Downhole compaction and stabilization back reamer and drill bit

Details Downhole compaction and stabilization back reamer and drill bit Downhole compaction and stabilization back reamer and drill bit

1991-09-23

1993-06-22

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Noncutting portion forwardly of cutting portion

175 61, E21B 708, E21B 728

Patent

active

052209644

ABSTRACT:
Improved back reamers (20, 60, 80, 100) are disclosed for use in back reaming a pilot bore in a trenchless boring operation. In three of the heads (20, 60, 100), truncated cylinders are mounted on a body (22) of the head with the truncated cylinders each defining a convex truncated surface facing the walls of the bore. Rotation of the head while moving the head in the direction to be reamed, the convex truncated surface will compact the soil into a wall of the bore of desired final diameter and stabilize the wall. A back reamer (80) is provided with a plurality of directional cams (84) which permit the head to be oscillated in either direction about the drill string axis. The heads can be reversed to act as drill bits as well.

REFERENCES:
patent: 2328735 (1943-09-01), Miller
patent: 2599041 (1952-06-01), Bannister
patent: 2809015 (1957-10-01), Phipps
patent: 2911195 (1959-11-01), Backer
patent: 2973821 (1961-03-01), Stihl
patent: 3945447 (1976-03-01), Peterson

Affiliated with

Also associated with

Rating

Downhole compaction and stabilization back reamer and drill bit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Downhole compaction and stabilization back reamer and drill bit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Downhole compaction and stabilization back reamer and drill bit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1436580