US3845830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making high penetration rate drill bits and two bits made thereby
Assignee: Texaco Inc
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Filing: 1973-02-22
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Granted: 1974-11-05
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Expires: 1993-02-22
Abstract
Abstract A method for forming a drill bit for drilling through either consolidated or unconsolidated sedimentary sections comprises (1) forming a recess in the bottom cutting surface of the drill bit, and (2) shaping the recessed cutting surface into a continuous non-cylindrical surface of revolution having a height to radius ratio of substantially three to one. Two other methods are disclosed. A preferred drill bit made by the method has a conical recess, and another has a paraboloidal recess, each recess having a vertex and a plurality of exit transverse passages. The exit passages have spaced apart inlet openings around their vertex, one modification having the openings spaced from each other around its vertex and another having the openings tangent to each other around its vertex for forming a very efficient and high penetration rate drill bit.
Inventors
- 👤 J Fowler
- 👤 J Bryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:24
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/02; E21B10/04
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
86 words
A method for forming a high penetration rate drill bit wherein the drill bit has a bottom cutting surface comprising the steps of, a. forming a recess in the bottom cutting surface of the drill bit, the recess having a height and a circular base with a radius, b. shaping the bottom cutting surface recess to a continuous non-cylindrical surface of revolution having a height to radius ratio of substantially three-to-one, and c. shaping the drill bit bottom non-cylindrical surface of revolution into a paraboloidal shape.
Claim 2
Independent Claim
86 words
A method for forming a high penetration rate drill bit wherein the drill bit has a bottom cutting surface comprising the steps of, a. forming a recess in the bottom cutting surface of the drill bit, the recess having a height and a circular base with a radius, b. shaping the bottom cutting surface recess to a continuous non-cylindrical surface of revolution having a height to radius ratio of substantially three-to-one, and c. shaping the drill bit bottom non-cylindrical surface of revolution into a paraboloidal shape.
Claim 3
Independent Claim
138 words
A method for forming a high penetration rate drill bit wherein the drill bit has a bottom cutting surface comprising the steps of, a. forming a recess in the bottom cutting surface of the drill bit, the recess having a height and a circular base with a radius, b. shaping the bottom cutting surface recess to a continuous non-cylindrical surface of revolution having a height to radius ratio of substantially three-to-one, c. shaping an annulus on the periphery of the drill bit bottom cutting surface of a particular area, d. shaping the surface of the recess internally of the annulus into a cutting surface area substantially greater than the cutting surface area of the annulus for forming a higher penetration rate drill bit, and e. shaping the drill bit bottom non-cylindrical surface of revolution into a paraboloidal shape.
Claim 4
Independent Claim
138 words
A method for forming a high penetration rate drill bit wherein the drill bit has a bottom cutting surface comprising the steps of, a. forming a recess in the bottom cutting surface of the drill bit, the recess having a height and a circular base with a radius, b. shaping the bottom cutting surface recess to a continuous non-cylindrical surface of revolution having a height to radius ratio of substantially three-to-one, c. shaping an annulus on the periphery of the drill bit bottom cutting surface of a particular area, d. shaping the surface of the recess internally of the annulus into a cutting surface area substantially greater than the cutting surface area of the annulus for forming a higher penetration rate drill bit, and e. shaping the drill bit bottom non-cylindrical surface of revolution into a paraboloidal shape.
Claim 5
Independent Claim
135 words
A method for forming a high penetration rate drill bit wherein the drill bit has a bottom cutting surface comprising the steps of, a. forming a recess in the bottom cutting surface of the drill bit, the recess having a height and a circular base with a radiUs, b. shaping the bottom cutting surface recess to a continuous non-cylindrical surface of revolution having a height to radius ratio of substantially three-to-one, c. forming drilling fluid exit transverse passages in the bottom cutting surface recess leaving non-cutting surface areas for the fluid exits, d. forming the remaining bottom cutting surface area to be the major surface area relative to the non-cutting surface area for forming a high penetration rate drill bit, and e. shaping the drill bit bottom non-cylindrical surface of revolution into a paraboloidal shape.
Claim 6
Independent Claim
135 words
A method for forming a high penetration rate drill bit wherein the drill bit has a bottom cutting surface comprising the steps of, a. forming a recess in the bottom cutting surface of the drill bit, the recess having a height and a circular base with a radiUs, b. shaping the bottom cutting surface recess to a continuous non-cylindrical surface of revolution having a height to radius ratio of substantially three-to-one, c. forming drilling fluid exit transverse passages in the bottom cutting surface recess leaving non-cutting surface areas for the fluid exits, d. forming the remaining bottom cutting surface area to be the major surface area relative to the non-cutting surface area for forming a high penetration rate drill bit, and e. shaping the drill bit bottom non-cylindrical surface of revolution into a paraboloidal shape.
Claim 7
Independent Claim
95 words
A method for forming a better drill bit comprising the steps of, a. forming a cutting surface over the bottom of the drill bit in one continuous non-cylindrical surface of revolution, b. forming an annulus on the periphery of the drill bit bottom cutting surface of a particular area, c. forming a recess internally of the annulus having a cutting surface area substantially greater than the cutting surface area of the annulus, and d. shaping the drill bit bottom non-cylindrical surface of revolution into a paraboloidal shape for forming a higher penetration rate drill bit.
Claim 8
Independent Claim
95 words
A method for forming a better drill bit comprising the steps of, a. forming a cutting surface over the bottom of the drill bit in one continuous non-cylindrical surface of revolution, b. forming an annulus on the periphery of the drill bit bottom cutting surface of a particular area, c. forming a recess internally of the annulus having a cutting surface area substantially greater than the cutting surface area of the annulus, and d. shaping the drill bit bottom non-cylindrical surface of revolution into a paraboloidal shape for forming a higher penetration rate drill bit.
Claim 9
Dependent Claim
71 words
A high penetration rate rotary drill bit having a bottom cutting surface comprising, a. a recess in the bottom cutting surface, said recess having a height and a circular base with a radius, b. said bottom cutting surface recess has a continuous non-cylindrical surface of revolution shape having a height to radius ratio of substantially three-to-one, and c. said bottom cutting surface non-cylindrical surface of revolution shape is a paraboloidal shape.
Claim 10
Dependent Claim
71 words
A high penetration rate rotary drill bit having a bottom cutting surface comprising, a. a recess in the bottom cutting surface, said recess having a height and a circular base with a radius, b. said bottom cutting surface recess has a continuous non-cylindrical surface of revolution shape having a height to radius ratio of substantially three-to-one, and c. said bottom cutting surface non-cylindrical surface of revolution shape is a paraboloidal shape.
Claim 11
Dependent Claim
118 words
A high penetration rate rotary drill bit having a bottom cutting surface comprising, a. a recess in the bottom cutting surface, said recess having a height and a circular base with a radius, b. said bottom cutting surface recess has a continuous non-cylindrical surface of revolution shape having a height to radius ratio of substantially three-to-one, and c. said bottom cutting surface has an annulus around said recess of a particular area, d. the cutting surface area of the recess internally of the annulus is substantially greater than the cutting surface area of said annulus for providing a higher penetration rate drill bit, and e. said bottom cutting surface non-cylindrical surface of revolution shape is a paraboloidal shape.
Claim 12
Dependent Claim
118 words
A high penetration rate rotary drill bit having a bottom cutting surface comprising, a. a recess in the bottom cutting surface, said recess having a height and a circular base with a radius, b. said bottom cutting surface recess has a continuous non-cylindrical surface of revolution shape having a height to radius ratio of substantially three-to-one, and c. said bottom cutting surface has an annulus around said recess of a particular area, d. the cutting surface area of the recess internally of the annulus is substantially greater than the cutting surface area of said annulus for providing a higher penetration rate drill bit, and e. said bottom cutting surface non-cylindrical surface of revolution shape is a paraboloidal shape.
Claim 13
Dependent Claim
94 words
A drill bit comprising, a. a drill bit having one continuous non-cylindrical surface of revolution cutting surface over the bottom thereof, b. said cutting surface having an annulus on the periphery of the drill bit bottom covering a particular area thereof, c. said cutting surface having a recess formed internally of the annulus, d. said recess having a cutting surface area substantially greater than the cutting surface area of the annulus, and e. said bottom cutting surface non-cylindrical surface of revolution shape is a paraboloidal shape for forming a higher penetration rate drill bit.
Claim 14
Dependent Claim
94 words
A drill bit comprising, a. a drill bit having one continuous non-cylindrical surface of revolution cutting surface over the bottom thereof, b. said cutting surface having an annulus on the periphery of the drill bit bottom covering a particular area thereof, c. said cutting surface having a recess formed internally of the annulus, d. said recess having a cutting surface area substantially greater than the cutting surface area of the annulus, and e. said bottom cutting surface non-cylindrical surface of revolution shape is a paraboloidal shape for forming a higher penetration rate drill bit.
Claim 15
Dependent Claim
62 words
A drill bit as recited in claim 7 wherein, a. said drill bit has drilling fluid exit transverse passages in said cutting surface recess area forming noncutting surface areas for exit of the drilling fluid, and b. the remaining cutting surface area being the major cutting surface area relative to the noncutting surface area for providing a high penetration rate drill bit.
Claim 16
Dependent Claim
23 words
A drill bit as recited in claim 8 wherein, a. said cutting surface recess area has a vertex at its highest point, and
Claim 17
Dependent Claim
160 words
A drill bit comprising, a. a drill bit having one continuous non-cylindrical surface of revolution cutting surface over the bottom thereof, b. said cutting surface having an annulus on the periphery of the drill bit bottom covering a particular area thereof, c. said cutting surface having a recess formed internally of the annulus, d. said recess having a cutting surface area substantially greater than the cutting surface area of the annulus, e. said drill bit has drilling fluid exit transverse passages in said cutting surface recess area forming non-cutting surface areas for exit of the drilling fluid, f. the remaining cutting surface area being the major cutting surface area relative to the non-cutting surface area, g. said cutting surface recess area has a vertex at its highest point, and h. said drilling fluid exit transverse passages each has spaced apart openings around said vertex of said recess area in the cutting surface for providing a high penetration rate drill bit.
Claim 18
Dependent Claim
160 words
A drill bit comprising, a. a drill bit having one continuous non-cylindrical surface of revolution cutting surface over the bottom thereof, b. said cutting surface having an annulus on the periphery of the drill bit bottom covering a particular area thereof, c. said cutting surface having a recess formed internally of the annulus, d. said recess having a cutting surface area substantially greater than the cutting surface area of the annulus, e. said drill bit has drilling fluid exit transverse passages in said cutting surface recess area forming non-cutting surface areas for exit of the drilling fluid, f. the remaining cutting surface area being the major cutting surface area relative to the non-cutting surface area, g. said cutting surface recess area has a vertex at its highest point, and h. said drilling fluid exit transverse passages each has spaced apart openings around said vertex of said recess area in the cutting surface for providing a high penetration rate drill bit.
Claim 19
Dependent Claim
23 words
A drill bit as recited in claim 10 wherein, a. said spaced apart openings around said vertex area are tangent to each other.
Claim 20
Dependent Claim
80 words
A high penetration rate drill bit comprising, a. a drill bit having one continuous noncylindrical surface of revolution cutting surface over the bottom thereof, b. said cutting surface having therein a recess area with a vertex in the middle thereof, c. drilling fluid exit transverse passages in said cutting surface recess area for exit of the drilling fluid, and d. said drilling fluid exit transverse passages each has spaced apart openings around said vertex of said cutting surface recess area.
Claim 21
Dependent Claim
80 words
A high penetration rate drill bit comprising, a. a drill bit having one continuous noncylindrical surface of revolution cutting surface over the bottom thereof, b. said cutting surface having therein a recess area with a vertex in the middle thereof, c. drilling fluid exit transverse passages in said cutting surface recess area for exit of the drilling fluid, and d. said drilling fluid exit transverse passages each has spaced apart openings around said vertex of said cutting surface recess area.
Claim 22
Dependent Claim
23 words
A drill bit as recited in claim 12 wherein, a. said spaced apart openings around said vertex area are tangent to each other.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |