Claims
- 1. A sucker rod end fitting comprising:a rod receptacle having a closed axially inner end and an open axially outer end, wherein said rod receptacle comprises a plurality of integrally formed, outwardly converging, axially aligned annuli, each such anulus approaching the rod asymptotically and being tapered to be of decreasing diameter towards said open end, and defining a separate transition surface between each pair of adjacent annuli included in said plurality of annuli, wherein each such transition surface comprises a continuous function surface having no abrupt change in curvature.
- 2. The sucker rod end fitting of claim 1, further comprising, a transition surface between said closed end and the maximum diameter of the annulus distal from said open end, wherein said transition surface comprises a wave-shaped cross-section.
- 3. A sucker rod construction comprising:an end fitting comprising a rod receptacle formed to define an internal surface having a closed axially inner end and an open axially outer end, wherein said rod receptacle comprises a plurality of integrally formed, outwardly converging, axially aligned annuli, each such annulus approaching the rod asymptotically and being tapered to be of decreasing diameter towards said open end and defining a separate transition surface between each pair of adjacent annuli included in said plurality of annuli, wherein each such transition surface comprises a continuous function surface having no abrupt change in curvature; a cylindrical fiberglass rod having an end having a cylindrical outer surface being received within said rod receptacle through said open outer end and cooperating therewith to define an annular chamber between said outer surface of said end of said rod and said outwardly converging annuli of said rod receptacle; and a body of initially flowable adhesive that cures to bond said outer surface of said end of said rod and to solidify to form a plurality of wedges to cooperate with said annuli.
- 4. The sucker rod construction of claim 3, wherein said end fitting further comprises a transition surface between said closed end and the maximum diameter of the annulus distal from said open end, wherein said transition surface comprises a wave-shaped cross-section.
- 5. A sucker rod end fitting comprising:a rod receptacle having a closed axially inner end and an open axially outer end, wherein said rod receptacle comprises a plurality of integrally formed, outwardly converging, axially aligned annuli, each such annulus approaching the rod asymptotically and being tapered to be of decreasing diameter towards said open end and defining a separate transition surface between each pair of adjacent annuli included in said plurality of annuli, wherein each such transition surface comprises a continuous function surface having no abrupt change in curvature, and a particular transition surface between said closed end and the maximum diameter of the annulus distal from said open end, wherein said particular transition surface comprises a wave-shaped cross-section.
- 6. A sucker rod construction comprising:an end fitting comprising a rod receptacle formed to define an internal surface having a closed axially inner end and an open axially outer end, wherein said rod receptacle comprises a plurality of integrally formed, outwardly converging, axially aligned annuli, each such annulus approaching the rod asymptotically and being tapered to be of decreasing diameter towards said open end and defining a separate transition surface between each pair of adjacent annuli included in said plurality of annuli, wherein each such transition surface comprises a continuous function surface having no abrupt change in curvature, and a particular transition surface between said closed end and the maximum diameter of the annulus distal from said open end, wherein said particular transition surface comprises a wave-shaped, cross-section; a cylindrical fiberglass rod having an end having a cylindrical outer surface being received within said rod receptacle through said open outer end and cooperating therewith to define an annular chamber between said outer surface of said end of said rod and said outwardly converging annuli of said rod receptacle; and a body of initially flowable adhesive that curves to bond said outer surface of said end of said rod and to solidify to form a plurality of wedges to cooperate with said annuli.
- 7. A sucker rod end fitting comprising:an end fitting, said end fitting comprising a rod receptacle to receive said sucker rod to define an internal surface having a closed axially inner end and an open axially outer end, wherein said rod receptacle comprises a plurality of integrally formed, outwardly converging, axially aligned annuli, each such annulus approaching the rod asymptotically and being tapered to be of decreasing diameter towards said open end and defining a separate transition surface between each pair of adjacent annuli included in said plurality of annuli, wherein each such transition surface comprises a continuous function surface having no abrupt change in curvature, and a particular transition surface between said closed end and the maximum diameter of the annulus distal front said open end, wherein said particular transition surface comprises a wave-shaped cross-section; and a body of initially flowable adhesive that cures to bond said outer surface of said end of said rod and to solidify to form a plurality of wedges to cooperate with said annuli.
- 8. The sucker rod of claim 7, wherein said sucker rod comprises fiberglass.
- 9. The sucker rod of claim 7, wherein said sucker road comprises a composite material.
- 10. A sucker rod string for use in an oil well, said string comprising a plurality of sucker rods connected end to end by end fittings, wherein at least one of said end fittings comprises a rod receptacle to receive a sucker rod and formed to define an internal surface having a closed axially inner end and an open axially outer end, wherein said rod receptacle comprises a plurality of integrally formed, outwardly converging, axially aligned annuli, each such annulus approaching the rod asymptotically and being tapered to be of decreasing diameter towards said open end and defining a separate transition surface between each pair of adjacent annuli included in said plurality of annuli, wherein each such transition surface comprises a continuous function surface having no abrupt change in curvature, and a particular transition surface between said closed end and the maximum diameter of the annulus distal from said open end, wherein said particular transition surface comprises a wave-shaped cross-section.
- 11. The sucker rod string of claim 10, wherein at least one of said sucker rods comprises fiberglass.
- 12. The sucker rod string of claim 10, wherein at least one of said sucker rods comprises a composite material.
- 13. A sucker rod end fitting comprising:a rod receptacle having an interior wall defining an annulus for housing a sucker rod, said interior wall having a first section converging axially inward and away from said rod, a second section converging outward toward said rod, a third section converging axially inward and away from said rod, and a fourth section converging outward toward said rod and approaching said rod asymptotically and terminating at an annulus base, said defined annulus providing a wedge having a leading edge for distributing positive forces and a trailing edge for distributing negative forces.
- 14. A sucker rod construction comprising:a rod receptacle having an interior wall defining an annulus for housing a sucker rod, said interior wall having a first section converging axially inward and away from said rod, a second section converging outward toward said rod, a third section converging axially inward and away from said rod, and a fourth section converging outward toward said rod and approaching said rod asymptotically and terminating at an annulus base, said defined annulus providing a wedge having a leading edge for distributing positive forces and a trailing edge for distributing negative forces; a cylindrical rod received within said annulus and cooperating therewith to define an annular chamber between said rod and said interior wall; and a body of initially flowable adhesive that cures to bond to said rod and to solidify to form a wedge to cooperate with said annulus.
- 15. The sucker rod of claim 14, wherein said sucker rod comprises fiberglass.
- 16. The sucker rod of claim 14, wherein said sucker rod comprises a composite material.
- 17. A sucker rod string for use in an oil well, said string comprising a plurality of sucker rods connected end to end by end fittings, wherein at least one of said end fittings comprises a rod receptacle having an interior wall defining an annulus for housing a sucker rod, said interior wall having a first section converging axially inward and away from said rod, a second section converging outward toward said rod, a third section converging axially inward and away from said rod, and a fourth section converging outward toward said rod and approaching said rod asymptotically and terminating at an annulus base, said defined annulus providing a wedge having a leading edge for distributing positive forces and a trailing edge for distributing negative forces.
- 18. The sucker rod string of claim 17, wherein at least one of said sucker rods comprises fiberglass.
- 19. The sucker rod string of claim 17, wherein at least one of said sucker rods comprises a composite material.
- 20. A sucker rod end fitting comprising:a rod receptacle having an interior wall defining a plurality of axially aligned annuli for housing a sucker rod, wherein each annulus comprises a first section of said interior wall converging axially inward and away from said rod, a second section of said interior wall converging outward toward said rod, a third section of said interior wall converging axially inward and away from said rod, and a fourth section of said interior wall converging outward toward said rod and approaching said rod asymptotically; and wherein said fourth section terminates at an annulus base, each said defined annulus providing a wedge having a leading edge for distributing positive forces and a trailing edge for distributing negative forces.
- 21. A sucker rod construction comprising:a rod receptacle having an interior wall defining a plurality of axially aligned annuli for housing a sucker rod, wherein each annulus comprises a first section of said interior wall converging axially inward and away from said rod, a second section of said interior wall converging outward toward said rod, a third section of said interior wall converging axially inward and away from said rod, and a fourth section of said interior wall converging outward toward said rod and approaching said rod asymptotically; and wherein said fourth section terminates at an annulus base, each said defined annulus providing a wedge having a leading edge for distributing positive forces and a trailing edge for distributing negative forces, a cylindrical rod received within said rod receptacle and cooperating therewith to define an annular chamber between said rod and said interior wall; and a body of initially flowable adhesive that cures to bond to said rod and to solidify to form a plurality of wedges to cooperate with said annulus.
- 22. The sucker rod of claim 21, wherein at least one of said sucker rods comprises fiberglass.
- 23. The sucker rod of claim 21, wherein at least one of said sucker rods comprises a composite material.
- 24. A sucker rod string for use in an oil well, said string comprising a plurality of sucker rods connected end to end by end fittings, wherein at least one of said end fittings comprises a rod receptacle having an interior wall defining a plurality of axially aligned annuli for housing a sucker rod, wherein each annulus comprises a first section of said interior wall converging axially inward and away from said rod, a second section of said interior wall converging outward toward said rod, a third section of said interior wall converging axially inward and away from said rod, and a fourth section of said interior wall converging outward toward said rod and approaching said rod asymptotically; and wherein said fourth section terminates at an annulus base, each said defined annulus providing a wedge having a leading edge for distributing positive forces and a trailing edge for distributing negative forces.
- 25. The sucker rod string of claim 24, wherein at least one of said sucker rods comprises fiberglass.
- 26. The sucker rod string of claim 24, wherein at least one of said sucker rods comprises a composite material.
- 27. A sucker rod end fitting comprising:a rod receptacle having an interior wall defining an annulus for housing a sucker rod, said interior wall having a first section converging axially inward and away from said rod, and a second section converging outward toward said rod, said defined annulus approaching the rod asymptotically and providing a wedge having a leading edge for distributing positive forces and a trailing edge for distributing negative forces.
- 28. A sucker rod construction comprising:a rod receptacle having an interior wall defining an annulus for housing a sucker rod, said interior wall having a first section converging axially inward and away from said rod, and a second section converging outward toward said rod, said defined annulus approaching the rod asymptotically and providing a wedge having a leading edge for distributing positive forces and a trailing edge for distributing negative forces; a cylindrical rod received within said annulus and cooperating therewith to define an annular chamber between said rod and said interior wall; and a body of initially flowable adhesive that cures to bond to said rod and to solidify to form a wedge to cooperate with said annulus.
- 29. A sucker rod end fitting comprising:a rod receptacle having an interior wall defining an annulus for housing a sucker rod, said interior wall having a first section converging axially inward and away from said rod, a second section converging outward for a given distance toward said rod at a given angle, a third section converging axially inward and away from said rod, and a fourth section converging outward for a distance less than said given distance toward said rod and approaching said rod at an angle larger than said given angle, said defined annulus providing a pair of wedges, each having a leading edge for distributing positive forces and a trailing edge for distributing negative forces.
- 30. A sucker rod construction comprising:a rod receptacle having an interior wall defining an annulus for housing a sucker rod, said interior wall having a first section converging axially inward and away from said rod, a second section converging outward for a given distance at a given angle, a third section converging axially inward and away from said rod, and a fourth section converging outward for a distance less than said given distance toward said rod and approaching said rod at an angle larger than said given angle, said defined annulus providing a pair of wedges, each wedge having a leading edge for distributing positive forces and a trailing edge for distributing negative forces; a cylindrical rod received within said annulus and cooperating therewith to define an annular chamber between said rod and said interior wall; and a body of initially flowable adhesive that cures to bond to said rod and to solidify to form said pair of wedges to cooperate with said annulus.
RELATED APPLICATION
This Application is a continuation of U.S. patent application Ser. No. 08/936,348 filed Sep. 24, 1997.
US Referenced Citations (6)
Continuations (1)
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Number |
Date |
Country |
Parent |
08/936348 |
Sep 1997 |
US |
Child |
09/317353 |
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US |