US3706348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well deviation control system
Assignee: Shell USA Inc
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Filing: 1971-12-06
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Granted: 1972-12-19
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Expires: 1991-12-06
Abstract
Abstract A system for controlling hole deviation through the use of a bit and a composite drill string comprising a heavy drill collar disposed above the bit and conventional steel collars above the heavy metal collar.
Inventors
- 👤 Carey E Murphey Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:55
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/10; E21B17/00; E21B17/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
119 words
Apparatus for controlling borehole deviation when drilling a borehole, said apparatus comprising: a drill bit; and a heavy metal drill collar unit having substantially twice the density of steel, said heavy metal drill collar unit being a load carrying member, and having first coupling means disposed at the lower end of said heavy metal drill collar for coupling said drill bit to said heavy metal drill collar unit, and having second coupling means disposed at the upper end of said heavy metal drill collar for coupling a collar section to said heavy metal drill collar unit whereby said heavy metal drill collar acts as a structural member for transmitting a substantial portion of the load to said drill bit.
Claim 2
Dependent Claim
119 words
Apparatus for controlling borehole deviation when drilling a borehole, said apparatus comprising: a drill bit; and a heavy metal drill collar unit having substantially twice the density of steel, said heavy metal drill collar unit being a load carrying member, and having first coupling means disposed at the lower end of said heavy metal drill collar for coupling said drill bit to said heavy metal drill collar unit, and having second coupling means disposed at the upper end of said heavy metal drill collar for coupling a collar section to said heavy metal drill collar unit whereby said heavy metal drill collar acts as a structural member for transmitting a substantial portion of the load to said drill bit.
Claim 3
Dependent Claim
63 words
The apparatus of claim 1 wherein said heavy metal drill collar unit comprises: an upper connector; a lower connector; and a heavy metal having substantially twice the density of steel, said heavy metal being connected at its upper and lower ends to said upper and lower connector whereby said heavy metal acts as a structural member of said heavy metal drill collar unit.
Claim 4
Dependent Claim
22 words
The heavy metal drill collar unit of claim 2 wherein said heavy metal is threadably connected to said upper and lower connector.
Claim 5
Dependent Claim
17 words
The heavy metal drill collar unit of claim 2 wherein said heavy metal is depleted uranium alloy.
Claim 6
Dependent Claim
15 words
The heavy metal drill collar unit of claim 2 wherein said heavy metal is tungsten.
Claim 7
Dependent Claim
36 words
The heavy metal drill collar unit of claim 2 wherein said heavy metal drill collar unit further includes inner and outer sleeve means substantially surrounding said heavy metal thereby providing corrosion protection to said heavy metal.
Claim 8
Dependent Claim
124 words
A heavy metal drill collar having a stiffness of at least one half that of a steel drill collar, said heavy metal drill collar comprising: an upper connector; a lower connector; a depleted uranium collar said collar having an inner bore therethrough, said collar being threadably connected to said upper and lower connectors at its ends, said upper and lower connectors being connected to said depleted uranium collar such that a shrink fit results; an inner sleeve extending through the inner bore of said collar, said inner sleeve being suitably connected at its ends to said upper and lower connector; and an outer sleeve surrounding said depleted uranium collar, said outer sleeve being suitably connected at its ends to said upper and lower connectors.
Claim 9
Dependent Claim
124 words
A heavy metal drill collar having a stiffness of at least one half that of a steel drill collar, said heavy metal drill collar comprising: an upper connector; a lower connector; a depleted uranium collar said collar having an inner bore therethrough, said collar being threadably connected to said upper and lower connectors at its ends, said upper and lower connectors being connected to said depleted uranium collar such that a shrink fit results; an inner sleeve extending through the inner bore of said collar, said inner sleeve being suitably connected at its ends to said upper and lower connector; and an outer sleeve surrounding said depleted uranium collar, said outer sleeve being suitably connected at its ends to said upper and lower connectors.
References Cited (Backward Citations)
US2126075A
Cited
US2814462A
Cited
US2958512A
Cited
US3062303A
Cited
US3047313A
Cited
US3167137A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |