Method for in situ minefields

Details Method for in situ minefields Method for in situ minefields

1977-12-23

1978-11-14

Purser, Ernest R.

Mining or in situ disintegration of hard material

In situ conversion of solid to fluid

Input and output wells

166 57, 166302, 166DIG1, E21B 4300

Patent

active

041252896

ABSTRACT:
A circulation tubing string is disposed about the lixiviant return tubing string in the production hole of an in situ minefield. The circulation string extends from the surface to a point near a packer which defines the top of the leaching interval. A fluid coupler provides a fluid flow path between the annular cross-section regions between the production hole casing and the circulation string, and between the circulation string and the lixiviant return string. A flow of cooling fluid is maintained from the surface through the circuital path defined by the annular cross-section regions and the fluid coupler, particularly including the exterior surface of the production tubing string. The fluid is maintained at a temperature and flow rate so that the pregnant leach liquor flows in the production tubing string between the leaching interval and the surface is characterized by a predetermined temperature drop.

REFERENCES:
patent: 556651 (1896-03-01), Van Dyke
patent: 1012777 (1911-12-01), Wigle
patent: 3007523 (1961-11-01), Vincent
patent: 3130789 (1964-04-01), Alexander et al.
patent: 3160208 (1964-12-01), Jorda
patent: 3841705 (1974-10-01), Girard

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