BP Deepwater Horizon Macondo Blowout: Gulf of Mexico
This paper examines the BP Macondo well blowout disaster in the Gulf of Mexico, beginning with an overview of the drilling operation's background, water depth, rig type, and reservoir characteristics. It identifies the key partners, shareholders, suppliers, and contractors involved — including BP, Transocean, Halliburton, and Cameron International — and traces a detailed chronological timeline of events from the initial exploration plan in 2009 through the explosion on April 20, 2010, and the 83-day series of failed containment efforts that followed. The paper concludes that BP was aware of critical equipment failures and operational risks but failed to adequately address them, resulting in the largest offshore oil spill in history.
- Overview of the Macondo Well Operation: Location, depth, rig type, and explosion summary
- Partners, Shareholders, and Key Contractors: Ownership percentages and contractor roles
- Timeline of Events Leading to the Blowout: Chronological failures from 2009 to April 2010
- Containment Attempts Over 83 Days: Ten successive containment methods and their outcomes
- Summary and Conclusion: BP's known risks and organizational accountability
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What makes this paper effective
- The chronological timeline section is particularly strong, organizing a complex chain of technical and regulatory failures into a clear, event-by-event sequence that makes causation easy to follow.
- The numbered list of 10 containment attempts efficiently conveys the scope of BP's response efforts while making clear that most approaches failed, reinforcing the paper's central argument about organizational risk-taking.
- The identification of specific contractors, their roles, and the materials they used (e.g., nitrogen-foamed cement) grounds the analysis in concrete technical detail rather than vague generalization.
Key academic technique demonstrated
This paper demonstrates the use of a structured case study format — organizing background, stakeholders, chronology, and outcome into discrete sections — to build toward an evidence-based conclusion. Rather than stating the conclusion first, the writer allows the accumulated timeline evidence to support the final judgment that BP knowingly accepted unacceptable operational risk.
Structure breakdown
The paper opens with a brief operational overview establishing setting and scale, then moves through two preparatory sections identifying ownership and contractors. The core of the paper is the detailed event timeline, which transitions directly into the numbered list of containment attempts drawn from the Deepwater Horizon Study Group report. A concise conclusion synthesizes the evidence into a clear accountability claim. This structure suits case study writing at the undergraduate level.
Overview of the Macondo Well Operation
On April 22, 2010, an explosion ripped through the Deepwater Horizon drilling rig at the Macondo Exploration Well, located in Mississippi Canyon Block 252, approximately 41 miles off the coast of Louisiana. A fire burned for about 36 hours before a second blast sank the rig. The well's blowout preventer failed to activate, resulting in the largest oil leak in the history of offshore drilling (Gulf, Oil, and Gas, 2011).
The Macondo Exploration Well/Canyon 252 Block is located in the U.S. sector of the Gulf of Mexico. The water depth at the site is approximately 5,000 feet, and the well drilling depth reached approximately 18,000 feet (5,500 m) below sea level. Prior to the disaster, plans indicated that the well would be "plugged and suspended for subsequent completion as a subsea producer" (Gulf, Oil, and Gas, 2011).
Partners, Shareholders, and Key Contractors
The Macondo well operation involved three principal ownership partners. BP Plc held a 65% share as the operator of Canyon 252 Block. Anadarko Petroleum Corporation held a 25% share, and Mitsui Oil Exploration Co., Ltd. held the remaining 10% (Gulf, Oil, and Gas, 2011).
Several major suppliers, contractors, and service providers were involved in the operation:
Halliburton Co. performed the cementing work on the Macondo Exploration Well. A special nitrogen-foamed cement was used, which is more difficult to handle than standard cement. A cement bond log is used to document and evaluate the integrity of cement work performed on an oil well.
Plant Performance Services (P2S), a wholly owned subsidiary of Fluor Corporation, was selected by BP to execute two contracts supporting Gulf Coast clean-up efforts.
Transocean was the provider and operator of the Deepwater Horizon drilling rig — a floating semi-submersible drilling unit, ultra-deepwater, dynamically positioned, and column-stabilized. The rig cost $560 million and was built by Hyundai Heavy Industries.
BP Plc served as the operator of Canyon 252 Block.
Cameron International manufactured and supplied the blowout preventer (BOP) for the Macondo Exploration Well on Canyon 252 Block (Gulf, Oil, and Gas, 2011).
Timeline of Events Leading to the Blowout
On February 28, 2009, BP filed a 52-page exploration and environmental impact plan for the Macondo well. The plan stated it was "unlikely that an accidental surface or subsurface oil spill would occur from the proposed activities." It further noted that, in the event of an accident, the well's distance of 48 miles (77 km) from shore and the response capabilities that would be deployed meant no significant adverse impacts were expected. The Department of the Interior subsequently exempted BP's Gulf of Mexico drilling operation from a detailed environmental impact study, concluding that a massive oil spill was unlikely (Gulf, Oil, and Gas, 2011).
On June 22, 2009, BP engineers issued a warning that the metal casing for the blowout preventer might collapse under high pressure (Gulf, Oil, and Gas, 2011). On October 7, 2009, BP began drilling the Macondo well using the Marianas rig. The Marianas rig was damaged by Hurricane Ida on November 9, 2009, and was subsequently replaced by the Transocean Deepwater Horizon drilling rig (Gulf, Oil, and Gas, 2011).
Drilling recommenced on the Macondo well using the Deepwater Horizon rig on February 15, 2010. The rig experienced multiple problems during this period, including drilling mud falling into the undersea oil formation, sudden gas releases, a pipe falling into the well, and at least three occasions on which the blowout preventer leaked fluid after an accident damaged a gasket (Gulf, Oil, and Gas, 2011).
On April 9, 2010, BP drilled the last section of the wellbore to 18,360 feet below sea level, but the last 1,192 feet required casing. Halliburton recommended a liner/tieback casing that would provide four redundant barriers to flow. BP instead chose a single liner with fewer barriers, which was faster to install and less expensive (Gulf, Oil, and Gas, 2011).
On April 14, 2010, oil accumulation was discovered in the well, and Schlumberger flew a crew to the site to conduct a cement bond log to determine whether the cement had properly bonded to the casing and surrounding formations (Gulf, Oil, and Gas, 2011). By April 17, 2010, drilling was completed by the Deepwater Horizon and the well was being prepared for cementing so that another rig could retrieve the oil. BP was aware at this time that problems existed with the BOP, which was designed to shut off the well in the event of an emergency (Gulf, Oil, and Gas, 2011).
An explosion ripped through the drilling rig on April 20, 2010. On April 22, 2010, a second blast sank the rig. The blowout preventer did not activate, and an uncontrolled oil leak began. By April 25, BP had made plans to drill two relief wells — a primary and a backup — in the Canyon 252 Block. The primary relief well was designed to intersect with the blown-out Macondo well at approximately 18,000 feet beneath the water's surface, or 13,000 feet beneath the sea floor, and then be sealed with mud and cement. A second drilling rig, Transocean's Discoverer Enterprise, was en route to assist (Gulf, Oil, and Gas, 2011).
Work on the first relief well began on May 2, 2010, and was estimated to take approximately three months to complete. On May 5, 2010, BP began fabricating a dome-like containment device intended to divert oil at the wellhead on the seabed. The plan was to lower the dome over one of the leak sites and connect it by pipe to a specialist vessel at the surface (Gulf, Oil, and Gas, 2011). On May 7, a steel dome weighing approximately 100 tons was deployed. On May 16, work began on the second relief well. On May 17, large formations of gas hydrates — similar to ice crystals — clogged the dome, rendering it ineffective.
On May 26, 2010, BP initiated the "top kill" operation, injecting heavy drilling fluids through the blowout preventer on the seabed and down into the well in an attempt to stem the flow of oil and gas. BP also made the decision to move forward with deployment of the Lower Marine Riser Package (LMRP) Cap Containment System (Gulf, Oil, and Gas, 2011).
References
Calkins, L. B. (2012). BP seeks recovery of all Gulf spill costs from Halliburton. Bloomberg. Retrieved from http://www.bloomberg.com/news/2012-01-02/bp-seeks-recovery-of-at-least-20-billion-spill-damages-from-halliburton.html
Deepwater Horizon Study Group. (2011). Final report on the investigation of the Macondo well blowout. Retrieved from
Griggs, J. W. (2011). BP Gulf of Mexico oil spill. Energy Law Journal, 32(37). Retrieved from http://large.stanford.edu/courses/2011/ph240/mina1/docs/14_57_bp_gulf_of_mexico.pdf
Gulf, Oil, and Gas. (2011). Oil spill in the Gulf of Mexico — Special report. Retrieved from http://www.gulfoilandgas.com/webpro1/projects/3dreport.asp?id=102868
Global Research. (2012). BP's Macondo Gulf oil spill: The public was misled. There are THREE — not one — leaking wellheads. Retrieved from http://www.globalresearch.ca/bps-macondo-gulf-oil-spill-the-public-was-misled-there-are-three-not-one-leaking-wellheads/5310203
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