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development,” Urquhart says.

Maersk will be using a newbuild heavy duty, JU-2000E jackup rig supplied by Hercules Offshore.

As well as accounting for the extra people on board needed for

Field of View future intervention work, the facil- ity has also been designed to take on intervention equipment. “Mid- life, most HPHT felds need some kind of intervention, such as scale squeeze or downhole safety valves checks,” Urquhart says. “Once the drilling rig has gone, the top deck is designed to have a heavy duty coil well intervention spread so that once the reservoir comes down to 10,000psi, we can run heavy duty well interventions.”

Construction underway

The Culzean wellhead jacket under fabrication.

With frst production planned for “Given the challenges of welding such storage and offoading vessel for the 2019, most of the key contracts have been heavy wall material we have elected, project (the company’s frst UK North awarded. Sembcorp Marine subsidiary where possible, to make sections utiliz- Sea project), at Sembcorp Marine’s Tuas SMOE is building the development’s ing the HIP process and connecting them and Tanjong Kling facilities. It will three topsides, the utilities and living together with Grayloc 15,000psi-rated have 350,000 bbl storage capacity, and quarters platform, the central process- hubs,” Urquhart says, “This eliminates an internal turret system supplied by ing facility including fare, the wellhead the need to weld completely.” MODEC subsidiary SOFEC. platform and fnally the two connecting “This small rate of waxy condensate bridges.

Fully rated has a big impact on the design of our The wellhead platform jacket and

While the pressure of the production liquid process facilities,” Urquhart says. heavy duty jackup are on schedule for stream at surface is dropped at the choke, “We have four stages of separation to get installation in Spring/Summer 2016, to the entire wellhead platform has been it to a point where it can be exported to start drilling the Culzean development fully rated to 15,000psi, with an over the tanker. Because the separation and wells. The jacket is being fabricated by pressure system, comprising four, fast- stabilization process takes the pressure so Heerema in Vlissingen, the well access acting 15,000psi gate valves from Bel low we then have off gas streams, which deck is being completed by Heerema

Valves, each weighing 6-tonne, compared need to be compressed all the way back Hartlepool. The heavy duty jackup will to just 500kg for an equivalent normal up to a much higher pressure in order be on contract from Hercules Offshore, pressure, normal temperature valve. By to export into the CATS transmission which is fabricating a new-build with taking the decision to have three separate system.” Sembcorp Marine at their Tanjong Kling facilities linked by bridges, Maersk has Maersk also wants to minimize man- facility in Singapore.

also been able to achieve a temporary ref- ning on the facility, by using an advanced Late October, the three topsides were uge impairment frequency of zero on the collaborative environment onshore with in the kick off and ramp up phase, with utilities and living quarters platform. real time data from the process and safety Sembcorp Marine subsidiary SMOE.

Exotic materials, primarily corro- equipment, via fber optic link. The living These will be assembled in the Admiralty sion resistant alloys and titanium are quarters has room for 140 people, but only yard facility in Singapore. SMOE have prevalent throughout the process piping half of that will be used in the early years, subcontracted the power generation mod- systems, separators, coolers, pumps and until later in feld life when the balance is ule, bridges and fare to their UK facility at valves due to the nature of the Culzean taken up by well intervention teams. Lowestoft.

gas and fuid properties and the tempera- The two remaining jackets have been

Future proofng ture and pressure that the systems are awarded to Heerema and they will be required to operate at. Due to the way HPHT felds deplete, fabricated in Vlissingen with six pile

Maersk also has another challenge the drainage strategy is also important clusters manufactured in Hartlepool.

– dealing with some 12% wax in the on Culzean. Maersk is pre-drilling three Going to press, KBR was awarded a condensate and the associated fow assur- of the six development wells, which detailed design and engineering and ance issues was the reason why the feld will come on stream sequentially at frst follow-on services contract by SMOE needed a foating storage and offoading gas effectively before virgin pressure for the topsides facilities on Culzean. vessel (FSO) instead of being able to pro- drops. “We want to put as many wells Specifcally, KBR will deliver the living duce as a tie-in to existing liquid export in the ground ready to produce as the quarters, central processing facility and infrastructure. challenges of depletion drilling after wellhead decks for the three Culzean

Japan’s MODEC is building the foating production have to be factored in to the platforms.

December 2015 | OE oedigital.com 20 018_OE1215_field of View.indd 20 11/21/15 12:33 AM