Raise bore drilling

Details Raise bore drilling Raise bore drilling

1976-03-03

1978-06-20

Purser, Ernest R.

Boring or penetrating the earth

Enlargement of existing pilot throughbore requiring...

175195, 175320, 64 236, 173165, E21C 2300

Patent

active

040956563

ABSTRACT:
In raise bore drilling, a drill string of non-round cross-sectional configuration is connected through a pilot hole from a raise bore bit at the lower end of the pilot hole to a raise bore drilling rig at the upper end of the hole. The drill string is defined by a number of serially connected individual pipe lengths. The drill string configuration preferably is hexagonal except at one end of each length where the pipe length is round for a distance which corresponds to the length of a female threaded connection component defined by that end of the pipe length. The other end of each pipe length defines a cooperating male threaded connection component.

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patent: 3463247 (1969-08-01), Klein
patent: 3598189 (1971-08-01), Presley et al.
patent: 3874196 (1975-04-01), Hisey et al.

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