| 摘要 |
The cable head provides an H2S resistant assembly which includes a weak link therein substantially isolated from any stress other than tensile stress induced by the logging cable. The cable head also provides a fishing neck at the top of the tool string after the weak link is severed and the wireline retrieved. Moreover, the logging cable is positively secured to the cable head by a force-fit wedge, and the design thereof ensures that parting of the weak link also provides for a positive mechanical disengagement of the logging cable from the cable head. Finally, an external sinker bar has been provided which mounts externally of the cable head, surrounding the logging cable above the cable head and mechanically interlocking therewith; such sinker bars may be run above the cable head in series, each interlocking with the one below it.
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