Guyana’s to start with offshore oilfield job, Liza Period 1, is on monitor to begin creation early future calendar year. The deepwater enhancement, 190 km (118 mi) offshore in the Stabroek block, should have a transformational effect on the Caribbean nation’s economy. It could also provide as a benchmark for the overall offshore market, due to the sturdy co-procedure in between operator ExxonMobil, its associates, and the project’s principal contractors. Most of the very same players are included in the Liza Period 2 enhancement, and the technical and organizational remedies that they have devised could be re-utilized or adapted above the up coming couple of several years for tasks on other found fields in the block.
The Liza Period 1 subsea amenities, put in in water depths of 1,500-1,900 m (4,921-6,233 ft), will be related to the FPSO Liza Destiny, a former VLCC transformed at Keppel Shipyard in Singapore below a plan managed by SBM Offshore. The vessel, which arrived in Guyana in late August, has been unfold-moored in 1,525 m (5,003 ft) water depth. It is built to make up to 120,000 b/d of oil and to retail outlet up to 1.6 MMbbl of crude, with associated gas remedy capacity of 170 MMcf/d, and water injection at close to 200,000 b/d.
ExxonMobil commissioned TechnipFMC to supply subsea creation methods for the 17 Phase 1 wells, comprising eight producers, six h2o injectors and three gasoline injectors. Saipem is the other principal offshore contractor, the scope of its agreement including style and design, supply and set up of the 6 steel catenary risers (SCRs), flowlines, jumpers and ancillary parts and installation of 5 manifold structures controlled by 5 umbilicals, and all other subsea hardware and connected regulate products. The enterprise has deployed the Saipem FDS2 as its principal installation vessel for this marketing campaign, supplemented by its latest vessel, the Saipem Constellation. DOF Subsea and a flotilla of scaled-down vessels are supporting some of the subsea activities.
Liza Phase 2 is a comparable, but bigger-scale development and the to start with to characteristic SBM Offshore’s standardized Quickly4Ward FPSO hull style and design. The Multi-Purpose Floater (MPF) will be fabricated at the Shanghai Waigaoqiao Shipbuilding property in China, with topsides integration and set up executed at Dyna-Mac and Keppel Shipyard in Singapore, under SBM’s supervision. The accomplished vessel will have potential to develop 220,000 b/d of oil, address 400 MMcf/d of connected fuel and inject h2o at up to 250,000 b/d.
For Period 2 SURF, ExxonMobil has re-engaged TechnipFMC and Saipem, with the former providing subsea creation methods for 15 producers, nine water injectors and six fuel injectors (30 wells in full), joined to eight manifold constructions. Saipem’s role addresses engineering, procurement, development and installation of seven output, two drinking water injection and two fuel injection flowlines 10 linked lazy wave SCRs 14 PLETs/FLETs/ITAs, 34 jumpers and other buildings and transport/installation of dynamic and static infield umbilicals, manifolds, suction piles, mud mats, traveling qualified prospects, to be followed by hydro-screening.
Saipem’s involvement in Section 1 commenced in late 2016 when the firm supported conceptual design and style of the risers, like verification of the proposed design method. The full SURF EPCI agreement award followed in 2017.
Early very last thirty day period, the organization experienced accomplished about 80% development for Section 1, with its most recent vessel the Constellation heading to Guyana to pull the pre-laid risers from the seabed for pre-commissioning and hookup to the Liza Future. The Constellation is also owing to put in the principal umbilicals, and to join the subsea pipelines and infrastructure to the FPSO. By now the company’s perform on the task is in its remaining levels, according to Giorgio Martelli, CEO of Saipem The united states.
“Phase 1 has been a groundbreaking job for the way that ExxonMobil has set up its contracting system,” Martelli advised Offshore. “Phase 2 is a greater variation but equivalent, with no essential variations in terms of the topology, offshore belongings and the know-how deployed.
Following in depth entrance-stop engineering design and style (FEED) to make certain that Section 2 would be feasible, the Stabroek block partners took a remaining expense selection to commence with the undertaking in Might 2019. “ExxonMobil was on the lookout to continue performing with the exact contractors, its technique centered on ‘best in class’,” Martelli described. “And this technique is operating simply because of the expected co-procedure and synergies amongst the shopper and the contractors. This is very important in Guyana, an undeveloped country in phrases of oil and fuel infrastructure, which did not even have a jetty to load equipment when preparing for Liza commenced.
“Another of ExxonMobil’s requests has been to leverage in-place nearby services, and Saipem has place ahead a daring prepare in this regard for Stage 2. For Phase 1, the enterprise did the utmost achievable to make certain in-state involvement in duties such as pipe storage and motion of supplies by partnering with a local logistic corporation, John Fernandes, for a nearby shore base and all the though managing their advancement into this new marketplace. In Stage 2, some of the jumpers will be fabricated in Guyana. But a whole lot of industrial infrastructure continue to needs to be organized, experienced and capable to worldwide standards in buy to enhance regional material in potential offshore initiatives.”
Saipem has subcontracted fabrication of some of its SURF structures to a variety of web sites in North The us, Europe and Asia, and has followed ExxonMobil’s guide by forming partnerships with its key suppliers to assure continuity and synergies for both equally Liza phases. One particular of the suppliers is Shawcor, which designed a new plant in Veracruz, Mexico, devoted to polypropylene insulation (utilized in this circumstance for coating of the creation flowlines). Sumitomo in Japan is production linepipe for equally tasks. Other vital contributors include things like New Industries and Gulf Island Solutions in Louisiana (fabrication of the flowline and pipeline termination structures).
The onboard vessel picture shows J-lay operations from the Saipem FDS2.(Courtesy ExxonMobil)
In accordance to Martelli, installation of the buoyancy program all through J-lay operations from the FDS2 is demanding but not unprecedented. “But in this circumstance, we went a person stage even further. Buoyancy ordinarily necessitates specialists onboard the vessel to physically install the buoyancy modules on the pipe working beneath high tensioner hundreds. We made a decision to style and design out that threat via a huge, automated ‘arm’ which lifts the buoyancy modules, clamps them onto the pipes and then tightens the bolts, with out the have to have for crew immediate intervention. This system was built from scratch and has been fitted to the FDS2.”
“Saipem has also designed and designed a customized machine for the pipe industry joints coating method on the vessel. ExxonMobil stipulated injection-moulded poly-propylene (IMPP), and there was no current program that could healthy on to our vessel (although there are versions for onshore application). We had to style a objective-constructed program that could conduct insulation of J-lay subject joints just after welding. It is a pretty complex method, but it did run effectively on the Section 1 flowlines. We do, even so, system enhancements to the procedure for re-use in Section 2.”
The Constellation will elevate and hook-up the risers for Stage 1 to the FPSO in a fairly common lazy-wave configuration, Martelli claimed.
The two vessels are the Saipem FDS2 and the Saipem Constellation, which collectively are dealing with the Liza Period 1 and 2 subsea installations.(Courtesy ExxonMobil)
As for conditions out in the industry, there experienced been no prior enhancement knowledge off Guyana, and functions have been so much extra demanding than experienced been anticipated. “Our crews encountered heavier seas for a more time time period, with higher waves, especially through June and July. Ailments improved in August, but however with a virtually regular important wave top of 2-2.6 m (6.5-8.5 ft) altogether, despite the fact that we did locate a way of dealing with this. The North Brazilian loop current usually stays off Brazil to the east, but some spin-offs can access Guyana, and this can impact the stability of the pipe tensioners.
“We are frequently gathering additional and a lot more environmental information during our offshore operations and making use of this to refine our engineering reports. ExxonMobil in turn will take our data and refines it for setting up of future growth phases. Jointly the venture also gets info from the drilling rigs that are at the moment working on the Stabroek block.”
ExxonMobil has implemented a 1 Workforce approach, involving a multi-disciplinary collaboration and shared eyesight involving the organization and its EPC and drilling contractors. Normal crew conferences this year have led to suggestions on offshore set up priorities and averting downtime by means of Simultaneous Functions (SIMOPS).
“From the commencing, ExxonMobil has been quite solid in pushing an extreme interface effort, largely between ourselves, SBM and TechnipFMC,” Martelli stated. “It has structured a venture management crew, with the leaders and engineers of the a few contractors heading as a result of detailed structure interfaces and operational organizing.
“Among the key benefits of these collaborations are guaranteeing that there are no surprises offshore, which in a position like Guyana would be extremely hard and high-priced. Every little thing requirements to work like clockwork.”
Last thirty day period ExxonMobil and SBM Offshore signed a long-expression agreement covering possible future FPSO orders. Even though the announcement did not specify orders for a lot more Quick4Ward hull floaters for long term projects offshore Guyana, the operator is operating alongside one another with the main Liza contractors to take a look at potential options, technical specifications, schedules and economics for a 3rd venture on the Stabroek block, concentrated on the Payara oilfield discovery, Martelli said. “My being familiar with is that ExxonMobil is hunting for a very long-time period partnership…and the organization is also searching at other assignments to appear in the upcoming.” •