Well repair for in situ leaching

Details Well repair for in situ leaching Well repair for in situ leaching

1981-02-23

1983-06-07

Purser, Ernest R.

Mining or in situ disintegration of hard material

In situ conversion of solid to fluid

Dissolving or chemical reaction

166295, 405264, E21B 4328

Patent

active

043868061

ABSTRACT:
A permeable region adjacent a well bore used in an acidic in situ leaching system can be repaired by introducing a non-acidic liquid for displacing acidic leach liquid from the permeable region, introducing into the well bore a basic composition including a polymeric material that gels under acidic conditions, and applying sufficient pressure to the well bore to displace at least a portion of the basic composition and polymeric material from the well bore into the permeable region adjacent the well bore. Liquid flow in the well bore is then discontinued for a sufficient time for acid remaining in the subterranean formation adjacent the well bore to contact such polymeric material and cause gelation of the polymeric material in the permeable region. The introduction of acidic leach liquid can then continue.

REFERENCES:
patent: 3583167 (1971-06-01), Parks
patent: 3733833 (1973-05-01), Parks
patent: 3795276 (1974-03-01), Eilers et al.
patent: 3967681 (1976-07-01), Curzon
patent: 4018286 (1977-04-01), Gall et al.
patent: 4091868 (1978-05-01), Kozlowski et al.
Brochure re Dowell Additive M-174, Dowell Division of the Dow Chemical Company, Tulsa, Okla. 74102.

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