LWD meaning in Earth Science ?

Answer: What is Logging While Drilling mean?

Logging while drilling (LWD) is a technique of conveying well logging tools into the well borehole downhole as part of the bottom hole assembly (BHA).

Although the terms Measurement while drilling (MWD) and LWD are related, within the context of this section, the term MWD refers to directional-drilling measurements, e.g., for decision support for the smooth operation of the drilling, while LWD refers to measurements concerning the geological formation made while drilling.[1]LWD tools work with its measurement while drilling (MWD) system 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".

LWD, while sometimes risky and expensive, has the advantage of measuring properties of a formation before drilling fluids invade deeply. Further, many wellbores prove to be difficult or even impossible to measure with conventional wireline tools, especially highly deviated wells. In these situations, the LWD measurement ensures that some measurement of the subsurface is captured in the event that wireline operations are not possible. 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.

LWD technology was developed originally as an enhancement to the earlier MWD technology to completely or partially replace wireline logging operation. With the improvement of the technology in the past decades, LWD is now widely used for drilling (including geosteering), and formation evaluation (especially for real time and high angle wells).

reference

Full Form	Category
Low-Water Data	Academic & Science
Last Working Day	Business
Labor and Workforce Development	Community
Light Weight Design	Computing
Logging While Drilling	Earth Science
Lotusworks Text Document	File Type
Long Way Of Distance	General
League of Women Designers	General
Log While Drilling	General
Leri Weill Dyschondrosteosis	General
Learn Work Develop	General
Long Wheel Drive	General
Little White Dog	General
Landspray While Drilling	General
Large Wood Debris	General
Logging While Driving	General
Little White Dress	General
Life With Dignity	General
Lotus Works Document	General
Large Woody Debris	General
Light Weight Deflectometer	General
Liquid Waste Disposal	Governmental
Lost WorkDay	Governmental
Leri-Weill Dischondrosteosis	Medical
Learning with Disability	Medical
Light-weight Designator	Military and Defence
Long Working Distance	Networking
Launch Window Display	Space Science
Left Wing Down	Space Science