Pressure activated selective perforating switch support

Patent metadata

Field	Value
Publication number	US-11274531-B2
Application number	US-202017064461-A
Country	US
Kind code	B2
Filing date	Oct 6, 2020
Priority date	May 2, 2016
Publication date	Mar 15, 2022
Grant date	Mar 15, 2022

Abstract

A method, system, and apparatus for restraining a firing pin using a bushing for use in a downhole switch that is armed using the explosive energy of a previously detonated shaped charge.

First claim

What is claimed is:

1. A switch for use downhole comprising:
a cylindrical housing with a common axis, a first face, a second face, and a through bore;
a cylindrical firing piston protruding from the first face and having a distal end with a circumferential groove, wherein the cylindrical firing piston is slideably engaged with the cylindrical housing;
a support bushing having a cylindrical sleeve with a distal end, a cylindrical base end, a shoulder formed by the cylindrical base end and the cylindrical sleeve, and a thru bore, wherein the cylindrical sleeve is slideably engaged with the firing piston;
a cylindrical end cap retainer having a frusto-conical thru bore with an inner shoulder, a countersink end, wherein the inner shoulder is engaged with the cylindrical sleeve of the support bushing and the countersink end fits flush over the support bushing cylindrical sleeve and also fits flush against the second face of the cylindrical housing;
wherein the shoulder formed by the cylindrical base end and the cylindrical sleeve of the support bushing is between the cylindrical end cap retainer and the second face of the cylindrical housing.

2. The apparatus of claim 1 wherein the distal end of the support bushing is proximate to the circumferential groove on the firing piston.

3. The apparatus of claim 1 further comprising an o-ring in the circumferential groove of the distal end of the firing piston.

4. The apparatus of claim 1 further comprising a retainer ring in the circumferential groove of the distal end of the firing piston.

5. The apparatus of claim 1 further comprising a shear pin in the circumferential groove of the distal end of the piston.

6. The apparatus of claim 1 further comprising a firing pin assembly disposed within the cylindrical housing further comprising:
a first cylindrical segment covered in an electrically non-conductive material;
a second cylindrical segment that is electrically conductive, wherein the second cylindrical segment is adapted to fit into an electrically conductive receptacle;
a first wire electrically coupled to the first cylindrical segment of the firing pin;
a second wire electrically coupled to the receptacle;
a diode in series with the second wire.

7. The apparatus of claim 3 wherein an explosive force from the detonation of an adjacent perforating gun will shear the o-ring against the support bushing.

8. The apparatus of claim 1 further comprising a retainer located within the circumferential groove sized such that its greatest outer diameter is greater than the diameter of the support bushing thru bore.

Assignees

• Hunting Titan Inc

Inventors

• Sansing Joel

Classifications

• F42D1/055

  specially adapted for firing multiple charges with a time delay · CPC title

• F42C19/06

  Electric contact parts specially adapted for use with electric fuzes {(switches operated by change of speed H01H35/06; switches operated by change of acceleration, e.g. shock or vibration, inertia switches H01H35/14; fluid-pressure-operated switches H01H35/24)} · CPC title

• F42D1/045

  Arrangements for electric ignition (dynamo-electric generators H02K) · CPC title

• E21B43/1185 Primary

  Ignition systems · CPC title

• F42B3/12

  Bridge initiators {(F42B3/103, F42B3/11, F42B3/195 take precedence; electric ignitors in propellant charges F42C19/12)} · CPC title