Standard Subsea Wellheads Oss Wellhead Brochure
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Integrated offshore
offering for reliable,
high-quality, and
capital-efficient
performance
Standard
Subsea
Wellheads
Standard Subsea Wellheads
Through standardized processes, common
core components, and qualified, field-proven
assemblies, OneSubsea can deliver standard
subsea wellheads anywhere in the world
within 6months.
These highly configurable solutions are
designed to bring greater efficiency and
reliability to subsea operations, enabling
project viability and helping you meet a range
of functionality requirements while driving
downcapex.
Since 1960, OneSubsea has
developed a legacy of efficient
wellhead delivery, supplying
more than 1,000 wellheads
around the globe. Our wellheads
are engineered with robust,
reliable technologies that
can be complemented with
expert services to maximize
capital efficiency and further
expedite delivery.
The OneSubsea wellhead portfolio covers a
broad range of applications. WellAnchor* subsea
wellhead systems feature trip-reducing, high-
capacity components that are interchangeable
for maximized versatility. The DW-5 and DW-5XL
models are rated to
■15,000-psi [1,034-bar] pressure
■5,250,000-ft.lbf [7,118,000-N.m] bending force
■10,000-ft [3,048-m] water depth
and the DW-5XL model accommodates large bores.
Advantages Flexible Functionality
Quality Control
The QC requirements for the wellheads are in
accordance with API Specifications 6A and 17D.
Our facilities are certified to APIQ1, and our
strategic subcontractors are certified to ISO9001.
Surveillance by independent competent bodies
facilitates preengineering of materials, which
enables preordering and, in certain cases, stocking
them to secure lead time and protect schedule.
Surveillance by customers is available during
factory-acceptance testing.
Materials
All material specifications used conform to
API 6A and API 17D and were chosen on a
component-by-component basis. Pressure-
containing components additionally conform
to DNV GL recommended practices (RP)
for steel forgings for subsea applications
(DNVGL-RP-0034). A range of standardized
material options is available based on
component criticality, manufacturability,
andenvironmental compatibility.
The standard wellhead is built from a suite of preauthored quality control, material, and welding
specifications that simplify and expedite our execution processes. OneSubsea works with approved
vendors to ensure that they can manufacture the required components, enabling high confidence
in quality and lead time.
Welding
Our welding procedure for subsea wellheads
conforms to API 6A, API 17D, ASME
Section IX, NACE MR0175/ISO 15156, and
DNVGL-RP-C203 fatigue classes F3, D, or C1.
Weld options
■Automated welding
■Weld reinforcement
■Automated flush grinding of weld joint†
† Fatigue class C1 only
18⁄-in WellAnchor Subsea Wellhead System Models
Bit-Retrievable Wear Bushings
18⁄-in Parallel-Bore Metal-To-Metal (MTM) Seal Assembly
DW-5 or DW-5XL
DW-5 or DW-5XL
Extreme efficiency for deepwater drilling by reducing downhole trips
DW-5XL
DW-5 DW-5XL
MTM Assembly Specifications
Pressure rating, psi [bar] 15,000 [1,034]
Lockdown capacity, lbf [N] 1,000,000 [4,448,222]
Temperature range, degF [degC] 0 to 300 [–18 to 148.9]
Overall height, in [mm] 12.92 [328.2]
Maximum OD, in [mm] 18.59 [472.2]
Minimum ID, in [mm] 16.91 [429.5]
Weight, lbm [kg] 135 [61]
Lightweight corrosion cap
Actuating ring
Housing lock ring
Hanger lock ring
Retainer wire
MTM seals
MTM seals
Recessed secondary seal area
Wellhead housing
Casing hanger
18⁄-in wellhead housing
Wear bushing
18⁄-in parallel-bore MTM
seal assembly
18⁄-in parallel-bore MTM
seal assembly
13⁄-in casing hanger
28-in casing hanger
16-in receptacle
16-in casing hanger
36-in casing
Datum
First-position DW-5
casing hanger
First-position DW-5XL
casing hanger
28-in casing hanger
Flow ring
Annulus ball valve
28-in casing
20-in casing
16-in casing
13⁄-in casing
9⁄-in casing
16-in parallel-bore MTM
seal assembly
Flow ring
36-in conductor housing
Flush plug
Slope indicator and bracket
Mudmat
9⁄-in casing hanger
OR
26-in casing hanger
Wear sleeve
Wear sleeve
running tool
18-in receptacle16-in receptacle
16-in casing hanger
16-in seal assembly
18-in seal assembly
18-in casing hanger
First-position
bit-retrievable wear
bushing running tool
Second-position
bit-retrievable wear
bushing running tool
First-position
bit-retrievable
wear bushing
Second-position
bit-retrievable
wear bushing
onesubsea.slb.com/standardization
*Mark of Schlumberger.
Other company, product, and service names
are the properties of their respective owners.
Copyright © 2017 Schlumberger. All rights reserved. 17-OSS-249140
Integrated offshore offering for reliable, high-quality,
and capital-efficient performance
Standard Subsea Wellheads
