Plasma drill bit with bundling impact nozzle and well drilling method

Abstract

The invention discloses a plasma drill bit with a bundling impact nozzle and a well drilling method, and belongs to the technical field of well drilling engineering. The drill bit body comprises a drill bit shell, an anode electrode is coaxially arranged on the inner side of the drill bit shell, an annular runner is formed between the drill bit shell and the anode electrode, and a cluster impact nozzle is arranged at the bottom end of the drill bit shell. A discharge chamber is arranged in the middle of the anode electrode; the anode base is arranged at the top end of the anode electrode, the inner side of the anode base is in insulated connection with the cathode base, and the cathode electrode is arranged at the lower end of the cathode base; a high-pressure medium runner is arranged on the anode base, and the top end of the high-pressure medium runner is connected with a high-pressure medium pipe; a spiral groove is formed in the outer side wall of the cathode base, a working medium pipe communicated to the spiral groove is arranged at the upper end of the cathode base, and a gas film hole is formed in the anode electrode. When high-pressure gas is introduced, plasma jet flows spin along with vortexes, the spraying area is increased, and the diameter of a generated crushing pit can meet the entering requirement of a drill bit.

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