Power charge ignition

Patent metadata

Field	Value
Publication number	US-11933595-B2
Application number	US-202017632485-A
Country	US
Kind code	B2
Filing date	Aug 13, 2020
Priority date	Aug 13, 2019
Publication date	Mar 19, 2024
Grant date	Mar 19, 2024

Abstract

A method and apparatus for igniting a power charge in downhole wellbore using an ignition propellant mixed with a main propellant.

First claim

What is claimed is:

1. A power charge comprising:
a tubular housing having a first end, a second end, and a mid-section;
a main propellant within the housing proximate the mid-section; and
a first ignition portion within the housing proximate the first end comprising a first mixture of the main propellant and an ignition propellant.

2. The power charge of claim 1 wherein the ignition propellant has an auto ignition temperatures of 600 degrees Celsius or less.

3. The power charge of claim 1 wherein the ignition propellant has a propagation index of 1.5 or greater and the main propellant has a propagation index of 1.5 or less.

4. The power charge of claim 1 wherein the ignition propellant has a propagation index of 2.0 or more.

5. The power charge of claim 1 wherein the ignition propellant has a propagation index of 2.75 or more.

6. The power charge of claim 1 wherein the first ignition propellant is boron potassium nitrate.

7. The power charge of claim 1 wherein the first mixture of main propellant and ignition propellant comprises a gradient with predominately ignition propellant towards the first end and transitioning to primarily main propellant away from the first end.

8. The power charge of claim 7 wherein the gradient ranges from 90% or more ignition propellant near the first end to 10% or less ignition propellant away from the first end.

9. The power charge of claim 1 wherein the first ignition portion extends between 0.5 inch and 1.5 inches from the first end.

10. The power charge of claim 1 wherein the ignition portion extends from the end of the housing 12.5% of the length of the housing.

11. The power charge of claim 1 wherein the ignition portion extends from the end of the housing 25% of the length of the housing.

12. The power charge of claim 1 wherein the first ignition portion is 0.75% of the power charge by weight.

13. The power charge of claim 1 where the first ignition portion is 1.50% of the power charge by weight.

14. The power charge of claim 1 wherein the first ignition portion is 1.50% of the power charge by weight.

15. A power charge comprising:
a tubular housing having a first end, a second end, and a mid-section;
a main propellant within the housing proximate the mid-section;
a first ignition portion within the housing proximate the first end comprising a first mixture of the main propellant and an ignition propellant; and
a second ignition portion within the housing proximate the second end comprising a second mixture of the main propellant and the ignition propellant.

16. The power charge of claim 15 wherein the ignition propellant has a propagation index of 1.5 or greater and the main propellant has a propagation index of 1.5 or less.

17. The power charge of claim 15 wherein the ignition propellant has a propagation index of 2.0 or more.

18. The power charge of claim 15 wherein the ignition propellant has a propagation index of 2.75 or more.

19. The power charge of claim 15 wherein the ignition propellant is boron potassium nitrate.

20. The power charge of claim 15 wherein:
the first mixture of main propellant and ignition propellant comprises a gradient with predominately ignition propellant towards the first end and transitioning to primarily main propellant away from the first end; and
the second mixture of main propellant and ignition propellant comprises a gradient with predominately ignition propellant towards the second end and transitioning to primarily main propellant away from the second end.

21. The power charge of claim 20 wherein:
the first gradient ranges from 90% or more ignition propellant near the first end to 10% or less ignition propellant away from the first end; and
the second gradient ranges from 90% or more ignition propellant near the second end to 10% or less ignition propellant away from the second end.

22. The power charge of claim 15 wherein:
the first ignition portion extends between 0.5 inch and 1.5 inches from the first end; and
the second ignition portion extends between 0.5 inch and 1.5 inches from the second end.

23. The power charge of claim 15 wherein the first and second ignition portion are together 1.5% of the power charge by weight.

24. The power charge of claim 15 wherein the first and second ignition portion are together 3.0% of the power charge by weight.

Assignees

• Hunting Titan Inc

Inventors

• Stovall Ty Edgar
• Smith Jeffrey Wayne
• Covalt Johnny
• Taylor Zachary James

Classifications

• F42D1/04 Primary

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

• 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

• E21B23/0414 Primary

  using explosives · CPC title

• F42D1/045

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

• E21B23/065

  setting tool actuated by explosion or gas generating means · CPC title