Patent US4460202A successfully refreshed from Google Patents.
US4460202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intermediate weight drill string member
Assignee: WEATHERFORD U S Inc
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Filing: 1980-11-26
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Granted: 1984-07-17
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Expires: 2000-11-26
Abstract
Abstract An improved intermediate weight member to be put in a drill string between the collars and the drill pipe which has a spiraled outer surface, and which is so configured as to provide a uniform bending moment of inertia over its length including the slip area.
Inventors
- 👤 Glenn G. Chance
- 👤 William Kovensky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:51
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/22; E21B17/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
179 words
A drill string member to be interposed in a drill string between the collars at the bit end and the drill pipe at the upper end, said drill string member having a weight per unit length less than that of the collars and more than that of the drill pipe in said string thereby forming an intermediate weight member, said intermediate weight member including tool joint means at each end, said member having a slip and elevator area at one end of its body portion adjacent the tool joint means at said one end, the remaining main portion of said body between said slip and elevator area and said tool joint being formed with at least one spiral groove, said slip and elevator area having a diameter less than that of the spiral main body portion said tool joint means, and the depth and number of said at least one spiral groove being such that the bending moment of inertia through said spiral area is substantially equal to the bending moment of inertia in said slip and elevator area.
Claim 2
Dependent Claim
179 words
A drill string member to be interposed in a drill string between the collars at the bit end and the drill pipe at the upper end, said drill string member having a weight per unit length less than that of the collars and more than that of the drill pipe in said string thereby forming an intermediate weight member, said intermediate weight member including tool joint means at each end, said member having a slip and elevator area at one end of its body portion adjacent the tool joint means at said one end, the remaining main portion of said body between said slip and elevator area and said tool joint being formed with at least one spiral groove, said slip and elevator area having a diameter less than that of the spiral main body portion said tool joint means, and the depth and number of said at least one spiral groove being such that the bending moment of inertia through said spiral area is substantially equal to the bending moment of inertia in said slip and elevator area.
Claim 3
Dependent Claim
18 words
The combination of claim 1, wherein said main body portion is formed with three of said spiral grooves.
Claim 4
Dependent Claim
18 words
The combination of claim 1, wherein said main body portion is formed with four of said spiral grooves.
Claim 5
Dependent Claim
40 words
The combination of claim 1, the pitch of said at least one spiral groove being such that said groove will appear substantially as a chordal line in all planes perpendicular to the axis of said member through said spiral area.
Claim 6
Dependent Claim
75 words
The combination of claim 1, wherein said spiral groove area merges into said slip and elevator area at a relatively gentle sloped conical portion, and said at least one groove feathering through said conical portion, whereby the bending moment of inertia in said transistion zone between said slip and elevator area and said spiral area is substantially equal to the bending moment of inertia in said slip and elevator area and in said spiral area.
Claim 7
Dependent Claim
17 words
The combination of claim 5, wherein said sloped conical portion is at an angle of about 15°.
Claim 8
Dependent Claim
27 words
The combination of claim 1, and hard facing wear protecting material on the region of juncture between said slip and elevator area and the associated tool joint.
Claim 9
Dependent Claim
22 words
The combination of claim 1, wherein said tool joint means comprises separate tool joints welded onto the ends of said body portion.
Claim 10
Dependent Claim
18 words
The combination of claim 1, wherein said body together with said tool joint means are formed integrally together.
Claim 11
Dependent Claim
37 words
The combination of claim 1, wherein said at least one spiral groove is wound right handed, whereby said spiral groove tends to screw the drill bit at the lower end of the string down into the borehole.
References Cited (Backward Citations)
US3125173A
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US1714818A
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US2295873A
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US2334350A
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US2999552A
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US3080179A
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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) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |