US3693735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling tool with elements having diamond-studded attack surface
Assignee: Total Compagnie Francaise des Petroles SA
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Filing: 1970-09-29
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Granted: 1972-09-26
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Expires: 1990-09-29
Abstract
Abstract A drilling tool for drilling in either hard or soft ground at high speeds and incorporating a plurality of diamond-studded protuberances formed on the end cutting surface of the tool, with a plurality of radially outwardly extending grooves formed in the end of the tool and having additional circular grooves formed between rows of protuberances to assist in removal of the debris. The protuberances are formed so that the diamond projections thereon are each aligned with each other in a given row in the direction of rotation to assist in cutting.
Inventors
- 👤 Abel C Cortes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:32
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
286 words
A drilling tool having a basic general surface of revolution interrupted by a plurality of grooves and recesses for the evacuation of slush, said drilling tool comprising a plurality of concentric stepped projections formed on said revolution surface around the axis of rotation of said drilling tool interrupting said surface, each of said projections having a crest forming a circle arc symmetrically arranged around the axis of rotation of said drilling tool, a plurality of diamond-studded prismatic blocks positioned in said stepped projections at the crests of each of said stepped projections over the general surface of revolution of said tool, the longitudinal axis of each diamondstudded block passing through the circle arc of the stepped projection in which it is positioned and being perpendicular to a first line which is tangential to a second line intersecting the crests of consecutive stepped projections, said diamond-studded blocks being arranged in a plurality of sectors formed on the surface of revolution of said drilling tool by said grooves, the blocks of the consecutive circle arcs of each sector lying in a plurality of planes parallel to a first plane containing the first blocks of each sector and passing through the axis of rotation of said tool, each diamond-studded block having a flat end surface formed at right angles to the longitudinal axis of said block, a crest of each prismatic block lying on the corresponding circle arc of the stepped projection in which said block is positioned and facing the direction of rotation of said drilling tool, the planar surfaces on each side of said crest forming an angle of between plus and minus 10* with a longitudinal plane in the direction of rotational movement of said tool.
Claim 2
Dependent Claim
286 words
A drilling tool having a basic general surface of revolution interrupted by a plurality of grooves and recesses for the evacuation of slush, said drilling tool comprising a plurality of concentric stepped projections formed on said revolution surface around the axis of rotation of said drilling tool interrupting said surface, each of said projections having a crest forming a circle arc symmetrically arranged around the axis of rotation of said drilling tool, a plurality of diamond-studded prismatic blocks positioned in said stepped projections at the crests of each of said stepped projections over the general surface of revolution of said tool, the longitudinal axis of each diamondstudded block passing through the circle arc of the stepped projection in which it is positioned and being perpendicular to a first line which is tangential to a second line intersecting the crests of consecutive stepped projections, said diamond-studded blocks being arranged in a plurality of sectors formed on the surface of revolution of said drilling tool by said grooves, the blocks of the consecutive circle arcs of each sector lying in a plurality of planes parallel to a first plane containing the first blocks of each sector and passing through the axis of rotation of said tool, each diamond-studded block having a flat end surface formed at right angles to the longitudinal axis of said block, a crest of each prismatic block lying on the corresponding circle arc of the stepped projection in which said block is positioned and facing the direction of rotation of said drilling tool, the planar surfaces on each side of said crest forming an angle of between plus and minus 10* with a longitudinal plane in the direction of rotational movement of said tool.
Claim 3
Dependent Claim
30 words
A drilling tool as claimed in claim 1, wherein the distance between consecutive blocks on the same circle arc is equal to at least one-half the length of a block.
Claim 4
Dependent Claim
37 words
A drilling tool as claimed in claim 1, wherein each block has a plane surface opposite the crest facing the direction of rotation, said plane surface being perpendicular to a plane bi-secting the angle of said crest.
Claim 5
Dependent Claim
83 words
A drilling tool as claimed in claim 1, wherein the level of the discontinuous attack surface of said tool, constituted by said plane terminal sections of said diamond-studded blocks is an average distance from an envelope formed by said second line joining the crests of said step-like protuberances on said revolution surface when stripped of said protuberances, said average distance being equal to at least one-quarter of the length of one of the sides forming said stepped surface of said base revolution surface.
Claim 6
Dependent Claim
34 words
A drilling tool as claimed in claim 1, wherein each diamond-studded block overlaps the two sides of the stepped surface in which it is positioned, to the exclusion of the sides of adjacent steps.
Claim 7
Dependent Claim
23 words
A drilling tool as claimed in claim 5, wherein said diamond-studded blocks have a straight-line seCtion in the form of an equilateral triangle.
Claim 8
Dependent Claim
23 words
A drilling tool as claimed in claim 5, wherein said diamond-studded blocks are inclined in the direction of rotation of said drilling tool.
References Cited (Backward Citations)
US2371490A
Cited
US2817885A
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US2966949A
Cited
US3027952A
Cited
FR1261950A
Cited
US3135341A
Cited
FR1508961A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |