Could BP's closing off the well create a hydraulic hammer?

Could BP's closing off the well create a hydraulic hammer?
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Answer :

answer:That is why they closed the valves off gradually, to allow the pressure to build up slowly. Also – this is not entirely hydraulic. There is a considerable amount of methane in the flow, which unlike the oil is compressed as the pressure builds up. The leaks that have been a cause of concern since they capped off the flow are from methane. Potentially, you have more of a blowout risk from the gas pressure than you do from the oil.
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