Patent ID: 8789620

Claim:
A method of receiving and/or transmitting information in a well drilled in a geological formation between a first location and a second location, said well comprising a casing communicating with the formation, the method comprising: (i) placing a first transducer located at said first location, said first transducer comprising two electrodes, which are first and second downstream electrodes; (ii) placing a second transducer located at said second location, said second transducer comprising two electrodes, which are first and second upstream electrodes located upstream relative to the first and second downstream electrodes; (iii) transmitting an electric signal with the first transducer by applying said signal between the first and second downstream electrodes or respectively with the second transducer by applying said signal between the first and second upstream electrodes; and (iv) receiving, with the second transducer, said electric signal transmitted with the first transducer by detecting said signal between the first and second upstream electrodes, or respectively receiving, with the first transducer, said electric signal transmitted with the second transducer by detecting said signal between the first and second downstream electrodes.