PRESSURE
TM
Certified System Components
Subsea Wellheads For deep and shallow water applications
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 introduction of the first BOP that became an industry 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 freestanding riser system — these are just a
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
few familiar milestones along Cameron’s path of leadership.
Cameron’s most advanced, field proven pressure-control technology is pre-engineered into the STM wellhead.
This leadership continues today with such innovations as the SpoolTree™ Christmas tree and the MOSAIC™ (Modular Subsea and Integrated Completions) Production System.
Three connection options (mandrel, hub and DWHC) High pressure 18-3/4” housing
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.
Angled shoulder prevents debris accumulation Optional passively activated, preloaded lockdown
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
High strength landing shoulder on 18-3/4” housing
1962: The industry’s first subsea wellhead completion is a Cameron Christmas tree in the Gulf of Mexico.
Optional 16” casing hanger available for six-string programs (see page 5) SD016697
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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 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.
Modular Subsea And Integrated Completion systems: The MOSAIC concept MOSAIC is the result of a design philoso-
are modular at the component level,
phy that eliminates the usual tradeoffs you
standardized to work together in many
expect with a pre-engineered, modular
combinations. The result is a cost-effective
system. With MOSAIC systems, you gain
system that can be adapted to virtually any
simplified installation procedures, reduced
subsea job. The MOSAIC system is more
personnel training
easily expanded as
and faster delivery.
field development
Unlike ordinary systems, you don’t have
needs evolve, and its components contain
Three BOP and Christmas tree
to give up flexibility, expandability and
the technology that provides the perfor-
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-
desirable product features and benefits.
mance you need.
SD016797
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,
The ordinary approach to modularity
Cameron’s subsea wellheads are
is fixed assemblies run progressively to
an integral part of the MOSAIC system.
large structures, which are not appropriate
They’re the perfect fit for today’s subsea
for many applications. MOSAIC systems
economics.
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 H2S 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.
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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:
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.
Three STM wellhead-to-conductor housing lockdown options
STC Metal-End Cap seal. Field proven
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.
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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 H2S environments. The PBM seal assembly and highpressure housing design provides for two additional contingency seals: an optional elastomer seal and a metal seal
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 than ordinary seals. Well or test pressure compresses the elastomer, which adds to seal quality.
Parallel Bore Metal Seals Optional CAMLAST Insert Seal
Recessed Contingency Seal Bore
SD016230
PBM Seal in running position
PBM Seal in energized position
Single Trip Compact Subsea Wellhead System
16" Seal Assembly
17-13/16" I.D.
The totally weight-set and compact STC
with hub or mandrel BOP and Christmas
wellhead is a popular choice for lower
tree connection profiles.
pressure wells to 10,000 psi WP. Attractive
The STC wellhead uses Cameron’s
pricing and rig-time savings during installa-
proprietary Metal-End Cap seals with CAM-
tion make it the most cost-effective well-
LAST elastomer. When setting the seals in
head in its operating range.
the STC wellhead system, the seal cannot
The STC wellhead shares some of the
be completed unless the seal assembly is
same benefits as Cameron’s STM wellhead.
locked in place correctly, eliminating the
It has a compact design, casing hangers
possibility of a false test. Like the STM,
and seal assemblies that can be run in a
only four tools are required to run a five-
single trip and interchangeable parallel
string STC system.
16" Hanger
17-7/8" I.D.
bore elastomeric seal assemblies. It is sup-
Seal Area 18" I.D. DETAIL A 16" Receptacle
17-9/16" I.D.
An optional 16" hanger can be
plied with the “passive” lockdown, which
used in six-string casing programs. The
is standard on the STM wellhead. The 18-
16" hanger and seal assembly are run
3/4" high-pressure housing is available
in one trip.
SD016231
DETAIL A
18-3/4" Housing with16" Receptacle Attached
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.
Hub or mandrel connection profiles
High-pressure 18-3/4” housing
Single-trip casing hanger and seal assemblies Cameron weightset, Metal-End Cap elastomer seals Interchangeable seal assemblies on each casing hanger Optional 16” casing hanger available for six-string programs Passively activated, standard lockdown SD016696
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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.
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.
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
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. SD016798
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.
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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.
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.
SD016701
Running Tool for 18-3/4" Housing 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. 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.
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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
