bulk handling/tank cleaning
Norwegian-German team to work on drill cuttings
Far Serenade was the first vessel to use PG Marine’s PG-MACS tanks
s more and more drilling takes place offshore, so the volume of drill cuttings produced annually has grown, as has the need for a way of handling the material in a safe, secure and efficient manner.
A
Drill cuttings are produced when drilling for oil and gas. Drilling mud is used to cool and lubricate the drilling bit (or ‘crown’), and establish an overpressure in the well to avoid an uncontrolled blow-out when penetrating reservoirs or pockets with hydrocarbons and gas. The drilling mud is pumped down to the well under pressure, and returns to the surface through the risers, bringing with it rock, sediment, sand and other material. This material – the drill cuttings – also contains chemicals used for efficient drilling, and absorbs substances and liquids from the formations that are being drilled. The result mixed is an environmentally challenging ‘slop’ or waste fluid.
Carrying this waste fluid on deck is inefficient, potentially hazardous and time- consuming in terms of the numbers of crane lifts from a platform to the deck of a platform supply vessel (PSV), and from the PSV to a reception facility on land.
Over the years PG Marine and Putzmeister have both made significant contributions to
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PG Marine Group in Norway is collaborating with German pump manufacturer Putzmeister Solid Pumps to address the rapidly growing market for handling and transporting drill cuttings produced by the offshore oil and gas industry
developing safe, secure and efficient drill cuttings transportation below deck. Regular readers of OSJ will be familiar with PG Marine’s multi- application cargo tanks for PSVs, known as PG-MACS. PG-MACS offer shipowners an alternative to carrying drill cuttings in containers on deck. Putzmeister has also offered solutions through the delivery of highly specialised pumping solutions for rigs handling drill cuttings. By joining forces, PG Marine and Putzmeister hope to create a portfolio of drill cuttings handling solutions, from seabed to rig, from rig to ship, and from ship to shore, focussing on the safest, fastest and most cost-effective way of doing so. “Through access to Putzmeister’s high-
density, high-pressure pump solutions PG Marine and Putzmeister are able to offer solutions which meet all of the industry’s demands in this
highly sophisticated market,” said Roy Norum, CEO of PG Marine Group. “Using our PG-MAPS [multi-application pump solutions] drill
cutting subsea lift-
pump, we can offer an efficient, closed cycle pumping solution to extract drill cuttings from the drilling string on the seabed and pump this to the surface, thereby enhancing the performance of the drilling rig. On the rig, another version of PG-MACS, which we call PG-RigMACS – which could make use of Putzmeister’s high-density solids pumps – can transfer, store and discharge drill cuttings to a PSV. In its turn, the vessel will discharge the drill cuttings to the shore base, using a PG-MACS system below deck. “Here again, PG Marine and Putzmeister have developed solutions to efficiently receive, store and transfer drill cuttings to shore magazines or processing plants in which drill cuttings are turned into valuable construction material,” Mr Norum explained, noting that apart from PG-MACS, the company was also offering what he called a “volume-optimised transportation solution for high-density drill cuttings, which includes a rectangular storage silo discharge frame, feeder screws and high-density solids pump.” Mr Norum told OSJ, “We are attacking the
Offshore Support Journal I June 2012 I 53
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