Expandable and contractible rotary well drilling bit

Boring or penetrating the earth – Cutter element laterally shiftable below ground

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

E21B 926

Patent

active

040319725

ABSTRACT:
A rotary drill bit which is contractible to fit within a casing to permit withdrawal through the casing, and which is expandable below the casing to drill a well bore of a diameter larger than the outside diameter of the casing so as to permit the casing to follow the bit as drilling progresses to prevent the collapse of the well bore thereabove. The drill bit includes a base having pivotally mounted thereon a plurality, e.g., three, circumferentially spaced cutter arms, the cutter arms being pivotable inwardly and outwardly between retracted positions corresponding to the contracted condition of the bit and extended positions corresponding to the expanded condition of the bit. Stops are provided for preventing outward pivotal movement of the cutter arms beyond their extended positions and inward pivotal movement beyond their retracted positions, certain of these stops carrying the drilling load so that no substantial loads are applied to the pivot pin. Fluid passages in the base flush cuttings from the stops.

REFERENCES:
patent: 1428774 (1922-09-01), Gardner
patent: 1571309 (1926-02-01), Wall
patent: 2705129 (1955-03-01), Menton et al.
patent: 2822150 (1958-02-01), Muse et al.
patent: 3817339 (1974-06-01), Furse

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Expandable and contractible rotary well drilling 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 Expandable and contractible rotary well drilling bit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Expandable and contractible rotary well drilling bit will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1516129

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.