US3915246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary drilling bit
Assignee: TRI-MAX Corp A CORP OF DE
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Filing: 1974-05-16
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Granted: 1975-10-28
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Expires: 1994-05-16
Abstract
Abstract The specification discloses a rotary drill bit having a drill body with a full gauge upper stabilizer section and an intermediate taper section tapering to a reduced diameter from the stabilizer section. The drill body further includes a lower nose section extending downwardly from the reduced diameter of the taper section. A plurality of vertical grooves are spaced apart about the body and extend from the nose section to the stabilizer section for allowing upward flow of rock cut by the nose section. The width of the vertical groove increases from the nose section to the stabilizer section. A plurality of spaced apart transverse grooves extend around the body to provide stress relief areas to assist in rock failure and to insure proper cleaning of the cutting edge of the bit. The vertical and transverse grooves intersect to provide generally rectangular areas over the body. There is an arrangement of the jet apertures in the body. A plurality of discrete cutting members extend outwardly from the rectangular areas. A set of the cutting members are arranged about the surface of the body in a generally helical spiral and extend outwardly further from the surface of the body than the remainder of the cutting members. The specification further discloses one embodiment of the invention including smaller jet apertures in the body and a valve to prevent bouyancy of the bit during lowering of the bit and to allow draining of fluid from the bit prior to raising the bit.
Inventors
- 👤 Adel E Sheshtawy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 21:36
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/60; E21B10/46; E21B10/56; E21B21/00; E21B21/10
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
181 words
A rotary drill bit comprising: a drill body having a full gauge upper stabilizer section and an intermediate taper section tapering to a reduced diameter from said stabilizer section, said intermediate taper section extending along a significant portion of the length of said body such that the side view of said body has the general configuration of an inverted triangle, said drill body further including a lower outwardly curved nose section, a plurality of vertical grooves spaced apart about said body and extending from said nose section to said stabilizer section for allowing upward flow of rock cut by said nose section, a plurality of spaced apart transverse grOoves extending around said body to provide stress relief areas to assist in rock failure, said vertical and transverse grooves intersecting to provide generally rectangular areas over said body, the width of said rectangular areas being substantially greater than the width of said vertical grooves such that the majority of the surface area of said drill body comprises cutting surfaces, and a plurality of discrete cutting members extending outwardly from said rectangular areas.
Claim 2
Dependent Claim
181 words
A rotary drill bit comprising: a drill body having a full gauge upper stabilizer section and an intermediate taper section tapering to a reduced diameter from said stabilizer section, said intermediate taper section extending along a significant portion of the length of said body such that the side view of said body has the general configuration of an inverted triangle, said drill body further including a lower outwardly curved nose section, a plurality of vertical grooves spaced apart about said body and extending from said nose section to said stabilizer section for allowing upward flow of rock cut by said nose section, a plurality of spaced apart transverse grOoves extending around said body to provide stress relief areas to assist in rock failure, said vertical and transverse grooves intersecting to provide generally rectangular areas over said body, the width of said rectangular areas being substantially greater than the width of said vertical grooves such that the majority of the surface area of said drill body comprises cutting surfaces, and a plurality of discrete cutting members extending outwardly from said rectangular areas.
Claim 3
Dependent Claim
24 words
The drill bit of claim 1 and further comprising: an increased density of said cutting members being disposed on said outwardly curved nose section.
Claim 4
Dependent Claim
21 words
The drill bit of claim 1 wherein said vertical grooves increase in width from said nose section to said stabilizer section.
Claim 5
Dependent Claim
32 words
The drill bit of claim 1 wherein the width of said transverse grooves disposed adjacent said stabilizer section is greater than the width of said transverse grooves disposed adjacent said nose section.
Claim 6
Dependent Claim
15 words
The drill bit of claim 1 wherein the cross section of said grooves is semi-circular.
Claim 7
Dependent Claim
25 words
The drill bit of claim 1 wherein said cutting members have different sizes and are disposed with varying densities on ones of said rectangular areas.
Claim 8
Dependent Claim
21 words
The drill bit of claim 1 and further comprising: discrete cutting members disposed on the following sides of said vertical grooves.
Claim 9
Dependent Claim
32 words
The drill bit of claim 1 wherein ones of said cutting members are disposed about a spiral path over said body member and are longer than the remainder of said cutting members.
Claim 10
Dependent Claim
76 words
A drill bit comprising: a body member having means for connection to the lower end of a rotary drill string, a plurality of cutting members extending outwardly from the surface of said body member, a set of said cutting members extending outwardly further from the surface of said body member than the remainder of said cutting members, said set of cutting members being arranged around the surface of said body member in a generally helical spiral.
Claim 11
Dependent Claim
76 words
A drill bit comprising: a body member having means for connection to the lower end of a rotary drill string, a plurality of cutting members extending outwardly from the surface of said body member, a set of said cutting members extending outwardly further from the surface of said body member than the remainder of said cutting members, said set of cutting members being arranged around the surface of said body member in a generally helical spiral.
Claim 12
Dependent Claim
34 words
The drill bit of claim 9 and further comprising: vertical and transverse grooves extending over said body member to form rectangular areas over said body member, said cutting members formed on said rectangular areas.
Claim 13
Dependent Claim
23 words
The drill bit of claim 9 wherein said cutting members have different sizes and are disposed over said body member in different densities.
Claim 14
Dependent Claim
142 words
A rotary jet drill comprising: a body member having means for connection to the lower end of a rotary drill string, said body member tapering downwardly from a full gauge stabilizer section to a narrow outwardly curved nose section to form a triangular side configuration, a central opening through said bit communicating with a plurality of jet apertures formed in the exterior of said body member between said stabilizer and nose sections, a plurality of vertical grooves extending between said stabilizer and nose sections and increasing in width from said nose section to said stabilizer section, a plurality of circular transverse grooves formed about said body member, the width of said transverse grooves adjacent said stabilizer section being greater than the width of said transverse grooves adjacent said nose section, and discrete cutting members disposed on said body member between said grooves.
Claim 15
Dependent Claim
142 words
A rotary jet drill comprising: a body member having means for connection to the lower end of a rotary drill string, said body member tapering downwardly from a full gauge stabilizer section to a narrow outwardly curved nose section to form a triangular side configuration, a central opening through said bit communicating with a plurality of jet apertures formed in the exterior of said body member between said stabilizer and nose sections, a plurality of vertical grooves extending between said stabilizer and nose sections and increasing in width from said nose section to said stabilizer section, a plurality of circular transverse grooves formed about said body member, the width of said transverse grooves adjacent said stabilizer section being greater than the width of said transverse grooves adjacent said nose section, and discrete cutting members disposed on said body member between said grooves.
Claim 16
Dependent Claim
18 words
The drill bit of claim 12 and further comprising: high pressure jet nozzles mounted in said jet apertures.
Claim 17
Dependent Claim
46 words
The drill bit of claim 12 and further comprising: valve means mounted in said nose section for allowing fluid to enter said drill string when said bit is being lowered and for allowing fluid to drain from said drill string when said bit is being raised.
Claim 18
Dependent Claim
44 words
The drill bit of claim 12 and further comprising: a shank disposed on the upper end of said bit, key slots being formed in said shank, and block means having keys for interfitting about said shank for connecting said bit to the drill string.
Claim 19
Dependent Claim
161 words
A rotary jet drill bit comprising: a body member having means for connection to the lower end of a rotary drill string, said body member tapering downwardly from a full gauge stabilizer section to a narrow outwardly curved nose section to form a triangular side configuration, a central opening through said bit communicating with a plurality of jet apertures formed in the exterior of said body member between said stabilizer and nose sections, a plurality of vertical grooves extending between said stabilizer and nose sections and increasing in width from said nose section to said stabilizer section, a plurality of circular transverse grooves formed about said body member, the width of said transverse grooves adjacent said stabilizer section being greater than the width of said transverse grooves adjacent said nose section, discrete cutting members disposed on said body member between said grooves, and ones of said cutting members being disposed in a spiral about said body members and having increased lengths.
Claim 20
Dependent Claim
161 words
A rotary jet drill bit comprising: a body member having means for connection to the lower end of a rotary drill string, said body member tapering downwardly from a full gauge stabilizer section to a narrow outwardly curved nose section to form a triangular side configuration, a central opening through said bit communicating with a plurality of jet apertures formed in the exterior of said body member between said stabilizer and nose sections, a plurality of vertical grooves extending between said stabilizer and nose sections and increasing in width from said nose section to said stabilizer section, a plurality of circular transverse grooves formed about said body member, the width of said transverse grooves adjacent said stabilizer section being greater than the width of said transverse grooves adjacent said nose section, discrete cutting members disposed on said body member between said grooves, and ones of said cutting members being disposed in a spiral about said body members and having increased lengths.
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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |