China University of Petroleum

Xinlei Wu

Yonghong Liu

Peng Liu

Baoping Cai

Renjie Ji

Qingyun Li

Xiaopeng Li

Qiang Sun

Yancong Han

Hang Dong

Fan Zhang

Dege Li

A multi-path combined high-low voltage plasma drilling method, a drill bit for drilling and a drill bit apparatus for drilling utilizing this method. The drilling method includes: disposing a plurality of mutually independent plasma generators on a plasma drill bit, wherein the plasma generators are independently connected to a plasma power source on the ground through wires; allowing each of the plasma generators to eject high-frequency pulsed plasma arc under the control of its corresponding combined high-low voltage pulse power source on the ground; ejecting the high-frequency pulsed plasma arc onto a wall of a drilling well, forming impulsive high temperature thermal shock stress inside the rocks on the wall of the drilling well; and breaking the rocks under the shock of thermal stress to form rock debris.

Multi-path combined high-low voltage plasma drilling method, drill bit for drilling and drill bit apparatus for drilling

An embodiment of the present disclosure provides a multi-path combined high-low voltage plasma drilling power source and drilling system. The multi-path combined high-low voltage plasma drilling power source comprises a high-voltage DC circuit, low-voltage DC circuits, high-voltage breakdown modules and an upper computer; wherein the high-voltage DC circuit is connected with the low-voltage DC circuits through cables; the low-voltage DC circuits and the high-voltage breakdown modules simultaneously supply power to plasma generators through cables; the upper computer monitors the low-voltage DC circuits in real time; and the same power source comprises a plurality of low-voltage DC circuits and high-voltage breakdown modules.

Multi-path combined high-low voltage plasma drilling power source and drillling system

The present disclosure provides a multi-path combined high-low voltage plasma rock-breaking drill bit, drill bit apparatus and drilling method. The multi-path combined high-low voltage plasma rock-breaking drill bit comprises: a drill bit body, insulators, plasma generators, drilling fluid outlets, plasma integrated pipelines, a drilling fluid pipe; wherein a plurality of plasma generators are distributed on the same drill bit body; the axis of the plasma generator and the axis of the drill bit body form a certain included angle; each of the plasma generators is independently connected to the ground through its respective plasma integrated pipeline and operates independently; and drilling fluid flows out of the drilling fluid outlets, takes away the heat generated by the operation of the plasma generators, thereby cooling the plasma generators.

Multi-path combined high-low voltage plasma rock-breaking drill bit, drill bit apparatus and drilling method

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Shandong, China

Xinlei Wu