Flapper valve assembly apparatus and method
The flapper valve assembly can be used in series to provide collapsible closures in a drill pipe. Thus, when work strings are withdrawn through the flapper valve, it will close in a conventional manner. However, when the work string must be reinserted through the closed flapper, a collar holding the...
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| Sprache: | eng |
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| Zusammenfassung: | The flapper valve assembly can be used in series to provide collapsible closures in a drill pipe. Thus, when work strings are withdrawn through the flapper valve, it will close in a conventional manner. However, when the work string must be reinserted through the closed flapper, a collar holding the flapper in its closed position can be sheared from its position within the assembly housing. |
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