What is the difference between measurements while drilling (MWD) and logging while drilling (LWD)? - Quora
![Optimization of pulsed-wave Doppler ultrasound for estimation of influx/efflux in oil and gas boreholes while drilling using conventional LWD transducers - ScienceDirect Optimization of pulsed-wave Doppler ultrasound for estimation of influx/efflux in oil and gas boreholes while drilling using conventional LWD transducers - ScienceDirect](https://ars.els-cdn.com/content/image/1-s2.0-S0920410522008506-gr1.jpg)
Optimization of pulsed-wave Doppler ultrasound for estimation of influx/efflux in oil and gas boreholes while drilling using conventional LWD transducers - ScienceDirect
![Figure F2. Schematic of the logging-while-drilling (LWD) tool string with details of the resistivity-at-the-bit (RAB) tool. VDN = Vision Neutron Density tool, NMR-MRP = Nuclear Magnetic Resonance tool, MWD = measurement-while-drilling tool, Figure F2. Schematic of the logging-while-drilling (LWD) tool string with details of the resistivity-at-the-bit (RAB) tool. VDN = Vision Neutron Density tool, NMR-MRP = Nuclear Magnetic Resonance tool, MWD = measurement-while-drilling tool,](http://www-odp.tamu.edu/publications/204_SR/108/images/08_f02.gif)
Figure F2. Schematic of the logging-while-drilling (LWD) tool string with details of the resistivity-at-the-bit (RAB) tool. VDN = Vision Neutron Density tool, NMR-MRP = Nuclear Magnetic Resonance tool, MWD = measurement-while-drilling tool,
![Figure F2. Configuration of the drill string used for LWD operations on ODP Leg 204. VDN = Vision Density Neutron tool. MWD = measurement-while-drilling tool. GVR = GeoVision resistivity-at-the-bit tool. Figure F2. Configuration of the drill string used for LWD operations on ODP Leg 204. VDN = Vision Density Neutron tool. MWD = measurement-while-drilling tool. GVR = GeoVision resistivity-at-the-bit tool.](http://www-odp.tamu.edu/publications/204_SR/106/images/06_f02.gif)