| 摘要 |
A retrievable tension-set packer, by itself, and in conjunction with retrievable tension-set bridge plug for use in field testing of oil well casings is disclosed. The retrievable tension-set packer is constructed to be set and sealed above an area of the oil well casing to be tested, while the retrievable tension-set bridge plug is constructed to be set and sealed in an area below the area of the casing to be tested. When used in conjunction with a retrievable tension-set bridge plug, the retrievable tension-set packer has a portion thereof which allows limited rotational movement for setting the bridge plug below the area to be tested, while the tension-set packer requires greater predetermined rotational movement to set the packer above the area to be tested. After the bridge plug is set below the area to be tested, the tension-set packer may be moved upwardly to an area above the area to be tested, in order to selectively isolate the area to be tested through the positive seals established by the bridge plug and packer. Following testing, the packer can be re-assembled to the bridge plug for subsequent repositioning in a different area of the oil well casing, and following complete testing, both the bridge plug and packer may be completely retrieved from the oil well casing.
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