For the first time, the feasibility of transmitting electromagnetic signal at a rate exceeding 6 bit/s in the horizontal hole section with displacement of over 1500 m from the vertical axis is demonstrated for land wells, assuming the well is constructed with a casing extended to the productive formation top. Achieved volume of data transmission using the proposed signal transmission method with the required data density of two points per meter while drilling at a rate of 30 m/hour for following data, measured downhole while drilling: three curves of electrical resistivity, correction for density Rho, photoelectric factor Pe, density and porosity, density images (raster imaging), natural gamma, acoustic and density calipers, annular pressure, bottomhole temperature, as well as the service status data of the downhole tools. The influence of antenna positioning on signal strength and data transmission reliability has been explored. The most effective method involves utilizing the casing string as an antenna for land wells with a three-casing configuration and a horizontal section. This results in a stable signal effect with a consecutive amplitude attenuation over a distance exceeding 1.5 km in the productive formation. Factors affecting signal stability and limitations of electromagnetic telemetry application are discussed.
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