According to a great article in the Canadian Star, underground tar sands operations have resulted in four separate oil spills that have been leaking over the last six weeks.
The spills have been on-going since May, with some 26,000 barrels of bitumen mixed with surface water having been removed, including over 4,500 barrels of bitumen.
The paper points out that the spills– although relatively small –cast doubt on the safety of underground extraction methods.
And in deed they do: if you think about BP’s catastrophic disaster in the Gulf – at least there was a traditional well-head that the company could plug. But no such thing exists for the tar sands.
The company responsible Canadian Natural Resources Limited uses an in situ or underground extraction method of extracting the oil, which is called “cyclic steam stimulation.”
This involves injecting thousands of gallons of boiling hot, high-pressure steam into deep underground reservoirs. This in turn liquefies the bitumen and creates cracks through which the bitumen flows. It is then pumped to the surface.
The problem is that it that the company has created fractures from the oil reservoir to the surface that they did not expect. Oil has been flowing to the surface at different sites.
The company has so far failed to stop the latest spill which has killed dozens of animals such as beavers and loons as well as contaminating a lake and local forest. The latest spill has contaminated at least 40 hectares.
The paper quotes one scientist saying that everybody in the company concerned and at the government “is freaking out about this. We don’t understand what happened. Nobody really understands how to stop it from leaking, or if they do they haven’t put the measures into place.”
The scientist is not the only one concerned. “This is a new kind of oil spill and there is no ‘off button,’ ” Keith Stewart, an energy analyst with Greenpeace who also teaches at the University of Toronto, tells the paper. “You can’t cap it like a conventional oil well or turn off a valve on a pipeline.”
He adds: “You are pressurizing the oil bed so hard that it’s no wonder that it blows out. This means that the oil will continue to leak until the well is no longer pressurized”. And that could be for months.
This problem could get more common as in situ tar sands extraction is expected to account for 40 per cent of Canada’s oil sands production by 2020.
Meanwhile, tomorrow, the UK Tar Sands Network, which is leading the anti-tar sands fight in the UK, will release a new info-graphic website that showcases two possible future energy scenarios for 2035: the one we are currently headed for which would result in runaway climate change; and one without fossil fuels.
Jess Worth, from the UK Tar Sands Network, said: “We’re standing at a crossroads. It’s time for humanity to make a choice. Do we sit back and allow fossil fuel companies and oil-friendly governments to dig, drill and frack us into a dark and dirty future? Or do we stand together with communities around the world to stop these extreme energy projects, and head down a different path?”
From tomorrow you can check out the new resource here.