US 11,112,221 B2Granted

Oil well perforators

AssigneeQinetiq Limited

InventorsPhilip Duncan Church, Robert Peter Claridge, Peter John Gould, Richard Gordon Townsley

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Abstract

An oil and gas well shaped charge perforator capable of providing an exothermic reaction after detonation is provided, comprising a housing (2), a high explosive (3), and a reactive liner (6) where the high explosive is positioned between the reactive liner and the housing. The reactive liner (6) is produced from a reactive composition which is capable of sustaining an exothermic reaction during the formation of the cutting jet. The composition is a pressed i.e. compacted particulate composition comprising at least two metals, wherein one of the metals is present as spherical particulate, and the other metal is present as a non-spherical particulate. There may also be at least one further metal, which is not capable of an exothermic reaction with the reactive composition, present in an amount greater than 10% w/w of the liner. To aid consolidation a binder may also be added.

Claims17

Dependent claims

A reactive oil and gas well shaped charge perforator liner comprising:

a reactive composition of at least two metals wherein the liner is a compacted particulate composition comprising a spherical metal particulate and a non-spherical metal particulate,
wherein the at least two metals are selected such that they produce, upon activation of the shaped charge liner, an electron compound,
wherein the non-spherical metal particulate is selected from Ce, Fe, Co, Li, Mg, Mo, Ni, Nb, Pb, Pd, Ta, Ti, Zn, or Zr,
wherein the non-spherical particulate has an average longest dimension of less than 300 microns, wherein the average longest dimension of the non-spherical metal particulate is at least twice the diameter of the spherical particulate, wherein the non-spherical particle has an aspect ratio of from 50:1 to 200:1,
wherein the liner further comprises at least one further metal particulate, which is substantially inert with the at least two metals and the further metal is present in an amount greater than 10% w/w of the liner,
and wherein the at least two metals and at least one further metal are uniformly dispersed to form an admixture.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/855,713Filed 22 Apr 2020 · continuation
Priority: GB 101271629 Jul 2010
Published: US 2020/0300586 A124 Sep 2020
Granted: 7 Sep 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

F42B 1/032
Shaped or hollow charges: characterised by the material of the liner
E21B 43/117
Gun or shaped-charge perforators: shaped-charge perforators
F42B
Explosive charges
E21B
Earth or rock drilling

Family

PCT/GB2011/001119Parent of this continuation · filed 26 Jul 2011
US 2020/0300586 A1Pre-grant publication · published 24 Sep 2020
Application13/811,331Parent of this continuation
US 10,704,867 B2Parent of this continuation
US 2013/0126238 A1Published application
US 11,112,221 B2This patent

From the US filing history. Foreign family members aren’t listed.