Select fire switch form factor system and method

Patent metadata

Field	Value
Publication number	US-10030487-B2
Application number	US-201615044936-A
Country	US
Kind code	B2
Filing date	Feb 16, 2016
Priority date	Feb 20, 2015
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

A wellbore select fire switch retaining member system and method with an integrated through wire and ground wire in a switch sub. The system/method includes a retaining member that has a form factor acceptable by a conventional switch sub. The retaining member incorporates an electrical connection to the center pin of a pressure switch. The system further includes a secondary piston aligned with a piston in the switch (switch piston) so that external pressure is fully acted upon the entire switch piston creating a reliable switch connection. Another system includes an integrated retaining member and switch module having a form factor compatible with existing switch subs. The integrated module inputs include a ground wire and a through wire and the outputs include a ground wire, through wire and an arming wire.

First claim

What is claimed is:

1. A select fire switch retaining member for use with a gun string, the switch retaining member having a body configured to mechanically engage and couple to a fire switch and comprising a through wire link extending through the body, the through wire link having an end configured for electrical contact with the fire wire switch whereby when the fire switch is armed, the through wire link is part of a closed electrical circuit with the fire switch.

2. The select fire switch retaining member of claim 1 wherein the switch is configured to mechanically engage and couple to a switch sub of a fire switch.

3. The select fire switch retaining member of claim 1 further comprising a ground wire link electrically grounding the body of the switch retaining member.

4. The select fire switch retaining member of claim 3 wherein the ground wire link is configured for connection to an external ground wire member.

5. The select fire switch retaining member of claim 1 further comprising a plurality of conducting wires; each of said conducting wires extending through the body, and configured to make operative electrical connection to the fire switch.

6. The select fire switch retaining member of claim 1 wherein the switch retaining member has threads configured to engage threads of a fire switch to mechanically engage and couple to the fire switch.

7. The select fire switch retaining member of claim 1 wherein the body has a retaining head, and a shank having external threads.

8. The select fire switch retaining member of claim 1 wherein the through wire link is prewired to the retaining member.

9. The select fire switch retaining member of claim 8 wherein the switch retaining member comprises threads configured to engage threading on a fire switch.

10. The select fire switch retaining member of claim 1 wherein the through wire link has an opposite end, the opposite end configured for connection an external through wire member configured to be connected to a perforating gun.

11. A method of using the select fire switch retaining member of claim 1 ,
wherein the method comprises the steps of:
(1) positioning the switch retaining member in a switch sub;
(2) connecting the through wire from a perforating gun to the through wire link; and
(3) connecting the switch sub to the perforating gun.

12. A select fire switch system for use with a perforating gun string, the select fire switch system comprising:
(a) a switch body having a retaining head mechanically coupled to a switch sub;
(b) a plurality of input links configured for operative electrical connections to at least one gun of the perforating gun string; and
(c) a plurality of output links configured for operative electrical connections to at least one gun of the perforating gun string; and
(d) an activating switch member configured to connect at least one of the plurality of inputs links to at least one of the plurality of output links.

13. The select fire switch system of claim 12 at least one of the plurality of input links are configured to pass through the retaining head to enable an operative electrical connection to said activating switch member.

14. The select fire switch system of claim 12 wherein the retaining head comprises a threaded member configured to attach the retaining head to the switch sub.

15. The select fire switch system of claim 12 wherein the switch body further comprises a pressure isolation barrier.

16. The select fire switch system of claim 12 further comprising a detonator configured to be in operative electrical connection with the switch activating member.

17. The select fire switch system of claim 12 further comprising a switch port configured to sense environmental conditions.

18. The select fire switch system of claim 12 further comprising a switch port configured to sense pressure conditions.

19. The select fire switch system of claim 12 further comprising a switch port configured to sense temperature conditions.

20. The select fire switch system of claim 12 further comprising a switch port configured to measure chemical compositions of wellbore fluids.

21. The select fire switch system of claim 12 wherein the activating switch member is a pressure switch; the pressure switch comprising a primary piston activated through pressure communicated via a vent port.

22. The select fire switch system of claim 12 wherein the activating switch member is an electronic switch configured to be activated by one of the plurality of input links.

23. The select fire switch system of claim 12 wherein the activating switch member is a solid state switch configured to be activated by at least one of the plurality of input links.

24. The select fire switch system of claim 12 wherein one of plurality of the input links is an electrical ground.

25. The select fire switch system of claim 12 wherein one of plurality of the input links is a through wire.

26. The select fire switch system of claim 25 wherein the one of the plurality of input links is prewired to the retaining member.

27. The select fire switch system of claim 12 wherein one of plurality of the input links is configured to transmit an electronic signal.

28. The select fire switch system of claim 27 wherein the plurality of input links is prewired to the retaining member.

29. The select fire switch system of claim 12 wherein one of the plurality of the output links is an electrical ground.

30. The select fire switch system of claim 12 wherein one of the plurality of the output links is an electrical through wire.

31. The select fire switch system of claim 12 wherein one of the plurality of the output links is configured to transmit an electronic signal.

32. The select fire switch system of claim 12 wherein the plurality of input links is prewired to the retaining member.

Assignees

• Geodynamics Inc

Inventors

• Hardesty John T
• Rollins James A

Classifications

• F42B3/00

  Blasting cartridges, i.e. case and explosive (fuse cords, e.g. detonating fuse cords C06C5/00; chemical aspects of detonators, blasting caps or primers C06C7/00) · CPC title

• F42D1/04

  Arrangements for ignition {(ignition systems for shaped charge perforators E21B43/1185; ignition devices for seismic energy generators G01V1/06)} · CPC title

• E21B43/1185 Primary

  Ignition systems · CPC title

• F42B3/02

  adapted to be united into assemblies · CPC title