Page 45: of Offshore Engineer Magazine (Aug/Sep 2016)

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operated vehicle) – enabling the cost API recommended 0.75in to 2in so the The SWC was then deployed on three

SUBSEA effective rigless deployment. ROV guide ROV could hold the tool more securely. more UKCS North Sea campaigns.

arms were added to the lifting sub and This campaign also led the tool to be “The second and third campaigns a breakthrough was added to allow redesigned with a 4.5in box connection, were for tier-two operators from mono- umbilicals or electrical ? ying leads so it could accommodate drill pipe and hull intervention vessels with deploy- to access apertures in the lower inter- a pad eye crossover to give the operator ment through an intervention tower,” face of the connector allowing electro more ? exibility on a campaign. Canny says. “The fourth campaign

Once the cuts were complete, the tool hydraulic continuity to the severance involved nine wells using a MODU and and wellhead were recovered over the tool or well. ROV stabilization bars, was run on drill pipe, which enabled side of the vessel. The operator's savings position markings, and a secondary the operator to run abrasive technology were signi? cant on this campaign due to failsafe mechanism were also added to from a MODU for the ? rst time glob- – the exceptionally low day rate and AHV the connector. ally demonstrating the ? exibility and availability compared to an intervention

The SWC can be used on all common capability of the SWC, and the value it vessel or MODU, Canny says.

18.75in bore wellheads, with mechani- delivers”. cal, abrasive, or explosive severance tools for P&A campaigns, and a small re-entry mandrel seal assembly for interventions.

Deployment can be vertical or horizontal, and operations would only be limited by the ROV’s limitations.

From when the project was sanc- tioned to the factory acceptance test (FAT), the development process came about quickly. “It took 28 days to go from a kickoff meeting, sitting in an of? ce, to delivery at a client-witnessed FAT,” Canny says.

Since then, four P&A campaigns on the UK Continental Shelf (UKCS) in the

North Sea have ran the SWC. “The ? rst campaign was a multi- operator campaign for one well using a monohull anchor handling vessel (AHV),” Canny says. “This proved to be the most challenging deployment; how- ever, it displayed the value of the SWC, without which the campaign could not have been performed.”

Performed in September 2015, the SWC was horizontally deployed through a small moonpool on an AHV with mini- mal on-deck equipment in 286ft water

PROVEN UNDER PRESSURE depth. The objective was to recover a 10M hub pro? le wellhead for a multi-op- erator intervention and P&A campaign.

OTC GREENLIGHT is pressure testing that

To achieve this, the operation required is more intelligent, more efcient, and more an abrasive cutting tool, supplied by accurate. one of the SWC project’s partners, to

OTC GREENLIGHT is a digital pressure testing cut through 30in, 13.375in and 9.625in software and service that shortens testing time casing. During operations, the ROV was and is easy to use. The system eliminates the subjectivity of circle chart readings improving able to hold onto the SWC; however, as reliability and operational efciency. The interface it began thrust for rotation, the manipu- is easy to read and all test data sequences are lator arms on occasion slipped down archived for frequency based evaluation and other analyses. OTC GREENLIGHT does not require the bar. This led to modi? cations of the benchmark tests and can be instantly deployed for

API ROV interfaces to allow the ROV to use. handle the tool better. On the lifting sub,

Expert analysis driven by real hands.

the ROV guide arms were lengthened and a positive stop was put on the end to give the ROV more area to grab and

Learn more at www.OTCompliance.com prevent it from slipping during rotation.

On the connector, the diameter of the stabilization bars was increased from the oedigital.com August 2016 | OE 47 046_OE0816_Subsea1Jerry.indd 47 7/22/16 11:54 PM