1.
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