Vol. 34 No. 15 31 March 2011

What Caused the Blowout Preventer to Fail?

Det Norske Veritas (DNV) recently released a lengthy Electronic control pods are used to communicate report detailing the company’s forensic examination with the control panel on the rig and then activate of the blowout preventer solenoids that, in turn, operate “various hydraulic (BOP), the failed “last line of defense” against the circuits and mechanical components on the blowout that occurred on 20 April 2010 at BP plc’s BOP Stack.” Macondo/MC252 well (see OSIR, 29 April 2010 and subsequent issues). The forensic investigation of the On the evening of 20 April 2010, the upper annular BOP is only a small part of the Joint Investigation (UA) of the Macondo/MC252 well was closed as (JI) of the event by the US Bureau of Ocean part of a series of two negative pressure tests. About Energy Management, Regulation and Enforcement 30 minutes after completing the second test, well (BOEMRE) and the US Coast Guard (USCG). An fluids started spilling onto the rig floor. The first additional report from the JI regarding the BOP is explosion is believed to have occurred at 21:49; the expected to be released within the next month; a Emergency Disconnect Sequence (EDS) activated full investigative report, addressing other aspects of from the bridge was noted at 21:56. It appears that the blowout, including the loss of 11 rig workers, is sometime between test completion and the activation of anticipated to be released later this summer. the EDS, the upper VBRs were closed and locked  an action consistent with well control procedures. DNV’s findings appear to at least partially vindicate well operator BP and Ltd., the company A section of drill pipe containing a tool joint (the that owned and maintained the BOP. According to high-strength threaded end of the drill pipe section) DNV’s analysis, which focuses solely on the operation was caught between the UA and the upper VBRs, and of the BOP, the failure of the BOP may be distilled DNV believes that “forces from the flow of the well” into one sentence: “The primary cause of failure was caused it to buckle, forcing it to one side of the well identified as the BSRs [blind shear rams] failing to bore just above the BSRs. Because the drill pipe was close completely and seal the well due to a portion of positioned off the center of the BSRs, the rams were drill pipe becoming trapped between the ram blocks.” unable to shear the pipe as intended, and thus jammed partially open. DNV found no apparent mechanical The BOP stack, which was built by Cameron failures of the BOP due to inadequate maintenance. International, consisted of several systems: a Lower Marine Riser Package (LMRP) containing Because the buckling of the drill pipe likely occurred two annular preventers and two control pods, plus at the time of loss of well control, it appears that the five sets of rams, including blind shear rams (BSRs), BOP failed because it did not function as intended, casing shear rams (CSRs), upper variable bore despite essentially functioning as designed. Shearing rams (VBRs), plus middle VBRs and lower VBRs. the drill pipe by engaging the CSRs on 29 April 2010 Rams are large steel jaws that are designed to either may also have increased flow from the well. close over an open hole or shear drill pipes to cut off the flow from a well. The annular preventers This is not to say that the analysis found no other have a rubber sealing element that is capable of issues in well control operations related to the BOP. sealing the annulus between the drill pipe or drill DNV offers eight recommendations for industry, as collar; if no part of the drill stem is in the bore, the well as a long list of suggestions for further testing. annular blowout preventer closes on the open hole. Recommendations include: oil spill INTELLIGENCE REPORT

1. Further study of elastic buckling, and the effects 7. Study the effectiveness of intervention using of flow and constraints on “tubulars” present Remotely Operated Vehicles (ROVs), and their within BOPs; ability to be mobilized in an emergency; and

2. Study of shear blade surfaces to ensure their abil- 8. Institute industry performance requirements for ity to function as intended, regardless of the posi- back-up control systems equivalent to those for tion of the pipes within the well bore; primary control systems.

3. Study, review, and revision of well control prac- Additional public hearings focusing on the forensic tices to identify conditions under which common examination of the BOP will be held by the JI during procedures (e.g., closing annulars or VBRs) might the week of 4 April 2011 in Metairie, (USA). adversely affect regaining well control; For more information, see www. 4. Review and revision of testing requirements to ensure deepwaterinvestigation.com/external/content/ that back-up controls are functioning as intended; document/3043/1047291/1/DNV%20Report%20 EP030842%20for%20BOEMRE%20Volume%20I. 5. Include redundancies in back-up controls to pre- pdf; www.deepwaterinvestigation.com/external/ clude common mode failure; content/document/3043/1047295/1/DNV%20 BOP%20report%20-%20Vol%202%20(2).pdf; 6. Study and implement industry requirements to www.dnv.com/press_area/press_releases/2011/ ensure the confirmation of the functionality of dnvreportondeepwaterhorizonbopconcluded.asp; and components like rams, annulars, and valves in the www.boemre.gov/ooc/press/2011/press0322c.htm. case of an emergency; Crescent City Cleans Up

A Unified Command operation to mitigate pollution debris and sunken ships to prevent further petroleum following the Japan earthquake-triggered tsunami is spillage and clean up the oil that has already been underway in the small community of Crescent City, released as quickly and safely as possible, so the city California (USA). According to eye witnesses, the can begin to rebuild the harbor. nearly 7-foot (over 2-meter) tsunami waves “crushed” boats in the harbor and destroyed docks. At least Responders include the US Coast Guard, the California 47 boats were damaged and another 15 sank as a Department of Fish and Game, the Crescent City result of the 11 March 2011 tsunami. Docks and Harbor District, two dive teams, several oil spill response moorings were also severely damaged. Damaged and organizations, and contractors. The effort is being sunken vessels spilled oil into the city’s inner basin funded by the federal Oil Spill Liability Trust Fund, harbor. The Unified Command’s goal is to remove which currently carries a ceiling of US $2.75 million.

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Copyright © 2011 CCH Incorporated

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Page 2 For subscriptions call 1-800-638-8437 31 March 2011 oil spill INTELLIGENCE REPORT

To date, 1,428 gallons (34 barrels) of petroleum Crescent City, a small fishing village that sits near products have been removed from the harbor, the border of California and Oregon (USA), is no and over 1,250 cubic yards (960 cubic meters) of stranger to tsunami damage. In 1964, a deadly debris have been hauled away from the inner boat tsunami killed 11 people and destroyed hundreds basin. A heavy-lift crane barge was brought in of homes and businesses. In 2006, another tsunami from San Francisco (California) to begin removing caused approximately $10 million in damages to the sunken and damaged boats and debris. More than same harbor. 1,300 feet (400 meters) of containment boom have been deployed. So far, there have been no reports For more information, see www.piersystem.com/ of oiled wildlife. Many of the harbor’s docks will go/doc/3919/1050387/Crescent-City-Tsunami- remain closed to the public throughout the cleanup Response-Update-16; www.piersystem.com/go/ and rebuilding process, although the harbor has been doc/3919/1049743/; www.piersystem.com/go/ reopened to vessel traffic. Fishing resumed in the doc/3919/1047531/; and http://articles.latimes. area within days, and crab boats have already brought com/2011/mar/11/local/la-me-crescent-city-california- in their first catches of the season. 20110311. Anglo-Suisse Joins Gulf Cleanup Efforts

Anglo-Suisse Offshore Partners, LLC, a Houston, be the case, the responsible thing to do was Texas (USA)-based operator in the , mobilize.” As responsible party, Anglo-Suisse has joined the Unified Command in cleaning up the would be liable for costs associated with the Louisiana (USA) coastline impacted by crude oil last cleanup. As of the latest update by the USCG, week (see OSIR, 24 March 2011). The spill, for which assets deployed for cleanup and recovery included the US Coast Guard (USCG) has not yet released approximately 8,400 feet (2,560 meters) of an estimated volume, was initially reported Sunday, containment boom, two MARCO-brand skimmers, 20 March 2011, and is believed to have impacted five barge boats, and four drum skimmers. a total of 0.25 to 0.5 miles (0.4–0.8 kilometers) of coastline across a 30-mile (48-kilometer) area. Despite the results of the sample analyses, some The USCG named Anglo-Suisse as the responsible mysteries still surround the spill. The West Delta 117 party in connection with the spill, based on the is located about 30 miles (48 kilometers) from chemical fingerprint of oil collected and analyzed by Grand Isle, and a 23 March 2011 USCG update on the USCG and Louisiana State University (Baton the spill stated: “The [USCG] and [US] National Rouge, Louisiana). The results of those analyses Oceanic and Atmospheric Administration Scientific matched samples collected from Anglo-Suisse’s West Support Coordinator confirmed there was no oil at Delta 117 well with samples collected from both or in the vicinity of West Delta 117 site. The over Elmer Island and Grand Isle, Louisiana. flight searched east of Grand Isle to the eastern end of Timbalier Island and 12 miles [19 kilometers] While Anglo-Suisse had filed several incident reports offshore, still finding no oil.” Anglo-Suisse, the related to its activities while shutting in the West USCG, and the US Department of the Interior’s Delta 177 well, the company expressed “surprise” at Bureau of Ocean Energy Management, Regulation the USCG’s suggestion that the less-than-5-gallons and Enforcement (BOEMRE) are continuing to of oil they believed to have been released could investigate the cause of the spill. be responsible for the recent fouling of Louisiana coastlines. The company is performing its own For more information, see www.d8externalaffairs. analysis of samples from the well and the affected com/go/doc/425/455751/; www.nola.com/news/gulf- coastal areas. John Sherwood, CEO of Anglo- oil-spill/index.ssf/2011/03/houston_company_accepts_ Suisse, said, “We do not believe the spill along respon.html; and http://online.wsj.com/article/SB1000 the coast is the result of our operations, however, 1424052748704604704576221214051522074.html. when the [USCG] informed us that this might

Page 3 For subscriptions call 1-800-638-8437 31 March 2011 oil spill INTELLIGENCE REPORT ExxonMobil Gets Favorable Ruling

A ruling earlier this month, in the US District Court filed earlier by government officials, saying Steiner for the District of Alaska, gave ExxonMobil a victory doesn’t have standing to force a resolution. in the latest round of an ongoing battle over damages related to the 1989 Exxon Valdez spill in Prince The governments who filed the initial claim William Sound, Alaska (USA). Over 11 million haven’t tried to collect the money themselves. gallons (262,000 barrels) of crude oil poured into the Their lawyers indicated that they are waiting for Sound, when the Exxon Valdez hit a reef. A punitive the completion of studies regarding the oil that damages case involving the spill was finally resolved remains and the effectiveness of cleanup techniques in 2009 (see OSIR, 18 June 2009, 2 July 2009). before proceeding. Judge Holland wrote, “The court urges the governments and their trustees to The current case in question involves a US $92 million proceed with all possible speed to complete studies claim, which was filed by state and federal governments, that are under way and any necessary evaluation in 2006, arguing for additional cleanup funds because which they may require.” the oil is degrading very slowly and continues to pose a threat to wildlife. In a 1991 civil settlement, ExxonMobil claims that only very small amounts of ExxonMobil paid $900 million in restitution, but oil remain. In a filing to Judge Holland, the oil giant that settlement contained a “reopener” clause that said, “Thus, ExxonMobil has no further obligations” allowed state and federal governments to claim up regarding the Exxon Valdez spill. to $100 million later, if additional damages came to light. On 7 March 2011, Judge H. Russel Holland For more information, see http://blog.seattlepi. ruled against a motion filed by former University com/seattlepolitics/2011/03/02/exxon-no-further- of Alaska professor Rick Steiner that sought to obligations-for-spill/ and http://news.yahoo.com/s/ force ExxonMobil into paying the $92 million claim ap/20110308/ap_on_re_us/us_exxon_valdez. National Institutes of Health Launch Gulf Health Study The National Institute of Environmental Health were involved in cleanup operations. Researchers are Sciences (NIEGS), one of the US National Institutes hoping to enroll 55,000 people, including a control of Health (NIH), has started enrolling participants group of those trained in cleanup operations, but not in its Gulf Long-term Follow-up study (GuLF actively involved in the cleanup process. STUDY). NIH is providing the bulk of the funding for the study. BP plc is providing a small amount of All participants will be asked to complete a funding, but will not be involved in the research. 30-minute telephone interview, and to update their contact information annually. About one-half of “Over the last 50 years, there have been 40 known the participants will be invited to participate in a [large] oil spills around the world. Only eight of these home visit, at which time they will be interviewed spills have been studied for human health effects,” a second time; samples of blood, urine, and house said Dale Sandler, PhD, Chief of the Epidemiology dust will be collected; and some additional clinical Branch at NIEHS and principal investigator of the tests will be performed. The results of these GuLF STUDY. “The goal of the GuLF STUDY is analyses will be released to the participants and, if to help us learn if oil spills and exposure to crude oil needed, they will be referred to a doctor or clinic and dispersants affect physical and mental health.” for treatment. Those individuals participating in the home visit will also be asked to complete brief The GuLF STUDY will focus on the possible impacts follow-up questionnaires every two years. The study to the health of workers and volunteers involved is expected to run for a total of ten years. with the cleanup in the aftermath of the 20 April 2010 explosion and spill at BP’s Macondo/MC252 For more information, or to enroll in the GuLF well in the Gulf of Mexico (see OSIR, 29 April 2010 STUDY, call toll free: +1 855 NIH GULF and subsequent issues). Around 130,000 workers (+1 855 644 4853), or see www.nihgulfstudy.org.

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