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1. A certain crank counterbalance has its center of gravity 33 in. from the center of the crankshaft when stroke length is 44 in. In order to reduce pumping speed, and thereby decrease peak polished rod load, it was decided to change the stroke length to 64 in. What will be the new distance from the center of gravity of the counterbalance to the center of the crankshaft if it is desired to keep the counterbalance effect the same?
2. The overall efficiency of a certain pumping unit (utilizing an electric motor as the prime mover) is 39 percent. If electric power costs $0.03 per kilowatt-hour, calculate the cost (for power only) of lifting a barrel of fluid of specific gravity 0.855 from a depth of 5400 ft.
3. A well in the Steamboat Butt Field (Wyoming) is producing 584 bbl per day of fluid having a specific gravity of 0.90. Pump setting depth is 5125 ft, pumping fluid level is 3200 ft, and tubing pressure is 50 psi. What is the net lift of the fluid?
4. For the well of Prob. 3, the fuel requirement for the prime mover is 3.03 MCF/day of a gas having a net heating value of 1025 Btu/SCF. What is the overall efficiency of the installation?
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