Midlothian's 100 Objects - D'Arcy Farm oil wells
Few oil wells flow from natural pressures. Most require secondary means of removing the oil.
The plant shown is the most common of several methods. A walking beam is operated like a seesaw, raising and lowering a plunger-type pump set near the bottom of the well.
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Hide AdThe sucker rods are the rods between the walking beam and the pump seen on the right. Note the counterweight on the left end of the beam.
Photo: British Geological Survey/ NERC/Scran
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