Select-fire pressure relief subassembly for a chemical cutter
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United States of America Patent
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Mar 9, 2004
Grant Date -
N/A
app pub date -
Jul 30, 2002
filing date -
Jul 30, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A downhole chemical cutter (12) has first and second passages (124, 126) which extend parallel, in fluid communication with an interior passage (32). A first ignitor (210) in the first passage (124) ignites a propellant (34) in the interior passage (32) to dispense a cutting chemical (46). The second passage (126) extends from the interior passage (32) to an exterior of the chemical cutter (12), and is sealed by members (176, 156). After the first ignitor (210) is fired, the second ignitor (218) is fired to push the members (176, 156) from sealing the second ignitor passage (126), such that the interior passage (32) is in fluid communication with the exterior of the chemical cutter (12). A control circuit (252) has two diodes (106, 110) connected in parallel and configured for passing current of opposite polarity to respective ones of the first and second ignitors (210, 218).
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