**Td:**

## Terms Related to Td

### Total depth (td)

The maximum depth reached in a well.

### 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 isÂ added ...

### Pdc log

Abbreviation: perforating depth control log

### Perforation depth control log (pdc log)

A special type of nuclear log that measures the depth of each casing collar. Knowing the depth of the collars makes it easy to determine ...

### 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 ...

### 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 ...

### 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, ...

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