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Archive for the ‘rigs-to-reefs’ Category

A mile offshore during the big year-end swell (map below). Rigs-to-Rides!

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“Under the sea, under the sea, darling it’s better down where it’s wetter, take it from me”

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BSEE’s Facility Infrastructure Dashboard is a useful tool for tracking decommissioning activity in the Gulf of Mexico. A few numbers from the dashboard:

  • Current structure count:1438 (Per BSEE’s platform structures online query, the number of non-removed structures is 1554. The reason for the discrepancy is unclear; perhaps the dashboard number is more current.)
  • Structures with decom application submittal: 291
  • Total structures on terminated leases: 318
  • Structures on terminated leases with decom application submittal: 196

Planned disposition of the 291 pending removals (25% of the structures to be reefed):

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Guardian: Juvenile rockfish seen on an oil platform off the coast of Santa Barbara. For the scientists who study them, preserving these accidental marine ecosystems has become a moral issue. Photograph: Scott Gietler

Excellent Guardian article featuring my former colleague Dr. Ann Bull and Dr. Milton Love from the University of California at Santa Barbara.

According to a 2014 study they (Bull and Love) co-authored, the rigs were some of the most “productive” ocean habitats in the world, a term that refers to biomass – or number of fish and how much space they take up – per unit area. The research showed the rigs to be about 27 times more productive than the natural rocky reefs in California.

Guardian

More on decommissioning platforms offshore California.

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USS Oriskany (CV-34) holds the distinction of being the final Essex-class aircraft carrier ever completed. Instead of being decommissioned and scrapped, the ship was intentionally sunk approximately 25 miles south of Pensacola, Florida. This unique decision transformed the USS Oriskany into the largest ship ever used to create an artificial reef. Due to this extraordinary use, the carrier has earned the affectionate nickname “The Great Carrier Reef.” from Military Tactics

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See the Block Island Wind Farm’s reef environment in the BOEM video below.

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This CBC story, which includes excellent video interviews, was brought to my attention by Newfoundlander Howard Pike, an engineer and offshore safety leader.

Rigs-to-Removal (carbon)?

We know a lot about Rigs-to-Reefs, and the importance of active and reefed platforms in providing the habitat, shelter, and food that is necessary to increase biodiversity and productivity. However, the carbon reduction potential of artificial reefs has received little attention.

The linked CBC story is particularly interesting in that it includes interviews with artificial reef researchers who are assessing the carbon capture aspects. To date the results are encouraging:

As for the impact on climate change, the researchers say they have found some evidence that an artificial reef could hold more carbon compared to a natural reef.

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A new addition to our Rigs-to-Reefs+++ page courtesy of MaritimePhoto.

“Blue Marlin” – sea based X-Band radar on board a heavy lift and transport vessel
Photo: U.S. Navy / Journalist 2nd Class Ryan C. McGinley

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The 23 platforms in Federal waters offshore California are from 33 to 55 years old. Most are no longer producing and 8 are on terminated leases. Some of the platforms are massive structures in water depths up to 1200′ (list of platforms and map below).

BOEM’s draft programmatic EIS evaluates 4 decommissioning alternatives, none of which appear to be workable for a combination of economic, environmental, and legal reasons:

  • Alternative 1 involves the complete removal of platforms and pipelines. This alternative is cost prohibitive and environmentally unfavorable.
  • Alternatives 2 and 3 evaluate prudent and environmentally responsible partial removal options. Unfortunately, partial removal and reefing are not feasible under the California Resources Legacy Act (AB 2503). This legislation holds the donating company perpetually liable for any damages associated with the reef structure. While not assuming any liability, the State nonetheless collects 80% of the savings (reefing vs. complete removal). As a result, it’s no surprise that no company has applied to participate in the State’s program.
  • Alternative 4 calls for leaving platforms and pipelines in place after emptying tanks and flushing pipelines. This “no action” baseline alternative violates the lease agreement and 30 CFR 250.1725, and would only be permissible if an alternate use was approved for the platforms per 30 CFR Part 585.
  • The EIS, with minimal discussion and no supporting data, rules out alternate uses at any of the 23 platforms. This exclusion would seem to be premature given the win-win-win opportunities for industry, government (Federal, State, and local), and academia. These include deferred decommissioning liabilities, a wide range of research opportunities, security and defense applications, weather observation and climate studies, maritime communications support, education programs, marine seismicity studies, and hydrokinetic energy projects. With proper maintenance, platforms can continue to provide social benefits long after all wells are plugged and production equipment is removed. However, once removed, replacement costs would be prohibitive.
  • Lastly, the EIS avoids the thorny financial responsibility issues that will complicate decommissioning decisions. Note the questions raised in the “troubling case of platforms Hogan and Houchin.
  • Those wishing to comment on the draft EIS should follow the posted instructions.

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GUILDFORD, UK — Alpha Petroleum Resources, Energean UK and Orsted Hornsea Project Four will consider repurposing the Wenlock gas platform in the UK southern North Sea, which is nearing the end of its productive life.

One possibility is to reuse the facility as an artificial nesting site to offset the impact on certain bird species of offshore wind developments in the area.

Black-legged kittiwakes have set up nests on various North Sea platforms, according to Orsted’s recent surveys. Repurposing an existing platform as an artificial nesting structure is seen as an alternative to building a new artificial nesting structure to support the local development of the Hornsea Four offshore wind farm.

Offshore Magazine

See our Rigs-to-Reefs+++ page!

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