| 摘要 |
Apparatus for testing a well packer having a supporting body anchored to a surrounding well conduit and on which is carried a seal member for forming a fluidtight seal between the surrounding well conduit and the supporting packer body. The testing apparatus may comprise an inner well conduit concentrically disposed within the surrounding well conduit and to which is attached a tubular mandrel for disposition within the supporting packer body to form an annular flow passage in fluid communication with the annulus between the two well conduits. Annular pack-off means comprising a cylindrical sleeve member is carried by the mandrel for axial movement from a first position above the annular passage to a second position sealingly engaging this flow passage and preventing flow of fluids from the annular passage through the annulus between the well conduits. The sleeve member may be mounted on the mandrel for limited axial movement relative thereto and may be initially prevented from axial movement relative to the mandrel by hold-down means. The hold-down means may be adapted to release the sleeve member in response to pressure applied to one end thereof so as to permit its limited axial movement relative to the mandrel. The hold-down means also includes cooperable friction means on the mandrel and the sleeve member responsive to pressure applied to the opposite end of the sleeve member to permit axial movement in one direction while restricting movement in the opposite direction.
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