Downhole Data Acquisition System
Downhole measurements are used to determine physical, chemical, and structural properties of formations penetrated by a drill hole. Using a variety of instruments, these measurements are rapidly collected to make continuous in-situ records as a function of depth after the hole has been drilled or reentered. Logs are essential for performing stratigraphic and lithologic characterizations, as well as for determining physical and chemical properties of the formation at a scale that links discrete laboratory measurements with regional geophysical studies. Especially where core recovery is incomplete, logging data may provide the only way to interpret structure and lithostratigraphy.
Drilling wells in modern day utilises increasing use of measurement-while-drilling (MWD) and logging-while-drilling (LWD) tools to acquire sensory data from the reservoir while drillng. In addition, the measurements obtained by the tools & sensors can be utilised for steering a directional-drilling tool for the best possible wellbore profile.