Ver. A - 230210
Specifications
Mechanical Interface
General Specifications
• Integral flange (specialised), 690 bar / 10,000 psi
• Primary seal: EX ring - Inconel 718
• Secondary seal: O-ring - HNBR (Norsok M-710
compliant)
• Tertiary seal: O-ring - HNBR (Norsok M-710
compliant)
Design water depth:
• 3,000 meters / 10,000 feet
Electronics Canister
Operating temperature:
• 121º C / 250º F
Roxar subsea ROV
retrieval system
For retrieval and installation of
subsea sensors/transmitters
Design life:
• 25 years
Operating pressure:
• 690 bar / 10,000 psi
• Connection to probe carrier: 21-pin wet-mateable
ROV connector
• Connection to mechanical interfacer: collet
connector
• Connection between electronics canister and subsea
control module: standard oil-filled hose with ROV
connectors
Data Sheet
Retrieval Tool
• Weight: 120 kg (dry)
• Connection to mechanical interface: collet
connector
• Primary seal: EX ring - Inconel 718
• Secondary seal: O-ring - HNBR (Norsok M-710
compliant)
ROV Hydraulic & Control System
• Pump capacity: 7 l/min, 690 bar / 10,000 psi
• Reservoir capacity: 54 l
A complete system for replacement of
sensors on live hydrocarbon systems
Sundheim-Madison 02-2010
The Roxar subsea ROV retrieval system is a complete
solution for retrieval and installation of instrumentation
on trees, manifolds and process systems during production.
These devices include sensors for monitoring pressure/
temperature, sand erosion, corrosion or a combination of
these conditions, for example.
Roxar subsea ROV
retrieval system
Four main system components
The complete system consists of four main components;
a permanently installed mechanical interface, a sensor/
transmitter, the ROV retrieval tool and a Hydraulic &
Control System contained within a skidded ROV retrieval
tool basket.
The mechanical interface profile is designed to accommodate different types of sensors. The sensor body and
fixture attaches onto this interface, creating a leak-tight
connection that seals the surrounding environment from
the process fluid. An electronics canister interfaces with
the sensor, and a specialised ROV tool replaces the sensor
during operation - with no disturbance to production.
A Joint Industry Project
Developed through a Demo 2000 Joint Industry Project
(JIP) between BP, Chevron, Shell, Total, Statoil and Roxar,
the system is being qualified and will be extensively
tested, including shallow water testing with an ROV as
well as a pilot program.
w w w. r o x a r. c o m
For further information
please contact your
regional office or
email: [email protected]
or visit www.roxar.com.
INTERPRETATION
Head Office
CIS
Europe
America
Middle East
MODELING
Tel: +47 51 81 88 00
Tel: +7 495 504 3405
Tel: +44 1224 215 700
Tel: +1 713 334 2222
Tel: +973 17 517 111
SIMULATION
Asia Pacific
Australia
Latin America
West Africa
Tel:
Tel:
Tel:
Tel:
WELL & COMPLETION
+603 2162 4450
+61 8 9315 9500
+55 212 222 1941
+27 71 60 61 737
PRODUCTION & PROCESS
INTERPRETATION
MODELING
SIMULATION
WELL & COMPLETION
PRODUCTION & PROCESS
System description
Operational sequence
Permanently installed mechanical interface
The permanently installed mechanical interface includes
the pipeline hub with a guide helix and a guide funnel.
This interface must be machined and installed on the
subsea structure before the structure itself is installed.
Channels are machined from the areas within the interface to the hydraulic connection point for the ROV.
These channels are used for pressure testing and
flushing as well as integration with the actual retrieval
process. Internally within the interface, a guide helix
ensures proper directional installation of the probe
carrier. A funnel guides the electronics canister and the
retrieval tool into place.
Reliable and accurate monitoring of complex subsea production installations contributes to optimised production
and enhanced control. Subsea instrumentation must be accessed and installed subsea to read the desired parameters
and to transmit this information without breakdown or failure over the life span of the subsea production
installation. The Roxar subsea ROV retrieval system has been designed for simple retrieval of existing monitoring
devices as well as installation of new instrumentation on subsea production systems.
A number of sequential operational steps take place during a normal retrieval process.
The mechanical interface
The sensor/transmitter
The sensor/transmitter includes a probe carrier, an
electronics canister and a power/communication cable.
The probe carrier has a number of features, including
the primary sealing method which is a metal-to-metal
EX gasket with two polymer seals. The electronics
canister is locked to the hub with a mechanically
operated collet connector. The electronics inside the
canister translates and transfers the signals from the
sensor to the control module. The electronics canister
can be replaced separately from the probe carrier.
Step 2: Connect the retrieval tool
Sealing surfaces remain clean due to protection from
the electronics canister. With no dirt or deposits on the
seal faces, the retriever tool is inserted into the funnel
by the ROV. The collet connector is then activated to
secure the connection. Testing of the seals is performed
before the retrieval procedure begins.
The ROV retrieval tool
The ROV retrieval tool includes a collet connector with
a pressure vessel and revolver. This is central to the
retrieval procedure, providing a metallically sealed,
leak-proof connection to the system where the probe
carrier is installed. The revolver has two chambers; one
that is pre-loaded with the new probe carrier and one
that accepts the current installed probe carrier.
Step 1: Remove the electronics canister
The electronics canister is removed by pulling the release
handle using the ROV manipulator arm (no hydraulics
involved). Before the electronics canister is removed, it
is inspected for leakage using the ROV camera. The
power and communication cable is also disconnected
and secured.
The probe carrier and electronics canister
Removal of the electronics canister
Step 3: Retrieve the probe carrier
The tool cylinder is pressurised to just below line
pressure, creating a pressure differential which unlocks
the locking mechanism within the probe carrier. The
cylinder pressure is decreased, thus transporting the
probe carrier into the revolver.
For pressureless systems, the necessary pressure
differential is attained by routing the pressure channels
in the retriever tool to a vacuum tank, thus sucking the
probe carrier into the revolver.
Connection of the retrieval tool
The Hydraulic & Control System
The complete skidded Hydraulic & Control system
includes an ROV, tool basket, HPU, hoses and
connections and all essential tools. Attached as part of
the ROV, the skid is the carrier used to transport the tool
to its location. The skid also pumps and flushes fluids
through storage tanks and hydraulic and electrical
couplings to enable the ROV to control the tool.
Features include the tool parking panel which is parked
at the HUB during operation, the ROV retrieval tool, the
hydraulic cable and other systems and equipment such
as pumps, etc.
Step 4: Load the replacement probe carrier
The revolver motor turns the revolver and exposes the
new probe. By increasing the pressure behind the new
probe carrier within the tool cylinder, the probe carrier
moves into the mechanical interface and locks in place.
The ROV retrieval tool
To ensure proper locking and sealing, the connection
between the probe carrier and the mechanical interface
is thoroughly tested.
Step 5: Remove the retrieval tool
Following thorough testing of the connection between
the probe carrier and the mechanical interface, the
collet connector in the retrieval tool is deactivated and
the tool can then removed by pulling the handle. The
tool is then parked safely in the ROV tool basket.
The probe moves into the revolver
Step 6: Install the replacement electronics canister
The electronics canister can now be installed onto the
hub with its mechanical operated collet connector. The
ROV manipulator then connects the power and
communication cable to the electronics canister.
The skidded Hydraulic & Control System
The retrieval tool is removed