Oil pump

IMAGE NUMBER: 2A5518 LICENSE: RIGHTS MANAGED

Oil pump in the Los Angeles basin. Los Angeles, California. 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.

Credit: Lowell Georgia / Science Source

Model Release: No, but may not be necessary

File Size: up to 13.7" by 20.1" (at 300dpi)

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