2. You\'re oil well has stopped flowing on its own, and you need to pump the oil

Question

2. You're oil well has stopped flowing on its own, and you need to pump the oil out. This actually happens, and you may have seen "pumpjacks": 22. Horse Head Walking Beam Pitman Arm Bridle Counter Weight Crank V-Belt Polished Rod Prime Mover Oil Post Gear Reducer Tee Sucker Rod Cement Annulus Casing Down Hole Pump Travelling Valve Pump Barrel rations Oil Bearing Zone Oil Oil Up Stroke Down Stroke If the energy inputted is that required to lift the oil, and the energy output is the chemical energy content, calculate the ratio of energy returned to energy invested for a reservoir eters deep.

Explanation / Answer

for 1 kg oil to be extracted, potential energy change = mgh
m = 1 kg
g = 9.81 m/s/s
h = 7000 m
so PE = 9.81*7000 = 68670 J

now calorific value of crude oil is 43 810^6 J / kg
so for 1 kg crude oil extracted we get 43*10^6 J energy
so energy returned/energy invested = 43*10^6/68670 = 626.1831

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