dx® series - Dril-Quip

DRIL-QUIP, INC.
OFFSHORE DRILLING AND PRODUCTION EQUIPMENT
DX SERIES
®
SUBSEA CONNECTORS
www.dril-quip.com
Features and Applications
D
ril-Quip’s
DX® Subsea
Connectors are designed for
deep water, high wellhead pressure,
deep wells and long drilling times.
They are available in a variety of
designs and configurations and
can be modified to meet specific
customer requirements. The DX-10
Connector is pressure rated to 10,000
psi, and the DX-15 is pressure rated
to 15,000 psi.
Dril-Quip’s DX Subsea Connectors
offer the following unique features:
••High bending and tension capacity
••High load capacity before
hub separation
••Top connection can be a clamp,
flange or studded connection
••Tight load path through the upper
body, latch segments and wellhead
••Annular piston/cam ring design
maximizes locking force within a
smaller dimensional envelope
••Special seal design and stainless steel surfaces
extend seal life
••Self-locking taper on latch segments offer greater
locking reliability
••Quick unlatching time; meets all international
regulatory requirements
••Primary unlocking force 25% greater than
locking force
••Emergency secondary unlocking force 88% greater
than primary locking force
••Latching segments are automatically retracted
on disconnect
••Design includes primary metal-to-metal seal
profile with backup metal-to-metal profile for
emergency use
••Seals on the independent secondary release system
are not used during normal connector operation
••Design is compatible with existing blowout
preventor hydraulic control systems
••Design offers trouble-free, easy operation
••Performance is field proven
Dril-Quip’s DX Connectors are an excellent choice to
safely meet the ever-changing requirements for
subsea connectors.
2
Easily Retrofitted into
any Subsea BOP Stack
DX Connectors are
designed to be easily retrofitted into any
subsea BOP stack. Each
connector is available
with a mandrel and can
be used in the lower
marine riser package
for quick disconnect
from the main BOP.
Models Available for
Alternative Uses
Other uses for
Dril-Quip DX
Connectors are:
••Export Riser
Connector
••Surface BOP
Stack Connector
••Flowline
Connector
Ideal for Subsea Completion
For completion wells, the metal sealing profile on the DX
Connector ensures a metal-to-metal seal throughout the
long drilling, testing and production program. Even if the
primary metal-to-metal seal is damaged during drilling,
the DX Connector has an emergency backup metal-to-metal
sealing profile. This ensures a pressure-tight, trouble-free
connection between the completion tree and the wellhead.
Floating Production
Tie-Back Connectors
DX Connectors
are ideal for tieback applications.
DX Connectors
can be modified to
include mechanical locking and
unlocking features.
These features, combined
with high strength capacities, ensure a trouble-free,
rigid connection.
3
Design and Operations
Design Features Assure Positive Disconnects
DX Connectors incorporate three hydraulic circuits:
••Primary Lock
••Secondary Unlock
The primary locking circuit is optimized to
deliver maximum locking force to the annular
piston/cam ring.
In emergency situations, the independent
secondary unlock circuit functions a passive
secondary annular piston. The secondary
unlock piston unlocks the connector with
88% more force than the primary lock piston.
••Primary Unlock
The primary unlock circuit provides 25% more
unlocking force than locking force.
Secondary
Unlock Piston
Secondary
Secondary
Unlock Piston
Unlock
Piston
Hydraulic
Fluid
Hydraulic
Hydraulic
Fluid
Fluid
Locking
Segments
Locking
Locking
Segments
Segments
Annular
Piston/Cam
Ring
Annular
Annular
Piston/Cam
Piston/Cam
Ring
Ring
Arrow
Represents
Movement
DX Connector
in Locked Position
DX Connector
in Unlocked Position
Arrow
Arrow
Represents
Represents
Movement
Movement
DX Connector
in Unlocked Position
Using the Secondary
Unlock System
Latching Segments are Automatically
Retracted When the Connector is Unlocked
DX Connectors incorporate a
positive unlocking mechanism.
This mechanism ensures that
the latch segments are fully
retracted from the wellhead
when the connector is unlocked.
A spreader, attached to the
annular piston/cam ring, pulls
latching segments away from
the wellhead when unlock
pressure is applied and the cam
ring moves up.
4
Latch
Segment
Locked
Latch Segment
Unlocked and
Automatically
Retracted
Orientation
Slot
Gasket
Retainer/
Release
Lever
Primary
Lock Port
Ring Gasket
Retaining
Mechanism
Latch
Segment
Primary
Unlock
Port
Ring
Gasket
Annular
Piston/Cam
Ring
Secondary
Unlock
Port
Secondary
Unlatch
Piston
5
Testing and Technical Data
Computer Designed
Bending Moment (Million ft-lb)
3.5
Ratings based on finite element
analysis with:
(1) Constant latching pressure of
3,000 psi.
(2) Hub preload due to latching
pressure was 3.36 million lb.
3.0
2.5
0p
si I
2.0
nte
rna
l Pr
Int 10,00
ern
0
al P psi
res
sur
e
1.5
1.0
0.5
0.0
0.0
5.0
Bending Moment (Million ft-lb)
DX Connectors have been designed and analyzed using
finite element analysis. The analysis includes preloading
the connector in steps and applying separating forces
while observing the behavior of stresses throughout the
connector components. Particular attention has been
paid to the peak surface
stresses on the profile of
the latch segments and
bearing stresses between
the latch segments and
wellhead profile. Results
have helped optimize locking profile geometry and
overall connector design.
Analysis has also been conducted on the DX gasket
to observe the behavior
of contact stresses and the
gasket’s reaction to internal pressure. The result has
been a design for a wellhead connector with high
tensile and bending capacities, all within a smaller
dimensional envelope.
Hub Separation Loads for
Dril-Quip 18 3/4" 10,000 psi DX Connector
1.0
ess
ure
2.0
3.0
4.0
5.0
Axial Tension (Million lb)
6.0
7.0
Hub Separation Loads for
Dril-Quip 18 3/4" 15,000 psi DX Connector
Ratings based on finite element
analysis with:
(1) Constant latching pressure of
3,000 psi.
(2) Hub preload due to latching
pressure was 4.75 million lb.
4.0
0p
si I
3.0
Int 15,00
ern
0
al P psi
res
sur
e
2.0
1.0
0.0
0.0
1.0
2.0
nte
rna
l Pr
ess
ure
3.0 4.0 5.0 6.0 7.0
Axial Tension (Million lb)
8.0
9.0
10.0
The DX-15 Subsea Connector can withstand a bending movement of
2.1 x 106 ft-lb with 15,000 psi internal pressure and zero axial tension
Primary and Emergency
Metal-to-Metal Sealing
The Dril-Quip Wellhead and DX Connectors
feature a pair of independent metal-to-metal
sealing profiles. These two-step profiles
provide sealing surfaces for a primary DX
ring gasket and an independent secondary
(emergency) ring gasket. The first profile is
the primary metal-to-metal sealing surface. It
is used by a standard DX ring gasket during
normal drilling operations. This gasket also
protects a second metal-to-metal sealing
surface from damage.
Special bypass porting preserves the secondary sealing surface from damage. However,
should the primary sealing surface become
damaged, an emergency DX ring gasket can
be installed. It utilizes the secondary sealing
surface for a reliable metal-to-metal seal.
6
Primary Sealing
Surface (Metalto-Metal)
Secondary Sealing
Surface (Metalto-Metal)
Porting
Bypasses
Secondary
Sealing
Surface
Porting
Bypasses
Primary
Sealing
Surface
Primary
Sealing Surface
(Metal-to-Metal)
Secondary
Sealing Surface
(Metal-to-Metal)
Primary Ring Gasket
Emergency Ring Gasket
Dril-Quip’s DX Connectors are available in several pressure ratings. The DX-10 is a 10,000 psi rated connector and
the DX-15 is a 15,000 psi rated connector. Dril-Quip’s DX Connectors have been designed to incorporate latching
segments to allow them to be locked to all industry standard subsea wellhead locking profiles. This offers
maximum compatibility and flexibility when choosing a wellhead connector for the application.
Dril-Quip’s DX Connectors are also available in a variety of alternative configurations that include body sizes
that accommodate the standard 27" nominal OD subsea wellhead and 30" nominal OD deepwater subsea
wellhead systems. Conversion kits are available when switching wellhead OD sizes. For more information and
specifications, please contact your nearest Dril-Quip representative.
DX-10
DX-15
D
D
A
A
C
C
B
B
E
E
DX Drilling Connector Technical Specifications
Nominal Pressure
A
Rating
Size
(in)
(psi)
(in)
Load to
Hub
Separation*
Bending to
Hub Separation
(106 ft-lb)
Tension to
Hub Separation
(106 lb)
B
C
D
E
Preload
@ 3,000 psi
(in)
(in)
(in)
(in)
(106 lb)
(106 lb)
@ 0 psi
@ Work Press.
@ Work Press.
18 3/4
10,000
18.75
46.15 28.23
46.12
46.88
3.36
6.60*
3.24
1.62
3.30
18 3/4
15,000
18.75
51.75 33.33
53.25
54.00
4.75
9.00*
4.42
2.15
4.38
*Based on FEA, however load testing results were approximately 10% higher.
7
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