Oil Spill

17th April 2024

What Happened? On April 20, 2010, an explosion occurred on the Deepwater Horizon drilling platform in the Gulf of Mexico. The explosion, which killed 11 men, caused the rig to sink and started a catastrophic oil leak from the well.

Deepwater Horizon oil spill, the largest marine oil spill in history, was caused by an April 20, 2010, explosion on the Deepwater Horizon oil rig—located in the Gulf of Mexico, approximately 41 miles (66 km) off the coast of Louisiana—and its subsequent sinking on April 22.

The Deepwater Horizon rig, owned and operated by offshore oil drilling company Transocean and leased by oil company BP, was situated in the Macondo oil prospect in the Mississippi Canyon, a valley in the continental shelf. The oil well over which it was positioned was located on the seabed 4,993 feet (1,522 meters) below the surface and extended approximately 18,000 feet (5,486 meters) into the rock. On the night of April 20, a surge of natural gas blasted through a concrete core recently installed by contractor Halliburton to seal the well for later use.



Once released by the fracture of the core, the natural gas traveled up the Deepwater rig’s riser to the platform, where it ignited, killing 11 workers and injuring 17. The rig capsized and sank on the morning of April 22, rupturing the riser, through which drilling mud had been injected to counteract the upward pressure of oil and natural gas. Without any opposing force, the oil began to discharge into the gulf. The volume of oil escaping the damaged well—originally estimated by BP to be about 1,000 barrels per day—was thought by U.S. government officials to have peaked at more than 60,000 barrels per day.

The petroleum that had leaked from the well before it was sealed formed a slick extending over more than 57,500 square miles (149,000 square km) of the Gulf of Mexico. To clean oil from the open water, 1.8 million gallons of dispersants—substances that emulsified the oil, thus allowing for easier metabolism by bacteria—were pumped directly into the leak and applied aerially to the slick. Booms to corral portions of the slick were deployed, and the contained oil was then siphoned off or burned. As oil began to contaminate Louisiana beaches in May, it was manually removed; more difficult to clean were the state’s marshes and estuaries, where the topography was knit together by delicate plant life.

This post is a part of the #BlogchatterAtoZ challenge.