US3645587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill string member and method for manufacture
Assignee: Individual
•
Filing: 1969-11-18
•
Granted: 1972-02-29
•
Expires: 1989-11-18
Abstract
Abstract A bottom hole stabilizer, or similar drill string member, is provided with three substantially straight longitudinal ribs on its surface, and the ribs are spaced apart to leave annular flow areas between rib sections. The member is formed as an integral construction by milling flat bottom grooves into a tubular blank having a circular outside periphery when viewed in cross section. The flat bottom grooves are milled into the blank for a sufficient distance to provide substantial annular flow area while also leaving a relatively broad rib section between each annulus area. The member is especially useful for packing a hole just above the drilling bit of a drill string.
Inventors
- 👤 Bill G Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:45
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1078
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
108 words
An improved elongate member for use as a bottom hole stabilizer in a packed hole assembly for a drill string, said elongate member having a transverse cross-sectional configuration generally in the form of a triangle, and said elongate member having an outside surface configuration which includes three equally spaced-apart rib sections which are substantially straight and longitudinally aligned parallel to a center axis of the elongate member, and said elongate member further having three flow areas formed between said three rib sections for the full length of said member so as to provide for a circulation of drilling fluid and cuttings between a well bore and said member.
Claim 2
Dependent Claim
108 words
An improved elongate member for use as a bottom hole stabilizer in a packed hole assembly for a drill string, said elongate member having a transverse cross-sectional configuration generally in the form of a triangle, and said elongate member having an outside surface configuration which includes three equally spaced-apart rib sections which are substantially straight and longitudinally aligned parallel to a center axis of the elongate member, and said elongate member further having three flow areas formed between said three rib sections for the full length of said member so as to provide for a circulation of drilling fluid and cuttings between a well bore and said member.
Claim 3
Dependent Claim
43 words
The improvement of claim 1 wherein said rib sections and said annular flow areas are formed by milling three straight, longitudinal grooves in equally spaced positions into the surface of a steel blank having a circular outside configuration when viewed in cross section.
Claim 4
Dependent Claim
19 words
The improvement of claim 2 wherein said elongate member is formed from a tubular blank having a bore therethrough.
Claim 5
Dependent Claim
15 words
The improvement of claim 1 wherein said rib sections are faced with a wear-resistant material.
Claim 6
Dependent Claim
23 words
The improvement of claim 1 wherein said elongate member is provided with threaded end portions for connecting the member into a drill string.
Claim 7
Dependent Claim
24 words
The improvement of claim 1 wherein said three rib sections have rounded surfaces for contacting the wall of a bore in a drilling operation.
Claim 8
Dependent Claim
40 words
The improvement of claim 1 wherein said annular flow areas are defined by flat-bottomed grooves milled into the surface of said elongate member, and wherein said rib sectiOns are defined by unmilled sections left between each of the milled grooves.
Claim 9
Independent Claim
147 words
A method for forming an integral elongate member having three straight, spaced-apart rib sections longitudinally positioned on an outside surface of the elongate member together with three straight annular flow areas positioned between the three rib sections, comprising the steps of milling three spaced-apart, flat-bottomed grooves in substantially straight paths along the outside surface of an elongate tubular blank having a circular outside periphery in cross section, said milling being to a sufficient depth to provide substantial flow area for the entire length of the elongate blank while at the same time leaving relatively broad rib section surfaces for wall contact in a drilling operation, applying wear-resistant facings to said rib section surfaces, and forming threaded connection means at opposite ends of said elongate blank so that the finished member can be connected to a drill string as a bottom hole stabilizer in a packed hole assembly.
Claim 10
Independent Claim
147 words
A method for forming an integral elongate member having three straight, spaced-apart rib sections longitudinally positioned on an outside surface of the elongate member together with three straight annular flow areas positioned between the three rib sections, comprising the steps of milling three spaced-apart, flat-bottomed grooves in substantially straight paths along the outside surface of an elongate tubular blank having a circular outside periphery in cross section, said milling being to a sufficient depth to provide substantial flow area for the entire length of the elongate blank while at the same time leaving relatively broad rib section surfaces for wall contact in a drilling operation, applying wear-resistant facings to said rib section surfaces, and forming threaded connection means at opposite ends of said elongate blank so that the finished member can be connected to a drill string as a bottom hole stabilizer in a packed hole assembly.
Claim 11
Dependent Claim
33 words
The method of claim 8 wherein the width of each flat-bottomed groove, when viewed in transverse cross section is approximately two to three times longer than the corresponding width of each rib section.
References Cited (Backward Citations)
US3103391A
Cited
US3125173A
Cited
US2815928A
Cited
US3285678A
Cited
US3250578A
Cited
US3343615A
Cited
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 |