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DEEP WATER HORIZON (WHAT HAPPENED (High-Pressure methane gas at the bottom…
DEEP WATER HORIZON
WHAT HAPPENED
High-Pressure methane gas at the bottom of the oil well rose up through the riser of the drill and into the rig where it ignited and exploded. (Lilley S, 2015)
11 workers died (Lilley S, 2015)
4.9 millions barrels worth of oil spilled into the Atlantic (Lilley S, 2015)
The offshore oil rig burned for 36 hours and oil leaked into the sea for 87 days. (Lilley S, 2015)
$42.2 billion in damages (Lilley S, 2015)
WHY IT HAPPENED
Two workers on the rig were discussing how to perform a negative pressure test and how the data should be interpreted. There is no company or industry standard for this. (Lilley S, 2015)
data was misinterpreted (Lilley S, 2015)
While replacing the drilling mud in the oil well with seawater, oil had begun to flow from the bottom of the well and the flow had increased. (Lilley S, 2015)
corrective action was not taken because workers were unaware of the problem (Lilley S, 2015)
this is because the data from the negative pressure test was misinterpreted (Lilley S, 2015)
the pressure imbalance allowed the methane gas to expand up the degasser and into the cabin where it exploded (Lilley S, 2015)
Multiple operations were happening at the same time to seal off the well. (Lilley S, 2015)
With so much going on the crew was distracted from monitoring instrument readings (Lilley S, 2015)
A cement cap for the oil well was being prepared to seal the well (Lilley S, 2015)
Drilling mud from the well was being offloaded to another vessel (Lilley S, 2015)
tension on drilling risers was being eased (Lilley S, 2015)
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REFERENCESLilley, S 2015, Lessons from Macondo, viewed 4 October 2017, https://nsc.nasa.gov/SFCS/SystemFailureCaseStudy/Details/153Maksoud, J 2002, Monitoring system reduces rig downtime, viewed 5 October 2017, http://www.offshore-mag.com/articles/print/volume-62/issue-11/news/general-interest/monitoring-system-reduces-rig-downtime.htmlKing, L 2010, BP oil spill ‘slows’ but serious IT failures come to surface, viewed 5 October 2017, https://www.computerworlduk.com/infrastructure/bp-oil-spill-slows-but-serious-it-failures-come-to-surface-20481/King, L 2010, Deepwater Horizon modelling software showed BP cement conditions unstable, viewed 4 October 2017, https://www.computerworlduk.com/applications/deepwater-horizon-modelling-software-showed-bp-cement-conditions-unstable-3248321/