Of these rigs, 23,500 are permanently abandoned, and 3,500 are only “temporarily abandoned.” Companies that plan to leave a well temporarily abandoned have a year to submit plans for permanent sealing. It came as no surprise to POGO, after our decade-long struggle with the Minerals Management Service (MMS), that the AP report found that this “rule is routinely circumvented, and that more than 1,000 wells have lingered in that unfinished condition for more than a decade. About three-quarters of temporarily abandoned wells have been left in that status for more than a year.”
Despite evidence that these abandoned and temporarily abandoned wells are at risk of leaking at any time (as geological conditions shift and cement deteriorates) the plugged wells in federal waters are also often ignored. States, especially California and Texas, have had to reseal a number of wells for environmental and safety purposes. The same wells in federal water would have been left unseen, their cracks and leaks hidden deep under water and paperwork.
http://pogoblog.typepad.com/pogo/2010/08/no-one-paying-attention-to-27000-abandoned-oil-rigs-in-the-gulf.html As a forceful reminder of the potential harm, the well beneath BP's Deepwater Horizon rig was being sealed with cement for temporary abandonment when it blew April 20, leading to one of the worst environmental disasters in the nation's history. BP alone has abandoned about 600 wells in the Gulf, according to government data.
There's ample reason for worry about all permanently and temporarily abandoned wells -- history shows that at least on land, they often leak. Wells are sealed underwater much as they are on land. And wells on land and in water face similar risk of failure. Plus, records reviewed by the AP show that some offshore wells have failed.
Asked in multiple requests over several weeks how often abandoned wells have failed, the U.S. Environmental Protection Agency acknowledged Tuesday -- as this story was being released -- that it has had to deal with leaks at abandoned wells in shallow state waters of Louisiana and Texas. The U.S. Bureau of Ocean Energy Management, Regulation and Enforcement -- which oversees wells in federal waters -- also acknowledged Tuesday that it has dealt with "a few" failed abandoned wells farther out in the Gulf. But the information was released only through the public affairs offices and neither agency provided experts for follow-up.
Read more:
http://www.foxnews.com/us/2010/07/07/gulf-awash-abandoned-oil-gas-wells/#ixzz1a73YrqVG