Patent US3575247A successfully refreshed from Google Patents.
US3575247A
Expired / Lapsed
US
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Diamond bit unit
Assignee: Shell USA Inc
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Filing: 1969-07-07
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Granted: 1971-04-20
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Expires: 1989-07-07
Abstract
Abstract A diamond drill bit unit including a diamond bit, drill collar means operatively associated with said bit, and vibration reducing stabilizing means provided on said drill collar means.
Inventors
- 👤 Robijn Feenstra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:37
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1078; E21B10/00; E21B10/46
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
214 words
A diamond drill bit unit for performing rotary drilling operations in subsurface formations and having a central axis, said unit comprising: a diamond bit; drill collar means operatively associated with said diamond bit; stabilizing means comprising stabilizing elements mounted on said drill collar means, said stabilizing elements having outer surfaces which are conically arranged with respect to the central axis of the diamond bit unit said surfaces lying on cones which are arranged with the tops thereof in the direction in which the bit is axially loaded during operation; and a plurality of diamonds touching said conical surfaces and set in said stabilizing elements each of said diamonds being set in a cutting position in a directions tangential to a helical line passing through the location of the diamond and having an axis coinciding with the central axis of the diamond bit unit this tangential direction being taken at the location of each diamond, each diamond further being set in a blunt position in a direction radial to the central axis of the diamond bit unit with the greatest cutting diameter of the plurality of diamonds set in a conical surface directly adjacent to the diamond bit being at least greater than the greatest cutting diameter of the diamonds set in the diamond bit.
Claim 2
Dependent Claim
214 words
A diamond drill bit unit for performing rotary drilling operations in subsurface formations and having a central axis, said unit comprising: a diamond bit; drill collar means operatively associated with said diamond bit; stabilizing means comprising stabilizing elements mounted on said drill collar means, said stabilizing elements having outer surfaces which are conically arranged with respect to the central axis of the diamond bit unit said surfaces lying on cones which are arranged with the tops thereof in the direction in which the bit is axially loaded during operation; and a plurality of diamonds touching said conical surfaces and set in said stabilizing elements each of said diamonds being set in a cutting position in a directions tangential to a helical line passing through the location of the diamond and having an axis coinciding with the central axis of the diamond bit unit this tangential direction being taken at the location of each diamond, each diamond further being set in a blunt position in a direction radial to the central axis of the diamond bit unit with the greatest cutting diameter of the plurality of diamonds set in a conical surface directly adjacent to the diamond bit being at least greater than the greatest cutting diameter of the diamonds set in the diamond bit.
Claim 3
Dependent Claim
34 words
The diamond bit unit according to claim 1, wherein the smallest cutting diameter of the diamonds of the stabilizing means is equal to the largest cutting diameter of the diamonds of the diamond bit.
Claim 4
Dependent Claim
20 words
The diamond bit unit according to claim 1, wherein the conical surfaces have a top angle between 10'' and 40''.
Claim 5
Dependent Claim
24 words
The diamond bit unit according to claim 1, wherein a plurality of conical surfaces are distributed over the length of the drill collar means.
Claim 6
Dependent Claim
66 words
The diamond bit unit according to claim 4, wherein the smallest cutting diameter of the diamonds set in a first conical surface of the stabilizing means not directly adjacent to the diamond bit, is equal to the largest cutting diameter of the diamonds set in a second conical surface of the stabilizing means which surface is situated between the first conical surface and the diamond bit.
Claim 7
Dependent Claim
36 words
The diamond bit unit according to claim 1, wherein the stabilizing elements having surfaces which are conically arranged with respect to the central axis of the diamond bit unit are of wear-resisting material enclosing the diamonds.
Claim 8
Dependent Claim
62 words
The diamond bit unit according to claim 1, wherein the drill collar has an outer diameter which is at least smaller than the smallest cutting diameter of the diamonds of the stabilizing means, and wherein at least one channel substantially extending in longitudinal direction is arranged between each pair of stabilizing elements having the outer surfaces thereof lying on a common cone.
Claim 9
Dependent Claim
77 words
The diamond bit unit according to claim 1, wherein at least one stabilizing element comprises additional diamonds which are set in the stabilizing element in a blunt position in directions tangential to as well as radial to the central axis of the diamond bit unit, these diamonds touching outer surfaces of the stabilizing element which border the conical surface thereof at at least one side and lie within the cone on which the conical surface is located.
Claim 10
Dependent Claim
153 words
A drill collar suitable for use in rotary drilling operations by means of diamond bits in subsurface formations; stabilizing elements mounted on said drill collar having outer surfaces which are arranged on at least two noncoinciding conical planes having their central axes coinciding with the central axis of the drill collar; diamonds set in the stabilizing elements, and touching the conical surfaces, the largest cutting diameter of the diamonds lying in a second conical plane, and the second conical plane enveloping the first conical plane, each diamond being set in a cutting position in a direction tangential to a helical line passing through the location of the diamond and having an axis coinciding with the central axis of the drill collar, said tangential direction being taken at the location of each diamond, and each diamond being set in a blunt position in a direction radial to the central axis of the drill collar.
Claim 11
Dependent Claim
153 words
A drill collar suitable for use in rotary drilling operations by means of diamond bits in subsurface formations; stabilizing elements mounted on said drill collar having outer surfaces which are arranged on at least two noncoinciding conical planes having their central axes coinciding with the central axis of the drill collar; diamonds set in the stabilizing elements, and touching the conical surfaces, the largest cutting diameter of the diamonds lying in a second conical plane, and the second conical plane enveloping the first conical plane, each diamond being set in a cutting position in a direction tangential to a helical line passing through the location of the diamond and having an axis coinciding with the central axis of the drill collar, said tangential direction being taken at the location of each diamond, and each diamond being set in a blunt position in a direction radial to the central axis of the drill collar.
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |