Patent US3552412A successfully refreshed from Google Patents.
US3552412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill string dump valve
Assignee: Individual
•
Filing: 1967-10-19
•
Granted: 1971-01-05
•
Expires: 1987-10-19
Abstract
Abstract The invention comprises an improved drill string dump valve comprising a moveable member having a downwardly and outwardly sloping sealing surface. The valve comprises structure to permit the moveable member with its operating member thereon to fall free and unrestricted downwardly away from the relief ports.
Inventors
- 👤 Donald K Hagar
- 👤 Joseph L Pekarek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:18
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; E21B21/103; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1632; Y10T137/1782
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
306 words
A drill string dump valve comprising a valve body formed with a through passageway for the passage of fluids therethrough from an upper end to a lower end when said valve is vertically disposed, said passageway comprising a downwardly expanding section, said body being formed with an opening communicating said section of said passageway with the outside of said body, means to releasably seal said opening at said sectioN against the flow of fluids therethrough, said section of said passageway comprising an upper smallest cross-sectional area and a lower largest cross-sectional area, said releasable sealing means comprising a valve member moveable within said passageway and adapted to close said opening, said valve member comprising an upper smallest cross-sectional area adapted to fit snugly within said upper smallest cross-sectional area of said section and a lower largest cross-sectional area which is a predetermined amount smaller than said lower largest cross-sectional area of said section, whereby said valve member may move freely down and away from said opening to open said opening for fluid flow, said releasable sealing means comprising an operating member adapted to pass down through the inside of the drill string to contact said moveable valve member, said passageway comprising a throat portion extending upwardly from said upper smallest crosssectional area thereof and adapted to guide said operating member into sealing relation with said valve member, said releasable sealing means comprising a plurality of shear bolts passing through the wall of said valve body and the wall of said valve member to hold said valve member in sealing relation with said opening, said bolts being formed with a bolt head portion positioned on the inside surface of said valve member, and means to form a fluid tight seal at the zone of contact between said bolt head and the inside surface of said valve member.
Claim 2
Dependent Claim
306 words
A drill string dump valve comprising a valve body formed with a through passageway for the passage of fluids therethrough from an upper end to a lower end when said valve is vertically disposed, said passageway comprising a downwardly expanding section, said body being formed with an opening communicating said section of said passageway with the outside of said body, means to releasably seal said opening at said sectioN against the flow of fluids therethrough, said section of said passageway comprising an upper smallest cross-sectional area and a lower largest cross-sectional area, said releasable sealing means comprising a valve member moveable within said passageway and adapted to close said opening, said valve member comprising an upper smallest cross-sectional area adapted to fit snugly within said upper smallest cross-sectional area of said section and a lower largest cross-sectional area which is a predetermined amount smaller than said lower largest cross-sectional area of said section, whereby said valve member may move freely down and away from said opening to open said opening for fluid flow, said releasable sealing means comprising an operating member adapted to pass down through the inside of the drill string to contact said moveable valve member, said passageway comprising a throat portion extending upwardly from said upper smallest crosssectional area thereof and adapted to guide said operating member into sealing relation with said valve member, said releasable sealing means comprising a plurality of shear bolts passing through the wall of said valve body and the wall of said valve member to hold said valve member in sealing relation with said opening, said bolts being formed with a bolt head portion positioned on the inside surface of said valve member, and means to form a fluid tight seal at the zone of contact between said bolt head and the inside surface of said valve member.
Claim 3
Dependent Claim
58 words
The combination of claim 1, said last-mentioned sealing means comprising a washer formed of ductile material adapted to be seated in a recess formed on the inside surface of said valve member to receive said washer, whereby tightening of said bolt will cause said head to deform said washer in said recess to form said fluid tight seal.
Claim 4
Dependent Claim
26 words
The combination of claim 1, said opening comprising plug means to protect said releasable sealing means against the flow of well fluids inwardly through said opening.
Claim 5
Dependent Claim
29 words
The combination of claim 3, said plug means comprising an aluminum disc seated in a counterbore extending inwardly from the outside surface of the body of said dump valve.
Claim 6
Dependent Claim
113 words
The combination of claim 1, said releasable sealing means comprising an operating member adapted to pass down through the inside of the drill string to contact said moveable valve member whereby increased pressure on the fluid in said drill string above said operating member will break said shear bolts and permit said moveable valve member with said operating member thereon to move freely downwardly, and said passageway being formed with a space below said opening sufficiently long to receive said moveable valve member and said operating member and to locate said moveable valve member and said operating member below said opening after said moveable valve member has moved down away from said opening.
Claim 7
Dependent Claim
232 words
A drill string dump valve comprising a valve body formed with a through passageway for the passage of fluids therethrough from an upper end to a lower end when said valve is vertically disposed, said passageway comprising a downwardly expanding section, said body being formed with an opening communicating said section of said passageway with the outside of said body, means to releasably seal said opening at said section against the flow of fluids therethrough, said section of said passageway comprising an upper smallest cross-sectional area and a lower largest cross-sectional area, said releasable sealing means comprising a valve member moveable within said passageway and adapted to close said opening, said valve member comprising an upper smallest cross-sectional area adapted to fit snugly within said upper smallest cross-sectional area of said section and a lower largest cross-sectional area which is a predetermined amount smaller than said lower largest cross-sectional area of said section, whereby said valve member may move freely down and away from said opening to open said opening for fluid flow, said passagewaY comprising a throat portion extending upwardly from said smallest cross-sectional area thereof, said moveable valve member comprising a throat portion extending upwardly from said upper smallest cross-sectional area thereof a predetermined distance into said throat portion of said passageway, and sealing means between said throat portion of said passageway and said throat portion of said valve member.
Claim 8
Dependent Claim
232 words
A drill string dump valve comprising a valve body formed with a through passageway for the passage of fluids therethrough from an upper end to a lower end when said valve is vertically disposed, said passageway comprising a downwardly expanding section, said body being formed with an opening communicating said section of said passageway with the outside of said body, means to releasably seal said opening at said section against the flow of fluids therethrough, said section of said passageway comprising an upper smallest cross-sectional area and a lower largest cross-sectional area, said releasable sealing means comprising a valve member moveable within said passageway and adapted to close said opening, said valve member comprising an upper smallest cross-sectional area adapted to fit snugly within said upper smallest cross-sectional area of said section and a lower largest cross-sectional area which is a predetermined amount smaller than said lower largest cross-sectional area of said section, whereby said valve member may move freely down and away from said opening to open said opening for fluid flow, said passagewaY comprising a throat portion extending upwardly from said smallest cross-sectional area thereof, said moveable valve member comprising a throat portion extending upwardly from said upper smallest cross-sectional area thereof a predetermined distance into said throat portion of said passageway, and sealing means between said throat portion of said passageway and said throat portion of said valve member.
References Cited (Backward Citations)
US602378A
Cited
US2196658A
Cited
US2493650A
Cited
US2659438A
Cited
US2651367A
Cited
US3013612A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |