Patent US3635295A successfully refreshed from Google Patents.
US3635295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for drilling a small borehole downwardly from the bottom of a large borehole
Assignee: Fenix and Scisson Inc
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Filing: 1969-12-02
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Granted: 1972-01-18
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Expires: 1989-12-02
Abstract
Abstract A small borehole drilling tool, lowered into a large borehole tubular drilling bit, includes a drill shaft interconnected to the large borehole drilling bit through driving drums for common rotation therewith. The small borehole drilling tool further includes upwardly of the drill shaft a coaxial neck, and an annular seal interposed between the neck and the inner wall of the large borehole drilling bit to form a drilling fluid chamber which receives and retains drilling fluid which in turn produces a downward thrust force on the upper surface of the annular seal to force the small borehole drill shaft downwardly into the earth during rotation thereof.
Inventors
- 👤 James H Cobbs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:41
CPC Classifications
E; E21; E21B; E21B25/00; E21B25/02; E21B25/04; E21B10/00; E21B10/64; E21B17/00; E21B17/02; E21B17/04; E21B17/07
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
221 words
An apparatus for drilling a small borehole downwardly from the bottom of a large borehole comprising: a tubular large borehole drilling tool having internal longitudinal flutes in the lower portion thereof; means for rotating said large borehole drilling tool from the earth''s surface; a tubular drill shaft coaxially received within the large borehole drilling tool and having a bit secured to the lower end thereof; a drive drum rigidly secured to the upper end of said drill shaft and having a longitudinal opening therethrough communicating with the opening in said drill shaft whereby drilling fluid introduced in the upper end of said large drilling tool flows downwardly through said drive drum, said drill shaft, and out through said bit; at least one drive lug secured to the outer periphery of said drive drum and extending outwardly therefrom to engage said flutes to cause rotation of the drive drum and drill shaft as said large drilling tool is rotated and permitting longitudinal movement of said drill shaft and drive drum relative to said large borehole drilling tool; and seal cup means affixed to the upper end of said tubular drill shaft, the seal cup means sealably and slidably engaging the interior of said tubular large borehole drilling tool providing a fluid chamber responding to fluid pressure to force said drill shaft downwardly.
Claim 2
Independent Claim
221 words
An apparatus for drilling a small borehole downwardly from the bottom of a large borehole comprising: a tubular large borehole drilling tool having internal longitudinal flutes in the lower portion thereof; means for rotating said large borehole drilling tool from the earth''s surface; a tubular drill shaft coaxially received within the large borehole drilling tool and having a bit secured to the lower end thereof; a drive drum rigidly secured to the upper end of said drill shaft and having a longitudinal opening therethrough communicating with the opening in said drill shaft whereby drilling fluid introduced in the upper end of said large drilling tool flows downwardly through said drive drum, said drill shaft, and out through said bit; at least one drive lug secured to the outer periphery of said drive drum and extending outwardly therefrom to engage said flutes to cause rotation of the drive drum and drill shaft as said large drilling tool is rotated and permitting longitudinal movement of said drill shaft and drive drum relative to said large borehole drilling tool; and seal cup means affixed to the upper end of said tubular drill shaft, the seal cup means sealably and slidably engaging the interior of said tubular large borehole drilling tool providing a fluid chamber responding to fluid pressure to force said drill shaft downwardly.
Claim 3
Dependent Claim
53 words
An apparatus according to claim 1 including: an alignment drum slidably and nonrotatably received on said drill shaft below said first drive drum, said alignment drum having at least one drive lug secured to the outer periphery thereof to slidably engage the flutes on the interior surface of the large borehole drilling tool.
Claim 4
Dependent Claim
41 words
An apparatus as in claim 1 wherein said drive lug on said first drum comprises: a plurality of plate portions pivotally secured together to form a unitary outwardly expandable linkage; and spring means biasing said linkage ouTwardly from said drive drum.
Claim 5
Dependent Claim
15 words
An apparatus according to claim 1 including: wire-line attachment means secured to said drive drum.
Claim 6
Dependent Claim
40 words
An apparatus according to claim 1 including: an upstanding tubular neck portion projecting from the upper end of said drive drum, the tubular interior being in communication with drive drum opening, said neck portion having a fluid passageway aperture therein.
Claim 7
Dependent Claim
19 words
An apparatus as in claim 5 including: wire-line tool attachment means at the upper end of said neck portion.
Claim 8
Dependent Claim
38 words
An apparatus as in claim 5 wherein said seal cup means is interposed between the outer periphery of said neck portion and the inner periphery of large borehole drill tool providing a fluid chamber receiving drilling fluid thereabove.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |