Apparatus for measuring and recording data from boreholes

E - Fixed Constructions – 21 – B

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E21B 49/08 (2006.01) E21B 17/02 (2006.01) E21B 47/00 (2006.01) E21B 47/01 (2006.01) E21B 47/12 (2006.01)

Patent

CA 2247644

For collecting data from a water well, down-hole sensors are housed in modules. The modules are arranged to be screwed together in-line to form a vertical string. Mechanically, the modules are secured to each other only by the screw connection. Data is transmitted to the surface on a 2-wire cable, there being no other electrical connection between the modules and the surface. The modules are connected in multi-drop configuration to the 2-wire cable. Data is transmitted using time-division multiplexing.

Des capteurs fond de trou logés à l'intérieur de modules sont utilisés pour recueillir les données dans un puits de forage. Les modules en question sont assemblés les uns aux autres par vissage, formant ainsi un chapelet d'instruments vertical. Mécaniquement, les modules ne sont rassemblés les uns aux autres que par l'intermédiaire d'éléments filetés. Les données sont transmises à la surface au moyen d'un câble à deux conducteurs, aucune autre connexion électrique ne reliant les modules à la surface. Les modules sont connectés au câble à deux conducteurs dans une configuration de liaison multipoint. Les données sont transmises par multiplexage temporel.

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