Mud logging:

A portion of the mud is diverted through a gas-detecting device.

Cuttings brought up by the mud are examined under ultraviolet light to detect the presence of oil or gas.

Mud logging is often carried out in a portable laboratory set up at the well.

Terms Related to Mud logging

• Mud log

  A record of information derived from examination of drilling fluid and drill bit cuttings. See mud logging.

• Well logging

  The recording of information about subsurface geologic formations, including records kept by the driller and records of mud and cutting analyses, core analysis, drill stem ...

• Sonce

  A logging tool assembly, especially the device in the logging assembly that senses and transmits formation data.

• Ultraviolet light

  Light waves shorter than the visible blue violet waves of the spectrum. Crude oil, colored distillates, residuum, a few drilling fluid additives, and certain minerals ...

• Samples

  1. The well cuttings obtained at designated footage intervals during drilling. From an examination of these cuttings, the geologist determines the type of rock and ...

• Sonic logging

  See acoustic well logging.

• Schlumberger (pronounced “slumberjay”)

  One of the pioneer companies in electric well logging, named for the french scientist who first developed the method. Today, many companies provide logging services ...