Question

An oil well is a hole dug into the Earth that serves the purpose of bringing oil or other hydrocarbons - such as natural gas to the surface. Oil wells almost always produce some natural gas and frequently bring water up with the other petroleum products. To drill a well, a specialized piece of equipment known as a drilling rig bores a hole through many layers of dirt and rock until it reaches the oil and gas reservoir where the oil is held. It is being drilled at a depth of 6629 ft, it is observed that the top of the 10.4 inches outside diameter steel drill pipe rotates through 3 complete revolutions before the drilling bit starts to rotate. Considering G=13.34 x 10^6 psi.

a. What is the angle of twist in radians?
b. What is the maximum shearing stress (ksi) in the pipe caused by torsion?
c. What is the torque (kip-in) applied if the thickness of the pipe is 0.18 inches?
d. What power (hp) can be transmitted by the shaft at 25 Hz?
NOTE: Please store values if it is not the final answer. Final answers are in 4 decimal places

Answer 1