Patent ID: 6702009
Filing Date: 2004-03-09
Classification: E21B

Abstract:
A chemical cutter for dispensing a cutting chemical in a well to severe a tubular member, comprising:a tool housing having an interior passage which extends through a central portion of said chemical cutter; a propellant disposed in said interior passage, being ignitable for creating pressure to push said cutting chemical from within said tool housing and into said well; a first ignitor passage in fluid communication with said interior passage; a first ignitor disposed in said first ignitor passage, such that ignition of said first ignitor ignites said propellant disposed in said interior passage; a second ignitor passage which is, at least in part, spaced apart from said first ignitor passage and which is in fluid communication with said interior passage, said second ignitor passage having an interior opening in fluid communication with said interior passage, and an exterior opening in fluid communication with an exterior of said tool housing; a second ignitor disposed in said second ignitor passage; a first seal member extending across and sealing said second ignitor passage, between said second ignitor and said interior passage of said tool housing; a second seal member extending across and sealing said second ignitor passage, between said second ignitor and the exterior of said tool housing; wherein said first and second seal members seal said second ignitor from said interior passage and the exterior of said tool housing after said first ignitor is ignited and the propellant is combusted to dispense the cutting chemical from said tool housing; wherein igniting said second ignitor removes at least part of said first seal member from extending across and sealing said second ignitor passage, and removes at least a portion of said second seal member from extending across and sealing said second ignitor passage, such that said interior passage of said tool housing is in fluid communication with said second ignitor passage and the exterior of said tool housing.