Provided are single and multi-stage hand-portable directional drilling devices designed to drill through space underground, particularly for drilling channels underground from within an interior building space. Also provided are improvements in a drill head providing means for removing or preventing clogging of a drill tip lubricant channel or fluid hole.

A tool configured to facilitate installation or removal of a seal sub from an annular structure includes a support structure configured to be coupled to the annular structure, a shaft extending axially from the support structure, and an engaging structure coupled to the shaft. The engaging structure includes a plurality of engaging members, and each of the plurality of engaging members is configured to move in a radial direction between a retracted position that enables the engaging structure to be inserted into the seal sub and an extended position that enables the respective engaging member of the plurality of engaging members to engage the seal sub.

Provided are single and multi-stage hand-portable directional drilling devices designed to drill through space underground, particularly for drilling channels underground from within an interior building space. Also provided are improvements in a drill head providing means for removing or preventing clogging of a drill tip lubricant channel or fluid hole.

A jig and method useful for coupling and/or uncoupling drill string sections. In some embodiments, the jig comprises a body having an outer surface for engaging a torqueing tool and a cavity extending from a first end to a second end of the body and an engagement means at the first end of the body. The engagement means may be dimensioned to non-rotationally engage an outer surface of a first end of a drill string section and the cavity may be sized to fit about a drill string section.