[특허]Repetitive pulsed electric discharge apparatuses and methods of use

[미국특허] Repetitive pulsed electric discharge apparatuses and methods of use 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	E21B-017/00 E21B-007/15
출원번호	US-0743664 (2015-06-18)
등록번호	US-10060195 (2018-08-28)
발명자 / 주소	Moeny, William M.
출원인 / 주소	SDG LLC
대리인 / 주소	Peacock Law P.C.
인용정보	피인용 횟수 : 0 인용 특허 : 89

초록 ▼

Electrocrushing drill bits comprising one or more high voltage electrodes surrounded by a ground or current return structure, which can be a ring or a comprise rod shaped (i.e. cylindrical) electrodes. Openings in the rim of the current return structure facilitate removal of drilling debris and bubbles created by the electrocrushing process out from the bottom face of the bit and up the wellbore. The high voltage electrodes can be arranged in a circle. The current return structure may partially cover the bottom face of the drill bit, thereby enclosing the high voltage electrodes in openings that may be sector shaped. Also a method and apparatus for dividing a flow of drilling fluid both to sweep drilling debris and bubbles out of the drill bit and hole and to cool high power electrical components.

대표청구항 ▼

1. An electrocrushing drill bit comprising a plurality of cylindrical high voltage electrodes arranged in at least a portion of a circle and surrounded by a current return structure comprising a plurality of circumferential openings for facilitating removal of drilling debris from said drill bit, wherein said high voltage electrodes surround one or more cylindrical central current return electrodes. 2. The drill bit of claim 1 comprising a plurality of said one or more central current return electrodes arranged in at least a portion of a circle concentric with said high voltage electrodes. 3. The drill bit of claim 1 wherein said current return structure comprises a current return ring. 4. The drill bit of claim 1 wherein said current return structure comprises a plurality of cylindrical circumferential current return electrodes located at an outer rim of said drill bit and said circumferential openings comprise spaces between said circumferential current return electrodes. 5. The drill bit of claim 4 wherein said circumferential current return electrodes are concentric with said plurality of cylindrical high voltage electrodes. 6. The drill bit of claim 4 further comprising a wall connecting said circumferential current return electrodes, said wall thinner than a diameter of each said circumferential current return electrode and disposed so that said wall extends radially outwardly as far as an outermost point of said circumferential current return electrode, thereby longitudinally extending an outer wall of the drill bit, but does not extend radially inwardly past said circumferential current return electrodes. 7. The drill bit of claim 6 wherein a height of said wall is shorter than a length of said circumferential current return electrodes. 8. The drill bit of claim 6 wherein said wall and said circumferential current return electrodes are manufactured together to form a single structure. 9. The drill bit of claim 6 wherein said wall comprises a plurality of additional openings to facilitate removal of drilling debris from the drill bit. 10. The drill bit of claim 4 wherein said high voltage electrodes comprise a cross-sectional shape selected from the group consisting of circle, ellipse, and airfoil. 11. The drill bit of claim 1 comprising a single said central current return electrode located approximately at a center of said circle. 12. The drill bit of claim 1 comprising a plurality of channels running longitudinally along an outer surface of said drill bit to facilitate transport of drilling debris up and out of a drilling hole. 13. The drill bit of claim 1 connected to a bottom hole assembly via a rotational joint and a motor for nutating said drill bit. 14. An electrocrushing drill bit comprising one or more high voltage electrodes surrounded by a current return structure comprising a plurality of circumferential openings for facilitating removal of drilling debris from said drill bit; wherein said current return structure partially covers a bottom face of said drill bit, said current return structure comprising one or more bottom openings along said bottom face, wherein one or more of said high voltage electrodes is disposed within each said bottom opening. 15. The drill bit of claim 14 further comprising an channel at approximately a center of said bottom face for flowing drilling fluid into said bit. 16. The drill bit of claim 15 wherein said current return structure comprises a solid portion disposed near said channel, thereby forcing at least some of the flowing drilling fluid to flow radially from said channel toward and around each said high voltage electrode. 17. The drill bit of claim 15 wherein the flowing drilling fluid sweeps drilling debris and bubbles in said fluid created by operation of said electrodes out of said drill bit. 18. The drill bit of claim 14 wherein said high voltage electrodes are cylindrical. 19. The drill bit of claim 18 wherein the high voltage electrodes are arranged to form at least a portion of a circle centered on a center of said bottom face. 20. The drill bit of claim 14 wherein each said high voltage electrode is compressible and/or extends out from said bottom face. 21. The drill bit of claim 14 wherein two or more of said high voltage electrodes are electrically connected to form one or more sets of connected electrodes, each set powered by a separate pulsed power system. 22. The drill bit of claim 21 wherein preferred operation of one or more of said sets over one or more other of said sets results in directional control of said drill bit. 23. The drill bit of claim 21 wherein electrodes in each set are mechanically linked to move together. 24. The drill bit of claim 14 wherein each said bottom opening is sector-shaped or substantially triangular. 25. The drill bit of claim 24 wherein said high voltage electrodes are substantially triangular or sector shaped and are circumferentially arranged around a center of said bottom face, each high voltage electrode oriented so that one vertex of each high voltage electrode is pointing toward said center. 26. The drill bit of claim 14 connected to a bottom hole assembly via a rotational joint and a motor for nutating said drill bit. 27. The drill bit of claim 26 wherein said motor nutates said drill bit to provide more uniform drilling despite non-uniform electric field distributions produced by said high voltage electrodes. 28. An electrocrushing drill bit comprising a single central high voltage electrode surrounded by a plurality of cylindrical circumferential current return electrodes located at an outer rim of said drill bit; wherein spaces between said circumferential current return electrodes facilitate removal of drilling debris from said drill bit. 29. The drill bit of claim 28 connected to a bottom hole assembly via a rotational joint and a motor for nutating said drill bit. 30. The drill bit of claim 28 further comprising a wall connecting said circumferential current return electrodes, said wall thinner than a diameter of each said circumferential current return electrode and disposed so that said wall extends radially outwardly as far as an outermost point of said circumferential current return electrode, thereby longitudinally extending an outer wall of the drill bit, but does not extend radially inwardly past said circumferential current return electrodes. 31. The drill bit of claim 30 wherein a height of said wall is shorter than a length of said circumferential current return electrodes. 32. The drill bit of claim 30 wherein said wall and said circumferential current return electrodes are manufactured together to form a single structure. 33. The drill bit of claim 30 wherein said wall comprises a plurality of additional openings to facilitate removal of drilling debris from the drill bit.

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[미국특허] Repetitive pulsed electric discharge apparatuses and methods of use 원문보기

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