Subterranean cavity chimney development for connecting...

Details Subterranean cavity chimney development for connecting... Subterranean cavity chimney development for connecting...

E - Fixed Constructions

21

B

166/29

E21B 43/28 (2006.01)

Patent

CA 1129765

ABSTRACT OF THE DISCLOSURE Disclosed is a method of connecting two or more subterranean cavities in a deposit having a potassium chloride-rich stratum which contains sodium chloride and which is disposed above a potassium chloride- lean, sodium chloride-rich stratum. The method comprises drilling at least two adjacent wells into the sodium chloride-rich stratum, establishing a chimney filled with insulating fluid at the bottom of each of the wells, extracting ore from the potassium chloride-lean stratum with solvent, raising the roof of the cavities by incrementally raising the insulating fluid level and allowing the cavities to grow laterally until the cavities connect.

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