Page 11: of Offshore Engineer Magazine (Sep/Oct 2019)

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LEADING OFF P&A modi? cations for offshore, including ing some start-up challenges, for sure, ects,” says Martin. “The next phase of the ability to skid around the drill deck but our initial shakedown will be useful evolution could be bringing in a low- and rotate the mast to align at the correct for learning how best to use it. How to cost conventional construction barge angle for each well. ef? ciently construct the modules, move with a crane, the slant unit and some

It’s a modular system, about 12-14 it around and apply those learnings to cement systems on it, to drive down the square meters in footprint and 30 meters future wells and decommissioning proj- costs further.” high, able to enter wells at angles from 90-45 degrees for all P&A operations, from wireline to milling operations and from pulling tubing to pulling conduc- tors. No single part weighs more than 30 metric tons, to make it easy to install us- ing a platform crane, and the total pack- age weighs under 200 metric tons. It has a self-propelled skidding base, powered by a hydraulic power unit, which means it can move around the well bay, while its rotary table can rotate through a full 360 degrees, so it can access each well with the help of a laser alignment tool mounted at the top drive on the top of the mast. During the design a 3D laser scan of each platform was done to make sure the design would be able to access each well. The mast itself is lowered or raised with a hydraulic cylinder which is then locked off, when in position.

The unit comes with a drilling control cabin with automated handling systems to minimize risk to personnel. “We also had to fabricate a bespoke blowout pre- venter (BOP) with a loading cradle so that it could handle 60-degree installa- tion to the wellheads,” says Martin.

Solving this problem has been a near- ly three-year challenge. But, following factory acceptance testing in June, the system is now built with well engineer- ing ? rm Petrofac and drilling operator

Borr Drilling have supporting its design and installation on the DP4 platform where in mid-August, it commenced its ? rst P&A operations. To support staff- ing on board the DP4 during P&A op- erations, Sprit Energy is using the Borr

Ran jack-up for accommodation.

Spirit Energy own the package, but says it would be willing to rent it, for anyone needing a modular P&A sys- tem – it being able to access vertical as well as slant wells. “We’re expect-

September/OctoBER 2019 OFFSHORE ENGINEER 11