Roxar subsea ROV retrieval system

MODELINGINTERPRETATION SIMULATION WELL & COMPLETION PRODUCTION & PROCESS

Data Sheet

The Roxar subsea ROV retrieval system is a completesolution for retrieval and installation of instrumentationon trees, manifolds and process systems during production.These devices include sensors for monitoring pressure/temperature, sand erosion, corrosion or a combination ofthese conditions, for example.

Four main system componentsThe 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 retrievaltool basket.

A complete system for replacement of sensors on live hydrocarbon systems

The mechanical interface profile is designed to accom-modate different types of sensors. The sensor body andfixture attaches onto this interface, creating a leak-tightconnection that seals the surrounding environment fromthe process fluid. An electronics canister interfaces withthe sensor, and a specialised ROV tool replaces the sensorduring operation - with no disturbance to production.

A Joint Industry ProjectDeveloped through a Demo 2000 Joint Industry Project(JIP) between BP, Chevron, Shell, Total, Statoil and Roxar,the system is being qualified and will be extensivelytested, including shallow water testing with an ROV aswell as a pilot program. Su

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Head Office Tel: +47 51 81 88 00CIS Tel: +7 495 504 3405Europe Tel: +44 1224 215 700America Tel: +1 713 334 2222Middle East Tel: +973 17 517 111

Asia Pacific Tel: +603 2162 4450Australia Tel: +61 8 9315 9500Latin America Tel: +55 212 222 1941West Africa Tel: +27 71 60 61 737

For further information please contact your regional office or email: info@roxar.com or visit www.roxar.com.

www. roxar. com

MODELINGINTERPRETATION SIMULATION WELL & COMPLETION PRODUCTION & PROCESS

Ver. A - 230210Specif icat ions

Roxar subsea ROV retrieval system

For retrieval and installation of subsea sensors/transmitters

Mechanical Interface• 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)

Electronics Canister• 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

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

General SpecificationsDesign water depth:• 3,000 meters / 10,000 feet

Design life:• 25 years

Operating pressure:• 690 bar / 10,000 psi

Operating temperature:• 121º C / 250º F

System descr ipt ion Operat ional sequence

Permanently installed mechanical interfaceThe permanently installed mechanical interface includesthe pipeline hub with a guide helix and a guide funnel.This interface must be machined and installed on thesubsea structure before the structure itself is installed.Channels are machined from the areas within the inter-face to the hydraulic connection point for the ROV.These channels are used for pressure testing and flushing as well as integration with the actual retrievalprocess. Internally within the interface, a guide helixensures proper directional installation of the probe carrier. A funnel guides the electronics canister and theretrieval tool into place.

The sensor/transmitterThe sensor/transmitter includes a probe carrier, an electronics canister and a power/communication cable.The probe carrier has a number of features, includingthe primary sealing method which is a metal-to-metalEX gasket with two polymer seals. The electronics canister is locked to the hub with a mechanicallyoperated collet connector. The electronics inside the canister translates and transfers the signals from thesensor to the control module. The electronics canistercan be replaced separately from the probe carrier.

The ROV retrieval toolThe ROV retrieval tool includes a collet connector with a pressure vessel and revolver. This is central to theretrieval procedure, providing a metallically sealed, leak-proof connection to the system where the probecarrier is installed. The revolver has two chambers; onethat is pre-loaded with the new probe carrier and onethat accepts the current installed probe carrier.

The Hydraulic & Control SystemThe complete skidded Hydraulic & Control systemincludes an ROV, tool basket, HPU, hoses and connections and all essential tools. Attached as part ofthe ROV, the skid is the carrier used to transport the toolto its location. The skid also pumps and flushes fluidsthrough storage tanks and hydraulic and electrical couplings to enable the ROV to control the tool.Features include the tool parking panel which is parkedat the HUB during operation, the ROV retrieval tool, thehydraulic cable and other systems and equipment suchas pumps, etc.

Step 1: Remove the electronics canisterThe electronics canister is removed by pulling the releasehandle using the ROV manipulator arm (no hydraulicsinvolved). Before the electronics canister is removed, it is inspected for leakage using the ROV camera. Thepower and communication cable is also disconnectedand secured.

Step 2: Connect the retrieval toolSealing surfaces remain clean due to protection fromthe electronics canister. With no dirt or deposits on theseal faces, the retriever tool is inserted into the funnelby the ROV. The collet connector is then activated tosecure the connection. Testing of the seals is performedbefore the retrieval procedure begins.

Step 3: Retrieve the probe carrierThe tool cylinder is pressurised to just below line pressure, creating a pressure differential which unlocksthe locking mechanism within the probe carrier. Thecylinder pressure is decreased, thus transporting theprobe carrier into the revolver.

For pressureless systems, the necessary pressure differential is attained by routing the pressure channelsin the retriever tool to a vacuum tank, thus sucking theprobe carrier into the revolver.

Step 4: Load the replacement probe carrierThe revolver motor turns the revolver and exposes thenew probe. By increasing the pressure behind the newprobe carrier within the tool cylinder, the probe carriermoves into the mechanical interface and locks in place.

To ensure proper locking and sealing, the connectionbetween the probe carrier and the mechanical interfaceis thoroughly tested.

Step 5: Remove the retrieval toolFollowing thorough testing of the connection betweenthe probe carrier and the mechanical interface, the collet connector in the retrieval tool is deactivated andthe tool can then removed by pulling the handle. Thetool is then parked safely in the ROV tool basket.

Step 6: Install the replacement electronics canisterThe electronics canister can now be installed onto thehub with its mechanical operated collet connector. TheROV manipulator then connects the power and communication cable to the electronics canister.

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 parametersand 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 monitoringdevices as well as installation of new instrumentation on subsea production systems.

A number of sequential operational steps take place during a normal retrieval process.

Removal of the electronics canister

Connection of the retrieval tool

The probe moves into the revolver

The retrieval tool is removed

The mechanical interface

The probe carrier and electronics canister

The ROV retrieval tool

The skidded Hydraulic & Control System