TOP 12 Oil and Gas Interview Questions and Answers–2020 (OIL & GAS)

Question Number 1: Explain What Is Well Logging?

Answer:

A well log is used for graphical representation of any drilling condition or subsurface features that come across while drilling, which is used for the evaluation of the well.

Question Number 2: Mention What Are The Different Types Of Well Logging?

Answer:

Ø Resistivity logs

Ø Spontaneous potential logs

Ø Gamma ray logs

Ø Gamma ray absorption logs

Ø Neutron logs

Ø Sonic porosity logs

Question Number 3: What Is The Importance Of Drilling Muds?

Answer:

The drilling mud are used for:

o Lubrication purpose and for cooling of the drill bit and pipe

o It removes the cuttings that come from the bottom of the oil well

o Prevent blowouts by acting as a sealant

Question Number 4: List Out The Methods Used For Well Test Analysis?

Answer:

Various methods for well test analysis are:

Ø Pressure draw down tests

Ø Pressure build up tests

Ø Type curve analysis

Ø Pulse tests and Interference

Ø Drill stem and wire line formation

Ø Gas well tests

Question Number 5: Explain What Is Pseudo Pressure?

Answer:

Pseudo pressure is a mathematical pressure function which accounts for the variable compressibility and viscosity of gas with respect to pressure.

Question Number 6: Explain The Term “bull heading”?

Answer:

“Bull heading” is a process, where gas is forced back into a formation by pumping into the annulus from the surface.

Question Number 7: Explain What Is Underbalanced Drilling?

Answer :

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 Number 8: What is difference between the Induction Logs & Spontaneous Logs?

Answer:

Induction logs are used in wells that do not use water or mud, but oil-based drilling fluids or air. They are non-conductive and therefore cannot use electric logs instead they use magnetism and electricity to measure resistivity.

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 Number 9: What Is A Blowout Preventer & Annular Blowout Preventer?

Answer:

Blowout preventer is installed on the top of the well and is used to control the back pressure produced by oil during the drilling process.

Annular blowout preventer is usually a large valve, installed above the ram preventers; it forms a protective seal in the annular space between the pipes and well bore. It seals the annulus between the Kelly, drill collar and drill pipe.

Question Number 10: Explain The Term DE sander, De slitter & Dogleg?

Answer:

De sander is a centrifugal device used for removing sand from drilling the fluid to avert the abrasion of the pumps.

While De slitter is a centrifugal device used to remove the slit or very fine particles.

When the oil well is shut-in, there is continuing flow of fluid into the well bore. This flow of fluid is referred as well bore storage.

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