You know every time I see anything related to these old pumpjacks, it reminds me of an old man I once met in Texas. I was a tourist and the rental car got a flat tire, so I pulled the car over in front of this guy's place while I changed the tire, he was sitting out on his porch and came down to offer a hand in fixing it, got it fixed in 15-20 minutes and we chatted for awhile longer. His family used to own the land that is now an oil field, his grandfather got rich and divided up all the wells between his children and grandchildren. One by one all his family sold their wells to this oil company or that, he owned 1 pumpjack which sat right next to his old house, Just one. Every day he'd sit on his porch and listen to it pump away. Every few seconds it made a sound, sort of a "VWOOSH!" And every time it made that sound, he made 2 dollars, and that sound happened every 2 to 3 seconds, so let's even that out to every 2.5 seconds. Going 24 hours a day. 7 days a week, 365 days a year. Almost a dollar a second. This man was a multimillionaire, richest man I've ever seen with my own 2 eyes. He was a nice man, offered to call me a tow truck when I told him I was having car trouble, then offered to fetch some lemonade or a cold beer since it was such a hot day, I refused, didn't want to hassle the old guy and he gave me directions back to town (I was using GPS but it's the thought that counts)


Wait, they weren't a continuous pump? Like when they go up, they pump up the oil and when they go down, they push the oil up?


4 stroke, not 2 stroke.


I get the feeling that the actual valve looks nothing like that


[One version ia this](https://youtu.be/SFJFiyXTOa0) and works in two strokes, another works in 4. But no, they don't use a continous (impeller) pump. Didn't the shape and motion of the pumpjack tip you off it's different? An oil pump has to overcome multiple challenges: * pressurize the well so it can * be able to remove the deepest level of oil without drilling that low * since you don't really know the depth until the well is dry * have most maintenance done above * work in explosive atmospheres * should be pausable while maintaining well pressure * withstand the enormous pressures to make oil go up * work with highly viscous oil Oil well shafts are usually concrete to keep the well pressurized. The highest recorded pressure was 1200 atm (17000 psi), while usual operating pressures are 800 atm (12000 psi). The whole logic of injecting pressure instead of pumping it up (reducing pressure with a regular pump) means that if your well is sealed and you can maintain pressure, oil comes up and no trips down the well are needed. That's a huge advantage, compared to lowering yourself every few days in the well to rearrange the pumps or extend the hoses. Plus, impellers are sensible. You'll need to filter the oil from grime, dust and whatever else is in the well - before pumping it. That means continous maintenance on specialized filters done inside the well. Technical diving in water is extremely expensive and risky. Technical divers in sewage, oil or other fluids are some of the best paid employees in the world and are in high demand. And there's also a mix of gases down there which absolutely love sparks, like say, from a slipring or brushed contact in a diving suit. So nope, not a continous pump.


Well, I know it's not an impeller but like I said, every stroke is either pushing the oil or pulling it. For me, it would be way too inefficient to be a 4 strokes pump


Far from accurate but I guess it’s close enough to the general idea


I learned nothing….