| 摘要 |
A method and apparatus for testing a packoff in an underwater wellhead to a pressure above the normal internal pressure of the casing wherein the packoff is between the casing hanger and the wellhead, the testing being conducted so that should the packoff leak, the casing supported by the casing hanger will not be pressured to its collapse point, the method and apparatus of this invention employing the process steps and devices for maintaining the pressure on the inside of the casing elevated relative to the pressure outside the casing so that the differential pressure across the casing does not exceed the collapse rating of the casing and at the same time maintaining the internal pressure of the casing below the burst rating of that casing.
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