Mining or in situ disintegration of hard material – Processes – Breaking down by direct contact with fluid
Patent
1982-08-18
1984-04-03
Purser, Ernest R.
Mining or in situ disintegration of hard material
Processes
Breaking down by direct contact with fluid
175 67, 175213, 137119, E21C 4500
Patent
active
044404506
ABSTRACT:
A method of drilling and mining a subterranean ore deposit with a tool string having a drill bit and a combined mining nozzle and eductor section with the fluid flow being controlled to each valve by self-activating valves. Controlling the operation of the downhole valves by the pressure of the fluid pumped into the tool string.
An apparatus is provided for actuating down-hole flow control valves in a borehole mining tool to change the tool function from drilling to mining while still in the borehole. Single or double-acting power cylinders are employed as actuators with the system pump pressure applied to one side of the piston while a resilient spring and pneumatic pressure are applied to the other side of the piston. The spring and pneumatic pressure provide sufficient force to maintain the actuator in the drilling mode during the application of drilling pressure while mining system pressure overcomes these forces and actuates the flow control valves.
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Coakley John E.
Purser Ernest R.
Slurry Mining Engineering Inc.
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