Rječnik
Njihalica
uređaj na ušću bušotine kojim se preko niza klipnih šipki pokreće dubinska sisaljka (pumpa) za crpljenje nafte iz bušotine; pogon je uglavnom elektromotorni
Beam pumper/Rocking-beam pumping unit
device located on a wellhead, giving power to the depth extraction pump via a series of sucker rods for withdrawing petroleum from the well; powered by an electromotor.