PEH:Mud Logging

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The literature provides excellent reviews of the early history.[4][5] Computerized data acquisition and the ability to routinely transfer continuously acquired data to the office data center enabled the broader application of more sophisticated interpretive techniques and the integration of data from different sources into the geological and reservoir model, in near real time. This, coupled with the blossoming of measurement-while-drilling (MWD) and logging-while-drilling (LWD) tools, moved the mud-logging unit into a new role as a hub for rig-site data gathering and transmission.[5] Starting in the 1980s, significant improvements to existing technologies, as well as major technical breakthroughs, have given the geologist and petroleum engineer a great number of powerful mud-logging tools to interpret and integrate geological, drilling, and geochemical data. These tools are discussed in subsequent sections of this chapter. The traditional products delivered by a mud-logging vendor include geological evaluation, petrophysical/reservoir formation evaluation, and drilling engineering support services. In this overview, we consider that these products support three basic processes associated with drilling and evaluation of wells: formation evaluation (building or refining the geological and reservoir models), drilling engineering and operations (the planning and execution of the well construction process), and maintaining drilling and evaluation operations with appropriate health, safety, and environmental (HSE) consideration. The following section describes the path that drilling fluid follows during the drilling operation to explain where the logger obtains data.

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