Rigs-to-Reefs (RTR) is the practice of converting decommissioned offshore oil and petroleum rigs into artificial reefs. Such biotic reefs have been created from oil rigs in the United States, Brunei and Malaysia.Brian Twomey, Artificial Reefs, CCOP/EPPM Workshop on End of Concession & Decommissioning, 12–14 June 2012. (PDF) In the United States, where the practice started and is most common, Rigs-to-Reefs is a nationwide program developed by the former Minerals Management Service (MMS), now Bureau of Safety and Environmental Enforcement (BSEE), of the U.S. Department of the Interior.
The program has been generally popular with fishers, the oil industry, and government regulators in the Gulf of Mexico, where offshore platforms develop into coral reefs, and as of September 2012, 420 former oil platforms, about 10 percent of decommissioned platforms, have been converted to permanent reefs.National Oceanic and Atmospheric Administration, Gulf decommissioning and Rigs-to-Reefs, FAQs , 2012.
Opposition in California has prevented a rigs-to-reefs program on the West Coast of the US.Joanna D. E. Athanassopoulos, James Stanwood Dalton, and Adam P. Fischer, Off Shore Oil Platform Decommissioning , M.S. Thesis, June 1999, University of California Santa Barbara. (PDF) Similarly, environmental opposition has prevented implementation of Rigs-to-Reefs in the North Sea.
Overview Inevitably, marine organisms attach themselves to the underwater portions of oil production platforms, transforming them into artificial reefs.
These platforms continue to function as long as the reservoirs underneath them provide oil at a profitable rate. At the end of their productive lives they must be decommissioned and removed (in the US within one year). An alternative to removal is to turn the rig into a reef through the Rigs-to-Reef (RTR) program. All coastal states in the US have such artificial reef programs in the interest of increasing ocean fisheries but not all participate in RTR.http://www.slc.ca.gov/Division_Pages/MRM/Rigs_to_Reef/Whitepaper.html State of California State and Lands Commission The rig's steel structures are stable and durable. They create shelter for marine life in open waters where there was none.
Note that production platforms are often called "rigs"; that terminology is used occasionally in this article—and indeed in the term Rigs-to-Reefs. Within the industry, "rig" refers to an apparatus with a derrick that can drill and service wells. (Most production platforms do not have such equipment installed.)
Process Once a rig stops producing at economic rates, the site is usually abandoned. In the United States, the Minerals Management Service (MMS) requires the operator to remove the rig within a year of abandonment (stopped production) and lease end. MMS supports and encourages RTR as an alternative to total removal. RTR recognizes that during a rig's productive years, significant marine life comes to live on and around its structure. RTR preserves much of that marine life and encourages further growth. The operator benefits by avoiding the substantial cost of removal. Cumulative costs of removal had reached an estimated $1 billion by the year 2000. The shape and complexity of the structure may lead to significant species diversity.
Decommissioning a platform Officially, decommissioning an oil rig is the act of removal according to regulatory requirements and includes flushing, plugging and cementing wells to make them safe. Decommissioning is complicated by factors such as cost, safety, operational duration, environmental issues, risk, experience, and historical relationship between operator and state.
As part of decommissioning, the operator must deal with the shell mound that collects on the bottom surrounding the rig. The mound forms on the pile of cuttings discharged from the original drilling operations, shells that have fallen from the platform's underwater structure, and material that has fallen and/or leaked from the platform, occasionally mixed with well seepage. Mounds can contain significant levels of toxic metals including, arsenic, cadmium, chromium, copper, nickel, PCBs, lead, zinc, and poly-nuclear hydrocarbons. Removing the rig structure does not eliminate the need to address the mound.
The method of decommissioning depends on water depth and structure typeSector Notebook Project; Office of Enforcement and Compliance Assurance, October 2000 and is a three-step process that includes planning, permitting, and implementation. A party other than the operator usually administers the process.
In Louisiana, costs as well as the risk involved are the primary factors in determining how to decommission rigs. If the savings are large enough, the operator typically chooses reefing and donates 1/2 the savings to maintain the reef. Decommissioning a shallow water rig typically costs $10–15 million so the amounts can be substantial.http://www.slc.ca.gov/Division_Pages/MRM/Rigs_to_Reef/Whitepaper.html CA.gov Rigs-to-Reefs Workshop The Louisiana Artificial Reef program from its inception through 1998 received roughly $9.7 million in donations and has not taken taxpayer money.
Methods of reefing
Severing the rig from the bottom using explosives is the easiest approach, but has the potential to harm marine life. This potential is greatly reduced if the explosives are all placed deep below the seafloor. Current requirements place the explosives a minimum of below the seafloor which eliminates the threat to all but the closest sea turtles. National Oceanographic and Atmospheric Administration (NOAA) National Marine Fisheries Service (NMFS) marine observers and helicopter surveys hours preceding the event keep most sea turtles away from the area. Alternatively, commercial divers can use mechanical and abrasive cutters, which preserves marine life, but places the divers at considerable risk.
Reefing involves one of four methods:
Tow and Place: Sever the structure from the sea floor and tow it to a state-approved location. Partial Removal: Remove the top portion of the submerged platform and either remove to the shore for salvage or place it on the sea floor nearby or at another site. Partial removal can result in a loss of the shell mound community and fish that live in the top section but the rest (the majority) of the habitat remains intact. Toppling: Toppling involves uses explosives to sever the base of the structure below the mud line in a matter such that it simply falls over. Toppling eliminates shallow and mid-ocean habitats. These portions of the rig are quickly occupied by other creatures. Augmentation and Integration: Augmentation and Integration involves adding additional structure to the reef site to enhance its value as a habitat and deliver additional ecosystem services.
United States Offshore drilling began in California in the late 1800s from piers built out over the ocean. The United States began extracting oil offshore in the early 20th century and the first offshore oil platform in the Gulf of Mexico was built in 1947 off the Louisiana coast. "Today over 4,500 offshore oil and gas platforms have been installed supplying 25% of the United States' production of natural gas and 10% of its oil."http://www.wlf.louisiana.gov/fishing/programs/habitat/artificialreef.cfm Louisiana Department of Wildlife and Fisheries
The US Congress passed the Outer Continental Shelf Lands Act (OCSLA) in 1953, to control leasing of exploration rights in the Outer Continental Shelf (OCS). The OCSLA did not contain any real environmental provisions associated with drilling and the 1969 Santa Barbara oil spill triggered the National Environmental Policy Act (NEPA), which required that every major federal action (i.e.: oil exploration on the OCS) required an Environmental Impact Statement (EIS). In 1982, The U.S. Department of the Interior created the Minerals Management Service (MMS) to monitor development on the Outer Continental Shelf. The MMS leases submerged federal lands and assesses the environmental effects of exploration and drilling (by issuing an EIS). In 1984 Congress passed the National Fishing Enhancement Act (NFEA) which provided the basis for artificial reef programs. The NFEA spawned the National Artificial Reef Plan of 1985. This plan cleared the way for government-endorsed artificial reef projects and subsequently the Minerals Management Services' Rigs-to-Reef program.
Following a number of hurricanes from 2004 to 2008, including Katrina, Ike, Ivan, and Rita, that damaged oil production platforms, offshore oil operators filed numerous applications to abandon unused platforms in place.Bureau of Ocean Energy Management, Rigs-toReefs program The federal government responded by placing a moratorium on Rigs-to-Reefs, and requiring unused platforms to be speedily decommissioned by removal. In June 2013, the BSEE lifted its moratorium on Rigs-to-Reefs, subject to Coast Guard determination that the structure would not pose a threat to navigation, and acceptance of ownership and liability by the state government.James A. Watson, "Interim policy document" , Bureau of Safety and Environmental Enforcement, 21 June 2013.
If the Rigs-to-Reefs option is expected to be less expensive than removal, the platform owner pays half the estimated savings to the state agency receiving the former platform.
Gulf of Mexico
The more than 4,500 oil production platforms in the US portion of the Gulf of Mexico are the largest concentration of offshore platforms in the world, having more offshore platforms than the rest of the world combined. The oil production platforms in the Gulf have also been called the largest artificial reef complex in the world.
In 1979, Exxon relocated their experimental subsea production system from offshore Louisiana to a permitted artificial reef site off Apalachicola, Florida. The first platform jacket was donated by Tenneco and towed from Louisiana to Pensacola, Florida.
By 2000, 151 platforms had been converted to permanent reefs. Of these, 90 were towed to new locations and 61 were abandoned in place. Louisiana had 94 of the platforms-turned reefs, Texas 50, Alabama 4, and Florida 3. Florida, which has a long-standing ban on offshore oil production, has requested and received a number of decommissioned oil platforms for creation of artificial reefs in Florida state waters.http://www.api.org/aboutoilgas/sectors/explore/rigstoreef.cfm API Energy: Rigs to Reef Programs Create Valuable Fish Habitat
Offshore California absence No oil platforms have been converted to artificial reefs in offshore California, the only other offshore oil-producing area in the contiguous 48 states. The California legislature passed a bill allowing conditional partial removal of oil platforms in 2010, and the measure was signed by Governor Arnold Schwarzenegger. A.B. 2503 "allows a platform owner or operator to design a 'partial removal' plan for a platform and to apply for permission to implement it". The plan requires the approval of three agencies: The Department of Fish and Game (DFG), The Department of Ocean Protection Council (OPC), and the California State Lands Commission.
As of 2013, no oil platforms have been converted to permanent reefs. A number of reasons have been cited for this, primarily the strength of the environmental movement in California, its antagonistic relationship with the oil industry, and its reluctance to support any measure that would financially benefit the offshore oil industry. Other differences include the smaller number of offshore platforms (27 off California, versus approximately 4,500 in the Gulf of Mexico), and the smaller portion of the California economy made up by oil and fishing.
Brunei Brunei has had a rigs-to-reefs policy since 1988. Offshore operator Shell Brunei Petroleum has towed numerous old platforms and jackets to two designated artificial reef areas located away from shipping lanes.
Malaysia