The reception of signals that can be coupled with the wall of a well or drilling

摘要

Signal reception system adapted to be lowered into a bore hole, suspended from an electricity-carrying cable and capable of being coupled with the walls to receive signals propagating within the surrounding formations. …??It comprises one or more expansible enclosures (E1-E3) joined to one another by ducts (15) and suspended below a rigid body (1) which is connected to the surface by an electricity-carrying cable (3). Each enclosure comprises a flexible lateral wall in which there is incorporated at least one receiving element. The various enclosures may be expanded by injection of a pressurised fluid produced by a hydraulic system contained within the rigid body (1). The receiving elements are connected to a signal acquisition device which is disposed within the body (1), which communicates with a laboratory truck (6) at the surface. …??Application to, for example, seismic prospecting.