Mudlogger

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A mudlogger in the modern oil field is tasked primarily with gathering data and collecting samples during the drilling of a well. They then organize this information in the form of a graphic log, showing the data charted on a graphic representation of the wellbore.

Mudloggers observe and interpret the indicators in the mud returns during the drilling process. At regular intervals the mudlogger logs properties such as drilling rate, mud weight, flowline temperature, natural gas content and type, oil indicators, pump pressure, pump rate, lithology (rock type) of the drill cuttings, and various other items of interest. The job of a mudlogger requires a good deal of diligence and attention. Sampling the drill cuttings must be performed at proper intervals, for example, and can be difficult during rapid drilling.

Another important task of the mudlogger is to monitor gas levels and notify other personnel on the rig when gas levels may be reaching dangerous levels, so appropriate steps can be taken to avoid a dangerous well blowout.

This is not to be confused with the MWD Hand who logs data in a similar manner but whose data is vastly different in source and content. Most of the data logged by a MWD Hand comes from expensive and complex tools that are downhole.