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Logging While Drilling (LWD) :
A technique of conveying well logging tools into the well borehole downhole as part of the bottom hole assembly (BHA). STELOG’s LWD suite which include but not limited to gamma ray, density, porosity, resistivity acoustics provides geological information data. In conjunction with MWD system work to transmit partial or complete measurement results to the surface via typically a drilling mud pulser or other improved techniques, while LWD tools are still in the borehole, which is called "real-time data". Complete measurement results can be downloaded
from LWD tools after they are pulled out of hole, which is called "memory data" Timely LWD data can also be used to guide well placement so that the wellbore remains within the zone of interest or in the most productive portion of a reservoir, such as in highly variable
shale reservoirs.