Assembly of hollow torque transmitting sucker rods and sealing nipple with improved seal and fluid flow
US6991267B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 2003 |
| Grant date | Jan 31, 2006 |
| Priority date | — |
| Expiry date | Feb 5, 2024 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L15/00
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.