Down hole blow out preventer and method of use
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United States of America Patent
Stats
-
May 13, 1986
Issued Date -
N/A
app pub date -
May 10, 1984
filing date -
Feb 4, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A down hole blow out preventer which can be installed at the lower end of a drill string as close as possible to the drill bit and which can isolate an unexpected producing zone in a bore hole from the rest of the hole by closing off the drill string at its lower end and closing off the annulus between the drill string and the wall of the bore hole by means of an inflatable packer. The packer can be operated when a predetermined pressure difference exists between the annulus and the mud column inside the tool.
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