a 2 gate valve.
Experimental Stress Analysis Hundreds of bonded resistance strain gauges, used primarily for empirical verification of finite element analysis, are available for use during testing.
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CAMERON INTERNATIONAL MALAYSIA SYSTEMS CENTER OF SUBSEA WELLHEAD MANUFACTURING ExCELLENCE The Cameron International Malaysia Systems (CIMS) manufacturing facility is Camerons center of excellence for
the manufacture of subsea wellhead systems worldwide. The plant offers unique and highly efficient systems
and equipment specifically tailored to the production of subsea wellhead systems.
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SUBSEA SYSTEMS
2SUBSEA SYSTEMS
PO Box 1212Houston, Texas 77251-1212 USATel 1.713.939.2211
5 Mondial WayHarlingtonHayes, UB3 5AREngland, UKTel 44.208.990.1800
Level 11, 12-14The EsplanadePerth, Western Australia6000Tel 61.8.9483.4444
Learn more about subsea wellhead systems at:www.c-a-m.comor email:[email protected]
HSE Policy StatementAt Cameron, we are committed ethically, financially and personallyto a working environment where no one gets hurt, nothing gets harmed.
2011 Cameron | U BOP, STC-10 and STM-15 Subsea Wellhead Systems and PBM Seal are trademarks of Cameron. Inconel is a registered trademark of INCO. | SWP 1M | 08/11, TC9992