| 摘要 |
A system for sensing a borehole or formation characteristic at a selected depth while a drill string 12 is in the borehole 36 includes a plurality of sensors 40 to positioned at axially spaced locations along the drill string 12 , and a data transmission system 46 for transmitting signals from each of the plurality of sensors to the surface. A surface computer 22 receives the transmitted signals and determining the sensed characteristics at a selected depth as a function of one of a plurality of sensors positioned along the drill string while at a first selected depth and subsequently another of the plurality of sensors is along the drill string while at substantially the first selected depth.
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