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# 1- An oil well drilling rig needs to move vertically a hookload of 250.docx

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# 1- An oil well drilling rig needs to move vertically a hookload of 250.docx

1. An oil well drilling rig needs to move vertically a hookload of 2500 tons at a speed of 30 m/min. This is the requirement as a rule of thumb while pulling the drill string out of the wellbore. a. Determine the power required to pull the string at this speed in terms of horse power. (Hint: 1 ton 100kg, 1 kJ/s-1 W, 1hp 750 W) b. If the engine efficiency if 0.56 than what is the required engine horsepower to pull the string at the specified speed. 2. Assuming an average 35% efficiency for a natural gas power plant and a heating value of natural gas approximately 40,000 kJ/m3 determine the rate of natural gas that must be burned to sustain the generation of 20 MW electricity. How much fuel (gas in m3/s) can we save if we are able to increase the efficiency only 1%? (Hint: 1 MW 1000 kw. w-1 kJ/s) Identify the type (as mechanical, electrical, or thermophysical) of the following properties: Thermal conductivity, heat capacity, density, viscosity, modulus of elasticity, tensile strength, electrical resistivity
Solution
3. thermal conductivity - thermophysical
heat capacity - do
density,viscosity,modulus of elasticity,tensile strength - - mechanical
electrical resistivity- electrical
only question 3 is solved because it is marked
.

1. An oil well drilling rig needs to move vertically a hookload of 2500 tons at a speed of 30 m/min. This is the requirement as a rule of thumb while pulling the drill string out of the wellbore. a. Determine the power required to pull the string at this speed in terms of horse power. (Hint: 1 ton 100kg, 1 kJ/s-1 W, 1hp 750 W) b. If the engine efficiency if 0.56 than what is the required engine horsepower to pull the string at the specified speed. 2. Assuming an average 35% efficiency for a natural gas power plant and a heating value of natural gas approximately 40,000 kJ/m3 determine the rate of natural gas that must be burned to sustain the generation of 20 MW electricity. How much fuel (gas in m3/s) can we save if we are able to increase the efficiency only 1%? (Hint: 1 MW 1000 kw. w-1 kJ/s) Identify the type (as mechanical, electrical, or thermophysical) of the following properties: Thermal conductivity, heat capacity, density, viscosity, modulus of elasticity, tensile strength, electrical resistivity
Solution
3. thermal conductivity - thermophysical
heat capacity - do
density,viscosity,modulus of elasticity,tensile strength - - mechanical
electrical resistivity- electrical
only question 3 is solved because it is marked
.

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