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US 2019/0162056 A1Published application
Pressure Activated Selective Perforating Switch Support
AssigneeHunting Titan, Inc.
InventorJoel Sansing
Life of this patent
Estimating the term…
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.
Claims44
A switch for use downhole comprising:
- an outer cylindrical housing having a common axis and a thru bore;
- an inner cylindrical housing located within the thru bore of the outer cylindrical housing having an outer surface and a thru bore where the outer surface is electrically insulated from the thru bore;
- a cylindrical electrically conductive receptacle having a thru bore and located within the thru bore of the inner cylindrical housing;
- an electrically conductive piston with a first end having a conical cavity, a distal end, and a radial groove about the distal end;
- an electrically insulating piston sleeve surrounding the circumference of the first end of the piston;
- an electrically conductive firing pin having a first cylindrical segment, a second cylindrical segment, and a third cylindrical segment, wherein the first cylindrical segment is slideably engaged with the inner thru bore of the receptacle, the second cylindrical segment is slideably engaged with the thru bore of the inner cylindrical housing, the third cylindrical segment having a conical distal end located adjacent to the conical bore of the piston;
- an electrically insulating bushing with a base end, a cylindrical sleeve, a distal end, and an inner bore, wherein the inner bore is slideably engaged with the distal end of the piston;
- wherein the circumferential groove of the distal end of the piston extends beyond the distal end of the bushing;
- and
- wherein the base end of the bushing is proximate to the piston sleeve.
7 more elements
15-22. (canceled)
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, and a thru bore, wherein the cylindrical sleeve is slideably engaged with 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 slideably 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 of the base end of the support bushing is between the cylindrical end cap retainer and the second face of the cylindrical housing.
2 more elements
29-34. (canceled)
The apparatus of claim 21 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.
The apparatus of claim 21 wherein the interface of the sleeve portion with the base portion forms a shoulder.
(canceled)
A system for use downhole comprising:
- at least one perforating gun with a first end and a second end, the first end being coupled to a first tandem sub;
- at least one shaped charge installed within a charge tube located within the at least one perforating gun;
- a detonating cord coupled to the at least one shaped charge;
- a detonator coupled to the detonating cord and installed in the tandem sub;
- an arming switch electrically coupled to the detonator, the arming switch further comprising:
- an electrically conductive outer cylindrical housing having a common axis and a thru bore;
- an electrically insulating inner cylindrical housing located within the thru bore of the outer cylindrical housing and having a thru bore;
- an electrically conductive cylindrical receptacle having a thru bore and located within the thru bore of the inner cylindrical housing;
- an electrically conductive piston with a first end having a conical bore and a distal end having a proximately located circumferential grove;
- an electrically conductive firing pin having a first cylindrical segment, a second cylindrical segment, and a third cylindrical segment, wherein the first cylindrical segment is slideably engaged with the inner thru bore of the receptacle, the second cylindrical segment is slideably engaged with the thru bore of the inner cylindrical housing, the third cylindrical segment having a conical distal end located adjacent to the conical bore of the piston;
- and
- a bushing with a disc base end, a cylindrical wall, a distal end, and an inner bore, wherein the inner bore is slideably engaged with the distal end of the piston
9 more elements
A method for detonating a shaped charge comprising:
- assembling at least one perforating gun to at least one tandem sub;
- installing at least one perforating shaped charge in the at least one perforating gun;
- installing at least at least one detonator in the at least one tandem sub;
- installing a detonating cord between the detonator and the at least one shaped charge;
- installing a switch in the tandem sub;
- assembling an arming switch for a downhole perforating gun with a firing piston having a distal end protruding from the switch;
- machining a groove on a distal end of the piston;
- engaging a support busing on the distal end of the piston, wherein the support bushing is located between the switch housing and the machined groove;
- and
- installing a retaining device on the machined groove, wherein the retaining device engages with the support bushing.
7 more elements
56-64. (canceled)
Dependencies are inferred from the claim text.