'Oil pump, Osage County, Oklahoma'

'Oil pump, Osage County, Oklahoma'

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Credit: JIM STEINBERG/SCIENCE PHOTO LIBRARY

Caption: The oil pump, known as a jack pump or a ''nodding donkey'', draws oil out of the ground through a series of non-return valves (not seen here). Newly-drilled oil wells ofen 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 to bring oil out at an economic rate. Even using jack pumps, generally only 30-50 percent of the oil can be extracted.

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Keywords: drill, drilling, drills, energy, fossil fuel, fossil fuels, fuels, gas, industrial, industries, industry, jack pump, jack pumps, natural gas, nodding donkey, nodding donkeys, non-return valve, non-return valves, oil, oil and gas, oil drill, oil drills, oil platform, oil platforms, oil production, oil pump, oil pumps, oil well, oil wellsoil drill, platform, pump, pumps, technologies, technology, valve, valves

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