High energy severing tool with pressure balanced explosives
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
E21B-029/02
F42B-003/26
E21B-033/124
출원번호
US-0858816
(2015-09-18)
등록번호
US-9435170
(2016-09-06)
발명자
/ 주소
Bell, William T.
Rairigh, James G.
출원인 / 주소
Bell, William T.
인용정보
피인용 횟수 :
2인용 특허 :
16
초록▼
A high energy pipe severing tool is arranged to align a plurality of pressure balanced explosive pellets along a unitizing central tube that is selectively separable from a tubular external housing. The explosive pellets are loaded serially in a column and in full view along the entire column as a f
A high energy pipe severing tool is arranged to align a plurality of pressure balanced explosive pellets along a unitizing central tube that is selectively separable from a tubular external housing. The explosive pellets are loaded serially in a column and in full view along the entire column as a final charging task. Detonation boosters are pre-positioned and connected to detonation cord for simultaneous detonation at opposite ends of the explosive column. Devoid of high explosive pellets during transport, the assembly may be transported with all boosters and detonation cord connected.
대표청구항▼
1. An apparatus for severing a length of pipe comprising: a tubular housing having an internal bore and a plurality of bi-directional boosters;one or more vents in said tubular housing to substantially equalize fluid pressure within said internal bore with fluid pressure outside of said tubular hous
1. An apparatus for severing a length of pipe comprising: a tubular housing having an internal bore and a plurality of bi-directional boosters;one or more vents in said tubular housing to substantially equalize fluid pressure within said internal bore with fluid pressure outside of said tubular housing;a first detonation cord having a first length between a first bi-directional booster and a second bi-directional booster of said plurality of bi-directional boosters;a second detonation cord having a first length between a third bi-directional booster and a fourth bidirectional booster of said plurality of bi-directional boosters;a main load explosive material in said tubular housing located between said second bi-directional booster and said fourth bi-directional booster of said plurality of bi-directional boosters;a fluid impermeable material mixed with said main load explosive material; andan initiating booster explosive for simultaneously initiating said first bi-directional booster and said third bi-directional booster of said plurality of-bidirectional boosters. 2. The apparatus of claim 1, wherein said main load explosive material is pressed into a plurality of annular pellets. 3. The apparatus of claim 2, wherein said plurality of annular pellets are compressed to a pressure corresponding to an expected detonation environment pressure. 4. The apparatus of claim 2, wherein said tubular housing further comprises a tubular loading rod for penetrating a central aperture of said plurality of annular pellets. 5. The apparatus of claim 4, wherein said plurality of annular pellets are aligned along said tubular loading rod between said second bi-directional booster and said fourth bi-directional booster of the plurality of bi-directional boosters. 6. The apparatus of claim 1, wherein said fourth bi-directional booster of the plurality of bi-directional boosters is disposed within detonation proximity of said main load explosive material. 7. The apparatus of claim 4, wherein said tubular loading rod comprises a central bore, and wherein said first bi-directional booster and said second bi-directional booster of said plurality of bi-directional boosters are disposed within said central bore at respectively opposite ends of said first detonation cord. 8. The apparatus of claim 7, wherein said third bi-directional booster and said fourth bi-directional booster of said plurality of bi-directional boosters are disposed at respectively opposite ends of said second detonation cord. 9. The apparatus of claim 1, wherein an intermediate portion of said second detonation cord is located between said third bi-directional booster and said fourth bi-directional booster of the plurality of bi-directional boosters, and wherein said intermediate portion is wound about a timing spool. 10. The apparatus of claim 9, wherein said timing spool comprises a cylindrical body and a helical flute formed on the surface of said body about an axis thereof. 11. The apparatus of claim 4, further comprising a first end plug and a second end plug for enclosing said internal bore between opposite ends of the tubular housing. 12. The apparatus of claim 11, wherein the first end plug further comprises an initiating booster cavity, wherein said initiating booster cavity holds said initiating booster explosive. 13. The apparatus of claim 12, further comprising a first resilient bias positioned within said tubular loading rod between said second end plug and said second bi-directional booster of the plurality of bi-directional boosters. 14. The apparatus of claim 13, further comprising a second resilient bias positioned between said second end plug and said plurality of annular pellets. 15. The apparatus of claim 11, further comprising a firing head secured to said first end plug, wherein said firing head comprises a detonator disposed within detonation proximity of said initiating booster explosive. 16. The apparatus of claim 7, wherein said tubular loading rod comprises a structural wall about said central bore, and wherein said structural wall is penetrated by an aperture between said second bi-directional booster and a portion of said plurality of annular pellets. 17. A method of severing a pipe comprising the steps of: enclosing opposite ends of a tubular housing;venting said tubular housing to substantially equalize fluid pressure within said tubular housing to fluid pressure outside of said tubular housing;placing a first bi-directional booster, a second bi-directional booster, a third bi-directional booster, and a fourth bi-directional booster within said tubular housing;connecting a first detonation cord with a first length between said first bi-directional booster and said second bi-directional booster;connecting a second detonation cord with a first length between said third bi-directional booster and said fourth bi-directional booster;combining a main load explosive material and a fluid impermeable material into a mixture;loading said mixture into said tubular housing between said second bi-directional booster and said fourth bi-directional boosters;positioning said tubular housing and said mixture in a pipe; andsimultaneously initiating ignition of said second bi-directional booster and said fourth bi-directional booster. 18. The method of claim 17, further comprising the step of pressing said mixture into a plurality of annular pellets. 19. The method of claim 18, wherein the step of pressing said mixture further comprises compressing the plurality of annular pellets to a pressure corresponding to an expected detonation environment. 20. The method of claim 18, wherein the step of loading said mixture into said tubular housing further comprises aligning said plurality of annular pellets in a column between said second bi-directional booster and said fourth bi-directional booster of the plurality of bi-directional boosters. 21. The method of claim 18, further comprising the step of penetrating a central aperture of said plurality of annular pellets with a tubular loading rod. 22. The method of claim 21, wherein the step of placing said first bi-directional booster, said second bi-directional booster, said third bi-directional booster, and said fourth bi-directional booster of said plurality of bi-directional boosters further comprises placing said first bi-directional booster of said plurality of bi-directional boosters within one end of a central bore of said tubular loading rod and placing said second bi-directional booster of said plurality of bi-directional boosters within said central bore at an opposite end of said tubular loading rod. 23. The method of claim 22, wherein the step of placing said first bi-directional booster, said second bi-directional booster, said third bi-directional booster, and said fourth bi-directional booster of said plurality of bi-directional boosters further comprises placing said first bi-directional booster of the plurality of bi-directional boosters within detonation proximity of an initiating booster explosive. 24. The method of claim 23, wherein the step of placing said first bi-directional booster, said second bi-directional booster, said third bi-directional booster, and said fourth bi-directional booster of said plurality of bi-directional boosters further comprises placing said third bi-directional booster of the plurality of bi-directional boosters within detonation proximity of said initiating booster explosive. 25. The method of claim 24, wherein the step of connecting a second detonation cord further comprises wrapping said second detonation cord about a timing spool, and positioning opposite ends of said second detonation cord in detonation proximity of said third bi-directional booster and said fourth bi-directional booster of the plurality of bi-directional boosters. 26. An apparatus for severing a length of pipe comprising: a tubular housing having an internal bore and at least one vent, wherein said at least one vent equalizes fluid pressure within said internal bore with fluid pressure outside of said tubular housing;a first end cap on a first distal end of said tubular housing to close a first distal end of said internal bore, and a second end cap on a second distal end of said tubular housing to close a second distal end of said internal bore;a timing spool located within said tubular housing;a loading tube within said tubular housing connecting said first end cap and said second end cap through said timing spool, wherein said loading tube comprises a central bore therethrough;an initiating explosive booster located within said first end cap;a first bi-directional booster located within said central bore proximate to said first end cap;a second bi-directional booster located within said central bore proximate to said second end cap;a third bi-directional booster located within said internal bore and proximate to said timing spool;a first detonation cord having a first length between said first bi-directional booster and said second bi-directional booster;a second detonation cord having a first length between said third bi-directional booster and said initiating explosive booster; anda main load explosive material in said tubular housing located between said second end cap and said third bi-directional booster. 27. The apparatus of claim 26, wherein said second detonation cord is helically wound about said timing spool. 28. The apparatus of claim 26, wherein said second detonation cord connects to said initiating explosive booster through an aperture in said first end cap. 29. The apparatus of claim 26, wherein said main load explosive material is pressed into a plurality of annular pellets, and wherein said loading tube extends through said plurality of annular pellets. 30. The apparatus of claim 29, wherein said plurality of annular pellets are aligned along said loading tube between said second bi-directional booster and said third bi-directional booster.
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이 특허에 인용된 특허 (16)
Grattan,Antony F.; Patterson,Michael L.; Barker,James M.; Wuensche,Thomas J., Apparatus and method for severing pipe utilizing a multi-point initiation explosive device.
Welch Brendan M. ; Lucca Frank J. ; Toro Daniel A. ; Bahr Lyman G., Booster explosive devices and combinations thereof with explosive accessory charges.
Carisella James V. (7524 Garnet New Orleans LA 70124) Cook Robert B. (Mandeville LA), Methods and apparatus for disarming and arming well bore explosive tools.
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