Shock load mitigation in a downhole perforation tool assembly
First Claim
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1. A perforation tool assembly, comprising:
- a spacer;
an energy train comprising a first portion and a second portion, wherein the first portion of the energy train is disposed in the spacer, wherein the first portion of the energy train comprises a moderator, wherein the moderator is configured to reduce the speed of detonation through the first portion of the energy train in a direction parallel to the axis of the perforation tool assembly relative to the speed of detonation through the second portion of the energy train in the direction parallel to the axis of the perforation tool assembly, wherein the moderator reduces the speed of detonation through the first portion of the energy train relative to the speed of detonation through the second portion of the energy train by an amount in a range from 1% to 50%, and wherein the moderator comprises the first portion of the energy train having a longer length through the spacer than a straight path through the spacer;
a first perforation gun comprising a plurality of explosive charges coupled to a first portion of the energy train; and
a second perforation gun comprising 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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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
20 Claims
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1. A perforation tool assembly, comprising:
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a spacer; an energy train comprising a first portion and a second portion, wherein the first portion of the energy train is disposed in the spacer, wherein the first portion of the energy train comprises a moderator, wherein the moderator is configured to reduce the speed of detonation through the first portion of the energy train in a direction parallel to the axis of the perforation tool assembly relative to the speed of detonation through the second portion of the energy train in the direction parallel to the axis of the perforation tool assembly, wherein the moderator reduces the speed of detonation through the first portion of the energy train relative to the speed of detonation through the second portion of the energy train by an amount in a range from 1% to 50%, and wherein the moderator comprises the first portion of the energy train having a longer length through the spacer than a straight path through the spacer; a first perforation gun comprising a plurality of explosive charges coupled to a first portion of the energy train; and a second perforation gun comprising 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification