Assembly of hollow torque transmitting sucker rods and sealing nipple with improved seal and fluid flow
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United States of America Patent
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Jan 31, 2006
Issued Date -
N/A
app pub date -
Sep 24, 2003
filing date -
Dec 3, 1999
priority date (Note) -
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status (Latency Note)
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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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