Patent US4919220A successfully refreshed from Google Patents.
US4919220A
Expired / Lapsed
US
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Cutting structures for steel bodied rotary drill bits
Assignee: ReedHycalog LP
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Filing: 1988-01-25
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Granted: 1990-04-24
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Expires: 2008-01-25
Abstract
Abstract A rotary drill bit for use in drilling or coring holes in subsurface formations comprises a bit body having a shank for connection to a drill string, a plurality of cutting structures mounted at the surface of the bit body, and a passage in the bit body for supplying drilling fluid to the surface of the bit body for cooling and/or cleaning the cutting structures. The bit body is formed from steel, and each cutting structure comprises a cutting element, in the form of a unitary layer of thermally stable polycrystalline diamond material, brazed to a carrier received in a socket in the steel body of the bit.
Inventors
- 👤 John Fuller
- 👤 Michael C. Regan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:21
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/567; E21B10/60
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
126 words
A rotary drill bit for use in drilling or coring holes in subsurface formations, comprising a bit body having a shank for connection to a drill string, a plurality of cutting structures mounted at the surface of the bit body, and a passage in the bit body for supplying drilling fluid to the surface of the bit body for cooling and/or cleaning the cutting structures, the bit body being formed from steel, at least one of the cutting structures comprising a cutting element, in the form of a preformed unitary layer of polycrystalline diamond material which is thermally stable up to a temperature higher than 750° C., the pre-formed layer being bonded to a carrier received in a socket in the steel body of the bit.
Claim 2
Dependent Claim
126 words
A rotary drill bit for use in drilling or coring holes in subsurface formations, comprising a bit body having a shank for connection to a drill string, a plurality of cutting structures mounted at the surface of the bit body, and a passage in the bit body for supplying drilling fluid to the surface of the bit body for cooling and/or cleaning the cutting structures, the bit body being formed from steel, at least one of the cutting structures comprising a cutting element, in the form of a preformed unitary layer of polycrystalline diamond material which is thermally stable up to a temperature higher than 750° C., the pre-formed layer being bonded to a carrier received in a socket in the steel body of the bit.
Claim 3
Dependent Claim
49 words
A rotary drill bit according to claim 1, wherein each carrier comprises a stud received in a socket in the bit body, the stud being pre-formed in one piece and the pre-formed unitary layer of thermally stable polycrystalline diamond material being bonded directly to a surface on the stud.
Claim 4
Dependent Claim
17 words
A rotary drill bit according to claim 2, wherein each stud is formed from cemented tungsten carbide.
Claim 5
Dependent Claim
51 words
A rotary drill bit according to claim 1, wherein each carrier comprises a backing element bonded to a surface on a stud which is received in a socket in the bit body, the preformed unitary layer of thermally stable polycrystalline diamond material being bonded to a surface of the backing element.
Claim 6
Dependent Claim
17 words
A rotary drill bit according to claim 4, wherein each stud is formed from cemented tungsten carbide.
Claim 7
Dependent Claim
18 words
A rotary drill bit according to claim 4, wherein each backing element is formed from cemented tungsten carbide.
Claim 8
Dependent Claim
25 words
A rotary drill bit according to claim 1, wherein each pre-formed unitary layer of thermally stable polycrystalline diamond material is brazed to its respective carrier.
Claim 9
Dependent Claim
28 words
A rotary drill bit according to claim 7, wherein a metal shim is sandwiched between the pre-formed unitary layer of thermally stable polycrystalline diamond material and its carrier.
Claim 10
Dependent Claim
22 words
A rotary drill bit according to claim 8, wherein the metal of the shim is selected from copper, nickel or copper-nickel alloy.
Claim 11
Independent Claim
126 words
A method of manufacturing a rotary drill bit for use in drilling or coring holes in subsurface formations, comprising forming from steel a bit body having a shank for connection to a drill string, a plurality of sockets at the surface of the bit body, and a passage in the bit body for supplying drilling fluid to the surface of the bit body, forming at least one of a plurality of cutting structures by bonding to a carrier a pre-formed unitary layer of polycrystalline diamond material which is thermally stable up to a temperature higher than 750° C., and mounting the cutting structures at the surface of the steel bit body by securing the carriers of the cutting structures within respective sockets in the bit body.
Claim 12
Independent Claim
126 words
A method of manufacturing a rotary drill bit for use in drilling or coring holes in subsurface formations, comprising forming from steel a bit body having a shank for connection to a drill string, a plurality of sockets at the surface of the bit body, and a passage in the bit body for supplying drilling fluid to the surface of the bit body, forming at least one of a plurality of cutting structures by bonding to a carrier a pre-formed unitary layer of polycrystalline diamond material which is thermally stable up to a temperature higher than 750° C., and mounting the cutting structures at the surface of the steel bit body by securing the carriers of the cutting structures within respective sockets in the bit body.
Claim 13
Dependent Claim
25 words
A method according to claim 10, including the step of brazing each pre-formed unitary layer of thermally stable polycrystalline diamond material to its respective carrier.
Claim 14
Dependent Claim
36 words
A method according to claim 11, including the step of sandwiching a metal shim between the pre-formed unitary layer of thermally stable polycrystalline diamond material and the carrier when brazing the cutting element to the carrier.
Claim 15
Dependent Claim
20 words
A method according to claim 12, wherein the metal of the shim is selected from copper, nickel or copper-nickel alloy.
Claim 16
Dependent Claim
47 words
A method according to claim 10, wherein each carrier comprises a stud received in a socket in the bit body, the stud being pre-formed in one piece and the pre-formed unitary layer of thermally stable polycrystalline diamond material being bonded directly to a surface on the stud.
Claim 17
Dependent Claim
15 words
A method according to claim 14, wherein each stud is formed from cemented tungsten carbide.
Claim 18
Dependent Claim
49 words
A method according to claim 10, wherein each carrier comprises a backing element bonded to a surface on a stud which is received in a socket in the bit body, the pre-formed unitary layer of thermally stable polycrystalline diamond material being bonded to a surface of the backing element.
Claim 19
Dependent Claim
15 words
A method according to claim 16, wherein each stud is formed from cemented tungsten carbide.
Claim 20
Dependent Claim
16 words
A method according to claim 16, wherein each backing element is formed from cemented tungsten carbide.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-23 | 1993-10-23 | 1994-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-23 | 1997-10-23 | 1998-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-23 | 2001-10-23 | 2002-04-24 | $7700.00 | Window Closed / Lapsed |