FIELD: drilling of soil or rock.
SUBSTANCE: invention relates to drilling a well, in particular to connecting devices for use in conjunction with a drill string, and may be used to transmit signals over an electromagnetic communication channel. Disclosed is a device is for use in conjunction with a drill string that is electrically conductive and extends from an inground distal end, that includes an inground tool, to a drill rig, comprising: a group of electrical isolators; a housing that defines a through passage along a length thereof. Said housing is configured to support the electrical isolators surrounding the through passage to form an electrically isolating break in the drill string. Responsive to the drill rig pushing on the drill string and responsive to the drill rig pulling on the drill string, each isolator of the group of isolators is subject to no more than a compressive force. Housing defines a housing cavity to receive an electronics package having a signal port and configured for electrical connection of the signal port across the electrically isolating break.
EFFECT: improved longevity of the connecting isolating device in an aggressive well environment.
16 cl, 12 dwg
