US4884477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary drill bit with abrasion and erosion resistant facing
Assignee: Baker Hughes Oilfield Operations LLC
•
Filing: 1988-03-31
•
Granted: 1989-12-05
•
Expires: 2008-03-31
Abstract
Abstract A rotary drill bit is provided for boring earth formations which includes a bit blank and a metal matrix secured to the blank. The metal matrix includes a filler material dispersed therein. Cutting elements are mounted on the exterior face of the bit, and substantially all of the exposed internal and external surfaces of the bit are coated with an erosion and abrasion resistant hardfacing material bonded to the metal matrix.
Inventors
- 👤 Redd H. Smith
- 👤 Craig H. Cooley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:23
CPC Classifications
B; B22; B22F; B22F7/00; B22F7/06; E; E21; E21B; E21B10/00; E21B10/46; B22F5/00; B22F2005/001; Y; Y10; Y10S; Y10S76/00; Y10S76/11; Y10S76/12; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12021; Y10T428/12458
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
150 words
A process for the production of a rotary drill bit matrix coated with a hardfacing layer comprising the steps of: (a) forming a hollow mold for molding at least a portion of the drill bit; (b) providing one or more displacement elements corresponding to features to be formed on and within the bit; (c) applying adhesive and hardfacing material to the interior surfaces of said mold and the exterior surfaces of said displacement elements, said adhesive being effective to hold said hardfacing material in place; (d) positioning a bit blank at least partially within said mold; (e) packing said mold with a filler material; (f) infiltrating said filler material and said hardfacing material on said mold and displacement element with a binder in a furnace to form said bit; and (g) removing said displacement elements to form said features having a coating of said hardfacing material on the surfaces thereof.
Claim 2
Dependent Claim
150 words
A process for the production of a rotary drill bit matrix coated with a hardfacing layer comprising the steps of: (a) forming a hollow mold for molding at least a portion of the drill bit; (b) providing one or more displacement elements corresponding to features to be formed on and within the bit; (c) applying adhesive and hardfacing material to the interior surfaces of said mold and the exterior surfaces of said displacement elements, said adhesive being effective to hold said hardfacing material in place; (d) positioning a bit blank at least partially within said mold; (e) packing said mold with a filler material; (f) infiltrating said filler material and said hardfacing material on said mold and displacement element with a binder in a furnace to form said bit; and (g) removing said displacement elements to form said features having a coating of said hardfacing material on the surfaces thereof.
Claim 3
Dependent Claim
22 words
The process of claim 1 in which step (c) is repeated to build up the thickness of the layer of hardfacing material.
Claim 4
Dependent Claim
16 words
The process of claim 2 in which steps (c) is repeated from 10 to 30 times.
Claim 5
Dependent Claim
18 words
The process of claim 1 in which said hardfacing material is mixed with said adhesive prior to application.
Claim 6
Dependent Claim
30 words
The process of claim 4 in which the mixture of adhesive and hardfacing material is sprayed onto the interior surfaces of said mold and exterior surfaces of said displacement elements.
Claim 7
Dependent Claim
20 words
The process of claim 1 in which said adhesive is applied first, followed by the application of said hardfacing material.
Claim 8
Dependent Claim
18 words
The process of claim 1 in which said layer is between about 0.01 to about 0.25 inches thick.
Claim 9
Dependent Claim
18 words
The process of claim 4 in which said layer is between about 0.10 to about 0.25 inches thick.
Claim 10
Dependent Claim
14 words
The process of claim 1 in which said adhesive is a pressure sensitive adhesive.
Claim 11
Dependent Claim
22 words
The process of claim 6 in which said adhesive is selected from the group consisting of solvent-based adhesives and water based adhesives.
Claim 12
Dependent Claim
18 words
The process of claim 6 in which said adhesive is sprayed onto said interior surfaces of said mold.
Claim 13
Dependent Claim
19 words
The process of claim 6 in which said adhesive is sprayed onto the exterior surfaces of said displacement elements.
Claim 14
Dependent Claim
18 words
The process of claim 1 in which said hardfacing material comprises tungsten carbide, boron nitride, or silicon carbide.
Claim 15
Dependent Claim
23 words
The process of claim 2 in which increasing amounts of filler material are added to said hardfacing material as step (c) is repeated.
Claim 16
Dependent Claim
19 words
The process of claim 2 in which the applications of hardfacing material are alternated with applications of filler material.
Claim 17
Dependent Claim
20 words
The process of claim 2 which includes the step of applying a binder along with the applications of hardfacing material.
Claim 18
Dependent Claim
18 words
The process of claim 1 in which the thickness of said layer of hardfacing material is substantially uniform.
Claim 19
Dependent Claim
137 words
A process for the production of a rotary drill bit coated with a layer of hardfacing material on the exterior surface thereof comprising the steps of: (a) forming a hollow mold for molding at least a portion of the drill bit; (b) applying an adhesive and a hardfacing material to the interior surfaces of said mold, said adhesive layer being effective to hold said hardfacing material in place; (c) repeating step (b) to build up the thickness of the layer of hardfacing material; (d) positioning a bit blank at least partially within said mold; (e) packing said mold with a filler material; (f) infiltrating said filler material and said hardfacing material on said mold with a binder in a furnace to form said bit; and (g) removing said bit surfaced with said hardfacing material from said mold.
Claim 20
Dependent Claim
137 words
A process for the production of a rotary drill bit coated with a layer of hardfacing material on the exterior surface thereof comprising the steps of: (a) forming a hollow mold for molding at least a portion of the drill bit; (b) applying an adhesive and a hardfacing material to the interior surfaces of said mold, said adhesive layer being effective to hold said hardfacing material in place; (c) repeating step (b) to build up the thickness of the layer of hardfacing material; (d) positioning a bit blank at least partially within said mold; (e) packing said mold with a filler material; (f) infiltrating said filler material and said hardfacing material on said mold with a binder in a furnace to form said bit; and (g) removing said bit surfaced with said hardfacing material from said mold.
Claim 21
Dependent Claim
18 words
The process of claim 18 in which the thickness of said layer of hardfacing material is substantially uniform.
Claim 22
Dependent Claim
16 words
The process of claim 19 in which step (b) is repeated from 10 to 30 times.
Claim 23
Dependent Claim
18 words
The process of claim 18 in which said hardfacing material is mixed with said adhesive prior to application.
Claim 24
Dependent Claim
23 words
The process of claim 21 in which the mixture of adhesive and hardfacing material is sprayed onto the interior surfaces of said mold.
Claim 25
Dependent Claim
20 words
The process of claim 18 in which said adhesive is applied first, followed by the application of said hardfacing material.
Claim 26
Dependent Claim
18 words
The process of claim 18 in which said layer is between about 0.10 to about 0.25 inches thick.
Claim 27
Dependent Claim
14 words
The process of claim 18 in which said adhesive is a pressure sensitive adhesive.
Claim 28
Dependent Claim
21 words
The process of claim 25 in which said adhesive is selected from the group consisting of solvent-based adhesives and water-based adhesives.
Claim 29
Dependent Claim
18 words
The process of claim 23 in which said adhesive is sprayed onto said interior surfaces of said mold.
Claim 30
Dependent Claim
19 words
The process of claim 18 in which the applications of hardfacing material are alternated with applications of filler material.
Claim 31
Dependent Claim
20 words
The process of claim 18 which includes the step of applying a binder along with the applications of hardfacing material.
Claim 32
Dependent Claim
66 words
A process for the production of a layer of hardfacing material on the exterior surfaces of a displacement part comprising the steps of: (a) applying an adhesive and a hardfacing material to the exterior surfaces of said displacement part, said adhesive being effective to hold said hardfacing material in place; and (b) repeating step (a) to build up the thickness of the layer of hardfacing material.
Claim 33
Dependent Claim
66 words
A process for the production of a layer of hardfacing material on the exterior surfaces of a displacement part comprising the steps of: (a) applying an adhesive and a hardfacing material to the exterior surfaces of said displacement part, said adhesive being effective to hold said hardfacing material in place; and (b) repeating step (a) to build up the thickness of the layer of hardfacing material.
Claim 34
Dependent Claim
18 words
The process of claim 30 in which the thickness of said layer of hardfacing material is substantially uniform.
Claim 35
Dependent Claim
18 words
The process of claim 31 in which steps (a) and (b) are repeated from 10 to 30 times.
Claim 36
Dependent Claim
18 words
The process of claim 30 in which said hardfacing material is mixed with said adhesive prior to application.
Claim 37
Dependent Claim
24 words
The process of claim 33 in which the mixture of adhesive and hardfacing material is sprayed onto the exterior surfaces of said displacement part.
Claim 38
Dependent Claim
20 words
The process of claim 30 in which said adhesive is applied first, followed by the application of said hardfacing material.
Claim 39
Dependent Claim
18 words
The process of claim 30 in which said layer is between about 0.10 to about 0.25 inches thick.
Claim 40
Dependent Claim
14 words
The process of claim 30 in which said adhesive is a pressure sensitive adhesive.
Claim 41
Dependent Claim
21 words
The process of claim 37 in which said adhesive is selected from the group consisting of solvent-based adhesives and water-based adhesives.
Claim 42
Dependent Claim
19 words
The process of claim 35 in which said adhesive is sprayed onto said exterior surfaces of said displacement part.
Claim 43
Dependent Claim
19 words
The process of claim 30 in which the applications of hardfacing material are alternated with applications of filler material.
Claim 44
Dependent Claim
20 words
The process of claim 30 which includes the step of applying a binder along with the applications of hardfacing material.
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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) | 1992-12-04 | 1993-06-05 | 1993-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-04 | 1997-06-05 | 1997-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-04 | 2001-06-05 | 2001-12-05 | $7700.00 | Window Closed / Lapsed |