Logging while drilling

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Horizontal Wells: Focus on the Reservoir
Series Methods in Exploration No. 14
Chapter Introduction
Author Timothy R. Carr, Erik P. Mason, Charles T. Feazel
Link Web page
Store AAPG Store
Simple vertical profile of a horizontal well, illustrating basic terms.

Sensors integrated into the drilling assembly that transmit data while drilling other than guidance data (measurement while drilling (MWD)) is considered LWD. Data can include standard measurements of the formation (electric logs such as gamma ray, resistivity, or porosity), drilling parameters (e.g., downhole torque, weight on bit, temperature, or pressure), or geophysical information (look-ahead seismic profiles). Data can be transmitted to the surface or stored for later retrieval.

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Logging while drilling
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