초록 ▼

A borehole mining tool comprising a drill string having an inner pipe column and an outer pipe column. Water is forced under high pressure down an annulus between the outer pipe and inner pipe. A hydromonitor is attached to the end of the drill string. A nozzle in the hydromonitor directs the pressu

A borehole mining tool comprising a drill string having an inner pipe column and an outer pipe column. Water is forced under high pressure down an annulus between the outer pipe and inner pipe. A hydromonitor is attached to the end of the drill string. A nozzle in the hydromonitor directs the pressurized water into a stope or work area, thereby loosening the material to be mined. The slurry is educted from the mined area by the action of a venturi attached downstream of the hydromonitor. Water flow through the venturi creates a vacuum which draws the pregnant slurry from the work area up through the inner pipe to the surface. A plurality of tools may be attached to the hydromonitor by a connection comprising a gasket having an interference fit. The gasket allows quick connection and removal of a plurality of tools from the hydromonitor. A radar is include to provide an image of the stope being worked.

대표청구항 ▼

1. A borehole mining tool comprising a top head protruding from a borehole, a bottom head, and an intermediate section;said tool consisting of at least two mainly coaxial pipe strings, one of which is an outer pipe column and the second is an inner pipe column, said pipe strings thereby describing:

1. A borehole mining tool comprising a top head protruding from a borehole, a bottom head, and an intermediate section;said tool consisting of at least two mainly coaxial pipe strings, one of which is an outer pipe column and the second is an inner pipe column, said pipe strings thereby describing: an inner channel, located inside the inner pipe column and an annulus gap channel, described by the annulus between the outer pipe and the inner pipe, said two coaxial pipe strings thereby describing a dual pipe column having dual pipe column sections, allowing extension of said tool to the required depth of a borehole, said bottom head comprising a hydromonitor section and an eductor section; said hydromonitor section having a hydromonitor with a nozzle hydraulically communicating with said annulus and said tool exterior, such that a stream of fluid from said annulus is ejected from said nozzle at substantially a right angle to a centerline of said tool to said exterior; said eductor section comprising an eductor nozzle, venturi pipe with an inlet, called confuser and an outlet, called diffuser and a slurry intake port hydraulically communicating with said exterior, wherein the eductor nozzle is either a ring-type nozzle or central-type nozzle, such that said eductor nozzle hydraulically communicates with said gap channel, said venturi pipe hydraulically communicating with said eductor nozzle and said slurry intake port by said confuser, and also said venturi pipe communicating with said tool inner pipe column by said diffuser, said venturi receiving a fluid flow from said eductor nozzle creating a vacuum, whereby a fluid external to said tool is drawn into said venturi and further to said inner column; and said eductor nozzle is connected to said venturi by a dual pipe connector.