Petroleum Engineering Interview Questions and Answers
Question - 21 : - Explain how Spontaneous logs are useful?
Answer - 21 : -
Spontaneous logs determine the permeability of the rocks in the well by denoting the electrical currents produced between the drilling fluids and formation water held in the pore spaces.
Question - 22 : - Explain what is underbalanced drilling?
Answer - 22 : -
The underbalanced drilling is an alternative way of drilling oil and gas wells, where the pressure in the wellbore is kept lower than the fluid pressure. The advantage of underbalanced drilling is that it reduces formation damage in reservoirs.
Question - 23 : - Explain the method of “Gas injection down the drill pipe”? What are the advantages of this technique?
Answer - 23 : -
In this technique air or nitrogen is injected to the drilling fluid that is injected directly down the drill pipe. The advantages of this technique is
• Improved penetration and decreased amount of gas
• Wellbore is not required to specifically designed for underbalanced drilling
• Less amount of gas required