OilWellProject1

OilWellProject1 - ME 452: Machine Design II Project 1 -...

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ME 452: Machine Design II Project 1 - Fall 2009 Deliverable Due: Monday, September 14, 2009 Final Report Due: Friday, October 2, 2009 (Before 4:30 pm in the design offices, room 300 ME) This project is to be completed by each student individually. Background Crude oil is often found within sandy layers of porous material deep in the earth. Once discovered, a hole is bored to the oil-filled layer and a casing inserted into the hole. Then a pump is used to lift the crude oil out for processing into more useful petroleum- based products, such as gasoline, oil, diesel fuel, etc. For many wells, the machine of choice for pumping out the crude oil is the pump jack, also called the nodding donkey, pumping unit, or horse-head pump. A typical layout of the pump is shown below in Figure 1. Figure 1. Schematic Layout of the Pump Unit (from http://www.aoghs.org/pdf/September.pdf)
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The machine is powered by an electric motor, which drives a gear box through a belt drive system. This belt and gear reduction greatly increases the torque and decreases the speed, so that the crank arm of the pump unit (labeled “counter balance” above) turns very slowly (usually about 30 revolutions per minute or less). The crank drives the walking beam through two parallel connecting links, causing it to oscillate. The oscillation of the walking beam causes the horse head to move up and down, which drives the pump up and down in the well, much like a hand water pump. There are two one-way valves in the pump which causes the oil to be pumped up the pipe and out of the well. Figure 2 below shows the one-way valves in the pump. Figure 2. One way valves in the pump which cause the oil to be pulled up the pipe For a history of pumping units, see http://www.aoghs.org/pdf/September.pdf . For more information on oil pumps, see http://en.wikipedia.org/wiki/Pumpjack . For a nice animation see http://en.wikipedia.org/wiki/File:Pump_jack_animation.gif . To see some old used machinery for sale (used pumpjacks, gear boxes, etc.) go to http://www.lafoyequipment.com/pumping_units.htm . Moving ball valve moves with sucker rod Fixed ball valve Well casing Sucker rod Stroke Oil Oil Seal
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Problem Statement The goal of this project is the design and analysis of the walking beam, the two connecting links (called the pitman arm in Figure 1 above), and the two crank arms. To do this, you will need to model the kinematics of the pumping unit. You will also need to model the sucker rod and estimate the loads it places on the horse-head, so that you can estimate the loads in the links. From these loads you can determine suitable dimensions
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OilWellProject1 - ME 452: Machine Design II Project 1 -...

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