E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/114 (2006.01)
Patent
CA 2586369
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 bum 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.
Goodwin Mckay
Precision Energy Services Inc.
LandOfFree
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