Steel Catenary Risers News

(Photo: Subsea 7)

Subsea 7 to Install Risers at Lingshui 17-2

said it has been awarded a contract to install risers for CNOOC’s Lingshui 17-2 gas field development project in the South China Sea.The contract from Offshore Oil Engineering Co. (COOEC) — worth between $50 million and $150 million — will see Subsea 7 transport and install five steel catenary risers with diameters ranging from 10” to 18”.Project management and engineering will commence immediately at Subsea 7’s offices in Kuala Lumpur, Malaysia, with offshore operations taking place in the first half of 2021, the company said.The Lingshui 17-2 field is located in the

(Image: Subsea 7)

Reviewing Sapinhoá-Lula NE BSR System

required the installation of four huge 2,800ton submerged buoys approximately 250 meters below the surface. The system was designed to accommodate a combination of 45 risers/umbilicals for each field in a small area in a decoupled arrangement. Subsea 7’s scope was specifically 27 3.9km steel catenary risers of which 18 were 7.5-inch production lines, three 9.5-inch water injection lines and six 8-inch gas injection lines.Buoy Supported Risers (BSR)Petrobras and its partners selected the Buoy Supported Risers (BSR) system as the most effective solution for the project. Ivan Cruz, Senior Product

Image courtesy of 2H Offshore

2H Offshore Expands STREAM JIP

the first phase of the STREAM (STeel Riser Enhanced Analytics using Measurements) joint industry project (JIP) and has expanded the work into a second phase.The JIP’s participants include Anadarko, Chevron, ExxonMobil and Shell. In this collaborative effort, field data from four deepwater steel catenary risers (SCR) and one lazy-wave riser were used to provide a measurement-based foundation for riser modelling.The data analysis revealed a wealth of information on riser-wave-induced, vortex-induced (VIV) and heave-induced vibration response. The JIP determined that industry-standard analysis methods

Luva-flowlines heading for the field on board the Seven Oceans (Photo: Statoil)

Statoil: High Activity in Deep Waters

to good weather luck! “We split the most weather-sensitive operations into sub-operations and consequently we did not have to wait for long weather windows to carry out the operations,” she explains. This is the first time Statoil uses BuBi pipes, which consist of liner pipes and steel catenary risers for corrosion protection. At such depths it is namely possible to use rigid risers, which also cost less than flexible risers. During two weeks in June the spoolers were also installed. Normand Oceanic did the job perfectly and ahead of schedule. “During this operation we did not have

Photo courtesy of Trelleborg

Trelleborg Launches Subsea Vibration Suppression System

Lite system, not only eases installation but provides added resilience and load bearing capacity, including stinger installation loads. Jonathan Fox, Senior Product Development Engineer for Trelleborg’s offshore operation, said: “Pipelines unsupported over free spans, such as steel catenary risers and rigid steel flowlines, are prone to VIV fatigue, which can lead to serious issues such as pipe girth weld failure or premature pipe malfunction. To combat this, the Tri-Strake Combi comprises interlocking moldings, with three-start helical strakes.” Trelleborg utilized its vast

 Marlim is the fifth field in the world that will utilize FMC’s subsea separation technologies.  Tore Halvorsen SVP, FMC’s Global  Subsea Production Systems. (Photo: FMC Technologies)

Brazil Offshore: Petrobras & Subsea Engineering

project is a US$ 1billion contract awarded to Subsea 7 in 2011 by Petrobras and to date is the largest EPIC-SURF contract awarded in Brazil. The project scope includes the subsea engineering and the subsea installation of four decoupled riser systems featuring large submerged buoys supporting 27 steel catenary risers. The engineering and project management work is ongoing at Subsea 7’s offices in Rio de Janeiro. The SCRs are being reel-laid by the Seven Oceans vessel and hooked-up to the subsea buoys. The production and water injection lines are constructed predominantly from Mechanical Lined Pipe

Photo: BMT

BMT Strain Measurement Awarded Patent

BMT Scientific Marine Services (BMT), a subsidiary of BMT Group Ltd, has been granted a patent for its strain measurement system and unique attachment scheme that can be integrated into the insulation layer on ultra-deep water Steel Catenary Risers (SCRs). U.S. Patent No. 7,891,254 recognizes the device and method, invented by BMT’s riser engineers, that monitors strain on steel pipes with reduced or eliminated disruption of the insulation layer that covers the pipe. The attachment scheme is less intrusive than previous strain monitoring solutions.       

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