| 摘要 |
A flexible coupler is provided for the sinker bars of the sucker rod string of a deep oil well. The coupling unit has a flexible section so that the coupling will flex to a greater extent than the sinker bars. The coupling also has a cylindrical bearing surface which is as large as will slide through the eduction tube freely. The bearing surface has longitudinal grooves for the passage of fluid. The coupling itself has a cylindrical friction fit between the pin and the box to help prevent unscrewing of the unit as well as the radial faces which are torqued to API specifications against one another.
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