Abstract: A method of monitoring downhole conditions in a borehole includes receiving sensor data through a network of nodes provided at selected positions on a drill string disposed in the borehole. An inference is made about the downhole condition from the sensor data. A determination is made whether the downhole condition matches a target downhole condition within a set tolerance. At least one parameter affecting the downhole condition is selectively adjusted if the downhole condition does not match the target downhole condition within the set tolerance.

Abstract: A method of monitoring downhole conditions in a borehole includes receiving sensor data through a network of nodes provided at selected positions on a drill string disposed in the borehole. An inference is made about the downhole condition from the sensor data. A determination is made whether the downhole condition matches a target downhole condition within a set tolerance. At least one parameter affecting the downhole condition is selectively adjusted if the downhole condition does not match the target downhole condition within the set tolerance.

Abstract: 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.