Preferential solution mining process

Details Preferential solution mining process Preferential solution mining process

1975-09-23

1977-02-15

Purser, Ernest R.

Mining or in situ disintegration of hard material

In situ conversion of solid to fluid

Input and output wells

299 5, E21B 4328

Patent

active

040079643

ABSTRACT:
Disclosed is a method of preferentially solution mining potassium chloride from a stratified subterranean deposit of potassium chloride and sodium chloride where a plurality of strata are present in a single common solution mining cavity. According to an embodiment of the disclosed method, a first aqueous working solution is established in a lower zone of the cavity in contact with lower strata. Thereafter, a second aqueous working solution is established in contact with a higher zone intended to be preferentially mined. The second aqueous working solution is maintained at a lower specific gravity than the first aqueous working solution. Effluent is withdrawn from the second aqueous working solution near the lower boundary thereof and an extracting solution is added to the cavity at a rate sufficient to maintain the second aqueous working solution less dense than the subjacent solution, i.e., the first aqueous working solution. The disclosed method is useful in preferentially mining zones that have a potassium chloride content substantially different than adjacent zones.

REFERENCES:
patent: 2787455 (1957-04-01), Knappen
patent: 2976690 (1961-03-01), Allred et al.
patent: 3433530 (1969-03-01), Dahms et al.
patent: 3442553 (1969-05-01), Kutz
patent: 3914945 (1975-10-01), Bietlot

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