Liquid Nitrogen will do the trick. A good friend living in Australia, that's an expert on these Oils Well, tells me that he sent a recommendation almost 3 weeks ago to BP, suggesting that they use Liquid Nitrogen. The reason is that Crude Oil has a lot of coagulants and other particles that freeze on contact with Liquid Nitrogen. Once the freezing slows and then stops the flow, a more permanent solution can be affixed.