AN APPARATUS FOR ACQUIRING AND RECORDING SIGNALS DELIVERED BY A SET OF SENSORS DISPOSED IN WELL PROBES

摘要

System for acquiring and recording signals furnished by a set of sensors fitted in one or more probes lowered into a well on the end of a multi-purpose cable. …Various signals to be transmitted are multiplexed before being applied to an acquisition chain (15-19) adapted for amplifying them, digitising them and coding them before applying them to a transmission channel (L) in the form of blocks of digitised words. The multiplexing means can comprise several multiplexing units. The sampling frequency for each signal and the make-up of the blocks of words are adapted to the number of units actually used. Inside the surface rig, the blocks of words are split up and arranged inside a memory in a single mode suitable for all the blocks whatever their make-up. …Application to seismic prospecting in drilling operations for example. ……