Modelling electromagnetic telemetry signals in deviated wells

A method for modeling an electromagnetic (EM) telemetry signal, comprising:

• replacing a first well with equivalent electrical sources in a model;
• determining an electrical current in one or more segments in the first well based at least partially upon the equivalent electrical sources;
• generating a simulated electrical current in a second well;
• determining a normalized voltage in the one or more segments in the first well in response to the simulated electrical current in the second well;
• determining a segment voltage in the one or more segments in the first well based at least partially upon the electrical current of the one or more segments in the first well and the normalized voltage of the one or more segments in the first well;
• and
• estimating the EM telemetry signal from a transmitter in the first well based at least partially upon the segment voltages of the one or more segments in the first well.

A computing system comprising:

• one or more processors;
• and
• a memory system comprising one or more non-transitory computer-readable media storing instructions that, when executed by at least one of the one or more processors, cause the computing system to perform operations, the operations comprising:
• replacing a first well with equivalent electrical sources in a model;
• determining an electrical current in one or more segments in the first well based at least partially upon the equivalent electrical sources;
• generating a simulated electrical current in a second well;
• determining a normalized voltage in the one or more segments in the first well in response to the simulated electrical current in the second well;
• determining a segment voltage in the one or more segments in the first well based at least partially upon the electrical current of the one or more segments in the first well and the normalized voltage of the one or more segments in the first well;
• and
• estimating an electromagnetic (EM) telemetry signal from a transmitter in the first well based at least partially upon the segment voltages of the one or more segments in the first well.