FIELD: means of transmitting signals over an electromagnetic communication channel.
SUBSTANCE: in particular, disclosed is a safety sub, comprising: a hollow tubular body comprising an upper portion and a lower portion, wherein upper portion is configured to stay in connection with drive pipe or top drive when additional tubular members are added to drill string, and lower section is made with possibility of repeated connection and disconnection with drill string, when additional tubular elements are added to drill string; and an insulating layer located between the upper portion and the lower portion, wherein the insulating layer is connected to the upper portion by the first threaded connection and to the lower portion by the second threaded joint.
EFFECT: providing reliable transmission of signals by improving signal quality by reducing noise.
13 cl, 9 dwg
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