Title:
放電パルスによる掘削のための方法、掘削機、ドリルビット、および穴底面組立体
Document Type and Number:
Japanese Patent JP4703571
Kind Code:
B2
Abstract:
Machine for ground drilling, with a circulating fluid, by the utilization of electric discharge generated by high-voltage pulses between electrodes. It may comprise: —A drill-bit 1 with electrodes movable relative to each other, so that bottom-hole physical contact be secured for all the electrodes 4 on all bottom-hole topographies. —Pointed hydraulic nozzles for jetting the fluid, to remove primary cuttings and with pressure expansion across the nozzles 7 at no less than 4 MPa. —A high-voltage pulse generator deployed down-hole at a minimum distance from the drill-bit 1. —A rotating or oscillating bit causing the borehole cross-sectional excavation to occur, and electric discharge between a plurality of electrodes situated on the bit face along one or a few radii and tangents. —A bottom hole assembly for annular hole-making with core storage, transportation, down-hole closed loop discharge fluid circulation. A discharge fluid storage may be incorporated. A drilling method is also described.
Inventors:
Roadland, Arid
Lopatin, Vladimir.
Muratov, Vasili, M.
Vajov, Valdislavev.
Lopatin, Vladimir.
Muratov, Vasili, M.
Vajov, Valdislavev.
Application Number:
JP2006541069A
Publication Date:
June 15, 2011
Filing Date:
November 30, 2004
Export Citation:
Assignee:
Yuno Drill Aes
International Classes:
E21B7/15; E21B10/60
Domestic Patent References:
| JP9119283A | ||||
| JP48013202A |
Foreign References:
| US6164388 |
Attorney, Agent or Firm:
Kazunori Saito
Tetsuya Ito
Tetsuya Ito