Shock load mitigation in a downhole perforation tool assembly
First Claim
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1. A method of perforating a wellbore, comprising:
- calculating a speed of propagation of a shock wave through a tool body of a perforation tool assembly, wherein the perforation tool assembly comprises a plurality of explosive charges;
calculating a speed of detonation propagation in an energy train in a direction parallel to an axis of the tool body of the perforation tool assembly;
designing the perforation tool assembly, based on calculating the speed of propagation of the shock wave and calculating the speed of detonation propagation, to mitigate a shock load associated with an interaction between detonation of the plurality of explosive charges;
building the perforation tool assembly based on designing the perforation tool assembly; and
perforating a wellbore by firing the perforation tool assembly.
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Abstract
A perforation tool assembly comprises an energy train, a first perforation gun, and a second perforation gun. The energy train comprises a moderator to reduce the speed of propagation of a detonation in a direction parallel to the axis of the perforation tool assembly. The first perforation gun comprises a plurality of explosive charges coupled to a first portion of the energy train. The second perforation gun comprises a plurality of explosive charges coupled to a second portion of the energy train, wherein the second portion of the energy train is coupled to the first portion of the energy train.
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Citations
19 Claims
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1. A method of perforating a wellbore, comprising:
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calculating a speed of propagation of a shock wave through a tool body of a perforation tool assembly, wherein the perforation tool assembly comprises a plurality of explosive charges; calculating a speed of detonation propagation in an energy train in a direction parallel to an axis of the tool body of the perforation tool assembly; designing the perforation tool assembly, based on calculating the speed of propagation of the shock wave and calculating the speed of detonation propagation, to mitigate a shock load associated with an interaction between detonation of the plurality of explosive charges; building the perforation tool assembly based on designing the perforation tool assembly; and perforating a wellbore by firing the perforation tool assembly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of perforating a wellbore, comprising:
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calculating a speed of propagation of a shock wave through a plurality of completed perforation tool assemblies during a corresponding plurality of perforating events; calculating a speed of detonation propagation in an energy train in a direction parallel to an axis of a tool body of one or more of the plurality of completed perforation tool assemblies; and designing a new perforation tool assembly to mitigate a shock load associated with an interaction between detonation of a plurality of explosive charges in the new perforation tool based on calculating the speed of propagation of the shock wave and calculating the speed of detonation propagation; building the new perforation tool assembly based on the perforation tool assembly design; and perforating a wellbore by firing the new perforation tool assembly. - View Dependent Claims (17, 18, 19)
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Specification