Definition - What does Mud Log mean?
A Mud Log is an essential record of the drilling activities; it is prepared by the assistant of petroleum geologists during the process of drilling a well. The assistant who prepares the log is called the mud logger. The log consists of a complete record of the drilled hole together with other important parameters like mud characteristics, drill time and gas and oil shows. If any oil is observed in well samples, it is noted clearly on the Mud Log. Any indication of the presence of gas or oil is referred to as show and it is one of the most essential things a mud logger detects.
Petropedia explains Mud Log
A Mud Log contains drill string tips, oil in mud pit, chemical properties of mud which involve the weight, viscosity and salinity of the mud, gas flare records, and other things that are noticed when the well is being drilled. It is helpful when a mud logger observes any action taken at the rig which according to the logger is not correct and requires to be noted on the log. The mud loggers are responsible for monitoring and recording the drilling activity that provides essential information about the status of the well during the process of extraction of gas or oil. The Mud Log helps the loggers to make relevant decisions according to the records about the placement and efficiency of the well sites.