| 摘要 |
In accordance with an illustrative embodiment of the present invention, an anchor apparatus for preventing downward movement of a hydraulic testing unit in a tubing string includes a tubular body carrying inwardly biased slip members, a control rod telescopically received in the body for movement between an upper position enabling retraction of the slip members and a lower position where an expander member on the lower end thereof shifts said slip members outwardly into gripping engagement with the tubing wall, and a lug on the control rod above the expander member cooperable with a jay-sleeve arranged internally of the body for preventing and enabling expansion of the slip members.
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