A jack pump extracting oil, pump head in motion

A jack pump extracting oil, pump head in motion

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Caption: Oil pump. An oil pump, known as a jack pump or a "nodding donkey", showing it in motion. The pump draws oil out of the ground through a series of non-return valves (not shown here). Newly-drilled oil wells often contain oil at a high enough pressure to force the fluid out without needing to be pumped. As the oil is removed, the pressure falls. For a time, the pressure can be maintained by pumping water or air into the subterranean reservoir of oil. Eventually the pressure falls further and a jack pump is required bring oil out at an economic rate. Even using jack pumps, generally only 30-50 per cent of the oil can be extracted.

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Keywords: energy, fossil fuel, fuels, industry, jack pump, nodding donkey, oil, oil extraction, oil pump, oil well

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