As previously posted (July 27, 2010), deep water had little to do with the well integrity problems and other contributing factors leading to the Macondo blowout. The Bly (BP) report further confirms this position.
Of the eight key findings in the Bly report (listed below), only number 4 could be considered to be more of a deepwater issue. The BOP failures may also have been influenced by deepwater factors. However, as previously noted, surface BOPs have a much higher failure rate than subsea stacks.
While the Montara blowout was in relatively shallow water, slight variations of findings 1 through 4 were the primary causes of that accident.
BP findings:
- The annulus cement barrier did not isolate the hydrocarbons.
- The shoe track barriers did not isolate the hydrocarbons.
- The negative-pressure test was accepted although well integrity had not been established.
- Influx was not recognized until hydrocarbons were in the riser.
- Well control response actions failed to regain control of the well.
- Diversion to the mud gas separator resulted in gas venting onto the rig.
- The fire and gas system did not prevent hydrocarbon ignition.
- The BOP emergency mode did not seal the well.
Bud's Offshore Energy (BOE) 