| 摘要 |
An improved drill section and method of hydraulically mining mineral deposits which includes plural flow conduits extending through the drill section, having complimentary shaped tapered thread sections at opposite ends thereof, is disclosed. The tapered thread sections distribute and accommodate high tortional forces and ensure registered alignment of the flow conduits. Seals are provided at the interface between the multiple drill sections which simultaneously seal each of the flow conduits positioned within the interior of the drill sections. The outer casing of the drill section permits the introduction of high pressure fluid and includes a plurality of pressure-responsive plugs adapted to rupture at a predetermined pressure value thereby releasing fluid to lubricate the drill string and reduce the torque encountered during the mining operation.
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