Pipe joints or couplings – Particular interface – Tapered
Reexamination Certificate
2006-01-31
2006-01-31
Hewitt, James M. (Department: 3679)
Pipe joints or couplings
Particular interface
Tapered
C285S334000, C285S390000
Reexamination Certificate
active
06991267
ABSTRACT:
An elongated drive string assembly includes a plurality of hollow sucker rods and connecting elements between a drive head located at the surface of an oil well and a rotary pump located deep down in an oil well, with a series of holes at each end to substantially increase the flow of extracted fluid. Each hollow sucker rod has a first end with a torque shoulder, which engages a torque shoulder formed on a connecting element. The threads are frusto-conical, non-symmetrical threads with a differential diametral taper. The torque shoulders have a maximized mean diameter and cross-sectional area to resist storing reactive torque in the drive string.
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Grade D Hollow Sucker Rod, CPMEC Brochure, Undated.
Ernst Hugo A.
Johnson Daniel
Villasante José
Hewitt James M.
Siderca S.A.I.C.
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