Wells – Processes – Perforating – weakening – bending or separating pipe at an...
Reexamination Certificate
2007-04-25
2009-08-11
Dang, Hoang (Department: 3672)
Wells
Processes
Perforating, weakening, bending or separating pipe at an...
C166S055100, C166S311000
Reexamination Certificate
active
07571768
ABSTRACT:
A perforating gun and one or more volume-receiving surge canisters can be actuated at a time delay after perforation for creating a dynamic underbalance condition to aid in directing debris out of the perforations and fractures and into the wellbore. A timer and triggering device actuate one or more canisters in parallel or series after a pre-determined time delay or delays which can be related to wellbore conditions following perforation. Use of propellant-type perforating gun further benefits from favorable propellant burn conditions for forming perforations and followed thereafter by a perforation-cleaning underbalance pressure conditions characterized by one or more of an increased rate of change depression of the pressure in the adjacent annulus, a greater magnitude of pressure depression and a longer duration of underbalance.
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Dang Hoang
Oathout Mark A.
Precision Energy Services, Inc.
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