[특허]Method and apparatus for generating high-pressure pulses in a subterranean dielectric medium

[미국특허] Method and apparatus for generating high-pressure pulses in a subterranean dielectric medium 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	E21B-043/26 E21B-028/00
출원번호	US-0208525 (2014-03-13)
등록번호	US-10077644 (2018-09-18)
발명자 / 주소	Storslett, Stein J. Spielman, Rick B.
출원인 / 주소	CHEVRON U.S.A. INC.
인용정보	피인용 횟수 : 0 인용 특허 : 100

초록 ▼

An apparatus and method for generating high-pressure pulses in a subterranean dielectric medium are provided. The method includes providing an electrode assembly in the medium, the electrode assembly having first and second electrodes that define a gap therebetween. A shaped electric current pulse is delivered to the electrode assembly. The electric current pulse has a duration greater than 100 μs so that an electric arc is formed between the first and second electrodes, thereby producing a pressure pulse in the medium.

대표청구항 ▼

1. A method for generating high-pressure pulses in a subterranean dielectric medium, the method comprising: providing an electrode assembly in the dielectric medium, the electrode assembly having an assembly housing, the electrode assembly further having a first electrode positioned within and supported by the assembly housing and having a second electrode positioned within the assembly housing, wherein the first and second electrodes of the electrode assembly are arranged in a radial configuration, with the first electrode disposed radially within a ring defined by the second electrode, and a radial gap between the first and second electrodes, wherein the first electrode and the second electrode have a cylindrical shape, and wherein at least one of the first electrode and the second electrode have an axial length of at least 10 millimeters; anddelivering a shaped electric current pulse from a pulser to the electrode assembly, the electric current pulse having a duration greater than 100 μs and maintaining a substantially constant current during the duration of the electric current pulse, such that an electric arc is formed between the first and second electrodes, and thereby producing a pressure pulse in the dielectric medium, wherein the pulser further comprises a pulse-forming network including a plurality of capacitors arranged in parallel and a plurality of inductors arranged in series. 2. The method of claim 1 further comprising, prior to the step of delivering the electric current pulse, delivering a fluid to the dielectric medium to increase the pressure of the medium to at least 5 bars. 3. The method of claim 1 wherein the step of delivering the electric current pulse comprises forming the electric arc through the dielectric medium comprising a fluid that is at least partially saturated with a gas comprised of at least one of the group consisting of ammonia, sulfur dioxide, and carbon dioxide, such that at least some of the gas in the fluid of the dielectric medium is released during the production of the pressure pulse. 4. The method of claim 1 wherein the step of delivering the electric current pulse comprises delivering a voltage between 10 kV and 30 kV to the electrode assembly. 5. The method of claim 1 wherein the step of delivering the electric current pulse comprises delivering a current of at least 5 kA for the electric current pulse duration. 6. The method of claim 1 wherein the duration of the electric current pulse is between 200 μs and 4 ms. 7. The method of claim 1 wherein the dielectric medium comprises at least one of the group consisting of water, saline water, oil, or drilling mud. 8. The method of claim 1 wherein the step of delivering the electric current pulse comprises delivering at least 50 kJ of energy to the electrode assembly during the electric current pulse duration. 9. The method of claim 1 wherein the step of delivering the electric current pulse and producing the pressure pulse in the medium comprises producing a pressure of at least 1 kbar for a duration of at least 10 milliseconds in the medium. 10. The method of claim 1 further comprising repeating the step of delivering the electric current pulse to the electrode assembly at a frequency of at least 1 Hz. 11. The method of claim 1 wherein each electrode having a thickness between 0.2 cm and 2.5 cm and the radial gap between the first and second electrodes being between 0.5 cm and 4 cm. 12. An apparatus for generating high-pressure pulses in a subterranean dielectric medium, the apparatus comprising: an electrode assembly configured to be disposed in the dielectric medium, the electrode assembly having an assembly housing, the electrode assembly further having a first electrode positioned within and supported by the assembly housing and having a second electrode positioned within the assembly housing, wherein the first and second electrodes of the electrode assembly are arranged in a radial configuration, with the first electrode disposed radially within a ring defined by the second electrode, and a radial gap between the first and second electrodes, wherein the first electrode and the second electrode have a cylindrical shape, and wherein at least one of the first electrode and the second electrode have an axial length of at least 10 millimeters; anda pulser configured to deliver a shaped electric current pulse to the electrode assembly, the electric current pulse having a duration greater than 100 μs and maintaining a substantially constant current during the duration of the electric current pulse, to form an electric arc between the first and second electrodes and thereby produce a pressure pulse in the dielectric medium, wherein the pulser further comprises a pulse-forming network including a plurality of capacitors arranged in parallel and a plurality of inductors arranged in series. 13. The apparatus of claim 12 further comprising a pressure device configured to deliver a flow of fluid to the medium to increase the pressure of the dielectric medium to at least 5 bars. 14. The apparatus of claim 12 wherein the pulser is configured to deliver the electric current pulse at a voltage between 10 kV and 30 kV. 15. The apparatus of claim 12 wherein the pulser is configured to deliver the electric current pulse at a current of at least 5 kA. 16. The apparatus of claim 12 wherein the duration of the electric current pulse is between 200 μs and 4 ms. 17. The apparatus of claim 12 wherein the pulser is configured to deliver at least 50 kJ of energy to the electrode assembly during the electric current pulse duration. 18. The apparatus of claim 12 wherein each electrode having a thickness between 0.2 cm and 2.5 cm and the radial gap between the first and second electrodes being between 0.5 cm and 4 cm. 19. The apparatus of claim 12 wherein the pulser is configured to deliver a plurality of electric current pulses to the electrode assembly at a frequency of at least 1 Hz. 20. The apparatus of claim 12 wherein the pulser comprises a solid-state electrical switch configured to deliver the electric current pulse to the electrode assembly. 21. The apparatus of claim 12 wherein the pulser comprises a gas-based electrical switch to deliver the electric current pulse to the electrode assembly. 22. The apparatus of claim 12 in which the pulser comprises an inductive pulse-forming network and an opening switch configured to deliver the electric current pulse to the electrode assembly.

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[미국특허] Method and apparatus for generating high-pressure pulses in a subterranean dielectric medium 원문보기

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