Well's Internal Training

Which of the following property is not used to describe a reservoir rock?

• Porosity

• Permeability

• Hardness

• Matrix

Answer explanation

Rocks are described by three properties:

Porosity - quantity of pore space

Permeability - ability of a formation to flow

Matrix - major constituent of the rock (sandstone, shale, limestone, etc)

The rate of flow of a liquid through a formation depends on:

• viscosity of the fluid

• porosity

• pressure drop

• permeability

Answer explanation

The rate of flow of a liquid through a formation depends on:

The pressure drop.

The viscosity of the fluid.

The permeability.

Which of the following statement about Depth is true?

• Depth is always wrong

• Wireline Depth is better than Driller's Depth

• Reference Depth is always the first logging run in hole

• Depth errors can be corrected

VDL stands for:

• Very Delicious Lasagna

• Variable Density Log

• Velocity Distribution Log

• Variable Design Language

Which of the following statements are true about cement evaluation tools and principals

• CBL is measured from 3ft receiver

• Casing arrival is always the earliest signal on VDL

• Cycle Skipping often occurs in bad cement interval

• Higher CBL amplitude usually means poorer cement quality

Bond Index is:

• Attenuation in zone of interest / Attenuation in best cemented section

• Attenuation in zone of interest / Attenuation in free pipe section

• Attenuation in free pipe section / Attenuation in zone of interest

• Attenuation in best cemented section / Attenuation in zone of interest

Which of the following statement is true for Production Logging?

• Fullbore Spinner gives 2 phase flow velocity

• Electrical Probes provides Oil Holdup

• GHOST (Optical Probe) is used to detect Gas

• Gradio can be run in wells up to 80deg

Choose the correct statements about PL Spinners:

• +ve spinner RPS is when flow is from above the spinner

• Spinner RPS is the actual fluid velocity

• +ve spinner RPS is when flow is from below the spinner

• Vapp is the fluid velocity +/- threshold

Sigma works well for:

• Gas saturation in fresh formation water

• Oil saturation in fresh formation water

• Oil saturation in very saline formation water

• Gas saturation in very saline formation water

C/O Logging is:

• based on Inelastic energy spectrum of Carbon and Oxygen

• Slow!

• based on Capture energy spectrum of Carbon and Oxygen

• the preferred oil saturation logging in fresh formation water environment