Calcium and magnesium hydroxide plugging process

Details Calcium and magnesium hydroxide plugging process Calcium and magnesium hydroxide plugging process

1974-01-28

1977-05-24

Purser, Ernest R.

Wells

Processes

Cementing, plugging or consolidating

E21B 4312, E21B 33138

Patent

active

040249174

ABSTRACT:
Channels in a water flood oil zone are plugged by injection of a hydroxide solution such as sodium hydroxide. The hydroxide solution is isolated from the connate water in the wellbore and vicinity of the wellbore by an isolation slug of water low in metallic ions which would react with the sodium hydroxide. Away from the wellbore where the isolation slug of water breaks down, the sodium hydroxide reacts with different metallic ions in the connate water such as magnesium and calcium to form precipitates of low solubility which will plug the water channels.

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patent: 3530937 (1970-09-01), Bernard
patent: 3658131 (1972-04-01), Biles
patent: 3837400 (1974-09-01), Martin

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