US3645346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Erosion drilling
Assignee: ExxonMobil Upstream Research Co
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Filing: 1970-04-29
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Granted: 1972-02-29
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Expires: 1990-04-29
Abstract
Abstract An erosion bit for earth-drilling operations having a first nozzle system open for conducting drilling fluid and a second nozzle system closed by a pressure-sensitive closure means. Means are provided for plugging the first nozzle system and for actuating the pressure-sensitive closure means to open the second nozzle system. Drilling fluid can initially be flowed through the first nozzle system until the nozzles become eroded and then through the second nozzle system.
Inventors
- 👤 James F Miller
- 👤 William C Maurer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:46
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/18; E21B10/00; E21B10/08; E21B10/18; E21B10/60; E21B21/00; E21B21/10; E21B21/103
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
217 words
In an apparatus for drilling boreholes using high velocity jet streams, an improved bit comprising: a body adapted to be connected to the lower end of a tubular drill string; a first nozzle system including a first set of nozzles secured to the body and flow passage means formed in the body providing fluid communication between the drill string and each of said nozzles, said first set of nozzles being arranged on said body to provide a distributed jet pattern as said bit is rotated and fluid is flowed through said first nozzle system; a second nozzle system including a second set of nozzles secured to the body and flow passage means formed in the body providing fluid communication between the drill string and each of the nozzles of said second set, said second set of nozzles being arranged on said body to provide a distributed jet pattern as said bit is rotated and fluid is flowed through said second nozzle system; closure means disposed in said second nozzle system for preventing the flow of fluid therethrough, said closure means being rendered inoperative in response to the application of a predetermined pressure in the drill string; and means passable through the drill string and adapted to lodge in said bit body to close said first nozzle system.
Claim 2
Dependent Claim
217 words
In an apparatus for drilling boreholes using high velocity jet streams, an improved bit comprising: a body adapted to be connected to the lower end of a tubular drill string; a first nozzle system including a first set of nozzles secured to the body and flow passage means formed in the body providing fluid communication between the drill string and each of said nozzles, said first set of nozzles being arranged on said body to provide a distributed jet pattern as said bit is rotated and fluid is flowed through said first nozzle system; a second nozzle system including a second set of nozzles secured to the body and flow passage means formed in the body providing fluid communication between the drill string and each of the nozzles of said second set, said second set of nozzles being arranged on said body to provide a distributed jet pattern as said bit is rotated and fluid is flowed through said second nozzle system; closure means disposed in said second nozzle system for preventing the flow of fluid therethrough, said closure means being rendered inoperative in response to the application of a predetermined pressure in the drill string; and means passable through the drill string and adapted to lodge in said bit body to close said first nozzle system.
Claim 3
Dependent Claim
31 words
The invention as recited in claim 1 wherein said flow passage of said second system includes a common header and said closure means includes a member disposed across said common header.
Claim 4
Dependent Claim
25 words
The invention as recited in claim 1 wherein said closure means includes a rupture disc mounted in each of the nozzles of said second set.
Claim 5
Dependent Claim
106 words
The invention as recited in claim 1 wherein said first and second flow passages include a common central chamber extending partially through said body, said central chamber being configurated to provide valve seating means therein, said second flow passage extending from said central chamber upstream of said valve seating means to saiD second set of nozzles, said first flow passage extending from said central chamber downstream of said valve seating means to said first set of nozzles and said means for closing said first nozzle system includes a valve member passable through said drill string into said central chamber and seatable on said valve seating means.
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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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |