Select fire perforating cartridge system

Patent metadata

Field	Value
Publication number	US-11519247-B2
Application number	US-201716335850-A
Country	US
Kind code	B2
Filing date	Sep 22, 2017
Priority date	Sep 23, 2016
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

A method and apparatus for using a tandem sub between two perforating guns where an EB fire pressure switch arms a detonator after the detonation of a first perforating gun and then a subsequent electrical signal can then detonate the second perforating gun.

First claim

What is claimed is:

1. A method of perforating a well comprising:
loading a first perforating gun with perforating charges and a first detonating cord;
loading a second perforating gun with perforating charges and the first detonating cord;
inserting a cartridge containing a detonator into a tandem sub, wherein the detonator is at least partially disposed within the tandem sub;
inserting a detonation transfer end fitting into first perforating gun;
inserting the first detonating cord into the detonation transfer end fitting;
coupling the first perforating gun to a first end of the tandem sub;
coupling the second perforating gun to the second end of the tandem sub;
assembling the first perforating gun, the tandem sub, and the second perforating gun in a tool string;
conveying the tool string into the well;
detonating the second perforating gun with an electrical signal, wherein the detonation of the second perforating gun arms the cartridge within the tandem sub; and
detonating the first perforating gun with an electrical signal using the armed cartridge.

2. The method of claim 1 wherein the cartridge has at least one electrical contact proximate each end.

3. The method of claim 2 wherein at least one of the electrical contacts of the cartridge is resiliently biased closed.

4. The method of claim 3 wherein at least one of the electrical contacts of the cartridge is a compression spring.

5. The method of claim 2 wherein the cartridge also holds a switch electrically connected to the detonator.

6. The method of claim 1 further comprising:
conveying the first perforating gun to a well site after loading the first perforating gun with perforating charges and detonating cord.

7. The method of claim 1 further comprising:
conveying the first perforating gun to a well site after inserting the cartridge containing the detonator into the perforating gun.

8. The method of claim 1 further comprising:
connecting the first perforating gun to a second perforating gun by threading the body of the first perforating gun directly into the body of the second perforating gun.

Assignees

• Hunting Titan Inc

Inventors

• Langford Dale
• Levine Charles
• Lane Andy
• Pundole Faraidoon
• Sansing Joel

Classifications

• E21B43/117

  Shaped-charge perforators (E21B43/118 takes precedence) · CPC title

• E21B43/1185 Primary

  Ignition systems · CPC title

• E21B43/119

  Details, e.g. for locating perforating place or direction · CPC title