Perforating apparatus, firing assembly, and method
First Claim
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1. An apparatus for perforating a casing string comprising:
- a first pressure chamber and a second pressure chamber, each first and second pressure chamber comprising a gun assembly contained therein, the first pressure chamber being positioned longitudinally adjacent the second pressure chamber on the casing string;
a firing assembly for igniting the gun assembly in the first pressure chamber comprising;
a detonator;
a remote signaler to remotely detonate the firing assembly;
a ballistic transfer assembly for igniting the gun assembly in the second pressure chamber, wherein said ballistic transfer assembly comprises a booster charge at one end of said first pressure chamber adjacent a receiver charge at one end in said second pressure chamber;
an independent power source for supplying a voltage necessary to activate said detonator;
said independent power source comprising;
a low voltage power source; and
a high-voltage device, said high-voltage device elevating a low voltage delivered from said low voltage power source to a higher voltage sufficient to activate said detonator.
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Abstract
An apparatus for perforating a casing string including a first module and a second module, each including a gun assembly. The first module is positioned longitudinally adjacent the second module on the casing string. Each module contains a firing assembly for igniting the gun assembly in the first module, a remote signaler to remotely detonate the firing assembly, and ballistic transfer assembly for igniting the gun assembly in the second module. The ballistic transfer assembly includes a booster charge.
86 Citations
10 Claims
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1. An apparatus for perforating a casing string comprising:
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a first pressure chamber and a second pressure chamber, each first and second pressure chamber comprising a gun assembly contained therein, the first pressure chamber being positioned longitudinally adjacent the second pressure chamber on the casing string; a firing assembly for igniting the gun assembly in the first pressure chamber comprising; a detonator; a remote signaler to remotely detonate the firing assembly; a ballistic transfer assembly for igniting the gun assembly in the second pressure chamber, wherein said ballistic transfer assembly comprises a booster charge at one end of said first pressure chamber adjacent a receiver charge at one end in said second pressure chamber; an independent power source for supplying a voltage necessary to activate said detonator;
said independent power source comprising;a low voltage power source; and a high-voltage device, said high-voltage device elevating a low voltage delivered from said low voltage power source to a higher voltage sufficient to activate said detonator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for perforating a subterranean earth formation through a wellbore lined with casing, comprising:
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a first carrier supporting a first gun assembly and being mounted on said casing at a first depth in the wellbore proximate a first zone of interest in said formation; a second carrier supporting a second gun assembly mounted on said casing at a second depth in the wellbore proximate a second zone of interest in said formation; and a remote transmitter for detonating said first gun assembly and said second gun assembly, respectively; wherein said first carrier also supports a third gun assembly; wherein said first gun assembly is contained in a first chamber; wherein said third gun assembly is contained in a third chamber; wherein the gun assemblies supported on said first carrier are disposed about the periphery of said casing and are positioned at substantially the same depth within the wellbore; and wherein when said casing is positioned in said wellbore said casing and said wellbore are substantially coaxial. - View Dependent Claims (10)
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Specification