Perforation depth control log (pdc log):

Knowing the depth of the collars makes it easy to determine the exact depth of the formation to be perforated by correlating casing-collar depth with formation depth.

Terms Related to Perforation depth control log (pdc log)

• Collar locator

  A logging device used to determine accurately the depth of a well; the log measures and records the depth of each casing collar, or coupling, ...

• Driller’s depth

  The depth of a well or features within the wellbore as measured while drilling. The measured length of each joint of drillpipe or tubing is added ...

• Depth reference

  The point in a well from which depth is measured. Alternatively, the depth reference is the point at which the depth is defined as being ...

• True vertical depth

  The vertical depth (tvd) from the surface to the depth of interest. Used for formation comparison and calculation of hydraulic pressures.

• Abnormal pressure

  1. Pressure exceeding or falling below the normal pressure to be expected at a given depth. Normal pressure increases approximately 0.465 psi per foot of ...

• Total depth (td)

  The maximum depth reached in a well.

• Depthometer

  A device used to measure the depth of a well or the depth at a specific point in a well (such as to the top ...