Venezuela's oil is also of poorer quality than its Saudi equivalent. Its sour, heavy crude is difficult to extract and refine, while its high sulphur content makes it corrosive to pipelines. A resurgence of Venezuela's industry could pose problems for Canada, which produces similarly viscous oil and exports much of it to the US, but analysts reckon the risk is minor.
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Израиль нанес удар по Ирану09:28
The success of the test means project leaders are considering scrapping plans to flood 900 acres (364 hectares) of farmland in Gloucestershire, which was initially proposed to provide a compensating habitat for fish.