| 摘要 |
A drill bit with a housing and roller cones has a high-speed fluid jet erosion system utilizing dual discharge, high-velocity, jet streams that is directed at the surface to be eroded. The jet streams are developed from a dual discharge nozzle adapted to form a first, swirling liquid jet and a second, axial liquid jet in combination therewith. When used in a shale-like formation, the bit includes a nozzle in a bowl area of the housing that sends a vortex shaped spray against the roller cones.
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