The oil and gas produced at offshore rigs normally moves via pipeline to onshore. Today's technologies on blowout preventers, SCADA data communication systems monitoring flow in vs. flow out of pipelines, pipeline pressures, etc. minimize releases in the event of a pipeline mishap.
Hurricane Ivan created a giant underwater mudslide that severed hundreds of such lines, it took over a year for boats with specialized equipment to locate, then reconnect, all these lines. Anyone who watched the documentary series 'Oil, Rigs, and Sweat' should have seen glimpses of this.
Look at how much Gulf of Mexico production temporarily ceased due to Ivan, then compare to no oil found released to the environment.
Hurricane Ivan Oil & Gas Facilities Remediation Solution
Producers, government study lessons from Hurricane Ivan
No reports of oil slicks, oily beaches, etc. from Ivan that I recall - mute testament to how well these systems work today.
I remeber as a teenager in South Texas when Ixtoc 1 occurred. Blatant stupidity on not capping the well outside of US waters in the Bay of campeche. Bad damage in the Laguna Madre from oil intrusion - this has never happened since. I'll bet scubapro50 remebers this too. Containment booms could have been put in place but weren't.
Ixtoc I - Wikipedia, the free encyclopedia
Imported oil, brought to us via tankers and supertankers, are far more vulnarable to spills, and I don't remeber tar on Padre Island beaches until the rapid rampup of imported oil in the 70's. There have been less than scrupulously operated ships over the years with a 'catch me if you can' attitude toward the residues left in the tankers after offloading.
#07-171: 03-21-07 Tanker Company Sentenced for Concealing Deliberate Vessel Pollution
More domestic production vs. continued or ever increasing imports reduces the risk significantly, easily seen in these records.