US2008264289A1PendingUtilityA1

Propellant for fracturing wells

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Assignee: PROPELLANT FRACTURING & STIMULPriority: Sep 8, 2004Filed: Jul 9, 2008Published: Oct 30, 2008
Est. expirySep 8, 2024(expired)· nominal 20-yr term from priority
Inventors:John P. TiernanRichard S. Passamaneck
F42D 1/04E21B 43/263
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PatentIndex Score
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Claims

Abstract

An apparatus for fracturing wells employs a propellant charge and an ignition cord wrapped around the outer surface of the propellant charge to rapidly ignite the outer surface of the propellant charge.

Claims

exact text as granted — not AI-modified
1 . An apparatus for fracturing wells comprising:
 a propellant charge for insertion into a well and having an outer surface; and   an ignition cord helically wrapped around at least a portion of the outer surface of the propellant charge to rapidly ignite the outer surface of the propellant charge.   
   
   
       2 . The apparatus of  claim 1  wherein the ignition cord comprises detonating cord. 
   
   
       3 . The apparatus of  claim 1  wherein the ignition cord comprises deflagrating cord. 
   
   
       4 . The apparatus of  claim 1  wherein the propellant charge has a substantially cylindrical outer surface. 
   
   
       5 . The apparatus of  claim 1  wherein the surface of the propellant charge further comprises a helical groove to receive the ignition cord. 
   
   
       6 . The apparatus of  claim 1  further comprising a protective coating covering the ignition cord and surface of the propellant charge. 
   
   
       7 . The apparatus of  claim 1  further comprising a metal sheath surrounding the ignition cord.

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